Question # 1

Energy stored in inductor is.

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1/2 L I²

1/2 LI

1/2 L2I

1/2 L2I2

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

If V_rms be the root mean square value of emf then its peak to peak value is given by

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Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

The types of quacks are.

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2

3

4

6

Magnetic flux density at a point due to current carrying coil is determined by

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Ampere's law

Faraday's law

Lenz's law

Gauss's law

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

A battery move a charge of 40 C around a circuit at constant rate in 20 Sec. The current will be.

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2 A

0.5 A

80 A

800 A

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

Calculate current in 2 2R /4Ω resistor.

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1 A

2R /4Ω

R/3Ω

2R /3Ω

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

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