Online Test

Question # 1

Equal charges are given to two spheres of different radii,The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

Which of the following can become a good permanent magnet?

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iron

steel

both of them

none of them

pgh in Bernoulli's equation has unit of

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Volume

Force

Work/Volume

None of these

Photodiode is always operated in the

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Forward condition

Reverse condition

Both

None of these

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

Neutron is assumed to be made up of quarks

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One down two up

One up two down

Two down two up

None of these

Sound travels faster in

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Hydrogen

Helium

Kerosene oil

Steel

The energy of characteristic X-rays depends upon the

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Voltage applied

Type of target

Temperature

None of these

The angle θ gives the states of the system its

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Vibrational cycle

Phase of vibration

Position of the particle in a circle

All of these

One rad (radiation absorbed dose) is

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0.01 Gray

0.03 Gray

0.05 Gray

None of these

Every gas behaves like an ideal gas at

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High temperature and low pressure

Low temperature and high pressure

Both A and B

None

A substance which have empty conduction band is called

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Conductor

Insulator

Semiconductor

None of these

Shunt resistance is called

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By pass resistor

Specific resistance

Reactance

None of these

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decreases

The density of blood decrease at high altitudes

In modulation process carrier waves combine with

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High frequency signal

Low frequency signal

Very low frequency

None of these

When we jump out of a boat standing in water moves

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Forward

Backward

Sideways

None of these

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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Plasticity

Breaking point

Proportional limit

Strain

In d.C. motor, the field coils with the armature coils are connected

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In parallel

In series

Both

None of these

A particle performs simple harmonic motion find its maximum speed if its amplitude is 0.10 m and frequency 5.0 Hz

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9.08 ms^-1

5.50 ms^-1

1.25 ms^-1

3.14 ms^-1

Average radiation doses by wearing radioactive luminous watch for a year is

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10 m Sv

30 m Sv

60 m Sv

70 m Sv

Liver absorbed mostly the chemical which is

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Iron

Cobalt

Iodine

None of these

When the particles of medium vibrate about their mean position, along the direction of motion of the waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

The energy band gap is maximum in

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Metals

Superconductors

Insulators

Semiconductor

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

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Polarization

Deflection by electric field

Interference

Diffraction

A wire 1 m long moves at 5 ms^-1 perpendicular to a uniform magnetic field of the intensity if 0.02Ω Wbm^-2 The potential difference induced across the ends of the wire is

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0.01 V

0.1 V

1.0 V

10 V

Form the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

The results of mechanical tests are usually represents in terms of:

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Stress

Strain

Both A & B

None of these

Newtons laws were published in

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1587

1687

1787

1678

Another name for electric potential energy per unit charge is given by:

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Electric intensity

Potential gradien

Electric flux

Potential difference

None of these

The resistance of ideal voltmeter is

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Zero

Infinite

Very small but not zero

Equal to resistance of galvanometer

When two deuterons are merged to form a helium. The energy released during this process is

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15 MeV

20 MeV

24 MeV

28 MeV

A ballistic missile is

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Unpowered

Unguided

Both

None of these

Kinetic energy of rotation of the whole body is

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K.E._rot = lω

K.E._rot = lω²

K.E._rot = l²ω²

None of these

When charged particle is projected perpendicular to a uniform magnetic field its trajectory is

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circular

elliptical

cycloid

straight line

β-rays are infact fast moving electrons coming out from the

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Outside the nucleus

Inside the nucleus

As free electrons

None of these

Exclusive NOR gate can be obtained by inverting the output of

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XOR gate

NOT gate

AND gate

None of these

Range of β-particle in air is

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10 cm

1 meter

Several meters

None of these

Quenching gas in Geiger counter:

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He

Ne

Kr

Br

The brightness of the spot formed on the screen is controlled by the

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Electron

Proton

Potential

None of these

In common emitter amplifier. When small signal voltage is applied at the input it changes the voltage at

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base

Emitter

Collector

None of these