Physics - Questions and Answers, General Study (GK)

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391.

Compton effect is associated with

(a)positive rays

(b)β-rays

(c)X-rays

(d)γ-rays

Comment

Answer is: CNA

392.

Photoelectric effect can be explained by assuming that light

(a)can be polarised

(b)consist of quanta

(c)is a form of transverse wave

(d)is a form of longitudinal wave

Comment

Answer is: BNA

393.

The electrons are emitted in the photoelectric effect from a metal surface

(a)only if temperature of the surface is high

(b)only if the frequency of the incident radiation is above a certain threshold value

(c)at the rate of independent of the nature of the metal

(d)none of the above

Comment

Answer is: BNA

394.

Which one of the following pairs of rays is electromagnetic in nature

(a)β-rays and γ-rays

(b)Cathode rays and X-rays

(c)α-rays and β-rays

(d)X-rays and γ-rays

Comment

Answer is: DNA

395.

When X-rays are produced, then

(a)heat is produced on the target

(b)heat is absorbed by the target

(c)a lumineous light is to be seen on the target

(d)both (a) and (c)

Comment

Answer is: DNA

396.

Which of the following is used in oven?

(a)X-rays

(b)UV-rays

(c)Microwaves

(d)Radio waves

Comment

Answer is: CNA

397.

Consider the following statements
X-rays
1. can pass through thin sheets of aluminium
2. can be deflected by magnetic field.
3. move with a velocity less than the velocity of ultraviolet rays in vacuum.

(a)1, 2 and 3

(b)only 1

(d)1 and 2

Comment

Answer is: BNA

398.

A radar beam consists of

(a)X-rays

(b)UV-rays

(c)infrared rays

(d)Microwaves

Comment

Answer is: DNA

399.

During a nuclear fusion reaction

(a)a heavy nucleus breaks into two fragments by itself

(b)a light nucleus bombarded by thermal neutrals breaks up

(c)a heavy nucleus bombarded by thermal neutrons breaks up

(d)Two light nuclei combine to give a heavier nucleus and possibility other products

Comment

Answer is: DNA

400.

If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?

(a)Beta rays

(b)Alpha rays

(c)Gamma rays

(d)All have same wavelengths

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 40

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