Online Test

Question # 1

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet,its magnetic lines of force move from north pole of a magnet towards south pole

The process of liquefaction and evaporation of a substance performed slowly are

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Reversible

Practically reversible

Not reversible

None of these

The most widely used reactor in the world are

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Fast reactors

Pressurized water reactors

Research reactor

None of these

In generators, the back motor effect produces due to

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Opposite forces

Parallel forces

Perpendicular forces

None of these

Which of the following statements for an object in equilibrium not true?

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The object must be at rest

The object can be at rest

The object is moving at constant

The acceleration of the object is zero

Ductility is the property of a substance in which a material undergoes the deformation as

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Elastic deformation

Plastic deformation

Shear deformation

None of these

The percentage errors in the measurements of mass and speed are 2% and 3% respectively.How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed.

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11%

8%

5%

1%

At low temperature, the body emits long wavelength is the region

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Infra-red

Ultraviolet

Far-Ultraviolet

None of these

A lift os descending at a constant speed V. A passenger in the lift drops a coin.The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

When the pn-junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few mili ohms

The nature of thermal radiation is smaller to:

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Ultraviolet rays

Light rays

Both of them

None of these

The value of constant 'γ' for mono atomic gas is

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1.40

1.67

1.28

1.29

During the positive half-cycle in the half-wave rectification, the diode

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does not conduct

conducts

either of them

neither of them

CRO deflects the beam of

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protons

alpha particles

electrons

neutrons

The time period of a system executing simple harmonic motion depends upon

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Amplitude

Force constant

Mass

b and c

With increase in temperature the viscosity of

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Both gases and liquid increase

Both gases and liquid decrease

Gases increases and of liquid decrease

liquid increases and of gases decreases

The half-life of ratio-active element depend on

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Temperature

Pressure

Nature of element

Amount of radioactive substance

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

Which shift show that universe is expanding

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Yellow shift

Blue shift

Red shift

Green shift

The torque is taken as negative when it is

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Clockwise

Anticlockwise

Both

None of these

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall.This is due to the fact that his voice.

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

From scaning electron microscope, remarkable quality can be achieved having the image of

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One dimensional

Two dimensional

Three dimensional

None of these

Stationary waves are the superposition of two waves moving along a string but

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In same direction

In opposite direction

Both

None of these

The product of moment of inertia and angular velocity is called

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Angular momentum

Kinetic energy

Torque

Work

Phenomenon of interference and diffraction support the:

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Quantum nature of light

Tranverse nature of light

Wave nature of light

Complex nature of light

For an ideal gas system, the internal energy and temperature are

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Directly proportional

Inversely proportional

Neither direct nor inversely proportional

None of these

Neutron was discovered in

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1915

1920

1925

1932

Slope of velocity time graph is

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Speed

Work

Power

Acceleration

Velocity is a

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Scalar quantity

vector quantity

constant quantity

none of them

Gamma rays consist of stream of

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electrons

protons

photons

all of them

Radian is the unit of

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Solid Angle

Plane Angle

both a and b

None of these

A spring-mass system oscillates with a frequency v.if it is taken in an elevator slowly accelerating upward.the frequency will

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Increase

Decrease

Remains same

Become zero

β-particles is absorbed by

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1 ~ 5 mm of Al sheet

5 ~ 10 mm Al sheet

3 mm of Al sheet

None of these

The number of neutron in the following nucleus are ₈O¹⁷

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8

17

7

25

None

The drag force F on a sphere of radius 'r' moving slowly with speed V through a fluid of viscosity η by Stake's law

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F = πηra

F = 6πηrω

F = 6πηrV

F = 6πηraV

At what place motion of simple pendulum will be slowest

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Poles

Equator

At the centre of the earth

None of these

A spectrometer is an optical device used to study the spectra from different sources of light which is

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Absorption spectra

Emission spectra

Discrete spectra

None of these

If R is gas constant for I gram mole C_p and C_v are specific heat for a solid then

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C_p - C_v = R

C_p - C_v < R

C_p - C_v = 0

C_p - C_v > R

A small metallic sphere is dropped in a long jar of honey, it will move as

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Float in jar

It will move with g

Fall with acceleration less than g

Grain terminal velocity

Hooks law hols within

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Proportional limit

Elastic limit

Plastic limit

None

Electric intensity at a place due to charge conductor is a:

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Scalar quantity

Vector quantity

Semi-vector and semi- scalar

Dimensionless quantity

Both A and D are true