Physics - Questions and Answers, General Study (GK)

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381.

Curie is a unit of

(a)energy of gamma rays

(b)half-life

(c)Radioactivity

(d)intensity of gamma rays

Comment

Answer is: CNA

382.

Fusion reaction takes place at high temperature because

(a)nuclei break up at high temperature

(b)Atoms are ionized at high temperature

(c)Molecules break up at high

(d)kinetic energy is high enough to overcome repulsion at high temperature

Comment

Answer is: DNA

383.

In nuclear reaction, there is conservation of

(a)energy only

(b)Momentum only

(c)Mass, energy and momentum

(d)Mass only

Comment

Answer is: CNA

384.

In a nuclear reactor, cadmium rods are used to

(a)absorb neutrons

(b)produce neutrons

(c)slow down neutrons

(d)speed up neutrons

Comment

Answer is: ANA

385.

Direct conversion of solar energy with the use of photovoltaic cell results in the production

(a)thermal energy

(b)mechanical energy

(c)optical energy

(d)electrical energy

Comment

Answer is: DNA

386.

Long distance short wave radio broad casting uses

(a)direct wave

(b)sky wave

(c)Ionoshperic wave

(d)electrical energy

Comment

Answer is: CNA

387.

Intelsat satellite is used for

(a)radar communication

(b)radio communication

(c)Intercontinental communication

(d)none of the above

Comment

Answer is: CNA

388.

The technique of collecting information about an object from a distance without making physical contact with it is

(a)space shuttle

(b)remote control

(c)remote accessing

(d)Remote sensing

Comment

Answer is: DNA

389.

Modem is a device used for

(a)converting analog signals to digital singals

(b)modulating signals

(c)either of the above

(d)none of the above

Comment

Answer is: ANA

390.

Cathode rays are similar to visible light rays, in that

(a)they both can ionise the gas through which they pass

(b)they both have a definite magnitude of wavelengths

(c)they both can affect photographic plates

(d)they both can be deflected by electric and magnetic fields

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 39

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