Question # 1

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

The unit of magnetic flux is

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Weber-m²

Weber-m³

Henry

Weber

The slopes of the tangent at any point on the curve gives the value of the

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average velocity at that point

instantaneous velocity at that point

average acceleration at that point

instantaneous acceleration at that point

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber

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Decreases, multi-mode graded

Increases, single mode step

Either of A or B

Increases, multi-mode step

In Newton s rings the central spot appears dark due to

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Phase change

Destructive interference

Small eye piece of optical device

Both a and b

If a raindrop with a mass of 0.05 g falls with constant velocity the retarding force of atmospheric firction is neglect density of air

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Zero

49 dynes

490 N

49 N

Which branch of physics deal with the structure and properties of solids

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Atomic Physics

Plasma Physics

Molecular Physics

Solid state Physics

Who proposed wave theory of light

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Huygens

Galileo

Einstein

Newton

The motion of molecules in gases i:

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Orderly

Random

Circular

All of these

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

If C and R denote capacity and resistance,the dimensional formula of CR is

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M°L°T^-1

M°L°T°

Not expressible in terms of MLT

If force of friction is negligible, then acceleration of two free falling objects of different masses is

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The same

Different

Smaller mass has smaller acceleration

None of these

The critical temperature of lead is

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1.18 K

4.2 K

3.72 K

7.2 K

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