KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 120 - 122 of 250

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Question number: 120

» Laws of Motion » Law of Conservation of Linear Momentum

Appeared in Year: 2013

MCQ▾

Question

A bullet of mass m is fired horizontally into a large sphere of mass M and radius R resting on a smooth horizontal table.

A bullet of mass m is fired horizontally into a large sphere.

A Bullet of Mass M Is Fired Horizontally Into a Large Sphere.

In figure a bullet of mass m is fired horizontally in to a large sphere of mass M and radius r resting on a smooth horizontal table.

The bullet hits the sphere at a height h from the table and sticks to its surface. If the sphere starts rolling without slipping immediately on impact, then

Choices

Choice (4) Response

a.

hR=4m+3M2(m+M)

b.

hR=10m+7M5(m+M)

c.

hR=4m+3Mm+M

d.

hR=m+3Mm+2M

Question number: 121

» Rotational Motion » Moment of Inertia

Appeared in Year: 2015

MCQ▾

Question

The moments of inertia of a non – uniform circular disc (of mass M and radius R) about four mutually perpendicular tangents AB, BC, CD, DA are I1, I2, I3 and I4, respectively (the square ABCD circumscribes the circle). The distance of the centre of mass of the disc from its geometrical centre is given by,

Choices

Choice (4) Response

a.

13MR(I1I2)2+(I3I4)2

b.

12MR(I1+I3)2+(I2+I4)2

c.

112MR(I1I3)2+(I2I4)2

d.

14MR(I1I3)2+(I2I4)2

Question number: 122

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2015

MCQ▾

Question

Two blocks of masses 5m and 4m in contact on a smooth table. A force P is first applied horizontally on block of mass 5 m and then on 4m. The contact forces between the two blocks in the two cases in the ratio

Two blocks of different masses connected

Two Blocks of Different Masses Connected

In figure two blocks of different masses 5 m and 4 m in contact on a smooth table. Force P is applied on both the block one by one.

Choices

Choice (4) Response

a.

3: 2

b.

5: 3

c.

2: 3

d.

1: 2

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