Physics - Questions and Answers, General Study (GK)

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331.

Permanent magnet can be made from

(a)cobalt

(b)aluminium

(c)zinc

(d)lead

Comment

Answer is: ANA

332.

Instrument used to store the electric charge is known as

(a)inductor

(b)capacitor

(c)transformer

(d)transistor

Comment

Answer is: BNA

333.

Which of the following pairs of material serves as electrodes in chargeable batteries commonly used in device such as torch light, electric shaver etc?

(a)Iron and cadmium

(b)Nickel and cadmium

(c)Lead peroxide and lead

(d)Zinc and carbon

Comment

Answer is: CNA

334.

What is the difference between a CLF and an LED lamp?
1. To produce light, a CLF uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
2. The average life span of a CFL is much longer than of and LED lamp.
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements give above is/are correct?

(a)only 1

(b)2 and 3

(d)1, 2 and 3

Comment

Answer is: CNA

335.

A substance which radiates light when heated to a light temperature is said to be

(a)luminescent

(b)incandescent

(c)fluorescent

(d)phosphorescent

Comment

Answer is: DNA

336.

Ohm's law does not apply to which of the following?

(a)AC circuits

(b)Conductors

(c)Semiconductors

(d)none of these

Comment

Answer is: CNA

337.

What is the maximum number of different electrical combination possible with three equal resistances?

(a)2

(b)3

(d)5

Comment

Answer is: CNA

338.

The circuit element where the impressed voltage is always in phase with the resulting current is an ideal

(a)resistor

(b)capacitor

(c)coil

(d)transformer

Comment

Answer is: ANA

339.

A permanent magnet repels

(a)ferromagnetic substances only

(b)diamagnetic substances only

(c)paramagnetic substances only

(d)both (b) and (c)

Comment

Answer is: CNA

340.

In a dry cell which of the following are used as electrolytes?

(a)Ammonium chloride and zinc chloride

(b)Sodium chloride and calcium chloride

(c)Magnesium chloride and zinc chloride

(d)Ammonium chloride and calcium chloride

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 34

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