Introduction
Physics Capsule RRB SSC JE Important Quiz questions. These Chapter questions are also useful for Science and Technology, Basic Physics Notes, RRB JE Mechanical Syllabus for CBT 2, and SSC CPO Exams. This Practice Test Paper gives provident strategy. The Practice Quiz Questions are given below. All these questions are the easily understandable format. Physics is a very important subject for Railway Recruitment exams and SSC JE Exams.
Quiz
Q1. Diode is used for
Answer: Purification
Q2. Who developed the technology of underground nuclear explosion ?
Answer: Dr. Horn J. Bhabha
Q3. _______ coal produces most heat per unit.
Answer: Anthracite
Q4. _______ is used for communication by artificial satellites.
Answer: Microwaves
Q5. What is found in frequency modulation?
Answer: Fixed Frequency
Q6. The force of attraction between an electron revolving around the nucleus and the nucleus is a _______force?
Answer: Electric
Q7. What is the distance between a crest and a consecutive trough in a transverse wave?
Answer: Half of the wavelength
Q8. ______ is indicated by the colour of a star.
Answer: Temperature
Q9. Action and reaction _______?
Answer: are equal in magnitude
Q10. The working principle of a mercury thermometer is _______.
Answer: Expansion of matter on heating
Q11. When the speed of a moving object is halved, its ________.
Answer: Kinetic energy becomes 1/4 of the original
Q12. When an object is kept between two parallel plane mirrors then what is the number of images formed?
Answer: Infinite
Q13. ___ is the change in velocity per unit time.
Answer: Acceleration
Q14. Which physical quantities have only magnitude and no direction?
Answer: Scalar Quantities
Q15. Which physical quantities have magnitude and direction both and obey triangle law?
Answer: Vector Quantities
Q16. The length of actual path covered by a moving object in a given time interval is known as _____.
Answer: Distance
Q17. ______ is used to measure Soil Water Tension?
Answer: Tensiometer
Q18. What is the SI unit of Force?
Answer: Newton
Q19. Which device is best suited for measuring the temperature inside metallurgical furnaces?
Answer: Pyrometer
Q20. _______ is the property of a material to conduct heat.
Answer: Thermal Conductivity
Q1. Who invented first working laser?
Answer: T.H. Maiman
Q2. What is the minimum distance (in metres) required to hear an echo?
Answer: 17 metres
Q3. Why does a blackboard appears black in colour?
Answer: It absorbs all the colours
Q4. Meter in a vehicle that calculates distance covered by the vehicle is called
Answer: Odometer
Q5. What is the SI unit of pressure?
Answer: Pascal
Q6. _______ is the SI unit of magnetic flux.
Answer: Weber
Q7. Who invented bluetooth?
Answer: Dr. Jaap Haartsen
Q8. Reflection from a smooth surface like that of a mirror is called _____ reflection.
Answer: Regular
Q9. What is the SI unit of resistance?
Answer: ohm
Q10. Vacuum pump was invented by ______.
Answer: Otto von Guericke
Q11. What is the other name of Galileo's law of falling bodies?
Answer: Newton's first law
Q12. Which device is used to measure humidity?
Answer: Hygrometer
Q13. At what temperature pure water freezes?
Answer: 32 degree Fahrenheit = 0 degree celsius = 273.15 Kelvin
Q14. Who invented Dynamite?
Answer: Alfred Nobel
Q15. The phenomena of raising the outer edge of the curved roads above the inner edge to provide necessary centripetal force to the vehicles to take a safe turn is called_____.
Answer: Banking of roads
Q16. The bending of light when it passes around a corner or a slit is due to _____.
Answer: Diffraction
Q17. What is the reason for formation of Mirage in desert?
Answer: Total Internal Reflection of Light
Q18. Who discovered television?
Answer: John Baird
Q19. It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
Answer: Newton's third law
Q20. Electromagnetic waves do not show interference and ______ .
Answer: Diffraction
Q1. Who invented Microscope?
Answer: Zacharias Jansen
Q2. Convex mirror is generally used in _____.
Answer: Rear view mirror
Q3. What is the SI unit of Frequency?
Answer: Hertz
Q4. Speed of light is maximum in _____.
Answer: Vacuum
Q5. _____ is the SI unit of electric current.
Answer: Ampere
Q6. If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
Answer: Concave
Q7. Soap bubble attains spherical shape due to _____.
Answer: Surface Tension
Q8. Who invented safety lamp?
Answer: Sir Humphry Davy
Q9. Why does water tank appear shallower when viewed from the top?
Answer: Due to refraction
Q10. Which colour is formed when Red and Green are mixed?
Answer: Yellow
Q11. At which place, weight of an object is maximum?
Answer: At poles
Q12. What is the SI unit of temperature?
Answer: Kelvin
Q13. Electric motor converts _____ energy to mechanical energy.
Answer: Electrical
Q14. Optical fibre works on which principle?
Answer: Total Internal Reflection
Q15. Who invented Pentium Chip?
Answer: Vinod Dham
Q16. ______ determines the pitch of a sound.
Answer: Frequency
Q17. Which phenomena shows the particle nature of light?
Answer: Photoelectric Effect
Q18. Who pioneered diagnostic ultrasound?
Answer: Ian Donald
Q19. What is the SI unit of Intesnity of Sound?
Answer: Decible
Q20. Which colour is formed when Blue and Green are mixed?
Answer: Cyan
Q1. What was invented by J.B. Dunlop?
Answer: Car
Q2. When a ball is thrown vertically upwards, what remains constant during its motion?
Answer: Energy
Q3. What is the SI unit of heat energy?
Answer: Joule
Q4. Who invented the Centigrade law?
Answer: Anders Celsius
Q5. On which principle does the hydraulic lift works?
Answer: Pascal's Law
Q6. At what temperature , the numerical values on Celsius and Fahrenheit scales become equal?
