Question # 1

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

A current carrying conductor experience maximum magnetic force in a uniform magnetic field when it is placed.

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Perpendicular to field

Parallel to field

At an angle of 60 ^o to the field

None of these

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

In 'N' type material, the minority charge carriers are.

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Free electrons

Holes

Protons

Mesons

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

Electromagnetic induction obeys law of conservation

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Charge

Energy

Momentum

Mass

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

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

When the back emf is zero, its draws.

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Zero current

Minimum current

Maximum current

Steady current

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

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

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

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

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