A particle starts with a velocity 2m/sec and moves on a straight line track with retardation 0.1 m/sec2. The time at which the particle is 15m from the starting point would be

1.  10 sec

2.  20 sec

3.  50 sec

4.  40 sec

View Answer  
4
Correct Answer :

10 sec


Explanation :
No Explanation available for this question

A car moving with speed u can be stopped minimum distance x when brakes are applied. If the speed becomes n times, the minimum distance over which the car can be stopped would take the value

1.  x/n

2.  nx

3.  x/n2

4.  n2x

View Answer  
4
Correct Answer :

n2x


Explanation :
No Explanation available for this question

A train accelerates from rest at a constant rate α for some time and then it retards to rest at constant rate β.”If total distance covered by the train x, maximum velocity attained by the train x, maximum velocity attained by the train during course of its motion would be

1.  [α+β/2αβ]1/2x

2.  [2αβ/α+β]1/2x

3.  [α+β/α-β]1/2x

4.  [2αβ/α-β]1/2x

View Answer  
4
Correct Answer :

[2αβ/α+β]1/2x


Explanation :
No Explanation available for this question

The combined motion of rotation and translation may be assumed to be motion of pure rotation about some centre which goes on changing from time to time. The centre in question is known as

1.  shear centre

2.  meta centre

3.  instantaneous centre

4.  gravitational centre

View Answer  
4
Correct Answer :

instantaneous centre


Explanation :
No Explanation available for this question

Two balls are dropped from the same point after an interval of one second. if acceleration due to gravity is 10 m/sec2, their separation 3 seconds after the release of first ball would be

1.  15m

2.  20 m

3.  25 m

4.  30 m

View Answer  
4
Correct Answer :

25 m


Explanation :
No Explanation available for this question

Two bodies of mass m1 and m2 are dropped from different heights h1 and h2 respectively. Neglecting the effect of friction, the ratio of times taken to drop though the given heights would be

1.  m1/m2

2.  m2h2/m1h1

3.  (h1/h2)1/2

4.  (h1/h2)2

View Answer  
4
Correct Answer :

(h1/h2)1/2


Explanation :
No Explanation available for this question

A stone falls freely from rest and the distance covered by it in the last seconds of its motion equals the distance covered by it in the first four seconds of its motion. The stone then remains in air for a total period of (Take g=10m/sec2)

1.  6 sec

2.  8.5 sec

3.  10.5sec

4.  12.5sec

View Answer  
4
Correct Answer :

8.5 sec


Explanation :
No Explanation available for this question

A small block of mass m is sliding on a rough horizontal plane at velocity v0.If the velocity is reduced to v0/2 in 30 meters, the block will be brought to rest in the next

1.  10m

2.  20m

3.  25m

4.  30m

View Answer  
4
Correct Answer :

10m


Explanation :
No Explanation available for this question

A block slides down a smooth inclined plane in time t after having been released from its top an identical block on being released from the same pointed and falling freely will reach the ground in time

1.  t/3

2.  t/√3

3.  t/2

4.  t/3

View Answer  
4
Correct Answer :

t/2


Explanation :
No Explanation available for this question

A motor bike starts from rest and accelerates at a rate of 4m/sec2 for 10 seconds and then decelerates at 8m/sec2 until it stops. The total distance covered is

1.  100m

2.  200m

3.  300m

4.  500m

View Answer  
4
Correct Answer :

300m


Explanation :
No Explanation available for this question
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