A ball is dropped into a well. The water level in the well is at a depth 'h' below the top. If the speed of sound is v, then after the what time the splash of sound is heard

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Two vectors areand .The angle between resultant vector andis

1.  

2.  

3.  

4.  zero

View Answer  
4
Correct Answer :

zero


Explanation :
No Explanation available for this question

A body weights 22.42 gm and has a measured volume of 4.7 cc. The possible error in the measurement of the mass and volume are 0.01 gm and 0.1 cc. Then the maximum error percentage in the density will be:

1.  22%

2.  2.2%

3.  0.22%

4.  0.022%

View Answer  
4
Correct Answer :

2.2\%


Explanation :
No Explanation available for this question

A man moves 20 m north, then 10 m east and then 10√2 m south-west, his displacement is:

1.  20 m north

2.  10 √2 m north-west

3.  10 √2 m south-east

4.  10 m north

View Answer  
4
Correct Answer :

10 m north


Explanation :
No Explanation available for this question

An electron moving at a speed of 5 x 106 ms-1 is shot through a sheet of paper which is 2.1 x 10-4 cm think. The electron emerges from the paper with speed of 2 x 106 ms-1. The time taken by the electron in seconds to pass through the paper sheet is:

1.  5 x 10-12

2.  6 x 10-13

3.  3 x 10-12

4.  5 x 10-13

View Answer  
4
Correct Answer :

6 x 10<sup>-13</sup><br><sup></sup>


Explanation :
No Explanation available for this question

The kinetic energy K of a particle of mass 'm' moving along a circle of radius 'R' depends on distance covered 'S' as K= AS2. Then the acceleration of particle is given by:

1.  2AS/m (1 + S2/R2)1/2

2.  2AS/m (1 - S2/R2)1/2

3.  2AS2/mR

4.  2AS/m

View Answer  
4
Correct Answer :

2AS/m (1 + S<sup>2</sup>/R<sup>2</sup>)<sup>1/2</sup>


Explanation :
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A sphere of mass m moving with constant velocity hits another stationary sphere of same mass. If 'e' is the coefficient of restitution, then the ratio of velocities of the two spheres after the collision will be:

1.  1 / e

2.  1-e / 1+e

3.  e / 1+e

4.  e+1 / e

View Answer  
4
Correct Answer :

1-e / 1+e


Explanation :
No Explanation available for this question

Two particles A and B initially at rest move towards each other under a mutual force of attraction. At the instant when the velocity of A is V and that of B is 2V, the velocity of centre of mass of the system is:

1.  Zero

2.  V

3.  2V

4.  3V

View Answer  
4
Correct Answer :

Zero


Explanation :
No Explanation available for this question

A car is travelling along a curved road of radius r. If the coefficient of friction between the tyres and the road is μ, the car will skid if its speed exceeds:

1.  2√μrg)

2.  √3μrg

3.  √2μrg

4.  √μrg

View Answer  
4
Correct Answer :

&#8730;&#956;rg


Explanation :
No Explanation available for this question

The radius of gyration of a solid sphere of radius R about a certain axis is also equal to R. If r is the distance between the axis and the centre of the sphere, then r =

1.  R

2.  0.5R

3.  √0.6 R

4.  zero

View Answer  
4
Correct Answer :

&#8730;0.6 R


Explanation :
No Explanation available for this question
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