Physics

NEET Class 12

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1.

A body of mass m is moving towards the east and another body of equal mass is moving towards the north. If after collision both stick together, their speed after collision would be :

v

v/2

$\sqrt{2}{\mathrm{v}}$

$\frac{\mathrm{v}}{\sqrt{2}}$

2.

A body of mass 1 kg is moving in a vertical circular path of radius 1 m. The difference between the kinetic energies at its highest and lowest position is :

20 J

10 J

${4}\sqrt{5}{}{\mathrm{J}}$

10($\sqrt{5}$ - 1) J

3.

Two bodies are thrown up at angles of 40° and 60°, respectively, with the horizontal. If both bodies attain the same vertical height, then the ratio of velocities with which these are thrown is:

$\sqrt{\frac{2}{3}}$

$\frac{2}{\sqrt{3}}$

$\sqrt{\frac{3}{2}}$

$\frac{\sqrt{3}}{2}$

4.

Escape velocity from a planet is v, If its mass is increased to 8 times and its radius is increased to 2 times, then the new escape velocity would be :

v

_{e}$\sqrt{2}$v

_{e}2v

_{e}${2}\sqrt{2}$v

_{e}

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5.

A body takes time t to reach the bottom of an inclined plane of angle 0 with the horizontal. If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is:

$\frac{3}{4}{\mathrm{tan\theta}}$

$\frac{2}{3}{\mathrm{tan\theta}}$

$\frac{1}{4}{\mathrm{tan\theta}}$

$\frac{1}{2}{\mathrm{tan\theta}}$

6.

Acceleration due to gravity:

decreases from the equator to poles

decreases from poles to the equator

is maximum at the centre of the earth

is maximum at the equator

7.

Two bodies having masses m_{1} = 40g and m_{2} = 60 g are attached to the ends of a string of negligible mass and suspended from a massless pulley. The acceleration of the bodies is:

1 m/s

^{2}2 m/s

^{2}0.4 m/s

^{2}4 m/s

^{2}

8.

A block is moving up an inclined plane of inclination 60° with a velocity of 20 m/s and stops after 2 s. If g = 20 m/s^{2} then the approximate value of the coefficient of friction is :

3

3.3

0.27

0.33

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9.

A coin placed on a rotating turntable just slips if it is placed at a distance of 8 cm from the centre. If angular velocity of the turntable is doubled, it will just slip at a distance of :

1 cm

2 cm

4 cm

8 cm

10.

When a man increases his speed by 2 m/s, he finds that his kinetic energy is doubled, the original speed of the man is :

${2}{(}\sqrt{2}{}{-}{}{1}{)}{}{\mathrm{m}}{/}{\mathrm{s}}$

${2}{(}\sqrt{2}{}{+}{}{1}{)}{}{\mathrm{m}}{/}{\mathrm{s}}$

4.5 m/s

none of these

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