Consider a one-dimensional elastic collision between an incoming body A of mass m1 and a body B of mass m2 initially at rest. For body B to move with greatest kinetic energy after collision

1.  m1> m2

2.  m1

3.  m1=m2

4.  none of these

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4
Correct Answer :

m1> m2


Explanation :
No Explanation available for this question

Two objects having masses of 5kg and 10kg have initial velocities of 2m/sec in the +x direction and 1m/sec in the +y direction respectively. After collision they stick together and move at an angle of 450 to the x-axis. Their combined final velocity is

1.  2/3 √2 m/sec

2.  2/3 √3 m/sec

3.  2 √3 m/sec

4.  3 √2 m/sec

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4
Correct Answer :

2/3 √2 m/sec


Explanation :
No Explanation available for this question

Two identical masses A and B are suspended by an inextensible string passing over a smooth frictionless pulley. At a particular instant, the masses are at rest. The mass B is then given a push downwards. It moves downwards with speed V, strikes the floor and rebounds. Immediately after collision

1.  Both A and B move upwards with same speed

2.  Both A and B move upwards with unequal speeds

3.  A moves downwards and B moves upward with equal speeds

4.  Both remains stationary

View Answer  
4
Correct Answer :

Both A and B move upwards with same speed


Explanation :
No Explanation available for this question

The force of 400 N acting on the level can be replaced by which of the following

1.  A force of 400 N at O

2.  A couple of 69.3 N-m at O

3.  A force of 400 N at O and a couple of 69.3 N-m at O

4.  A couple of 69.3 N –m at O

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4
Correct Answer :

A force of 400 N at O


Explanation :
No Explanation available for this question

A body of mass 10kg moving with a velocity of 1m/s is acted upon by a force of 50 N for two  seconds. The final velocity will be

1.  11m/sec

2.  22m/sec

3.  10m/sec

4.  √21m/sec

View Answer  
4
Correct Answer :

√21m/sec


Explanation :
No Explanation available for this question

A force f acts for one second on a body of mass 1kg. moving with an initial velocity u. Then which of the following statements is/are not true

1.  Body covers a distance (u + f/2)

2.  Final velocity of the body is (u+f)

3.  Change in kinetic energy of body is ½ mf2

4.  Momentum of the body increases by f

View Answer  
4
Correct Answer :

Change in kinetic energy of body is ½ mf2


Explanation :
No Explanation available for this question

A uniform chain of mass m and length 1 lies on a smooth table such that one-fourth of its length is hanging vertically down over the edge of the table. Work done to full the hanging part of the chain on the table is:

1.  mgl

2.  mgl /4

3.   mgl/16

4.  mgl/32

View Answer  
4
Correct Answer :

mgl/32


Explanation :
No Explanation available for this question

The end of a flexible but inextensible rope of length L and mass P per unit length which is pulled on the platform is lifted vertically with a constant velocity ν by a variable force P. The variable force P is given by

1.  P= ρν2

2.  P= ½ ρν2

3.  P= ½ ρν2 + ρgx

4.  P= ½ ρν2 + ρgx + ρgL

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4
Correct Answer :

P= ½ ρν2 + ρgx


Explanation :
No Explanation available for this question

An engine delivers constant power while driving a vehicle along a straight level and frictionless road. The distance travelled by the car in time t would be a function of

1.  t1/2

2.  t

3.  t3/2

4.  t/2

View Answer  
4
Correct Answer :

t3/2


Explanation :
No Explanation available for this question

An engine delivers constant power while driving a vehicle along a straight level and frictionless road. The distance travelled by the car in time t would be a function of

1.  t1/2

2.  t

3.  t3/2 t/2

4.  

5.  

View Answer  
5
Correct Answer :

t3/2

t/2


Explanation :
No Explanation available for this question
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