Question # 1

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

The phase angle of a series RLC circult at resonant frequency is

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1/2

sigma

Zero

sigma /4

Black Body radiation spectrum is an example of:

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Atomic spectra

Line spectra

Continuous spectra

None of above

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

Power dissipated in a pure inductor is.

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Large

Small

Infinite

Zero

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

Controlling rods inserted into the reactor are of metal:

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Aluminium

Cadmium

Magnesium

Copper

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Half life of radon gas is

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3.8 minutes

3.8 days

3.8 months

3.8 years

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Farad is defined as

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"Coulomb/Volt

Ampere /Volt

Coulomb /Joule

Volt/Coulomb

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