Question # 1

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

Various types of cancer are treated by

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Carbon -14

Nickel -63

Cobalt -60

Strontium -90

A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be:

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1884 ke V

1/1840 keV

1 keV

920 keV

If the coil is wound on iron core, the flux through it.

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Decreases

Becomes zero

Increases

Remains constant

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

The potential difference between the top and bottom of a cloud chamber is of the order of

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290 v

400 v

1 kv

None of above

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

The mass spectrum of naturally occurring neon, showing

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1 isotope

2 isotope

3 isotope

4 isotope

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

Efficiency of transformer does not affected by

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Input voltage

Core of transformer

Insulation between sheet

Resistance of coils

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