Question # 1

Resistance of choke is

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zero

Large

Very small

Infinite

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

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

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

1 amu is equal to

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1.0606 x 10^-27 kg

1.66 x 10^-31 kg

1.66 x 10^-34 kg

1.66 x 10^-19 kg

When gama rays are emitted, the nuclear mass.

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Decreases by 4 units

Does not change

Increases by 2 units

Increase by 1 unit

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

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

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

With the speed of motor, magnitude of back emf

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Remain same

Increase

Decrease

First increases then decreases

What is difference is isotopes

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Number of protons

Number of neutrons

Number of electrons

Charge number

By winding the coil around a less magnetic core, self induction.

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Will increase

Will decrease

Remain same

First increase then decrease

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