Question # 1

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

At what temperature the adiabatic change is equivalent to the isothermal change?

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Zero degree Celsius

Zero Kelvin

Critical temperature

Above critical temperature

In the expression of force experienced by electron, the direction of both v and B are

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parallel

zero

perpendicular

none of them

A long wire wound tightly on a cylindrical core is called:

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Potentiometer

Solenoid

Toroid

Wheat and stone bridge

None of these

Rate of change of momentum is called

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Impulse

Force

Torque

Momentum

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

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

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1/R

1/R²

R

R²

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

Which one is the least multiple:

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Pico

Femto

Nano

Atto

A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

The materials which are used in selective absorption method to polarize the light are

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chronic substances

organic substances

inorganic substances

diachronic substance

SI unit of angular moment is

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Kgms^-1

Kgm²s^-2

Kgm²s^-1

Kgm³s^-1

When the terminal velocity is reached the acceleration of body moving through a viscous medium is

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Zero

Positive

Negative

Depends upon other factors

Essential characteristic of equilibrium is:

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

Huygen's principle is used to study the

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formation of wavefronts

propagation of wavefronts

nature of light

speed of light

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

Why is the weight of an object approximately the same at all points on the earth?

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the gravitational field is uniform

equal force is exerted on the object at points equidistant from the centre

weight is unaltered by attitude

weight of an object varies with its distance from earth

According to the first condition for equilibrium, the vector sum of all the forces acting on a body must be equal to

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The maximum value

The minimum value

A negative value

Zero

The changes which involve friction or dissipation of energy are reversible through

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Conduction

Convection

Radiation

All of these

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources

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Angular magnification

Resolution

Magnification

None of these

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