Question # 1

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

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

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

Electric power:

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Vx1

V²x1

V/1

V/1²

The 1^st Bohr atom in the hydrogen atom has radius

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3.56 x 10^-10 m

0.053 x 10^-11 m

0.53 x 10^-11 m

5.30 x 10^-11 m

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

The e/m of a neutron is

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Less than electron

The same as electron

Zero

Greater than election

The total flux through a closed surface.

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Directly proportional to shape and geometry

Independent of medium

Depend on shape and geometry

Dependent on medium and the charge enclosed

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