KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 42 - 44 of 250

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Question number: 42

» Current Electricity » Electrical Energy and Power

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

Circuit diagram of 5 resistors

Circuit Diagram of 5 Resistors

In above figure circuit of combination of five resistors are shown.

Choices

Choice (4) Response

a.

R1

b.

R2

c.

R4

d.

R3

Question number: 43

» Dual Nature of Matter and Radiation » Black-Body Radiation

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.

4P

b.

P2

c.

2P

d.

P4

Question number: 44

» Dual Nature of Matter and Radiation » Black-Body Radiation

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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