Physics - Questions and Answers, General Study (GK)

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361.

Which one of the following is not made of soft iron?

(a)core of dynamo

(b)core of transformer

(c)electromagnet

(d)Magnet of loudspeaker

Comment

Answer is: DNA

362.

All the magnetic materials lose their magnetic properties when

(a)dipped in oil

(b)dipped in water

(c)strongly heated

(d)brought near a peace of iron

Comment

Answer is: ANA

363.

The core of an electromagnet is made of soft iron because soft iron has

(a)large density and large retentivity

(b)small density and large retentivity

(c)large susceptibility and small retentivity

(d)Small susceptibility and small retentivity

Comment

Answer is: CNA

364.

Soft iron is used in many parts of electrical machines for

(a)high hysteresis loss and high permeability

(b)low hysteresis loss and high permeability

(c)Low hysteresis loss and low permeability

(d)high hysteresis loss and low permeability

Comment

Answer is: BNA

365.

No current flows between two charged bodies when connected?

(a)if they have the same quantity of charge

(b)if they have same capacity

(c)If they have same potential

(d)none of the above

Comment

Answer is: CNA

366.

A transformer is based on the principle of

(a)mutual inductance

(b)self inductance

(c)Ampere's law

(d)lenz's law

Comment

Answer is: ANA

367.

The working of dynamo is based on principle of

(a)electromagnetic induction

(b)conversion of energy into electricity

(c)Magnetic effect of current

(d)heating effect of current

Comment

Answer is: ANA

368.

A device which is used in our TV set, Computer, Radio set for storing the electric charge is

(a)resistor

(b)inductor

(c)capacitor

(d)Conductor

Comment

Answer is: ANA

369.

The light gathering power of a camera lens depends on

(a)its diameter only

(b)Ratio of focal length and diameter

(c)product of focal length and diameter

(d)wavelength of light used

Comment

Answer is: DNA

370.

Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

(a)to control the energy released in the reactor

(b)to absorb neutrons and stop the chain reaction

(c)To cool the reactor

(d)To slow down the neutrons to thermal energy

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 37

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