Question # 1

The value of the Stephen's constant for black body radiations is given by

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5.6 x 10⁸Wm^-2K^-4

5.67 x 10^-8Wm^-2K^-4

2.9 x 10^-3mK

2.9 x 10³mK

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

A dirty carpet is to be cleaned by heating. This is in according with______law of motion.

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First

Second

Third

None of these

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

The time taken to complete one vibration is called:

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Frequency

Amplitude

Time

Time period

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

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20

200

2000

20,000

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

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Magnetic field

Electrostatic field

Electromagnetic field

All of these

None of these

Bulk modulus for ice is

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5

6

7

8

The source in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

A mode of propagation of light through optical fibre in which the light within the fibre is

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Reflected

Refracted

Continuously refracted

None of these

Two bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum.The ratio of their masses is

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1 : 2

1 : 1

4 : 1

1 : 4

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

For a body moving with constant speed in a horizontal circle,which of the following remains constant?

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Velocity

Centripetal force

Acceleration

Kinetic energy

The deformation produced in the body by an applied force in their

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Shape

Length

Volume

All of them

Light waves are

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Transverse waves

Longitudinal waves

Compressional wave

None of these

Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is

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Increase to maximum

Reduce to minimum

Reduce to zero

None of these

'S' is the arc length and after one revolution it becomes

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2π

2π/r

2πr

None of these

The irregular flown of fluid is called

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Normal flow

Streamline flow

Turbulent flow

None of these

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