Question # 1

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

A tube tapers from 20 cm diameter to 2 cm, the velocity at first cross-section is 50 ms^-1then velocity at second cross-section is

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5000 cms^-1

500 cms^-1

50 cms^-1

0.5 cm/s

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

The practical application of the phenomenon of Mutual induction is

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Transformers

Generator

Motor

All of these

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

According to the second law, which is must to produce work

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a source contains a large amount of heat energy

two sources at the same temperature

two sources at the different temperatures

a source contains a small amount of energy

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

The dot product of electric field intensity E and vector area A is called

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Electric potential

Electric flux

Electric field

Magnetic field

A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is

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24/13

10/3

3

4,8

The torque per unit twist of coil is called

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proportionality constant

gravitational constant

boltzman constant

coupling constant

If C_vdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then C_v𝜟T gives:

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Volume

Pressure

Energy

Entropy

The minimum number of unequal forces whose vector sum can be zero is

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3

2

1

4

Radian is an angle which is

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Solid angle

Plane angle

Angle

None of these

Point out angle/angle at which the sin θ and tan θ have the same value

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2^o and 8^o

4^o and 6^o

2^o and 4^o

8^o and 10^o

If a unit charge experiences a force of 100N at a point electric field then intensity will be

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100 N/C

16 x 10^-19 N/C

10 N/C

10 x 10^-19 N/C

Torque is the resultant of

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Dot product of force and moment arm

Simple product of force and moment arm

Cross product between position vector and force

Addition of force and moment arm

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 10⁹Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 10⁵kg.

(g = 10 N kg^-1)

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10^-2m²

10^-1m²

10^-4m²

10^-3m²

Is there any physical distinction between the valence and conduction band

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Yes

No

Very small

None of these

When an image is placed at the focal length of the eye piece, the final image formed at

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2 F

4 F

6 F

Infinity

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

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Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

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