Answer: -40 degree celsius
Q7. ______ causes fly ash.
Answer: Coal Combustion Power Plant
Q8. Who devleloped the theory of relativity?
Answer: Albert Einstein
Q9. What is the SI unit of power?
Answer: Watt
Q10. Supercooling is the cooling of liquid _____
Answer: below freezing point
Q11. When light passes from one medium to another, this phenomenon of change in its direction is called _____.
Answer: Refraction
Q12. Who invented Radar
Answer: A.H. Taylor and Leo C. Young
Q13. The sliding friction is _____ than the static friction.
Answer: Less
Q14. In science a push or pull of an object is called______.
Answer: Force
Q15. Who discovered colour photography?
Answer: James Clerk Maxwell
Q16. In a qualitative way, the tendency of undisturbed objects to stay at rest or to keep mooving with the same velocity is called_____.
Answer: Inertia
Q17. Who invented the electric tram?
Answer: Fyodor Pirotsky
Q18. If the speed of an object moving along a straight line is constant , its motion is said to be _____.
Answer: Uniform Motion
Q19. The strength of a force is usually expressed by its ______.
Answer: Magnitude
Q20. In the formula of average velocity = (u+v)/2, u is____
Answer: Initial Velocity
Q1. If the speed of an object moving along a straight line keep changing, its motion is said to be ______.
Answer: Non-uniform motion
Q2. The substances which reduce friction are called_____.
Answer: Lubricants
Q3. What is the unit of calorific value?
Answer: kJ/kg
Q4. Who invented Space Pen?
Answer: Paul C. Fisher
Q5. If the force applied on the object is in the direction opoosite to the direction of motion, the speed of the object_____.
Answer: Decreases
Q6. What is the SI unit of acceleration?
Answer: m/sec 2
Q7. Who discovered photon
Answer: Albert Einstein
Q8. Contact force is another name for _______.
Answer: Muscular Force
Q9. The force of friction between two surfaces will increase if
Answer: The two surfaces are pressed harder
Q10. The property of metal by which it can be drawn into wires is called______.
Answer: Ductility
Q11. An image formed by a plane mirror, that cannot be obtained on a screen is called?
Answer: Virtual Image
Q12. The force exerted by a magnet is an example of_____.
Answer: Non-contact force
Q13. According to the Second Law of motion , for a given force, , acceleration is inversel proportional to the _____ of an object.
Answer: Mass
Q14. The coil wire in the electric room heater or electric cooking heater is called_______.
Answer: Element
Q15. Energy in the form of heat is wasted when a machine is operated. This heat is generated due to ______.
Answer: friction
Q16. The incident ray, the _____ at the point of incidence and the reflected ray all lie in the same plane.
Answer: Normal
Q17. Who invented Velcro?
Answer: George de Mestral
Q18. During uniform motion of an object along a straight line, the ______ remains constant with time.
Answer: Veocity
Q19. The impression of an image persists on the retina for about _____ of a second.
Answer: 1/16th
Q20. The distance- time graph for the motion of an object moving with a constant speed is a ______.
Answer: Straight line
Q1. Who invented the waterproof raincoat?
Answer: Charles Macintosh
Q2. If an object moves in a circular path with uniform _____, its motion is called uniform circular motion.
Answer: Speed
Q3. The reflection formed by the plane mirror is ______.
Answer: lateral inversion
Q4. The frictional force exerted by fluids is also called_____.
Answer: Drag
Q5. Who discovered electricity and invented the lightning rod and bifocals?
Answer: Benjamin Franklin
Q6. The property of metals by which they can be beaten into thin sheets is called ______.
Answer: Malleability
Q7. If the force applied on the object is in the direction of its motion, the speed of the object_____.
Answer: Increases
Q8. Friction is caused by the _______ on the two surfaces in contact.
Answer: Irregularities
Q9. The motion of a freely falling body is an example of _____motion.
Answer: uniformly accelerated
Q10. Who invented the hot air balloon?
Answer: Montgolfier Brothers
Q11. A ball rolling along the ground gradually slows down and finally comes to rest is due to _______.
Answer: Friction
Q12. The angle between the ______ and the incident ray is called the angle of incidence.
Answer: normal
Q13. Who invented the thermos flask?
Answer: James Dewar
Q14. For an object, the state of rest is considerd to be the state of ______ speed.
Answer: Zero
Q15. The laws which governs the motion of planets are called_______.
Answer: Kepler's Laws
Q16. The gravitational force is maximum at ______.
Answer: poles
Q17. First law of thermodynamic is normally related to _____.
Answer: Law of conservation of energy
Q18. White clothes are cooler than black because ______.
Answer: they reflects the whole light
Q19. Earth is a _____ absorber and _____ radiator of heat.
Answer: bad
Q20. Radian per second is unit of
Answer: Angular Velocity
Q1. A _______ is an electromechanical instrument for detecting and measuring electric current.
Answer: Galvanometer
Q2. The energy gap of diamond is
Answer: 5.47 eV
Q3. At boiling point of liquids, its ______.
Answer: Temperature remains constant
Q4. On a ocean glass plate, a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because_______
Answer: Cohesion of mercury is greater than its adhesion with glass
Q5. Bubbles of air rise up through liquids due to ______
Answer: Viscosity and buoyancy
Q6. The boiling point of liquids vary as
Answer: pressure varies
Q7. We are able to walk on earth without slipping because of
Answer: Frictional force
Q8. What is the phenomenon which established the transverse nature of light?
Answer: Polarisation
Q9. What is the name of the device used to convert alternating current into direct current?
Answer: Rectifier
Q10. Why does ice covered in sawdust not melt quickly?
Answer: Sawdust is a bad conductor of heat
Q11. Stars twinkle but planets do not twinkle because______
Answer: they are nearer to the earth and hence we recieve greater amount of light and therefore minor variations in intensity are not noticeable
Q12. The waching machine works on the principle of
Answer: Centrifugation
Q13. The choke used with a tube light is basically
Answer: an indicator
Q14. What type of force acts on a car moving around a curve?
