An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object.
[g = 10 ms2]
- A. 50 N
- B. 520 N
- C. 220 N
- D. 80 N
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. fall below the liquid level if the liquid wets the glass
- C. falls below the liquid level if the liquid does not wet the glass
- D. rise above the liquid level if the liquid does not wet the glass
A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?
[g = 10 ms-2]
- A. 600 J
- B. 150J
- C. 300 J
- D. 450 J
An object of mass 2 kg moves with a velocity of 10 ms1 round at circle of radius 4 m. Calculate the centripetal force on the object
- A. 25 N
- B. 100 N
- C. 50 N
- D. 40 N
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
Two balls X and Y weighing 5 g and 50 kg respectively were thrown up vertically at the same time with a velocity of 100 ms1 .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
- C. X will be 500 m ahead of Y
- D. X and Y both be 500 m from the point of throw
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. the lift's acceleration is same as acceleration due to gravity
- D. there is no gravitational pull on the man in the lift