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

Two forces of 10 N and 8 N are applied simultaneously to a body. the maximum value of their resultant is:

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2 N

- 2 N

18 N

36 N

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

CRO deflects the beam of

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proton

a-particle

electron

neutron

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

The direction of induced current is always so as to oppose the cause which produces it. This is

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Lenz's law

Ampere's law

Faraday's law

Coulomb's law

None of these

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

If the slits in YDS experiment are made closer, fringe spacing will:

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Increase

Decrease

Remain same

None of above

The expression for the range of the projectile is

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The magnitude of torque is equal to the product of the force and the moment arm. The moment arm is

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The distance between the point and the point of the action of the force

The maximum distance between the pint and the line of action of the force

The minimum distance between the pivot point and the line of action of the force

All of these

It is easier to turn a steering wheel with both hands than with a single hand because

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Accelerating force increase on the wheel

Two forces act on the wheel

Two hands provide firm grip

Couple acts on the wheel

Debye is the unit of

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Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

Every streamline can

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Not cross each other

Cross each other

Some what cross each other

None of these

In a spectrometer experiment monochromatic light is incident normally on a diffraction grating having 4.5 x 105 lines per meter.The second order line is seen at an angle of 30 to the normal what is the wavelength of the light?

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200 nm

430 nm

500 nm

556 nm

Diffraction effect is

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More for a round edge

More for a sharp edge

Less for a sharp edge

None of these

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a.

The separation of the fringes is X.

a is now halved and D is increased by a factor of 4.

What is the new fringe separation?

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16 X

8 X

4 X

2 X

A spectrometer is used to find

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Wavelength of light

Refractive index of the prism

Angle of minimum deviation of prism

All of these

Electric potential of earth is taken to be because earth is a good

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insulator

Conductor

Semi-conductor

Dielectric

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