Question # 1

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

An inductor of 1 henry inductance has a reactance 500 ohms, then the frequency required is approximately

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50 Hz

100 Hz

80 Hz

120 Hz

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

Which of the following is one of the spectral series of atomic hydrogen?

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Brockett series

Balmer series

P fund series

All of above

Lenz's law was given by Heinrich lenz in:

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1894

1904

1854

1834

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

The first superconductor was discovered in:

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1831

1911

1921

1876

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

In AC system we generate sine wave form because:

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It san be easily draw

It produces least disturbance in electrical circuits

It is nature standard

Other waves cannot be produced easily

The potential difference across the depletion region of germanium is.

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0.3 V

0.5 V

0.7 V

0.8 V

How many times, the alpha particle is more massive than electrons.

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6332

7332

8332

9332

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

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