Question # 1

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

The typical nuclei are less than:

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10^-16m

10^-14m

10^-12m

10^-10m

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

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

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

The A.M. transmission frequencies range from

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540 KHz to 1000 KHz

540 Khz to 1600 KHz

520 KHz TO 1600 KHz

520 KHz TO 1400 KHz

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

In A.C circuit through a capacitor which one is:

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Current leads voltage by 90^∘

Current lags behind voltage by 90^∘

Both will be in phase

None of above

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

A positive charge is moving towards an observer, The direction of magnetic induction will be.

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Toward right

Anti clockwise

Clockwise

Toward left

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

If we make magnetic field stronger the value of induced current is.

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Decreased

Increased

Vanishes

Remain constant

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

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