Physics

NEET Class 12

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1.

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and g = 10 ms^{-2}. This maximum acceleration of the car, for the box to remain stationary, is

8 ms

^{-2}6 ms

^{-2}4 ms

^{-2}2 ms

^{-2}

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The dimension of angular momentum is

[M

^{0}L^{1}T^{-1}][M

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

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

^{2}L^{1}T^{-2}]

C.

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

Dimension-of angular momentum

L = r × p

= [L] [MLT^{-1}]

= [ML^{2}T^{-1}]

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3.

f A = B + C have scalar magnitudes of 5, 4, 3 units respectively, then the angle between A and C is

cos

^{-1}(3/5)cos

^{-1}(4/5)π/2

sin

^{-1}(3/4)

4.

A particle is travelling along a straight line OX. The distance x (in metre) of the particle from O at a time t is given by x = 37 + 27t − t^{3}, where t is time in seconds. The distance of the particle from O when it comes to rest is

81 m

91 m

101 m

111 m

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5.

A particle is projected from the ground with a kinetic energy E at an angle of 60° with the horizontal. Its kinetic energy at the highest point of its motion will be

$\mathrm{E}/\sqrt{2}$

E/2

E/4

E/8

6.

A bullet on penetrating 30 cm into its target loses its velocity by 50%. What additional distance will it penetrate into the target before it comes to rest ?

30 cm

20 cm

10 cm

5 cm

7.

Average distance of the Earth from the Sun is L_{1}. If one year of the Earth = D days, one year of another planet whose average distance from the Sun is L_{2} will be

$\mathrm{D}{\left(\frac{{\mathrm{L}}_{2}}{{\mathrm{L}}_{1}}\right)}^{2}\mathrm{days}$

$\mathrm{D}{\left(\frac{{\mathrm{L}}_{2}}{{\mathrm{L}}_{1}}\right)}^{3/2}\mathrm{days}$

$\mathrm{D}{\left(\frac{{\mathrm{L}}_{2}}{{\mathrm{L}}_{1}}\right)}^{2/3}\mathrm{days}$

$\mathrm{D}\left(\frac{{\mathrm{L}}_{2}}{{\mathrm{L}}_{1}}\right)\mathrm{days}$

8.

A spherical ball A of mass 4 kg, moving along a straight line strikes another spherical ball B of mass 1 kg at rest. After the collision, A and B move with velocities v_{1} ms^{-1} and v_{2} ms^{-1} respectively making angles of 30° and 60° with respect to the original direction of motion of A. The ratio $\frac{{\mathrm{v}}_{1}}{{\mathrm{v}}_{2}}$ will be

$\frac{\sqrt{3}}{4}$

$\frac{4}{\sqrt{3}}$

$\frac{1}{\sqrt{3}}$

$\sqrt{3}$

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9.

In a slide caliper, (m + 1) number of vernier divisions is equal to m number of smallest main scale divisions. If d unit is the magnitude of the smallest main scale division, then the magnitude of the vernier constant is

d / (m + 1) unit

d / m unit

md / (m + 1) unit

(m + 1)d / m unit

10.

From the top of a tower, 80 m high from the ground, a stone is thrown in the horizontal direction with a velocity of 8 ms^{-1} . The stone reaches the ground after a time 't' and falls at a distance of 'd' from the foot of the tower. Assuming g = 10 m/s^{2}, the time t and distance d are given respectively by

6 s, 64 m

6 s, 48 m

4 s, 32 m

4 s, 16 m

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