Physics - Questions and Answers, General Study (GK)

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521.

Consider the following statements
Household electrical appliances are not usually connected in series, because
1. Switching of an appliances would switch off the rest.
2. A fuse would blow as soon as one appliances is used.
3. Power consumption would be very much greater.
4. The appliances would get damaged due to high current.
Which of the above statements are correct?

(a)Only 1

(b)2 and 3

(d)1, 2 and 4

Comment

Answer is: A

522.

A charge particle moves with velocity V in a uniform magnetic field B. The magnetic force experienced by the particle is

(a)Always zero

(b)Zero, if B and V are perpendicular

(c)Zero, if B and V are parallel

(d)Zero, if B and V are inclined at 45 degree

Comment

Answer is: C

523.

AC power is transmitted from a power house at a high voltage

(a)Power cannot be transmitted at low voltages

(b)The rate of transmission is faster at high voltages

(c)It is more economical due to less power loss

(d)A precaution against theft of transmission line

Comment

Answer is: C

524.

The inherent property of all matter is/are

(a)Diamagnetism

(b)Paramagnetism

(c)Ferromagnetism

(d)All of these

Comment

Answer is: A

525.

Fleming right hand rule gives

(a)The magnitude of the magnetic field

(b)The magnitude of the induced EMF

(c)The direction of the induced EMF

(d)None of the above

Comment

Answer is: C

526.

The core of transformer is laminated to reduce

(a)Magnetic loss

(b)Eddy current loss

(c)Hysteresis loss

(d)Copper loss

Comment

Answer is: B

527.

Alternating current Instead of direct current is used in a long distance electric transmission because

(a)It is easy to generate

(b)Rectification is possible

(c)Energy losses are minimum

(d)It causes fewer accidents

Comment

Answer is: A

528.

When an AC source is connected across a resistor

(a)The current lags behind the voltage in phase

(b)The current and the voltage are in same phase

(c)The current leads the voltage in phase

(d)None of the above

Comment

Answer is: B

529.

By inserting a soft iron piece to solenoid, the strength of the magnetic field

(a)Decrease

(b)Increase

(c)First increase then decrease

(d)Remains unchanged

Comment

Answer is: B

530.

The temperature at which a ferromagnetic material becomes paramagnetic is called

(a)Curie temperature

(b)Neutral temperature

(c)Inversion temperature

(d)Critical temperature

Comment

Answer is: A

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Physics - Questions and AnswersPage 53

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