Question # 1

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

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

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