mathematics MCQs – Page 67

Practise multiple-choice questions from mathematics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

1321. 6 [5/6 + {3 7/8 2 1/3 + 1 7/9}] = _____________?
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A. 2 11/72

B. 3 9/13

C. 1 9/11

D. None of these
1322. If the diameter of a circle is increased by 100 % its area is increased by:_________?
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A. 400%

B. 200%

C. 300%

D. 100%

1323. I. 9a<sup>2
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A. If a ? b

B. If a < b

C. If a > b

D. If a ? b

1324. If the roots of the equation 2x<sup>2
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A. 6

B. 5

C. 4

D. 3
1325. A room is 15m long, 4m broad and 3m height. Find the cost of white washing its four walls at 50p per m<sup>2
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A. Rs.57

B. Rs.55

C. Rs.52

D. Rs.60

1326. Surface area of two spheres are in the ratio 1:4 what is the ratio of their volumes?
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A. 1:8

B. 1:04

C. 8:01

D. 0.086111111

1327. The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is___________?
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A. 50

B. 51.4 approx.

C. 45

D. 54.6 approx.

1328. The volume of a cube is 1728 cc. Find its surface.
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A. 486 cm<sup>2</sup>

B. 864 cm2

C. 468 cm<sup>2</sup>

D. 648 cm<sup>2</sup>

1329. One top can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened?
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A. 5 Hours

B. 8 Hours

C. 7 Hours

D. 6 Hours
1330. Which of the following has most number of divisors?
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A. 182

B. 176

C. 101

D. 99

1331. Find the roots of the quadratic equation: 22 + 3x 9 = 0?
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A. 3, -3/2

B. 3/2, -3

C. -3/2, -3

D. 3/2, 3

1332. What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
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A. 344.35 cm2

B. 344.35 cm2

C. None of these

D. 344.35 cm2

1333. The radius of a wire is decreased to one third if volume remains the same length will increase
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A. 3 times

B. 1 Time

C. 6 times

D. 9 times
1334. A wooden box of dimensions 8m x 7m x 6m is to carry rectangular boxes of dimensions 8cm x 7cm x 6cm. The maximum number of boxes that can be carried in 1 wooden box is?
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A. 9800000

B. 1000000

C. 7500000

D. 1200000

1335. If a number is chosen at random from the set {1, 2, 3, ., 100}, then the probability that the chosen number is a perfect cube is___________?
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A. 1/25

B. 2-Jan

C. 10-Jan

D. 13-Apr

1336. One root of the quadratic equation x<sup>2
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A. 27

B. 7

C. 29

D. 28

1337. A tank 3 m long, 2 m wide and 1.5 m deep is dug in a field 20 m long and 14 m wide. If the earth dug out is evenly spread out over the field, the level of the field will raise by nearly?
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A. 2.98 cm

B. 0.299 cm

C. 0.29 cm

D. 4.15 cm

1338. The number of solid spheres each of diameter 6 cm, that could be moulded to form a solid metal cylinder of height 45 cm and diameter 4 cm is?
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A. 6

B. 4

C. 5

D. 3

1339. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?
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A. 21-Apr

B. 2/21

C. 14-Jan

D. 22-Mar

1340. A cistern has three pipes, A, B and C. The pipes A and B can fill it in 4 and 5 hours respectively and C can empty it in 2 hours. If the pipes are opened in order at 1, 2 and 3 A.M. When will the cistern be empty?
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A. 4:00 PM

B. 3:00 PM

C. 5 PM

D. 7:00 PM