# The angular momentum of a system is conserved if there

1.  are no forces present

2.  are no magnetic forces present

3.  is no net force on the system

4.  are no torques present

4

are no torques present

Explanation :
No Explanation available for this question

# A body moves   along a straight line and the variation of its kinetic energy with time is linear as depicted in the figure below

1.  The force acting on the body is

2.  directly proportional to velocity

3.  inversely proportional to velocity

4.  zero constant

4

directly proportional to velocity

Explanation :
No Explanation available for this question

# A body moves   along a straight line and the variation of its kinetic energy with time is linear as depicted in the figure below

1.  The force acting on the body is

2.  directly proportional to velocity

3.  inversely proportional to velocity

4.  zero constant

4

directly proportional to velocity

Explanation :
No Explanation available for this question

# A body of 2Kg mass makes an elastic collection with another body at rest and afterwards continues  to move in the original direction but with one fourth of its original speed.The mass of the struck body is

1.  1.2 kg

2.  1.0 kg

3.  0.6 kg

4.  0.2 kg

4

1.2 kg

Explanation :
No Explanation available for this question

# A cube strikes a billiard ball, exerting an average force of 50N over time of 10 milliseconds. If the ball has mass 0.20 kg, its speed after the impact will be

1.  0.5m/s

2.  1.5m/s

3.  2.5m/s

4.  5.0m/s

4

2.5m/s

Explanation :
No Explanation available for this question

# A ball weighing 0.01kghits a hard surface vertically with a speed of 5m.s and rebound with the same speed. The ball remains in contact with the surface for 0.01 second. The average force exerted by the surface on the ball is

1.  0.1N

2.  1N

3.  8N

4.  10N

4

10N

Explanation :
No Explanation available for this question

# The 10 kg block is moving to the right at 6m/s when the 360N/m spring is unstretched. If  the horizontal plane is frictionless, the block will first come to rest in

1.  0.5m

2.  0.75m

3.  1.0m

4.  1.25m

4

1.0m

Explanation :
No Explanation available for this question

# Three different balls of masses m1, m2 and m3 are allowed to roll from rest along three different frictionless paths OP, OQ and OR respectively from point O whose vertical height above the ground is h. The respective speeds v1, v2 and v3 at P, Q and R will be such that

1.  v1 = v2= v3

2.  v1< v2< v3

3.  v1> v2> v3

4.  v1/m1 = v2/m2 = v3/m3

4

v1 = v2= v3

Explanation :
No Explanation available for this question

# For perfectly elastic bodies, the value of coefficient of restitution is

1.  1

2.  0.5 to 1

3.  0 to 0.5

4.  Zero

4

1

Explanation :
No Explanation available for this question

1.  5 m/sec

2.  10m/sec

3.  Zero

4.  2.5 m/sec

4