 # UPSC CSE General Mental Ability

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# UPSC CSE General Mental Ability

### Introduction

What is the definition of General Mental Ability? General mental ability (GMA) is a term used to describe the level at which an individual learns, understands instructions, and solves problems. Tests of general mental ability include scales that measure specific constructs such as verbal, mechanical, numerical, social, and spatial ability. The overall score is considered the most important factor, explaining more variation in individual performance than specific abilities.
The article UPSC CSE General Mental Ability provides questions with answers useful to the candidates preparing for General Mental Ability module for several competetive exams.

### Quiz

1. A person has 4 coins each of different denomination. What is the number of different sums of money the person can form (using one or more coins at a time)?
A. 16 B. 15 C. 12 D. 11

Explanation: To select 1 coin out of 4 coins:   ⁴C₁ = 4 Different sums  possible Selecting 2 coins out of 4 coins:  ⁴C₂ = 6 different sums  possible Selecting 3 coins out of 4 coins: ⁴C₃ = 4 different sums  possible Selection 4 coins out of 4 coins: ⁴C₄ =1 sum  possible Hence total number of different sums are  : 4 + 6 + 4 + 1 =  15
2. A man fills a basket with eggs in such a way that the number of eggs added on each successive day is the same as the number already present in the basket. This way the basket gets completely filled in 24 days. After how many days the basket was 1 / 4th full?
A. 6 B. 12 C. 17 D. 22

Explanation: Let x be the no. of eggs already present in the basket. Then, no. of eggs on each successive days: x, 2x, 4x, 8x, ............ up to 24 days. From here, we can see that the number of eggs are getting doubled on each successive days. On 24th day basket was filled completely. ∴ On 23rd day basket was filled = $\frac{1}{2}$ Hence, on the 22nd-day basket was filled = $\frac{1}{2}$($\frac{1}{2}$) = $\frac{1}{4}$
3. A cuboid has six sides of different colours. The red side is opposite to black. The blue side is adjacent to white. The brown side is adjacent to blue. The red side is face down. Which one of the following would be the opposite to brown?
A. Red B. Black C. White D. Blue

Explanation:
4. A candidate attempted 12 questions and secured full marks in all of them. If he obtained 60% in the test and all questions carried equal marks, then what is the number of questions in the test?
A. 36 B. 30 C. 25 D. 20

Explanation: Let The Number of the question in the test = n  question attempted by candidate = 12  marks obtained by candidate   = 60%  60% of n = 12  ($\frac{60}{100}$) n = 12  n = 12 x $\frac{100}{60}$ n = 20
5. A person traveled a distance of 50 km in 8 hours. He covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. How much distance did he travel on foot?
A. 10 km B. 20 km C. 30 km D. 40 km

Explanation: A person travelled a distance of 50km in 8 hrs. he covered a part of the distance on foot at the rate of 4 km per hour and a paet on a bicycle at the rate of 10 km per hour Total Distance = 50 km Total Time is taken = 8 hrs Let say he covered X km on Foot Speed on Foot = 4km/Hr Time has taken on Foot  = X/4  hrs Distance covered on Bicycle = 50 - X  km Speed on Bicycle = 10 km/Hr Time took on Bicycle =  ($\frac{50- x}{10}$) = $\frac{5 - x}{10}$ hr Time took on Foot + Time took on Bicycle  = Total Time => $\frac{x}{4}$ + 5 - $\frac{x}{10}$ = 8 => $\frac{(5x - 2x)}{20}$ = 3 =>  3x = 60 => x = 20
1. A person travels 12 km due North, then 15 km due East, after that 15 km due West and then 15 km due South. How far is he from the starting points?
A. 6 km B. 12 km C. 33 km D. 60 km

Explanation: let O be the starting point and P, Q and R the positions after every movement. Hence, Distance from the starting point = Distance of final position R from O = OR = 18 – 12 = 6 km.
2. A person X has four notes of Rupee 1, 2 , 5 and 10 denomination. The number of different sums of money she can form from them is
A. 16 B. 15 C. 12 D. 8

