Question # 1

A virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

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

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

Laws of motion are not valid in a system which is

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inertial

non-interial

at rest

moving with uniform velocity

The electric field will be uniform

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Near a positive point charge

Near a negative point charge

Between two oppositely charged parallel metal plates

None of above

The voltage increases linearly with

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time

velocity

acceleration

torque

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

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

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is:

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1.25 J

12.5 J

125 J

None of these

If the K.E.of a body becomes four times of the initial value.then new momentum will

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Become twice its initial value

Become three times.its initial value

Become four times.its initial value

Remains constant

The direct conversion of sunlight into electricity through the use of semi conductor devices called

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Photo cell

Photo voltaic cell

Semiconductor diode

None of these

In a never system, the repeaters are placed at about

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50 km

75 km

100 km

125 km

The speed of the secondary wavelets as mentioned in Huygen's principle is ________ the speed of propagation of the wave itself

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Equal to

Greater than

Smaller than

None of these

The potential energy per unit charge is the unit of

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Flux

Electric intensity

Potential difference

None of these

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

The two forces of a couple do not follow the rule that

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They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

Multimode step index fibre has diameter as

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40 μm

50 μm

60 μm

None of these

A beam of light enters air from water.Which of the following characteristics of light will not change in water?

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Frequency

Wavelength

Velocity

Amplitude

The speed of flying bee is

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1 ms^-1

5 ms^-1

8 ms^-1

10 ms^-1

Layer of oil on water in sunlight appears coloured due to

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diffraction of light

dispersion

interference of light

polarization of light

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