physics

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?

A. Translational motion B. rotational motion C. brownian motion D. oscillatory motion Correct Answer: Option C C. brownian motion

6 years ago

A body starts from rest and accelerates uniformly at 5ms-1 until it attains a velocity of 25ms-1. Calculate the time taken to attain this velocity

A. 2.5s B. 5.0s C. 10.0s D. 125.0s Correct Answer: Option B B. 5.0s Explanation V = u + at…

6 years ago

Which of the following type of motion does a body undergo when acted upon by a couple?

A. vibrational B. translational C. rotational D. random Correct Answer: Option C C. rotational

6 years ago

Masses, m¹ and m² at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m²: m¹

A. 2 : 1 B. 3 : 3 C. 2 : 3 D. 1 : 2 Correct Answer: Option D…

6 years ago

A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine

A. 85% B. 80% C. 60% D. 20% Correct Answer: Option B B. 80%

6 years ago

Which of the following simple machines is a second class lever?

A. wheelbarrow B. crowbar C. claw hammer D. seesaw Correct Answer: Option A A. wheelbarrow

6 years ago

Determine the magnitude of P in the diagram below.

A. 16N B. 20N C. 32N D. 40N Correct Answer: Option C C. 32N Explanation X = 50 sin30 =…

6 years ago

The diagram above shows the speed-time graph of a car. If the car covered a total distance of 600m in 25s, calculate its maximum speed.

A. 30ms-1 B. 25ms-1 C. 20ms-1 D. 15ms-1 Correct Answer: Option A A. 30ms-1 Explanation S = ½(a+b)h 60 =…

6 years ago

Fusion is not usually used for generating electric power because?

A. no energy is released when fusion takes place B. very high temperatures are required to initiate fusion reaction C.…

6 years ago

A radioactive substance of mass 768g has a half-life of 3 years. After how many years does this substance leave only 6g undecayed?

A. 21 B. 18 C. 15 D. 12 Correct Answer: Option A A. 21 Explanation 768→384→192→96→48→24→12→6 7 x 3 =…

6 years ago
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