Answer: Centripetal force
Q15. Which phenomenon is responsible for the echo of the sound wave?
Answer: Reflection
Q16. Which metal has the maximum thermal conductivity?
Answer: Silver
Q17. Temperature of different luminous bodies can be determined by
Answer: Pyrometers
Q18. Energy travels from sun to earth through
Answer: radiation
Q19. Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
Answer: Convection
Q20. If elecric resistance is to decreased , then the number of resistances should be connected in
Answer: Parallel
Q1. The material used in the electric heater is
Answer: Nichrome
Q2. Anemometer is an instrument meant for measuring
Answer: wind speed
Q3. The spring balance works on the principle of
Answer: Hooke's Law
Q4. If there were no gravity, then there will be no ______ for a liquid.
Answer: Upward Thrust
Q5. A ______ is a particle of matter with the same mass as an electron but an opposite charge.
Answer: positron
Q6. Gamma rays is extremely high-frequency ____________ radiation and therefor consists of high-energy photons.
Answer: electromagnetic
Q7. Magnetron is used for the production of
Answer: Microwaves
Q8. The intenisty of earthquake is measued with a
Answer: Seismograph
Q9. Photoelectric cell converts light energy into _______ energy.
Answer: Electrical
Q10. The fuse wire is made of
Answer: Lead-tin alloy
Q11. _______ are spots or patch that appears from time to time on the sun's surface, appearing dark by contrast with its surroundings.
Answer: Sunspots
Q12. X-ray is an electromagnetic wave of high energy and very _____ wavelength , which is able to pass through many materials opaque to light.
Answer: short
Q13. What makes the hairs of shaving brush cling together when removed from water?
Answer: Surface Tension
Q14. Centripetal force needed to keep the moon in its orbit round the earth is provided by
Answer: Gravitational pull of earth
Q15. If a magnetic substance is kept in a magnetic field then, ___________ substance is thrown out.
Answer: Diamagnetic
Q16. When the resultant forces are balanced or zero, objects move at a _______ speed.
Answer: Steady
Q17. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
Answer: Accommodation
Q18. Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon
Answer: the relative position and orientation of the two coils
Q19. _________ is a process that can produce electricity by using the temperature difference between deep cold ocean water and warm tropical surface waters.
Answer: Ocean Thermal Energy Conversion (OTEC)
Q20. The phenomena of light responsible for the working of the human eye is -
Answer: Refraction
Q1. When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
Answer: Peltier effect
Q2. The subatomic particle that does not have any electric charge is a/an _______.
Answer: Neutron
Q3. The velocity of sound in moist air is more than in dry air because the moist air has—
Answer: Conversion of hydrogen to helium
Q4. The major disadvantage of wave energy is that the energy is available on the _______.
Answer: ocean
Q5. The scattered solar radiation is also known as _________.
Answer: Diffuse Radiation
Q6. The force of attraction between an electron revolving around the nucleus and the nucleus is a _______force?
Answer: Electric
Q7. It is the product of power and time; its unit is W-s and KWH. What is it called?
Answer: Electrical energy
Q8. The line that joins the centre of curvature and the pole of a curved surface is called:
Answer: principal axis
Q9. ________is used as coolant in Atomic reactor.
Answer: Heavy water
Q10. ______ waves are used for communication in artificial satellites.
Answer: Radio Waves
Q11. Ability to distinguish two closely spaced objects is _________?
Answer: Resolving power
Q12. Energy in the foods can be measured in which units?
Answer:
Q13. A passenger falls in the forward direction when a moving bus applies brakes to stop and falls backwards when it accelerates from rest. This is because of ____
Answer: inertia
Q14. Why the clear nights are cooler than the cloudy nights?
Answer: Radiation
Q15. The Escape velocity on the Earth’s surface is about __________.
Answer: 11.2 km/sec
Q16. Hubble’s law is related to _________
Answer: Astronomy
Q17. The magnetic lines of force produced through a bar magnet ___________.
Answer: Do not cross anywhere in the magnet
Q18. The blackboard seems black because it _________.
Answer: Does not reflect any colour
Q19. A metal bar may be heated electronically by
Answer: Induction heating
Q20. Pieces of camphor placed on water move about rapidly. This is because of
Answer: surface tension
Q1. Who invented Bicycle
Answer: K. Macmillan
Q2. Which part of transformer is subjected to maximum heating
Answer: winding
Q3. What is the SI unit of calorific value of fuels?
Answer: Kilo Joule per kg
Q4. When a red glass is heated in dark room, it appears:
Answer: Green
Q5. What is Pulsar?
Answer: Rotating stars with fast velocity
Q6. One fathom is equal to–
Answer: 6 feet
Q7. Which energy is stored in spring of a clock ?
Answer: Potential energy
Q8. The moon has no atmosphere because.
Answer: its gravitational pull is not strong enough to hold an atmosphere
Q9. Escape velocity of a rocket fired from the earth towards the moon is a velocity to get rid of the.
Answer: earth’s gravitational pull
Q10. ________ colour of light is deviated least.
Answer: Red
Q11. _______is the ratio of the velocity of light in a vacuum to its velocity in a specified medium. Hence , it is unit less quantity.
Answer: Refractive index
Q12. If a heater coil is cut into two equal parts and only one part is used in the heater, the heat generated will be.
Answer: doubled
Q13. Primary rainbow is formed when light suffers
Answer: one internal refraction before emerging out of the drop
Q14. Weight of an object put in a satellite orbiting in space around the earth is.
Answer: reduced to zero
Q15. Kilowatt-hour is the unit of .
Answer: electric energy
Q16. An electric bell is placed inside a bell jar which is connected to a vacuum pump. When the bell jar is completely evacuated.
