Question # 1

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

How many times, the alpha particle is more massive than electrons.

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6332

7332

8332

9332

Weber is the unit of

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Magnetic flux

Permeability

magnetic force

None of above

In three phase A.C supply coils are inclined at an angle of.

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0^o

90^o

120^o

80^o

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

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

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10%

15%

85%

90%

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

The absolute electric potential at a point distance 20 cm from a charge of 2 uC is.

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9 x 10² V

9 x 10³ V

9 x 10⁴ V

9 x 10 ⁵ V

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

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

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

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