Physics

NEET Class 12

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1.

If a_{r} and a_{t} represent radial and tangential accelerations, the motion of a particle will be uniformly circular if :

a

_{r}= 0 and a_{t}= 0a

_{r}= 0 and a_{t}≠ 0a

_{r}≠ 0 and a_{t}= 0a

_{r}≠ 0 and a_{t}≠ 0

2.

The radius of orbit of satellite of earth is R. Its kinetic energy is proportional to :

$\frac{1}{\mathrm{R}}$

$\frac{1}{\sqrt{\mathrm{R}}}$

R

$\frac{1}{{\mathrm{R}}^{3/2}}$

3.

A cone filled with water is revolved in a vertical circle of radius 4 m and the water does not fall down. What must be the maximum period of revolution?

2 sec

4 sec

1 sec

6 sec

4.

The length, breadth and thickness of a block are given by l = 12 cm, b = 6 cm and t = 2.45 cm. The volume of the block according to the idea of significant figures should be:

1 × 10

^{2}cm^{3}2 × 10

^{2}cm^{3}1.763 × 10

^{2}cm^{3}none of the above

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5.

Five particles of mass 2 kg are attached to the rim of a circular disc of radius 0.1 m and negligible mass. Moment of inertia of the system about the axis passing through the centre of the disc and perpendicular to its plane is

1 kg m

^{2}0.1 kg m

^{2}2 kg m

^{2}0.2 kg m

^{2}

6.

A sphere of diameter 0.2 m and mass 2 kg is rolling on an inclined plane with velocity v = 0.5 m/s. The kinetic energy of the sphere is :

0.1 J

0.3 J

0.5 J

0.42 J

7.

A police jeep is chasing with a velocity of 45 km/h, a thief in another jeep moving with velocity 153 km/h. Police fire a bullet with muzzle velocity of 180 m/s. The velocity with which it will strike the car of the thief is :

150 m/s

27 m/s

450 m/s

250 m/s

8.

The dimensional formula for Young's modulus is

[ML

^{-1}T^{-2}][M

^{0}LT^{-2}][MLT

^{-2}][ML

^{2}T^{-2}]

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9.

The radius of orbit of a planet is two times that of the earth. The time period of the planet is :

4.2 T

2.8 T

5.6 T

8.4 T

10.

A body falls from a height h = 200 m. The ratio of distance travelled in each 2 sec, during t = 0 to t = 6 second of the journey is

1 : 4 : 9

1 : 2 : 4

1 : 3 : 5

1 : 2 : 3

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