Question # 1

A step up transformer is used 120 V line to provide 240 V. If primary coil has 100 turns the number of turns is secondary is.

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50

100

150

200

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

The number of crystal system are

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Three

Five

Seven

Fifteen

The force on a charge particle moving parallel to magnetic field is:

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Maximum

Minimum

Zero

None of these

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

the number of terminals in a semiconductor diode are

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2

3

4

5

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

For a current carrying solenoid the term 'n' has unit as.

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No unit

m^-1

m^-2

m-3

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

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