physics

A copper wire was subjected to a tensile stress of 7.7 x 10^7 x 10 Nm−². Calculate strain of the wire. [young modules = 1.1 x 10¹¹ Nm−²]

A. 2. 0 x 10^-5 B. 7.0 x 10^-3 C. 7.0 x 10^-4 D. 2.2 x 10^-4 Correct Answer: Option…

5 years ago

A metal of volume 40 cm³ is heated from 30°C to 90°C; the increase in volume is?

A. 0.12 cm³ B. 4.00 cm³ C. 1.20 cm³ D. 0.40 cm³ E. no correct option Correct Answer: Option E…

5 years ago

An object weighs 22kg in water and 30kg in air. What is the Upthrust exerted by the liquid on the object? [g = 10 ms−²]

A. 50 N B. 520 N C. 220 N D. 80 N Correct Answer: Option D - 80 N Explanation…

5 years ago

If a tube of small radius opened at both ends is placed in a liquid, the liquid will?

A. remain at the same level irrespective of whether the liquid wet the glass or not B. falls below the…

5 years ago

A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is? [g = 10 ms−²]

A. 600J B. 150J C. 300J D. 450J Correct Answer: Option C - 300J Explanation K.E just before hitting the…

5 years ago

An object of mass 2 kg moves with a velocity of 10 ms−¹ round a circle of radius 4m. Calculate the centripetal force on the object?

A. 25 N B. 100 N C. 50 N D. 40 N Correct Answer:0o, Option C = 50 N Explanation…

5 years ago

If it takes an object 3s to fall freely to the ground from a certain height; what is the distance covered by the object?

A. 90 m B. 30 m C. 45 m D. 60 m Correct Answer: Option C - 45 m Explanation…

5 years ago

Two balls X and Y weighing 5g and 50kg respectively were throne up vertically at the same time with a velocity of 100m/s¹. How will their positions be one second later?

A. X and Y will be 500 m from each other B. Y will be 500 m ahead of X…

5 years ago

A man standing on a lift that is descending does not feel any weight because?

A. the inside of the lift is air tight B. the lift is in vacuum C. there is no reaction…

5 years ago

The energy of a photo having a wavelength of 10^-10m is (h= 6.63 x 10^-34Js, c =3.0 x 10^8ms-1)

A. 2 x 10-15J B. 1.7 x 10 -13J C. 2.0 x 10 -12J D. 1.7 x 10 -12J Correct Answer: Option A…

5 years ago
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