Answer: no sound can be heard
Q17. How can the spherical aberration of a human eye be corrected?
Answer: By using a cylindrical lens
Q18. Astigmatism (for a human eye) can be removed by using?
Answer: cylindrical lens
Q19. Imagine a solid object is placed at the bottom of a pool and floats when it is release.The object floats in water because ______.
Answer: The water is denser than the solid object.
Q20. The blue colour of the clear sky is due to
Answer: Scattering of light
Q1. 730 watt is equal to _____ horse power exactly.
Answer: 0.97
Q2. The speed of light ________with the temperature.
Answer: doesn't change
Q3. Superconductivity is a material property associated with
Answer: a loss of electrical resistance
Q4. The formation of colours in soap bubbles is due to the phenomenon of ________ of light.
Answer: interference
Q5. Leave of Lotus and water lily are not easily wet because the leaves have surface uneven at micro- cale and water cannot come into contact with the depressed areas due to high _______.
Answer: surface tension
Q6. The device used for locating Sub merged objects under sea in ________.
Answer: Sonar
Q7. _________ is the property of liquid by virtue of which it opposes the relative motion between, its different layers.
Answer: Viscosity
Q8. While ascending a hill, the driver of the vehicle keeps the gear ratio either equal to or greater than ______.
Answer: 1
Q9. The instrument used for navigating a ship is ________.
Answer: Sextant
Q10. The sun’s light takes about _______ to reach the Earth after it has been emitted from the sun’s surface.
Answer: 8 minutes
Q11. __________ used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.
Answer: Radiowaves
Q12. Kaleidoscope was invented by ________.
Answer: David Brewster
Q13. A fluid exerts an upward force on a body which is immersed fully or partially in it. The upward force that tends to lift the body is called the __________.
Answer: buoyant force
Q14. Electro-magnetic waves are
Answer: Transverse
Q15. If the radius of the earth decreases and its mass remains the same, then the value of “acceleration due to gravity” will _____.
Answer: Increase
Q16. Instrument for measuring time is called _____.
Answer: Chronometer
Q17. Which instrument determines specific gravity of liquids?
Answer: Hydrometer
Q18. Two speed boats moving parallel and close to each other are likely to attract together and collide due to which principle ?
Answer: Bernoulli’s principle
Q19. Diopter is unit for the measurement of which of the following quantity?
Answer: Power of the lens
Q20. Inertia of an object depend on_________?
Answer: Mass
Q1. Orbital speed of a satellite is independent of its________?
Answer: Mass
Q2. Why are metals good conductors of electricity?
Answer: Because they contain free electrons
Q3. Shortest distance covered by a body in a definite direction is called______?
Answer: Displacement
Q4. Echo sounding is the technique applied to .
Answer: Measure the depth of the sea
Q5. __________ (for generators) shows the direction of induced current when a conductor moves in a magnetic field.
Answer: Fleming’s right hand rule
Q6. ______ is the “work done by a moving unit charge between two points in an electric circuit”.
Answer: Potential Difference
Q7. __________ converts chemical energy to electrical energy
Answer: Battery
Q8. Georges Lemaitre is related with the ____________
Answer: Big Bang theory
Q9. An ordinary magnet does not attract______--
Answer: Bronze
Q10. A monkey sitting on a branch of a tree suddenly falling down towards the ground is an example of ________-
Answer: Law of conservation of energy
Q11. The ratio of the height of image to the height of object is known as:
Answer: Linear magnification
Q12. Bending of light at the boundary between two media is the effect of ______
Answer: Refraction
Q13. Germanium is a commonly used_______-
Answer: Semi-conductor
Q14. Speeds greater than the speed of sound in air are knows as_____.
Answer: Supersonic
Q15. A ____________ is an appliance or device designed to protect electrical devices from voltage spikes.
Answer: Surge Protector
Q16. A liquid drop, contracts because of the attraction of its particles and occupies the smallest possible area.This phenomenon is known as
Answer: Surface Tension
Q17. When tension in the cable is equal to the weight of the cable, the system is in equilibrium. It means the system is at rest or moving with _________.
Answer: uniform velocity
Q18. If a body is moving along a straight path then what will happen to the body in the absence of an external field?
Answer: It will move with the same speed along the same straight path
Q19. What is the main source of the sun's energy?
Answer: Nuclear fusion
Q20. What is the reason that neutrons with lower energy should be capable of causing fission?
Answer: For sustained reaction process
Q1. The _______ is the eye's outermost layer. It is the clear, dome-shaped surface that covers the front of the eye. It plays an important role in focusing your vision.
Answer: cornea
Q2. _________ type of the mirror is used in the headlamp of cars.
Answer: parabolic concave
Q3. Spectrometer and polarimeter are instruments used to study ______.
Answer: dispersion
Q4. If Q denotes the charge on the plate of a capacitor of capacitance C then the dimensional formula for [latex]\frac {{Q}^{2}}{2C}[/latex]is
Answer:
- [latex] {{[M}^{2}}{{L}^{2}}{T]}[/latex]
[latex] {[M}{{L}^{2}}{{T}^{2}]}[/latex]
[latex] {[M}{{L}^{2}}{{T}^{-2}]}[/latex]
[latex] {{[M}^{2}}{{L}^{2}}{{T}^{2}]}[/latex]
Q1. The change in focal length of an eye lens is caused by the action of the
Answer: Ciliary muscles
Q2. The least distance of distinct vision for a young adult with normal vision is about
Answer: 25 cm
Q3. Sensitive screen at back of eye is called ________.
Answer: Retina
Q4. A ________ alone can form a virtual, erect and diminished image.
