Question # 1

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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momentum

charge

energy

mass

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

The value of relative permittivity of different dielectrics are:

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Equal

Different

Greater than one

Smaller than one

Both (B) and (C)

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

Relativistic mechanics is a branch of physics, which deal with the bodies moving with velocities:

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More then c

Approaching c

Equal to c

Much less than x

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

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capacitance

electric power

current

potential difference

Stoke;s law is not applicable when the speed of the object moving through a fluid is:

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Zero

Small

Large

None of these

The angular momentum is a vector quantity with due

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Perpendicular to the axis of rotation

Along the axis of rotation

At the axis of rotation

None of these

Electron volt is a unit of

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Potential difference

Energy

Charge

Power

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

Consider telecommunication through optical fibers.Which of the following statements is not true?

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Optical fibers may have homogeneous core with a suitable cladding

Optical fibers can be of graded refractive index

Optical fibers are subject to electromagnetic interference from outside

Optical fibers have extremely low transmission loss

What is the radial acceleration, when a space ship is accelerating towards the centre of the Earth at all times is

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2 g

g

1/2 g

1/4 g

Gaussian surface may be

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Spherical

Rectangular

Any shape

None of these

By dimensional analysis, we can find

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Correctness of formula

Derivation of formula

Physical nature

All of these

The ballistic missiles are useful only for

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long ranges

short ranges

medium ranges

none of them

A cane filled with water is revolved in a vertical circle of radius 4 m and water just not fall down The time period of revolution will be nearly

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1 s

4 s

8 s

10 s

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

When a plane polarized light is passed through certain crystals they

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Are totally absorbed

Are totally reflected

Rotate the plane of polarization

None of these

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