Question # 1

When a position comes close to an electron they annihilate into

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one photon

two photons which travel in the same direction

two photons which travels in the opposite direction

two photons which travel in any direction

Change in momentum is one second called.

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Impulse

Force

Energy

Work

The change of order of vectors in a dot product of two vectors:

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Changes its value

Doesn't change it's value

Changes the direction product quantity

None of these

Referring to above figure, current in coil P falls from its maximum value to zero

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

A car is turning around a corner at 10 m/sec as it travels along an arc of a circle. If value of centripetal acceleration is 10 m/sec²in this case, find radius of the circular path:

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1 m

5 m

10 m

15 m

The moment of inertia plays the same role in angular motion as in linear motion as

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Density

Weight

Mass

None of these

The work done in an equipotential surface is

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Maximum

Infinite

Zero

None of these

A material with high retentively and large corcivety most useful to make

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Electromagnet

Permanent magnet

Choke

None of these

In YDS experiment using white light

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Colored fringes will be obtained

No fringes will be observed

Alternative bright and dark fringes will be seen

None of these

A physical quantity which has both magnitude and direction but does not satisfies parallelogram law of addition

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Must be a vector

May be both scalar and vector

Scalar

None

When crest of one wave falls on the crest of the other wave. This phenomenon is known as:

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Destructive interference

Diffraction

Polarization

Constructive interference

The original source of fossil fuels is

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Geothermal

Biomass

Sun

None of these

The dimensional formula of gravitational constant G is:

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MLT^-2

ML³T^-2

M^-1L³T^-2

M^-1LT^-2

Vector A lies in the XY-plane. For what orientation will its components have opposite signs ?

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II-quadrant

III-quadrant

IV-quadrant

a and c

Reverse process of vector addition is called

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Negative of a vector

Subtraction of vector

Resolution of a vector

Multiplication of a vector

Angle subtended by any side of the eight-sided mirror at the center is

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π/8

π/4

2π/8

2π/4

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