physics

Calculate the length which corresponds to a temperature of 20°C if the ice and steam points of an unguarded thermometer are 400 mm apart?

A. 20mm B. 30mm C. 60mm D. 80mm Correct Answer: Option D - 80mm Explanation At 100°C = 400 Therefore,…

5 years ago

What volume of alcohol will have same mass as 4.2m³ of petrol? Density of alcohol = 8.4 x 102kgm−³, density of petrol =7.2x103kgm−³

A. 0.8m³ B. 1.4m³ C. 3.6m³ D. 49m³ Correct Answer: Option C - 3.6m³ Explanation Mp = ep x Vp…

5 years ago

Calculate the work done when a force of 20N stretches a spring by 50mm.

A. 0.5J B. 1.5J C. 2.0J D. 2.5J Correct Answer: Option A - 0.5J Explanation W = ½Fe W =…

5 years ago

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

A. 80N B. 90N C. 100N D. 120N Correct Answer: Option C - 100N Explanation M.A. = Eff×V.R/100 M.A. =…

5 years ago

The coefficient of friction between two perfectly smooth surface is?

A. infinity B. one C. half D. zero Correct Answer: Option D - zero

5 years ago

If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is

A. 2.25 x 10^5js−¹ B. 2.5 x 10^4js−¹ C. 3.3 x 10^3js−¹ D. 3.3 x 10^2js−¹ Correct Answer: Option C…

5 years ago

An object is moving with a velocity of 5ms−¹. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

A. 25.0m B. 20.0m C. 1.3m D. 1.0m Correct Answer: Option C - 1.3m Explanation P.E = K.E Therefore, h…

5 years ago

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 10³kgm−³, Density of the liquid = 1.25 x 10³kgm−³]

A. 0.8 B. 0.5 C. 0.2 D. 0.1 Correct Answer: Option C = 0.2 Explanation 0.25×10³/1.25×10³ = 0.2

5 years ago

Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms−² [g = 10ms−²].

A. 686N B. 595N C. 581N D. 105N Correct Answer: Option D - 105N Explanation Wt loss = mg -…

5 years ago

A train with an initial velocity of 20ms−¹ is subjected to a uniform deceleration of 2m−². The time required to bring the train to a complete halt is?

A. 5s B. 10s C. 20s D. 40s Correct Answer: Option B = 10s Explanation t = v−u/a = 0−20/−2…

5 years ago
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