KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 39 - 41 of 250

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Question number: 39

» Center of Mass » Centre of Mass of a Two-Particle System

Appeared in Year: 2011

MCQ▾

Question

A narrow but tall cabin is falling freely near the earth’s surface. Inside the cabin, two small stones A and B are released from rest (relative to the cabin). Initially A is much above the centre of mass and B much below the centre of mass of the cabin. A close observation of the motion of A and B will reveal that –

Choices

Choice (4) Response

a.

A and B continue to be exactly at rest relative to the cabin

b.

A and B move slightly towards each other vertically

c.

A and B fall to the bottom of the cabin with constant acceleration due to gravity

d.

A moves slowly upward and B moves slowly downward relative to the cabin

Question number: 40

» Wave Optics » Young's Double Slit Experiment

Appeared in Year: 2011

MCQ▾

Question

In a Young’s double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0 micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes?

Choices

Choice (4) Response

a.

2.0 mm

b.

0.25 mm

c.

1.0 mm

d.

0.5 mm

Question number: 41

» Rotational Motion » Conservation of Angular Momentum

Appeared in Year: 2012

MCQ▾

Question

A planet orbits in an elliptical path of eccentricity e around a massive star considered fixed at one of the foci. The point in space where it is closest to the star is denoted by P and the point where it is farthest is denoted by A. Let VP and VA are be the respective speeds at P and A. Then –

A planet orbit in an elliptical path

A Planet Orbit in an Elliptical Path

In figure a planet orbits in an elliptical path of eccentricity e around a massive star consideration fixed at one of the foci.

Choices

Choice (4) Response

a.

VPVA=1+e1e

b.

VPVA=1+e21e

c.

VPVA=1

d.

VPVA=1+e21e2

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