Q. 71. Solve: 9501 – ? = 3697
(A) 13198
(B) 5814
(C) 5804
(D) 4894
Answer:
(C) 5804
Explanation:
Let the missing number be x. 9501 – x = 3697. Thus, x = 9501 – 3697 = 5804.
Q. 72. What is the H.C.F of 42, 63 and 140?
(A) 14
(B) 9
(C) 21
(D) 7
Answer:
(D) 7
Explanation:
Breaking into prime factors: 42 (2x3x7), 63 (3x3x7), and 140 (2x2x5x7). The only common prime factor among all three is 7.
Q. 73. Evaluate: 0.09 x 0.004
(A) 0.00036
(B) 0.0036
(C) 0.036
(D) 0.000036
Answer:
(A) 0.00036
Explanation:
9 x 4 = 36. There are two decimal places in 0.09 and three in 0.004, totaling five decimal places. So, the result is 0.00036.
Q. 74. 1 litre of water weighs 1 kg. How many cubic millimetres of water will weigh 0.1gm?
(A) 0.1
(B) 1
(C) 10
(D) 100
Answer:
(D) 100
Explanation:
1 litre = 1,000,000 cubic millimeters (mm³), which weighs 1 kg (1,000g). Thus, 1g = 1,000 mm³. Therefore, 0.1g weighs 100 mm³.
Q. 75. Evaluate: 0.05 x 5 – 0.005 x 5 = ?
(A) 2.25
(B) 0.225
(C) 2.025
(D) 0.29875
Answer:
(B) 0.225
Explanation:
0.05 x 5 = 0.25. 0.005 x 5 = 0.025. Subtracting them: 0.25 – 0.025 = 0.225.
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