Question # 1

The unit of intensity of electric field is

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newton/coluomb

jule/coluomb

volt x metre

newton/metre

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

The average of A.C. current and voltage over a complete cycle is

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Maximum

zero

Neither zero nor maximum

None of these

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

Wien's constant is measured in:

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Metre per kelviin

Metre kelvin

Kelvin per meter

Joules

Dynes

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

None of these

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Distance covered during one vibration of an oscillating body in terms of amplitude A is:

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A

2 A

3 A

4 A

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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photoelectric effect

pair production

Compton effect

uncertainty principle

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

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

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

The quantity having dimension of ML²T⁰²will earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

A flowing liquid possess

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K.E

P.E

Pressure Energy

All

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

Bernoulli's equation is applicable for

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turbulent flow

streamline flow

both (a) and (b)

all kinds of flows

The system international (SI) is built from _______ kind of unites

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Two

Three

Four

Five

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