Question # 1

The positron was discovered by:

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In cosmic radiation

In 1932

By Carl Anderson

All above

By direc

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Two vectors to be combined have magnitudes of 60 N and 35 N. Pick the possible answer:

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100 N

70 N

20 N

Zero

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

Direction of motion ______ in circular motion:

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Changes off and on

Changes continuously

Does not change

None of them

The speed of sound in a medium depends on

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The elastic property but not on the inertia property

The inertia property but not on the elastic property

The elastic property as well as the inertia property

Neither the elastic property nor the inertia property

Unit of universal gas constant is SI is:

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W K^-1 mol^-1

J/Nk^-1 mol^-1

Jk^-1 mol^-1

erg K^-1 mol^-1

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

When R_x and R_y are negative, the resultant lies in the third quadrant and its direction is

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θ = 180 + Φ

θ = 180 - Φ

θ = 90 + Φ

None of these

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

Negative and positive charge in a hollow sphere are equal in the number then flux from the surface will be

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Zero

Positive

Negative

Flux will be both negative and positive

In SI system the correct unit of Planck's constant is

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Kelvin

Js

Lux

Candela

Assuming the earth to be a sphere of radius 6400 km. What is the value of acceleration due to gravity at a height of 800 km above the surface of the earth ?

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5.35 ms^-1

6.35 ms^-2

7.35 ms^-2

8.35 ms^-2

To get high resolving power for a telescope one should use

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Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

The re conversion of light signals into electrical signals takes place due to

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Transmitter

Receiver

Generator

None of these

Bulk modulus is involved when the deformation is:

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One dimentional

Two dimentional

Three dimentional

Any of these

None of these

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