Question # 1

The instrument which is used to display the magnitude of changing electric current is called:

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Evacuated tube

Cathode rays oscilloscope

Television tube

Picture tube

A converging lens becomes a magnifying glass when an object is placed:

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Outside of focal length

Inside the focal length

Equal of focal length

At double of focal length

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

The turn ratios of a transformer is 10. It means.

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I_s = 10I_p

N_s = N_p

N_s = 10 N_p

V_s =V_p /10

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

Which statement is true about the magnetic poles?

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

The refracted light striking to the side of prism is called:

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Refracted ray

Incident ray

Reflected ray

Emergent ray

One micro coulomb charge is equal to:

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10^-3c

10³c

10⁶c

10^-6c

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