Answer: concave lens
Q5. A student lying on the floor near a swimming pool wants to see an object at its bottom surface. The angle of incidence of light from the object on the surface of water is called :
Answer: critical angle
Q6. A concave mirror is used to form an image of the sun on a white screen. If the lower half of the mirror is covered with a black paper, the effect on the image on the screen would be :
Answer: to make the image less bright than before
Q7. The linear magnification of a convex lens is -1, when object in front of the lens is:
Answer: at 2F
Q8. The frequency of the rotation
Answer: depends on the value b
Q9. Tin cans are the tin electroplated on iron. These Tin cans are used to preserve food items. Why not iron cans used without Tin coating?
Answer: Tin is less reactive than Iron
Q10. Which property of the electricity is responsible for use of Fuse wire in household wiring?
Answer: Heating effect
Q11. Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is
Answer: 4 r
Q12. Device that disconnects supply automatically if current exceeds its normal value is known as _______.
Answer: Circuit breaker
Q13. As per Ohm's law, V (potential difference) is equal to
Answer: I (current) × R (resistance of the conductors)
Q14. What happens to its potential energy when an object is taken to high altitude?
Answer: Its potential energy increases
Q15. A bullet of mass 40gm is fired from a gun of mass 8kg with a velocity of 800 m/s, calculate the recoil velocity of gun
Answer: - 4 m/s
Q16. In the following example, try to identify the number of times the velocity of ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team.”
Answer: Four times
Q17. ______ is the quantitative or numerical measure of a body's inertia, that is of its resistance to being accelerated.
Answer: Mass
Q18. The radius of earth is?
Answer: 6.38 [latex]\times[/latex] [latex] {{10}^{6}}[/latex] m
Q19. The Universal law of gravitation must apply to?
Answer: Any pair of bodies.
Q20. ______ is the simplest type of motion and is along a straight line path. Such a motion is also known as translatory motion.
Answer: Rectilinear Motion
Q1. Displacement of a body is a ___________ quantity.
Answer: vector
Q2. Bats detect the obstacles in their path by receiving the reflected ____
Answer: ultrasonic waves
Q3. Sound energy passing per second through a unit area held perpendicular is called
Answer: intensity
Q4. How many Ergs are there in 1 joule?
Answer: [latex] {{10}^{7}}[/latex]
Q5. Radiation burn mainly due to _________.
Answer: beta and gamma radiations
Q6. Temperature at centre of Sun is nearly
Answer: 15 million Kelvin
Q7. Which colours of light are reflected from yellow pigment when white light is incident on it?
Answer: Yellow, Orange, Green
Q8. The complementary primary–secondary combinations are red-cyan, green– magenta, and _______________.
Answer: blue – yellow
Q9. Heating effect produced by current is due to the
Answer: collision of electrons
Q10. A _________ is a type of variable resistor, whose resistance can be changed so as to change the amount of current flowing through a circuit.
Answer: rheostat
Q11. Any _______ in a circuit that has a voltage drop across it dissipates electrical power. This electrical power is converted into heat energy which is used in consumption.
Answer: resistor
Q12. If the earth is 1/4th of its present distance from the sun, the duration of the year would be
Answer: 1/8 of the present year
Q13. There is no atmosphere on the moon because
Answer: the escape velocity of gas molecules is less than their root mean square velocity here
Q14. If the change in the value of g at the height h above the surface of the earth is the same as at a depth d below it, then (both d and h is much smaller than the radius of the earth)
Answer: dv = v2h
Q15. Which fuel has the highest calorific value?
Answer: Hydrogen gas
Q16. The human eye can focus of all the images at the retina by changing the focal length of its lens. This is due to
Answer: Accommodation
Q17. An object is held at 40 cm from a concave lens of focal length 60 cm, The distance of the image from the lens is :
Answer: 24 cm
Q18. The angle at which no reflection occurs in the medium of origin is called _________
Answer: Brewster angle
Q19. In order to produce solar energy during sunlight, where the energy is stored in the batteries?
Answer: Nickel Cadmium
Q20. In the production of wave energy which form of energy is used?
Answer: Kinetic energy
Q1. In India, the _______is utilised through the photo voltaic route. This can also be utilised from the thermal route
Answer: solar energy
Q2. A person suffering from hypermetropia uses
Answer: convex lens
Q3. Sources of sound and observer are moving towards each other, the observer will hear
Answer: High frequency, low wavelength
Q4. The time period of an earth satellite in circular orbit is independent of-
Answer: the mass of the satellite
Q5. Fossils fuel is regarded as an energy resource which is
Answer: non renewable
Q6. Black painted panels which are hanged at roofs to trap heat and energy from sun, is known as __________.
Answer: Solar collector
Q7. A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest
Answer: at the instant just before the body hits the earth
Q8. Reflecting mirrors used for exploiting solar energy are called........
Answer: Heliostats
Q9. Due to ____________, one end of the rod becomes positive and the other end negative. This developes an electric field in the rod.
Answer: shifting of electrons
Q10. A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting near vision?
Answer: 0.667 m
Q11. The velocity of sound in moist air is more than in dry air because the moist air has—
Answer: more density than dry air
Q12. X-rays can be used—
Answer: to detect defects in precious stones and diamonds
Q13. Which sphere is composed of Iron and Nickel?
Answer: Lithosphere
Q14. Communication satellites are used to :
Answer: receive and redirect communication signal
Q15. Why is heavy water a suitable moderator in nuclear reactor?
Answer: It decreases the velocity of neutrons
Q16. Which part of the atom emits the radioactive radiation?
Answer: Nucleus
Q17. A place through which, data can enter or leave a computer is called:
Answer: port
Q18. Distances of stars are measured in:
Answer: Light year
Q19. In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to:
Answer: N
Q20. 'Mirage' is an example of
Answer: refraction and total internal reflection of light
Q1. Depression formed due to deflating action of winds are called
Answer: Yardang
Q2. Which zone of a candle flame is the hottest?
Answer: Outermost zone
Q3. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
Answer: momentum
Q4. The atmospheric air is held to the Earth by:
Answer: gravity
Q5. _______ is responsible for the extra strength of pyrex glass.
