Physics

NEET Class 12

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1.

Acceleration due to gravity is g on the surface of the earth. Then the value of the acceleration due to gravity at a height of 32 km above earth's surface is (Assume radius of earth to be 6400 km)

0.99 g

0.8 g

1.01 g

0.9 g

3.

If the figure below represents a parabola, identify the physical quantities representing Y and X for constant acceleration

X = time, Y = velocity

X = velocity, Y = time

X = time, Y= displacement

X = time, Y = acceleration

4.

A ball which is at rest is dropped from a height h metre. As it bounces off the floor its speed is 80% of what it was just before touching the ground. The ball will then rise to nearly a height

0.94 h

0.80 h

0.75 h

0.64 h

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5.

Two bodies of different masses are dropped from heights of 16 m and 25 m respectively. The ratio ofthe time taken by them to reach the ground is

$\frac{25}{16}$

$\frac{5}{4}$

$\frac{4}{5}$

$\frac{16}{25}$

6.

The recoil velocity of a 4.0 kg rifle that shoots a 0.050 kg bullet at a speed of 280 ms^{-1} is

+ 3.5 ms

^{-1}− 3.5 ms

^{-1}$-\sqrt{\left(3.5\right)}{\mathrm{ms}}^{-1}$

$+\sqrt{\left(3.5\right)}{\mathrm{ms}}^{-1}$

7.

A man of height h walks in a straight path towards a lamp post of height H with uniform velocity u. Then the velocity of the edge of the shadow on the ground will be

$\frac{\mathrm{hu}}{\left(\mathrm{H}-\mathrm{h}\right)}$

$\frac{\mathrm{Hu}}{\left(\mathrm{H}+\mathrm{h}\right)}$

$\frac{\left(\mathrm{H}-\mathrm{h}\right)}{\mathrm{Hu}}$

$\frac{\left(\mathrm{H}+\mathrm{h}\right)}{\mathrm{Hu}}$

8.

A train of 150 m length is going towards north direction at a speed of 10 ms^{-1} . A parrot flies at a ,speed of 5ms^{-1} towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

12 s

8 s

15 s

10 s

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9.

In the motion of a rocket, physical quantity which is conserved is

angular momentum

linear momentum

force

work

10.

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

1200 m

0.33 km

333.3 km

3.33 km

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