Q1. The last day of a century cannot be
A. Monday
B. Wednesday
C. Tuesday
D. Friday
Answer: C
Explanation:
100 years contain 5 odd days
Last day of first century is Friday
200 years contain (5 [latex] \times 2[/latex]) = 3 odd days
Last day of second century is Wednesday
300 years contain (5 [latex] \times 3[/latex]) = 15 = 1 odd day
Last day of third century is Monday
400 years contain 0 odd days
The last day of fourth century is Sunday
This Cycle is Repeated.
Last day of acentury cannot be Tuesday, Thursday, or Saturday.
Q2. What was the day of the week on, 16th July 1776?
A. Tuesday
B. Wednesday
C. Monday
D. Saturday
Answer: A
Explanation:
16th July, 1776 = (1775 years + Period from 1st Jan, 1776 to 16th July, 1776)
Counting of Odd days:
1600 years have 0 odd day.
100 years have 5 odd days.
75 years = (18 leap years + 57 ordinary years) = [(18 x 2) + (57 x 1)] = 93 (13 weeks + 2 days) = 2 odd days
1775 years have (0 + 5 + 2) odd days = 7 odd days = 0 odd day.
1775 years have (0 + 5 + 2) odd days = 7 odd days = 0 odd day. Jan Feb Mar Apr May Jun Jul
31 + 29 + 31 + 30 + 31 + 30 + 16 = 198 days = (28 weeks + 2 days)
Total number of odd days = (0 + 2) = 2.
Required day was 'Tuesday'.
Q3. It was Sunday on Jan 1, 2006. What was the day of the week Jan 1, 2010?
A. Monday
B. Friday
C. Sunday
D. Tuesday
Answer: B
Explanation:
On 31st December, 2005 it was Saturday.
Number of odd days from 2006 to 2009 = (1 + 1 + 2 + 1) = 5 days.
On 31st December 2009, it was Thursday.
Thus, on 1st Jan 2010 it is Friday
Q4. What was the day of the week on 28th May, 2006?
A. Sunday
B. Friday
C. Wednesday
D. Tuesday
Answer: A
Explanation:
28 May, 2006 = (2005 years + Period from 1.1.2006 to 28.5.2006)
Odd days in 1600 years = 0
Odd days in 400 years = 0
5 years = (4 ordinary years + 1 leap year) = (4 x 1 + 1 x 2) = 6 odd days
(31[jan] + 28 [Feb]+ 31[Mar] + 30[April] + 28[May] ) = 148 dayss = (21 weeks + 1 day) = 1 odd day.
Total number of odd days = (0 + 0 + 6 + 1) = 7 = 0 odd days.
Q5. What was the day of the week on 17th June 1998 ?
A. Monday
B. Tuesday
C. Wednesday
D. Friday
Answer: C
Explanation:
17th June, 1998 = (1997 years + Period from 1.1.1998 to 17.6.1998)
Odd days in 1600 years = 0
Odd days in 300 years = 1
97 years has 24 leap years + 73 ordinary years.
Number of odd days in 97 years ( 24 x 2 + 73) = 121 = 2 odd days.
Jan. Feb. March. April. May. June.
(31 + 28 + 31 + 30 + 31 + 17) = 168 days
168 days = 24 weeks = 0 odd day.
Total number of odd days = (0 + 1 + 2 + 0) = 3.
Given the day is Wednesday.