Question # 1

The efficiency of petrol engine is usually not more than 25% to 30% because of

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friction

heat losses

both of them

none of them

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

In a transistor, if the central region is p-type then this type of transistor is known as

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p-n-p transistor

n-p-n transistor

either of these

none of these

A potential barrier of 0.7V exists across p-n junction made from:

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Germanium

Silicon

Arsenic

Gallium

Indium

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

Resistance is measured in

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volts

ampere

ohm

watt

Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of

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very small energy

very large energy

frictional forces

acceleration due to gravity

In case of streamed lined flow of liquid, the loss of energy is

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Maximum

Minimum

Infinite

equal to what is in turbulent flow

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

Electric potential of earth is taken to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

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

Bernoulli's equation is based upon law of conversation

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Mass

Momentum

Energy

None of these

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

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

The waves moving from a sitar to a listener in air are

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Longitudinal progressive

Longitudinal stationary

Transverse progressive

Transverse stationary

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

We cannot utilize the heat contents of oceans and atmosphere because

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there is no reservoir at the same temperature

there is no reservoir at the temperature lower than any one of two

there is no reservoir at the temperature higher than any one of two

none of them

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

The electric flux through any surface depends upon:

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Intensity of electric field

Area of the surface

Angle between intensity and area

All of these

None of these

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of

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3 s

5 s

7 s

9 s

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

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