Question # 1

When low energy photon interact with a metal,which of the following effect is likely to be taken place

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pair production

photoelectric

Compton effect

None of these

0.0001210 has ____________ significant figures.

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Four

Three

Seven

Eight

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

Dimension of mass is written as:

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M

[M]

(M)

[m]

A flowing liquid possess

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K.E

P.E

Pressure Energy

All

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

Electron volt is the unit of

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Potential difference

Energy

Resistance

Capacitance

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

If a machine does work at the rate of 1.0 joules in energy two 5 seconds, then its power is said to be

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0.25 watt

0.20 watt

1 watt

None of these

The blood pressure of the person

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Decreases with age

Increases with age

Remains the same

None

If coplanar forces acting on a body form a closed polygon, then the body is said to be in equilibrium

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yes

False

Sometimes in equilibrium

None of these

Age of the Universe is

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5 × 10¹⁵ sec

5 × 10¹⁷ sec

5 × 10¹⁹ sec

None of these

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

We can achieve polarization by

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Absorption

Reflection

Scttering

All of above

A piece of Aluminium (Al) and a piece of Germanium (Ge) are cooled T1 K to T2 K. The resistance of:

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Each of them increases

Each of them decreases

Al increases and Ge decreases

Al decreases and that of Ge increases

Which optical fibre is used for shorter distances only?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

all of them

A chiminey works best when it is

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Tall

Exposed to air currents

Not tall but wide

a and b

Which of the following parameter does not characterize the thermodynamic state of matter?

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Work

Pressure

Temperature

Internal energy

Polymers have chemically combinations with

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Carbon

Nitrogen

Hydrogen

All of them

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