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CBSE

NEET Physics : Motion in A Plane

Short Answer Type

121.

A small spherical ball of mass m slides without friction from the top of a hemisphere of radius R. At what height will the ball lose contact with surface of the sphere ?

Multiple Choice Questions

122.

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

123.

A wooden block is floating on water kept in a beaker. 40% of the block is above the water surface. Now the beaker is kept inside a lift that starts going upward with acceleration equal to g/2. The block will then

sink
float with 10% above the water surface
float with 40% above the water surface
float with 70% above the water surface

124.

A cricket ball thrown across a field is at heights h₁ and h₂ from the point of projection at times t₁ and t₂ respectively after the throw. The ball is caught by a fielder at the same height as that of projection. The time of flight of the hall in this journey is

$\frac{h_{1} {t_{2}}^{2} - h_{2} {t_{1}}^{2}}{h_{1} t_{2} - h_{2} t_{1}}$
$\frac{h_{1} {t_{1}}^{2} + h_{2} {t_{2}}^{2}}{h_{2} t_{1} + h_{1} t_{2}}$
$\frac{h_{1} {t_{2}}^{2} + h_{2} {t_{1}}^{2}}{h_{1} t_{2} + h_{2} t_{1}}$
$\frac{h_{1} {t_{1}}^{2} - h_{2} {t_{2}}^{2}}{h_{1} t_{1} - h_{2} t_{2}}$

125.

A small object of uniform density rolls up a curved surface with an initial velocity v'. It reaches up to a maximum height of $\frac{3 v^{2}}{4 g}$ with respect to the initial position. The object is

ring
solid sphere
hollow sphere
disc

126.

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

$E / \sqrt{2}$
E/2
E/4
E/8

127.

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)

128.

The velocity of a projectile at the initial point A is (2i + 3j) m/s. Its velocity (in m/s) at point B is

− 2i − 3j
− 2i + 3j
2i − 3j
2i + 3j

129.

Given $\vec{A} = 2 \hat{i} + 3 \hat{j}$ and $\vec{B} = \hat{i} + \hat{j}$ . The component of vector $\vec{A}$ along vector $\vec{B}$ is

$\frac{1}{\sqrt{2}}$
$\frac{3}{\sqrt{2}}$
$\frac{5}{\sqrt{2}}$
$\frac{7}{\sqrt{2}}$

130.

Consider three vectors $A = \hat{i} + \hat{j} - 2 \hat{k}$ , $B = \hat{i} - \hat{j} + \hat{k}$ and $C = 2 \hat{i} - 3 \hat{j} + 4 \hat{k}$ . A vector X of the form $αA + βB$ (α and β are numbers) is perpendicular to C. The ratio of α and β is

1 : 1
2 : 1
− 1 : 1
3 : 1

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Subject

NEET Physics : Motion in A Plane

Short Answer Type

Multiple Choice Questions