Answer: Borox
Q6. The propagation of sound waves in a gas involves
Answer: adiabatic compression and rarefraction
Q7. When a red glass is heated in dark room, it appears
Answer: Green
Q8. Specific Latent heat of vapourization of water is:
Answer: 533 calories/gm
Q9. ___________ is defined as the frictional force that comes into play when someone try to move an object which is at rest.
Answer: Static friction
Q10. The loudness of sound coming from the busy traffic is____________.
Answer: 70 dB
Q11. A large force acting for a short time to produce a finite change in momentum is called___________.
Answer: An Impulsive force
Q12. What happens to the surface tension of water when soap is mixed in the water?
Answer: Surface tension decreases
Q13. There are two basic laws of _______. The first law states that the incident, the reflected ray and the normal at the point of incidence all lies in the same plane. The second law states that the angle of reflection always equals to the angle of incidence.
Answer: reflection
Q14. Which method is suitable for heating of coducting medium ?
Answer: Eddy Current heating and Induction heating
Q15. We receive sunlight on earth surface. What type of light beams are these?
Answer: Random
Q16. Angle of friction and angle of repose are
Answer: equal to each other
Q17. Certain substances loose their electrical resistance completely at super low temperature. Such substances are called:
Answer: super conductors
Q18. What is the time period of oscillation for a simple pendulum?
Answer: [latex]T = 2 \pi \sqrt {\frac {l}{g}}[/latex]
Q19. Meteors and Meteorites are also called _________. Meteors are fragments of rocks coming towards the earth, formed due to the collision of asteroids with one another.
Answer: Shooting Stars
Q20. Rainbow is formed due to:
Answer: refraction and reflection
Q1. The phenomenon of light associated with the apprearance of blue colour of the sky is
Answer: Scattering
Q2. What is the frequency range for Ultrasonic waves?
Answer: Greater than 20000Hz
Q3. Who discovered Cathode rays?
Answer: J.J. Thomson
Q4. When lens is dipped in a liquid of higher refractive index. What effect does its focal length have?
Answer: It Increases
Q5. When a particle executing SHM is at the extreme end then, potential energy of the particle is maximum, kinetic energy of a particle is zero and velocity of particle is also ______.
Answer: zero
Q6. What is the escape velocity at moon?
Answer: 2.4 km/s
Q7. Acceptable " Noise Pollution Level" in India range between -
Answer: 45-55 db
Q8. When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by
Answer: passing an electric current
Q9. At _____________, the volume of the fixed mass of a gas is inversely proportional to its pressure.
Answer: constant temperature
Q10. What is the wavelength range of X-rays?
Answer: [latex] {{10}^{-12}} to {{10}^{-8}}[/latex] m
Q11. Light year is the unit of Distance. It is the distance traveled by light in ______ year.
Answer: one
Q12. When we mix salt in water, its surface tension
Answer: Increases
Q13. The hydraulic brake used in automobiles is a direct application of -
Answer: Pascal's law
Q14. Superconductivity is a material property associated with
Answer: a loss of electrical resistance
Q15. Imagine a solid object is placed at the bottom of a pool and floats when it is release.The object floats in water because ______
Answer: The water is denser than the solid object.
Q16. Light waves projected on oil surface shows many colours due to-
Answer: Interference
Q17. An object of mass 1 kg has potential energy of 1 joule relative to the ground when it is at a height of _______.
Answer: 0.012m
Q18. Below which temperature radiation pyrometer cannot measure the temperature of a body?
Answer: [latex] {{800}^{0}}[/latex] C
Q19. A coolie carries a load of 500 N to a distance of 100 m. The work done by him is:
Answer: 50,000 Nm
Q20. 730 watts = ______h.p. (approximately)
Answer: 6
Q1. The speed of light with the rise in the temperature of the medium:
Answer: Remains unaltered
Q2. Why the oil of oil lamp rises up in the wick?
Answer: Because of the surface tension
Q3. The acceleration due to gravity and the weight of an object is 9.8 m/sec 2 and 60 N respectively. What will be the mass of the object?
Answer: 6.12 kg
Q4. What is the wavelength range of X-rays?
Answer: [latex] {{10}^{-10}} to {{10}^{-8}}[/latex] m
Q5. Which of the following equation denotes Stefan’s Law?
Answer: [latex]E = \sigma {{T}^{4}}[/latex]
Q6. Surface tension arises due to:
Answer: cohesive force between molecules
Q7. Which type of energy conversion is Dynamo responsible for?
Answer: Mechanical energy to Electrical energy
Q8. Recoiling of a gun is an example which Newton’s law of Motion?
Answer: Newton’s third law
Q9. What is the SI unit of Luminous Intensity?
Answer: Candela
Q10. What happens to a body when it falls in a viscous medium?
Answer: Its velocity first increases, then becomes constant
Q11. The SI unit of intensity of sound is ______.
Answer: watt per square meter
Q12. Electric Motor converts _____ energy to mechanical energy
Answer: Electrical
Q13. The half-life of a radioactive substance depends upon
Answer: The mass of the substance
Q14. __________ are used to transmit radio and TV signals but some of them are using radio waves
Answer: Infrared waves
Q15. The mass of a body is not the same as its ___________.
Answer: weight
Q16. Mass is a measure of quantity of matter whereas weight is a _________.
Answer: force
Q17. In the MKS system, mass is expressed in kilogram and weight in _________.
Answer: newton
Q18. Heat produced by the resistor is,
Answer: [latex]H = {{i}^{2}} RT[/latex]
Q19. Gravitational constant (G) is an example of
Answer: Dimensional constant
Q20. OTEC stands for -------------- ?
Answer: Ocean Thermal Energy Conversion
Q1. The speed of data transmission can be measured in terms of -------------------.
Answer: Bits per second
Q2. A transformer mainly transforms?
