mathematics MCQs – Page 68

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 Review each marked answer and report any item that may be outdated or unclear.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

1341. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?
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A. 100 gallons

B. 60 gallons

C. 120 gallons

D. 180 gallons

1342. Find the quadratic equations whose roots are the reciprocals of the roots of 2x2
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A. 3x2 5x + 2 = 0

B. 3x2+ 5x 2 = 0

C. 3x2+ 5x + 2 = 0

D. 3x2 5x 2 = 0

1343. 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___________?
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A. 31 kg

B. 26 kg

C. 17 kg

D. 20 kg

1344. Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?
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A. 23 min

B. 7 min

C. 9 min

D. 13 min

1345. The edge of a cube is 2a cm. Find its surface?
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A. 24a2cm2

B. 6a2cm2

C. 12a2cm2

D. 8a2cm2

1346. The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average of the team?
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A. 25 years

B. 23 years

C. None of these

D. 24 years

1347. Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is_____________?
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A. 2-Jan

B. 16/19

C. 17/20

D. 5-Apr

1348. The diameters of two spheres are in the ratio 1:2 what is the ratio of their surface area?
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A. 4:01

B. 1:02

C. 1:4

D. 2:01

1349. The area of a square is 4096 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is twice the side of the square and breadth is 24 cm less than the side of the square.
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A. None of these

B. 7:16

C. 5:14

D. 18:05

1350. The sector of a circle has radius of 21 cm and central angle 135o. Find its perimeter?
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A. 91.5 cm

B. 92.5 cm

C. 93.5 cm

D. 94.5 cm

1351. Three cubes of metal whose edges are 9, 12 and 15 cm respectively, are melted and one new cube is made. Find the edge of the new cube?
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A. 18 cm

B. 19 cm

C. 21 cm

D. 32 cm

1352. The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of P is____________?
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A. Rs. 4050

B. Rs. 4000

C. Rs. 5000

D. Rs. 3500

1353. The probability of a lottery ticket being a prized ticket is 0.2. When 4 tickets are purchased, the probability of winning a prize on at least one ticket is__________?
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A. 0.5904

B. 0.6234

C. 0.5834

D. 0.4869

1354. If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is__________?
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A. 5-Mar

B. 4-Mar

C. 1/2

D. 4-Jan

1355. In digging a pond 20 m * 10 m * 5 m the volumes of the soil extracted will be_________?
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A. 1000 cu.m

B. 2000 cu.m

C. 100 cu.m

D. 10000 cu.m

1356. From a pack of cards two cards are drawn one after the other, with replacement. The probability that the first is a red card and the second is a king is_________?
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A. 1/26

B. 15/26

C. Mar-52

D. 26-Nov

1357. The ratio of the length and the breadth of a rectangle is 4 : 3 and the area of the rectangle is 6912 sq cm. Find the ratio of the breadth and the area of the rectangle?
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A. 0.1

B. 1:48

C. 1 : 96

D. 0.088888889

1358. Two pipes A and B can fill a tank in 4 and 5 hours respectively. If they are turned up alternately for one hour each, the time taken to fill the tank is?
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A. 3 hrs

B. 4 hrs 24 min

C. 5 hrs

D. 2 hrs 15 min

1359. Surface area of a sphere is 2464 cm2. If its radius is doubled, then the surface area of _________?the new sphere will be
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A. 9856 cm2

B. 4727 cm2

C. 19712 cm2

D. 4920 cm2

1360. The edge of three cubes of metal is 3 dm, 4 dm and 5 dm. They are melted and formed into a single cube. Find the edge of the new cube?
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A. 5 dm

B. 6 dm

C. 4 dm

D. 3 dm

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