# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 41 - 44 of 268

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## Question number: 41

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 –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 42

Appeared in Year: 2011

MCQ▾

### Question

In the circuit shown below the resistances are given in ohms and the battery is assumed ideal with emf equal to 3.0 volts. The resistor that dissipates the most power is

### Choices

Choice (4) Response

a.

R1

b.

R2

c.

R4

d.

R3

## Question number: 43

Appeared in Year: 2011

MCQ▾

### Question

The total radiative power emitted by spherical blackbody with radius R and temperature T is P. If the radius is doubled and the temperature is halved then the radiative power will be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 44

Appeared in Year: 2012

MCQ▾

### Question

The total energy of a black body radiation source is collected for five minutes and used to heat water. The temperature of the water increases from 10.00C to 11.00C. The absolute temperature of the black body is doubled and its surface area halved and the experiment repeated for the same time. Which of the following statements would be most nearly correct?

### Choices

Choice (4) Response

a.

The temperature of the water would increase from 10.00C to a final temperature of 140C

b.

The temperature of the water would increase from 10.00C to a final temperature of 180C

c.

The temperature of the water would increase from 10.00C to a final temperature of 120C

d.

The temperature of the water would increase from 10.00C to a final temperature of 110C

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