Question # 1

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

While finding the electric intensity at a point between two oppositely charged parallel plates, the Gaussian surface is taken in the form of a hollow:

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Cylinder

Box

Sphere

Circle

Rectangle

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic field

Constant electric field

None of these

The distance covered by the wave during one period is called its:

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Wave number

Frequency

Wavelength

Time period

To and from motion of a body about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

Spherical aberration can be reduced by using

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Convex lens

All the portions of the lens

Central portion of the lens

Upper portion of the lens

The ratio of the diameter of two convex lenses is the ratio of their focal lengths

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Greater than

Less than

Equal to

None

__________ is a cubic pattern having one extra atom or molecule at the centre of each of the six faces of the cube

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Simple cube

Face centered cube

Body centered cube

None of these

Conductors are those materials in which the free electrons

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Very large

Very small

Plenty of

None of these

Fire optics has ability to transmit

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Thousand telephone conversation

Several television programs

Numerous data signals between stations

All of these

Two bodies of mass 1 kg and 2kg have equal momentum.Then the ratio of their kinetic energies is

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2 : 1

3 : 1

1 : 3

1 : 1

Flux coming out from a unit positive charge placed in air is

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ε_°

ε_°^-1

(4πε_°)^-1

4πε_°

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

A wire is stretched to double of its length. Its train is:

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2

1

0

0.5

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

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