Answer: Power
Q3. What is the power factor of a pure resistor circuit?
Answer: One
Q4. An exciter for a turbo generator is a?
Answer: Separately excited generator
Q5. ______________ is most accurate instrument
Answer: Optical projector
Q6. _______are the most difficult to stop and require concrete, lead, or other heavy shielding to block them.
Answer: Gamma rays
Q7. The transient response of a system is mainly due to?
Answer: Stored energy
Q8. Minority carrier in P-type semi-conductor are?
Answer: Free holes
Q9. Pulley in a belt drive acts as?
Answer: Rolling pair
Q10. ________ is used in the blast furnace as flux.
Answer: Fluorspar
Q11. The waves which are the most commonly used in the Night Vision Devices___?
Answer: Infrared waves
Q12. In a resistive load, power dissipation would be proportional to?
Answer: [latex] {{(Current)}^{2}} [/latex]
Q13. An automatic toaster is a _____________ loop control system.
Answer: Open
Q14. _________ (Science of color) is the branch of optics that deals with the properties of colors.
Answer: Chromatics
Q15. What is the initial velocity of an object of mass 15kg that starts from the rest?
Answer: 0
Q16. The distance covered by a car in 5 h if it is moving with a speed of 75 km/h is________?
Answer: 375 km
Q17. What is the acceleration of an object moving in uniform velocity?
Answer: zero
Q18. Usually the outside rear view mirrors of a motor vehicle are ______?
Answer: Convex mirrors
Q19. The ______________ is used to measure sound level, but it is also widely used in electronics, signals and communication.
Answer: decibel (dB)
Q20. The physical quantity that is defined as the rate of change of displacement is called as______?
Answer: Velocity
Q1. A dynamo is a device which_________?
Answer: converts mechanical energy into electrical energy
Q2. __________is an example for cantilever beam.
Answer: Bridge
Q3. Two stones of different masses are dropped simultaneously from the top of a building.
Answer: Both the stones reach the ground at the same time
Q4. What is the unit of magnetic field?
Answer: Tesla
Q5. __________, also referred to as climate change, is the observed century-scale rise in the average temperature of the Earth's climate system and its related effects. Multiple lines of scientific evidence show that the climate system is warming.
Answer: Global warming
Q6. The Instrument used to see the distant objects on the Earth is_______?
Answer: Terrestrial telescope
Q7. Knot is a measure of
Answer: The speed of ship
Q8. [latex] {3.6} \times {{10}^{3}} J[/latex] is equivalent to _______?
Answer: watt/hour
Q9. The time period of a seconds pendulum is
Answer: seconds
Q10. If the earth stops rotating, the apparent value of g on its surface will :
Answer: increase at some places and remain the same at other places
Q11. For the motion of planets around the sun, which force is responsible?
Answer: Gravitational
Q12. The SI unit of dynamic viscosity is ____________?
Answer: Pascal-second
Q13. _________ Waves are required for long distance wireless communication.
Answer: Radio
Q14. ‘Sun is a constant source of energy.’ Which nuclei get fused in Sun’s atmosphere?
Answer: Hydrogen
Q15. Which device steps up or steps down the voltage?
Answer: Transformer
Q16. Sound is recorded in tape recorder in which form?
Answer: Magnetic energy
Q17. What is measured by Lactometer?
Answer: Purity of Milk
Q18. --------------- is used in fancy electronic devices such as toys to emit visible light.
Answer: Light Emitting Diode (LED)
Q19. A solid cannot change its shape easily compared to liquid because of :-
Answer: stronger intermolecular force in solid
Q20. The swing of a spinning cricket ball in air can be explained on the basis of
Answer: Turbulence caused by wind
Q1. A transformer works with ----------------- .
Answer: Alternating Current
Q2. What is meant by the term ‘cirrus’?
Answer: high-altitude cloud
Q3. There is a change in -------------- and ----------------- when light passes from air into glass.
Answer: wavelength and speed
Q4. Communication satellite are used to -
Answer: receive and redirect communication signal
Q5. The passengers are not allowed to stand in a boat because:-
Answer: This will raise the centre of gravity and the boat will be rocked.
Q6. Why ink is absorbed by blotting paper?
Answer: Due to capillary action phenomenon
Q7. If an egg is placed inside micro-wave oven, what would happen?
Answer: Egg shell will explode
Q8. What does rise of mercury in a barometer indicate?
Answer: fair weather
Q9. The best conductor of electricity is:-
Answer: Salt water
Q10. If the door of a refrigerator is left open, the temperature of the room will
Answer: Increase
Q11. A charged coupled device in modern digital camera has replaced ----------- in traditional camera.
Answer: photographic film
Q12. An instrument Theodolite is used for measuring -
Answer: horizontal and vertical angle in triangular network
Q13. What is the minimum length of plane mirror to see the full image of a person?
Answer: Half the height of person
Q14. Why pendulum clocks become slow in summer season?
Answer: Length of pendulum increases
Q15. When a vector is having magnitude only, it is called_______
Answer: Unit vector
Q16. In case of equal momentum for both light and heavy body, which one will be having the greater kinetic energy?
Answer: The light body
Q17. In space, the colour of sky looks to an astronaut:
Answer: black
Q18. The waves used in Sonography are -------------.
Answer: ultrasonic waves
Q19. What we call it when the resistance of a material increases with temperature?
Answer: Metal
Q20. Young's modulus is the property of which state of the matter?
Answer: Solid
Q1. Transfer of heat in liquids and gases is merely called______?
Answer: Convection
Q2. ____________ is the product of the mass and velocity of an object, quantified in kilogram-meters per second.
Answer: Momentum
Q3. What is the smallest unit to measure wavelength?
Answer: Angstrom
Q4. An Instrument, used to measure the intensity of light is_________?
Answer: Lux meter
Q5. The part of the eye having the largest refractive index is _____.
