Question # 1

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

substance which undergo plastic deformation until they break are known as.

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Brittle substances

Ductile substance

Non magnetic substance

Magnetic substance

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

The charge number of Ba is.

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197

141

56

85

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

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