PHYSICS : REVISION TEST ON TOPICS OF CLASS XI --XIII

A body is moving with a velocity 1 m/s and a force F is needed to stop it within a certain distance. If the speed of the body becomes three times, the force needed to stop it within same distance would be
1.5 F
3 F
6 F
9 F
A bullet of mass m1 and moving with velocity v1 strikes a wooden block of mass m2 lying on a frictionless surface and gets embedded into it. The final velocity of the system is
(m1 + m2) v1
m1/m1 + m2 v1
m1 + m2/m1 v1
m1/(m1 + m2) v1
A body of mass m moving towards right with a constant velocity v hits another body of twice the mass moving towards left with half the velocity. If they stick together on collision, they will
come to rest
move towards right
move towards left
can come to rest or move in any direction depending upon magnitude of masses and their velocities
A force f acts for one second on a body of mass 1 kg moving with an initial velocity u. Then which of the following state
Body covers a distance (u + f/2)
Final velocity of the body is (u + f)
Change in kinetic energy of body is 1/2m f2
Momentum of the body increases of f
A rope weighing 0.5 kgf per metre run hangs from a drum for a height of 10 m. The work done in winding up the rope on the drum is
5 mkgf
10 mkgf
25 mkgf
50 mkgf
An engine delivers constant power while driving a vehicle along a straight, level and frictionless road. The distance traveled by the car in time t would be a function of
t1/2
t3/4
t3/2
t2
/
25 mkgf
40 mkgf
60 mkgf
75 mkgf
For the mass-pulley system depicted in Fig. 1.42, the mass m2 = 5 kg is placed on a smooth inclined plane of inclination a where as the mass m1 = 5 kg is hanging free. The acceleration of the system is 1.5 m/s2. If each mass is doubled, the acceleration will be
0.75 m/s2
1.5 m/s2
3.0 m/s2
A man stands on a spring weighing scale in a lift which carries him upwards with acceleration. The reading on the weighing scale will be
true weight of the man
lower than the true weight
greater than the true weight
zero
The apparent weight of a man in a lift is less than the real weight when the lift is going down
freely
under the force of gravity
with some constant velocity
with some acceleration
Description:

TO[PICS: FORCE, COLLISION

Discussion
Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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