A mechanic wheel tracks 3000 revolutions to bridge a course distance of 2640 meters. Find the radius size of the wheel. MCQ with Answer and Explanation

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A mechanic wheel tracks 3000 revolutions to bridge a course distance of 2640 meters. Find the radius size of the wheel.

A. 12 cm

B. 16 cm

C. 18 cm

D. 14 cm

Answer: Option D

Solution (By JKSSB Mock Tests)

Distance wrapped in 1 turn revolution = 2640 / 3000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm.

This question belongs to: Maths Time Speed and Distance

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Question #1

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A motorboat covers 24 km downstream in 1.5 hours and covers the same distance upstream in 3 hours. Find the speed of the boat in still water.

A. 12 km/h

B. 15 km/h

C. 14 km/h

D. 10 km/h

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Correct Answer: Option A

Explanation:
Downstream speed = 24 / 1.5 = 16 km/h. Upstream speed = 24 / 3 = 8 km/h. Speed in still water = (16 + 8) / 2 = 12 km/h.

This question belongs to: Maths Time Speed and Distance

Question #2

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A car covered a distance of 240 km in 4 hours. If it decreases its speed by 10 km/h, how much time will it take to cover a distance of 300 km?

A. 5 hours

B. 5.5 hours

C. 6.5 hours

D. 6 hours

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Correct Answer: Option D

Explanation:
Original speed = 240 / 4 = 60 km/h. New speed = 60 - 10 = 50 km/h. Time for 300 km = 300 / 50 = 6 hours.

This question belongs to: Maths Time Speed and Distance

Question #3

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A cyclist tracks 1200 meters in exactly 4 minutes. Find his speed index in km/h.

A. 20 km/h

B. 15 km/h

C. 18 km/h

D. 22 km/h

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Correct Answer: Option C

Explanation:
Time = 4 minutes = 240 seconds. Speed = 1200 / 240 = 5 m/s. In km/h = 5 * (18/5) = 18 km/h.

This question belongs to: Maths Time Speed and Distance

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