mathematics MCQs – Page 72

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 Review each marked answer and report any item that may be outdated or unclear.

mathematics Mcqs

1421. H.C.F of 3240, 3600 and a third number is 36 and their L.C.M is 24
0

A. 22* 35* 72

B. 22* 53* 72

C. 25* 52* 72

D. 23* 35* 72

1422. A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?
0

A. Jan-91

B. 2/455

C. 4/455

D. 1/455

1423. The ratio of the volumes of two cubes is 729 : 1331. What is the ratio of their total surface areas?
0

A. 9:11

B. 81 : 121

C. 27:12:00

D. 729 : 1331

1424. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________?
0

A. 20 kg

B. 26 kg

C. 31 kg

D. 17 kg

1425. The area of the square formed on the diagonal of a rectangle as its side is 108 1/3 % more than the area of the rectangle. If the perimeter of the rectangle is 28 units, find the difference between the sides of the rectangle?
0

A. 8

B. 6

C. 2

D. 12

1426. A cistern is filled by a tap in 3 1/2 hours. Due to leak in the bottom of the cistern, it takes half an hour longer to fill the cistern. If the cistern is full how long will it take the leak to empty it?
0

A. 14 hours

B. 8 hours

C. 28 hours

D. 7 hours

1427. A card is drawn from a pack of 52 cards. The probability of getting a queen of club or a king of heart is___________?
0

A. Jan-52

B. 13-Feb

C. 1/26

D. 13-Jan

1428. The slant height of a cone is 12 cm and radius of the base is 4cm, find the curved surface of the cone.
0

A. 48 ? cm2

B. 74 ? cm2

C. 36 ? cm2

D. 24 ? cm2

1429. The radius of a cylinder is 2 r units and height is 3 r units. Find the curved surface?
0

A. 6 ?r2sq units

B. 3 ?r2sq units

C. 18 ?r2sq units

D. 12 ?r2sq units

1430. Two pipes can separately fill a tank in 20 and 30 hours respectively. Both the pipes are opened to fill the tank but when the tank is full, a leak develops in the tank through which one-third of water supplied by both the pipes goes out. What is the total time taken to fill the tank?
0

A. 18 hrs

B. 16 hrs

C. 12 hrs

D. 15 hrs

1431. A large tanker can be filled by two pipes A and B in 60 and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?
0

A. 30 min

B. 20 min

C. 27.5 min

D. 15 min

1432. The probability that A speaks truth is 3/5 and that of B speaking truth is 4/7. What is the probability that they agree in stating the same fact?
0

A. 17/35

B. 19/35

C. Dec-35

D. 18/35

1433. I. x2
0

A. If x > y

B. If x < y

C. If x = y or the relationship between x and y cannot be established.

D. If x ? y

E. If x ? y

1434. What is the are of an equilateral triangle of side 16 cm?
0

A. 128?3 cm2

B. 48?3 cm2

C. 64?3 cm2

D. 9.6?3 cm2

1435. In a drawer there are 4 white socks, 3 blue socks and 5 grey socks. Two socks are picked randomly. What is the possibility that both the socks are of same color?
0

A. 19/66

B. 11-Apr

C. 1

D. Feb-33

1436. How many meters of carpet 50cm, wide will be required to cover the floor of a room 30m * 20m?
0

A. 1200

B. 2400

C. 600

D. 1000

1437. The sum and the product of the roots of the quadratic equation x(power 2) + 20x + 3 = 0 are?
0

A. -10, 3

B. -20, 3

C. 10, 3

D. -10, -3

1438. A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.
0

A. 7/15

B. 5-Mar

C. 5-Feb

D. 15-Aug

1439. The G.C.D of 1.08, 0.36 and 0.9 is________?
0

A. 0.9

B. 0.108

C. 0.18

D. 0.03

1440. A tank is filled in eight hours by three pipes A, B and C. Pipe A is twice as fast as pipe B, and B is twice as fast as C. How much time will pipe B alone take to fill the tank?
0

A. 24 hours

B. 36 hours

C. 28 hours

D. 32 hours

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