Explanation: As a person has to make different sum of money using these four different notes of different denominations. So, the possible ways he could do this is by making the following combinations: 1 , 2 , 5, 10 , 1+2 , 1+5 , 1+10 , 2+5 , 2+10 , 5+10 , 1+2+5 , 1+5+10 , 2+5+10 , 1+2+10 , 1+2+5+10 This means that there are a total of 15 cases. Also this can be done by the method of combination. i.e the different combinations possible are: ⁴C₁ + ⁴C₂ + ⁴C₃ + ⁴C₄
3. In a certain code, language COMPUTER is written as RFUVQNPC. How will MEDICINE be written in that code language?
A. MFEDJJOE B. EOJDEJFM C. MFEJDJOE D. EOJDJEFM

Explanation: - There are 8 letters in the word. - The code word can be obtained by taking the immediately following letters of word, expect the first and the last letters of the given word but in the reverse order. That means, in the coded form the first and the last letters have been interchanged while the remaining letters are coded by taking their immediate next letters in the reverse order.
4. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z. Which letter in this alphabet is the eighth letter to the right of the letter and which is the tenth letter to the left of the last but one letter of the alphabet?
A. X B. W C. I D. H

Explanation: In the given alphabet, last but one letter of the alphabet is Y. 10th letter to the left of Y is O 8th letter to the right of O is W
5. Seismography: Earthquake:: Tachometer:?
A. Landslides B. Strains C. Resistances D. Volcanoes

Explanation: Seismography is an instrument to measure the intensity of an earthquake. Similarly, tachometer is an instrument to measure strains.
1. Statement: Children catch infections when they eat roadside food. Courses of Action: I. Parents should not allow their children to eat roadside food but rather try to prepare that type of food at home. II. The children should be taught about what is healthy food and that the type of food prepared on the road side is not healthy.
A. if only I follow. B. if only II follows. C. if either I or II follows. D. if neither I nor II follows. E. if both I and II follow.

Explanation: These statement does not indicate why the roadside food leads to infection. It may be because it is cooked in unhygienic conditions. In such a case, I is a proper course of action but not II. If the food itself is unhealthy, then II is a proper course of action but not I. Hence, either I or II follows.
2. Statement: More than 50% of today's working youth, who have surplus money, are addicted to drugs. The course of Action: I. Work stress should be reduced in the office. II. The salaries should be cut down.
A. If only I follow. B. If only II follows. C. If either I or II follows. D. If neither I nor II follows. E. If both I and II follow.

Explanation: We do not know the reason for the addiction, so neither I nor II is a proper course of action.
3. Statement: Many deaths are occurring in Village 'X', which has experienced heavy rains in the last three monsoons, due to the outbreak of epidemics. The course of Action: I. The government should dig a side canal to pass the excess rainwater. II. Health care system in the village should be strengthened.
A. If only I follow. B. If only II follows. C. If either I or II follows. D. If neither I nor II follows. E. If both I and II follow.

Explanation: The course of action I is a time taking process. Hence, I is not a proper course of action. Since the deaths are occurring due to epidemics, II is a proper course of action.
4. Statement: The Indian cricket team reached the finals of the previous six major tournaments but failed to win even a single tournament. The course of Action: I. The Indian cricket board should set up a committee to find out the reasons. II. The team should change its game plan.
A. If only I follow. B. If only II follows. C. If either I or II follows. D. If neither I nor II follows. E. If both I and II follow.

Explanation: As the Indian cricket team lost continuous six finals, a proper investigation is necessary. So I follow. The statement does not give scope to ascertain the reason. So II does not follow.
5. Statement: In the road accidents, the pillion riders are receiving more head injuries than the driver. The course of Action: I. Pillion riders should also wear a helmet. II. The rule should be changed so that the helmet is made compulsory for the pillion riders but not the drivers.
A. If only I follow. B. If only II follows. C. If either I or II follows. D. If neither I nor II follows. E. If both I and II follow.

Explanation: Here as the pillion riders are receiving more head injuries, the helmet can save them from head injuries. I is a proper course of action. II causes a new problem, i.e., injuries to the driver. So II is not a proper course of action.

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