Question # 1

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

The building blocks of protons and neutrons are called.

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Ions

Electrons

Positrons

quarks

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

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

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

CRO works by deflecting the beam of electron as they pass through

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Uniform magnetic field

Uniform electric field between two sets of parallel plates

Non-uniform magnetic field

None of these

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

The magnitude of motional emf is given by

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EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

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