mathematics MCQs – Page 69

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 Review each marked answer and report any item that may be outdated or unclear.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

1361. The average salary of all the workers in a workshop is Rs. 8000. The average salary of 7 technicians is Rs. 12000 and the average salary of the rest is Rs. 6000. The total number of workers in the workshop is__________________?
0

A. 21

B. 22

C. 23

D. 20

1362. 10 books are placed at random in a shelf. The probability that a pair of books will always be together is_________?
0

A. 10-Sep

B. 10-Mar

C. 10-Jan

D. 1/5

1363. The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years. The age of the 15th student is____________?
0

A. 15 years

B. 11 years

C. 15 2/7 years

D. 14 years

1364. A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that at least one bulb is good.
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A. Feb-63

B. 125/126

C. 1/126

D. Jun-63

1365. The surface area of a cube is 726m2
0

A. 1300 m3

B. 1542 m3

C. 1452 m3

D. 1331 m3

1366. A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
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A. 20 hrs

B. Cannot be determined

C. 35 hrs

D. 25 hrs

1367. The curved surface of a sphere is 64 ? cm2
0

A. 2 cm

B. 3 cm

C. 1 cm

D. 4 cm

1368. What is probability of drawing two clubs from a well shuffled pack of 52 cards?
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A. 13/17

B. 13/51

C. 1/17

D. 26-Jan

1369. Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours. C is closed A and B can fill the remaining par in 7 hours. The number of hours taken by C alone to fill the tank is?
0

A. 16

B. 12

C. 14

D. 10

1370. Two pipes P and Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?
0

A. 11 1/4 min

B. 9 1/4 min

C. 8 1/2 min

D. 7 1/4 min

1371. A top can fill a cistern in 8 hours and another can empty it in 16 hours. If both the taps are opened simultaneously the time (in hours) to fill the tank is
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A. 16

B. 24

C. 10

D. 8

1372. The parameter of a square is double the perimeter of a rectangle. The area of the rectangle is 480 sq cm. Find the area of the square.
0

A. 200 sq cm

B. Cannot be determined

C. 162 sq cm

D. 72 sq cm

1373. Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the pipe B is turned off after?
0

A. 5 min

B. 9 min

C. 10 min

D. 15 min

1374. I. a2
0

A. If a ? b.

B. If a ? b

C. If a < b

D. If a > b

1375. A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
0

A. 3 hrs 15 min

B. 4 hrs

C. 4 hrs 15 min

D. 3 hrs 45 min

1376. The height of two right circular cones are in the ratio 1:2 and their perimeters of their bases are in the ratio 3:4, the ratio of their volume is_________?
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A. 9:16

B. 9:32

C. 3:08

D. 0.419444444

1377. The radius of the base of cone is 3 cm and height is 4 cm. Find the volume of the cone?
0

A. 8 ? cm3

B. 6 ? cm3

C. 12 ? cm3

D. 10 ? cm3

1378. If a solid sphere of radius 10 cms is moulded into 8 spherical solid balls of equal radius, then surface area of each ball (in cm2
0

A. 60?

B. 7?

C. 100?

D. 50?

1379. The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4?
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A. 4

B. 76

C. 70

D. 2

1380. I. x2
0

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

B. If x < y

C. If x ? y

D. If x > y

E. If x ? y

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