Question # 1

At the temperature, a body emits radiation which is principally

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of long wavelengths in the visible region

of long wavelengths in the invisible infrared region

of short wavelength in invisible ultraviolet region

none of these

When a mass 'm' is pulled slowly, the spring stretches by an amount x₀,then the average force would be

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F= Kx₀

F=1/2Kx₀

F=2Kx₀

F=4Kx₀

In the formula P = N₀KT, N₀denotes:

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Number of molecules per unit per volume

Number of moles

Number of molecules

None of these

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

The relation V = IR represents

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Ampere law

Faraday's law

Ohm's law

Len's law

Fluid friction is _____ the friction between two solid surfaces:

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Greater than

Smaller than

Equal to

None of these

If time period of a pendulum is doubled by increasing its length, then its frequency will

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Also be doubled

Become half

Become one fourth

Becomes four times

Addition of 2.189 kg, 11.8 kg and 5.32 kg gives the rounded off answer as:

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19.398

19.400

19.4

19.3

The resistance offered by a fluid to a solid moving inside it is called:

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Drag force

Surface force

Viscosity

None of these

Sadi carnot described an ideal heat engine in

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1820

1840

1860

1880

Unit vector is used to specify:

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Magnitude of a vector

Dimensions of a vector

Direction of a vector

Position of a vector

Albert A. Michelson devised interferometer is

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1820

1845

1860

1881

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

When two light waves travelling in the same direction are out of phase at any point, their resultant amplitude

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increases

decreases

remains unchanged

increases rapidly

The period of a satellite when there is critical velocity is

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80 min approx

84 min approx

82 min approx

90 mix approx

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

Maximum number of orders available with a grating is ______ grating element

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Independent of

Directly proportional to

Inversely proportional to

Equal to

In single slit diffraction the condition for second minimum is

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Sinθ = λ

d Sinθ =2λ

d Sinθ =3λ

d Cosθ =0

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by putting

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V_f= 0

Simple 'a'

a by g

None of these

A particle is moving in a vertical circle.The tensions the string when passing through two positions at angles 30° and 60° from vertical (lowest positions) are T₁ and T₂ respectively.Then

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T₁ = T₂

T₂ > T₁

T₁ > T₂

Tension in the string always remains the same

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decreases at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

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