Question # 1

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

An atom can reside in excited state for

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10^-8 second

One second

10^-10 second

More than one second

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Drift velocity of electrons is.

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10^-1 m/s

10^-2 m/s

10^-3 m/s

10³ m/s

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

Torque is produced in a current carrying coil when it is placed in a

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Magnetic field

Electric field

Gravitational field

Nuclear field

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

Lenz's law presented in

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1834

1934

1826

1836

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

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