Question # 1

The work performed on an object does not depend on

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

The quantity have dimension of ML²T⁰²will have SI unit of:

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Watt

Newton

Joule

Metre

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

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Wave number

Frequency

Wavelength

Time period

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

The cause of mirage observed in deserts in bright sunlight is due to

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

The voltage increases linearly with

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time

velocity

acceleration

torque

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

For which color of light the refractive index of glass is larger

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Red

Green

Blue

Violet

The structure of the polymeric solid is:

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An ordered structure

A disordered structure

Intermediate between order or disorder

Any of these

None of these

In an optical fibre the speed of light is

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Directly proportional to its refractive

Inversely proportional to its refractive inedex

Independent of refractive index

Directly proportional to square of refractive index

For glass-air boundary the critical angle θ_c is

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30^o

41.8^o

42.0^o

44.0^o

At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:

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Double

Remains constant

Half

None of these

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of incident light

Metal surface

Both frequency of incident light and metal surface

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All expect A

The gravitational acceleration decreases inversely as the distance from the centre of the Earth is

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Square

One time

Three times

None of these

A radioactive substance has a half-life of 4 months. Three-fourths of the substance will decay in:

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5months

6months

8months

7months

Paramagnetic substances are those in which

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Spin and orbital motions are supported

Spin and orbital motions are opposed

Spin and orbital motions supported a little

None of these

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

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