Online Test

Question # 1

The mass of an-electron in unified mass scale is

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0.00065 U

0.00055 U

1.004 U

0.00075 U

Ammeter is used to measure

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voltage

resistance

voltage and current

current

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

How many radiations are coming out of a radioactive element

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α

β

α,β

α,β,γ

The light signal in an optical fibre requires that the light should

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be partially confined within the fibre

be totally confined within the fibre

not be confined within the table

none of them

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitude wave

Transverse wave

No vibration at all

None of these

Loud music produced by sounding wooden boards of string instruments

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Free oscillation

Forced oscillations

Simple oscillations

None of these

The particles equal in mass or greater than protons are

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Baryons

Leptons

Mesons

None of these

Blood is an/a

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Ideal fluid

Perfect fluid

Compressible fluid

Incompressible fluid

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

de-Broglies hypothesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

Which gate corresponds to the action of parallel switches

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OR gate

NOR gate

NAND gate

AND gate

The relation for impulse can be written as

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F × t = mv_i - mv_f

F × t = mV

F × t = mV_f - mV_i

None of these

The approximate efficiency of steam turbine is

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35 - 46 %

40 - 43 %

29 - 36 %

30 - 47 %

Unit of product of 'RC' is:

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volt

farad

ohm

second

A body of mass 5 kg initially at rest is moved by a force of 2 N on smooth horizontal surface.The work done by the force in 10 s is

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20 j

30 j

40 j

60 j

The range of β-particle is measured by the

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Effective depth of penetration

Length of erratic path

Unbroken lengths

None of these

What temperature is the same on Celsius scale as well as on Fahrenheit scale?

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32°C

-32°C

-40°C

-212°C

Which of the following properties is not exhibited by X-rays

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Polarization

Deflection by electric field

Interference

Diffraction

The dielectric constant K of an insulator cannot be

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2

10

5

∞

Why is core of transformer made of iron

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Iron is good electrical material

Iron is cheaper

Iron is easily magnetise and demagnetise

None of these

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

The magnitude of j² in cross product is

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Zero

1

Greater than 1

Less than 0

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The Induced e.m.f is produced in a circuit due to:

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Initial magnetic flux through the circuit

Final management flux through the circuit

The change of magnetic flux through the circuit

None of these

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

The dimensions of velocity are

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[ LT ]

[ LT²]

[ LT^-1]

[ LT^-2]

If a spring of force constant k is cut into two equal parts which are then joined parallel to each other The force Constant of the combination will be

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4k

6k

5k

3k/2

Which of the following quantity is expressed as force per unit area?

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Work

Pressure

Volume

Area

If length of seconds pendulum on the surface of earth is 1 m them length of second pendulum on surface of moon is

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1/6 m

6 m

1/36m

36m

The frequency of modulated carrier waves is highest when the signal amplitude is at its

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Lowest value

Maximum positive value

Maximum negative value

None of these

All points on a rigid body rotating about a fixed axis have

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Same angular displacement

Same angular acceleration

Donot have angular speed

None of these

The current passing through the inductance due to potential difference across it is

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I = I_o cos 2π ft

I = I_o cos π ft

I = I_o sin 2π ft

None of these

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron hole is generated

all of them

For the treatment of skin cancers, the isotopes/isotopes are used

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Phosphorous-32

Strontium-90

Both

None of these

A process which is carried at constant temperature and Boyle's law can be applied is called:

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Adiabatic process

Isothermal process

Isochoric process

None of these

A Carnot engine takes 300 cal of heat at 500 K and reject 150 cal of heat to the sink. The temperature of sink is

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1000 K

250 K

750 K

125 K

In reverse biasing condition the current flowing through the diode is of the order of

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mA

μA

KA

A

A galvanometer is an electrical instrument which can

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Measure current

Measure voltage

Phase

All of them

Can pair production takes place in vacuum because of conservation of

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Energy

Momentum

Momentum and Energy

None of these

If mean square velocity of gas molecules is doubled than pressure of gas

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Doubles

Four times

Remains same

None