# 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.

4

Explanation :
No Explanation available for this question

# Two vectors areand .The angle between resultant vector andis

1.

2.

3.

4.  zero

4

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%

4

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

4

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

4

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

4

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

Explanation :
No Explanation available for this question

# 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

4

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

4

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

4

&#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

4

&#8730;0.6 R

Explanation :
No Explanation available for this question

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