36. Find the odd one out: 1, 5, 14, 30, 50, 55, 91
a) 5
b) 50
c) 55
d) 91
Answer:
b) 50
Explanation:
The sequence represents the sum of consecutive squares: 1², 1²+2²(5), 1²+2²+3²(14), 14+4²(30), 30+5²(55), 55+6²(91). The number 50 breaks this pattern.
37. Today is Thursday. The day after 59 days will be
a) Tuesday
b) Monday
c) Sunday
d) Wednesday
Answer:
c) Sunday
Explanation:
The days of the week repeat every 7 days. 59 divided by 7 leaves a remainder of 3. Thursday plus 3 days equals Sunday.
38. Which number replaces the question mark?1562 63 14 55 ?
a) 8
b) 4
c) 6
d) 9
Answer:
b) 4
Explanation:
Reading the rows as two-digit numbers gives 26, 31, 45, and 5?. Their sum equals the top number: 26 + 31 + 45 = 102. To get 156, the final number must be 54 (156 – 102 = 54). Thus, the missing digit is 4.
39. The main chemical responsible for ozone depletion is
a) PAN
b) Sulphur dioxide
c) CO
d) CFCs
Answer:
d) CFCs
Explanation:
Chlorofluorocarbons (CFCs) are the primary ozone-depleting substances that break down ozone molecules in the stratosphere.
40. When is the World Environment Day celebrated?
a) 5 June
b) 21 June
c) 8 June
d) 11 June
Answer:
a) 5 June
Explanation:
World Environment Day is celebrated annually on 5 June to encourage awareness and environmental protection.
