Question # 1

In an adiabatic process the work is done at the expense of the

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energy supplied to the system

energy gained from the surroundings

internal energy

none of them

To sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

Laws of reflection and refraction can also be explained by:

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

When the bob of simple pendulum is at extreme position, its K.E. will be

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maximum

minimum

zero

all of them

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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Remains constant

Decreases

Increases to infinity

Reduced to zero

The charge per unit time through any cross-section of a conductor is called

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capacitance

electric power

current

potential difference

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

The range of the projectile means a body covers horizontal distance which is

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maximum

Minimum

Distance

None of these

The refracting edge of the prism must be parallel to the axis of rotation of the telescope, so that the turn table is leveled using

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Screws of the spectrometer

Leveling screws

Turn table screw

None of these

The value of g at the center of earth is:

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Double

Zero

10 time larger than earth

Infinite

When the car moves with increasing acceleration, the velocity time graph is a

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Straight line

Horizontal straight line

Curve

None of these

When an electron is accelerated through a P.D of one volt it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

Crystalline solids are also

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Metals

Ionic compound

Ceramics

All of them

If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards

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West

East

North

The magnetic field due to the electric current in a conducting wire is:

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Towards the centre of the conducting wire

Circular around the conducting wire

In the direction of the electric current

In the direction opposite to the electric current

When the opposite faces of a rigid cube are subjected to shear stress, the shear strain produced is given by

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γ = Δa/a

tan θ

γ = θ

All of them

The first superconductor was discovered in

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1905

1911

19161

1920

The work done in taking a charge q once round a circle of radius r and having a charge Q at the centre is

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qQ/4πε_°r²

qQ/(4πε_°r)

qQ/[4πε_°](2πr)

Equal

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