Question # 1

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

Which is not true for X rays

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X rays are not defected by electric field

X rays are polarized

X rays consist of electromagnetic waves

X rays can be diffracted by grating

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

DC generator by william Sturgeon in:

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1894

1961

1834

1961

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

Electric potential at a distance ''r'' from ''q'' is:

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V_r = 1/54πε_∘q/r₂

Vr=1/4πε_∘²q/r

V_r=1/4πε_∘2q/r

V_r=1/4πε_∘q²/r

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

For normal transistor the emitter current can be given by

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I_E = I_C

I_E = I_C + I_B

I_E = I_B

None of these

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

Terminal potential difference is greater than emf of the cell when

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Circuit is open

Circuit is closed

small battery is charged by bigger battery

None of these

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

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