Answer: lens
Q6. What will happen with the time period of a pendulum when it is taken to the Moon?
Answer: increase
Q7. ___________ is used for making solar cells. Solar cells are typically named after the semiconducting material they are made of. These materials must have certain characteristics in order to absorb sunlight.
Answer: Silicon
Q8. __________ is a measure of the resisting power of a specified material to the flow of an electric current.
Answer: Resistivity
Q9. What should a person do to decrease his (angular) speed on a freely rotating turn table?
Answer: Spread his hands outwards
Q10. To which of the following waves do not require any material medium for propagation?
Answer: Electromagnetic waves
Q11. The circuit element is used to block DC in an electronic circuit?
Answer: Capacitance
Q12. Which planet exist the situation like pressure cooker?
Answer: Venus
Q13. The instrument, used to measure the curvature of spherical objects is_________?
Answer: Spherometer
Q14. The resistance of a conductor is inversely proportional to:
Answer: Its coss sectional area
Q15. Why do we get the smell of hot food from the kitchen outside the house?
Answer: Diffusion
Q16. The density of gas is maximum at _______________
Answer: Low temperature and, high pressure
Q17. Transformer changes the ______ in the electrical circuit.
Answer: Voltage
Q18. What is that instrument which can detect the presence of electric current in a circuit?
Answer: Galvanometer
Q19. What is the full form of LASER?
Answer: Light Amplification by Stimulated Emission of Radiation
Q20. Which device is used to measure the heating power of radiation?
Answer: Actinometer
Q1. __________are magnets retain their magnetism once magnetized. There are typically four categories of permanent magnets: neodymium iron boron (NdFeB), samarium cobalt (SmCo), alnico, and ceramic or ferrite magnets.
Answer: Permanent magnets
Q2. Which law states that if the volume of a container is held constant as the temperature of a gas increases, the pressure inside the container will also increase.
Answer: Gay - Lussac’s law
Q3. A virtual image larger than the object can be formed by which mirror or lens
Answer: Concave mirror
Q4. Speed of the aircrafts can be recorded with
Answer: Machmeter
Q5. Why use of mercury over water is preferred In a barometer?
Answer: Mercury has high density and low vapour pressure
Q6. 2u [latex] sinθ ÷ g [/latex] is associated with which type of motion?
Answer: Projectile motion
Q7. What is the magnitude of the escape velocity of the earth?
Answer: 11.2 km/sec
Q8. A bulb of 100 W is operating for 7 hours a day. Find units of energy consumed in 7 days?
Answer: 4.9 units
Q9. The resistance of a conductor is directly proportional to:
Answer: length
Q10. Which instrument is used for measuring electric potential?
Answer: voltmeter
Q11. _____ or Toughened glass or tempered glass is a kind of safety glass which is used as a component of bulletproof glass, for diving masks, and various types of plates and cookware.
Answer: Reinforced Glass
Q12. The Pascal’s law explains working of ----------------in automobiles
Answer: Hydraulic brakes
Q13. Which method is used to produce electricity in thermal power plant?
Answer: By boiling water
Q14. Tungsten is commonly used for the manufacturing of the filament of an electric bulb, because of.
Answer: It has the highest melting point
Q15. Why Stars appears to move from east to west?
Answer: the earth rotates from west to east
Q16. The amount of light entering the human eye is controlled by
Answer: Pupil
Q17. Electron beam therapy is a kind of radiation therapy to treat.
Answer: Certain types of cancer
Q18. A jet engine work on the principle of conservation of.
Answer: Linear momentum
Q19. Butter paper is an example of ……… object.
Answer: A translucent
Q20. It is easier to roll a barrel full of coal tar than to pull it because-
Answer: the rolling friction is much less than the sliding friction
Q1. What happens to the speed of sound when the temperature decreases ?
Answer: Increases
Q2. A magnifying glass is what type of lens
Answer: Convex lens
Q3. A radioactive element emits an alpha particle. The mass number of the element after emission
Answer: Decrease by four
Q4. Graphite and heavy water are two common moderators used in a nuclear reactor. The function of the moderator is to
Answer: Slow down neutrons
Q5. _________________containing the Sun and its Solar System, and therefore Earth.
Answer: Milky Way galaxy
Q6. Computed tomography (CT) Scan generally uses ________?
Answer: X-Rays
Q7. The following component of a fluorescent lamp contributes maximum in making them costly is______?
Answer: Ballast
Q8. Name the instrument, used in Forensic Sciences that is, known to be a Lie detector?
Answer: Polygraph
Q9. When a Red Glass Plate and a Blue Glass plate combined, it will transmit ______?
Answer: No Light
Q10. What is an electrical fuse used to ________?
Answer: interrupt excessive Current
Q11. In electromagnetism, _________________is the measure of the ability of a material to support the formation of a magnetic field within itself otherwise known as distributed inductance in Transmission Line Theory. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field
Answer: permeability
Q12. Galvanizing is a metallurgical process that is used to coat steel/iron with____________?
Answer: Zinc
Q13. What does BOD stands for?
Answer: Biological Oxygen Demand
Q14. What should the ideal fluid which is a hypothetical fluid contain?
Answer: Zero Viscosity & Zero Compressibility
Q15. Newton-meters per second is represented as follows__________?
Answer: Watt
Q16. Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. __________________ is absorbed and electron is emitted.
Answer: High Energy Photon
Q17. Sound can propagate through a medium such as air, water and solids as _____________and also as a transverse wave in solids. The sound waves are generated by a sound source, such as the vibrating diaphragm of a stereo speaker.
Answer: longitudinal waves
Q18. Which colour will scatter the most while passing through a prism?
Answer: Violet
Q19. If a body is reflecting all the rays falling on it then it will appear ….?
Answer: White
Q20. Farad is the ______ of capacitance. 1 Farad is the capacitance if a charge of 1C increases potential difference by 1 volt
Answer: unit