Question # 1

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

Two wires of same material have lengths L and 2L and cross-sectional area 4A and A respectively. the ratio of their specific resistance would be:

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1: 1

1: 8

8: 1

1: 2

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

The unit of work function is

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eV

Volt

Farad

Herdz

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

The value of young's modulus is maximum for:

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Dimond

Copper

Ice

Mercury

Water

The study of fluids is relatively complicated, this can be simplified by using

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

a and b

The magnetic fields produced by electron in an atom is due to

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Spin motion

Orbital motion

Both a & b

All above

The maximum size of an object as seen by the naked eye is obtained when it is placed of

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Far point

Near point

Distant point None of these

A negative sign is assigned to quantities where direction is opposite to that of

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final velocity

initial velocity

instantaneous velocity

all of them

One angstrom equal:

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10^-8m

10^-9m

10^-10m

10^-11m

The centre of gravity of a body of an irregular shape lies

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At its centre

inside the surface

At the intersection of medians

All of these

Base quantities are those which

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Remain the same

Can be derived

Further divided

None of these

When the length of a microscope tube increases its magnifying power

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Decreases

Increases

Does not change

May increase or decrease depending on the observer and the place of observation

All changes which occur suddenly are irreversible through

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Conduction

Convection

Radiation

All of these

The repulsive force between the two electrons at a distance of 4 m is

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1.7 × 10^-15 N

2.4 × 10^-18 N

1.44 × 10^-29 N

1.9 × 10^-30 N

The energy gap is insulators becomes very large and has the value

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Few electron volt (eV)

Some electron volt (eV)

Several electron volt (eV)

None of these

Which of the following quantities is / are scalar ?

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Dipole moment

Electrical permitivity

Electric field

Electrical potential

A stress which decreases the stress along one dimension is known as:

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Compressive stress

Tensile stress

Linear stress

Both (B) and (C)

If the acceleration due to gravity at the earth's surface is 9.8 m/s² and the mass of the earth is 80 times that of moon and radius of earth 4 times that of moon,the value of G at the moos's surface will be:

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9.8 m/s²

1.96 m/s²

4.9 m/s²

None of above

If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to

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R = N × m

R = N/m

R = m/N

R = N × m²

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

When a body is subjected to some external force, deformation is produced in:

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Shape

Length

Volume

Any of these

None of these

When body is at rest or rotating with uniform angular velocity is has

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Zero angular acceleration

Rotationaly equilibrium

Zero torque

All are correct

A point source in a homogeneous medium gives rise to:

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A plane wavefront

A spherical wavefront

A cylindrical wavefront

An elliptical wavefront

The cross product of parallel vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s².The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

When two light waves travelling in the same direction are out of phase at any point, their resultant amplitude

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increases

decreases

remains unchanged

increases rapidly

Blood is an incompressible fluid having density nearly equal to

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Milk

Honey

Water

None of these

Nm^-2is approximately called:

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Telsa

Weber

Pascal

Watt

Guass

Every point of a wavefront may be considered as a

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Source

Source of wavefront

Source of secondary wavefront

None of these

A point on the surface of the mirror where principle axis meets is called

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Focus

Centre of curvature

Pole

Aperture

The position of a new wavefront after a certain interval of time can be found by constructing a surface that is

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A tangent

A tangent envelope

Curved surface

None of these

The ability of body to return to its original shape (after the force is removed) is called:

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Elasticity

Ductility

Stress

Strain

Any of these

A projectile is thrown at an angle of 30° with horizontal with a velocity of 980 m sec^-1. The time of flight to reach the highest point of its trajectory is:

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50 sec

100 sec

150 sec

250 sec

If the cover of a red book is observed in monochromatic blue light,It will appear

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White

Red

Black

Blue

A bullet is shot from a rifle.As a result the rifle recoils The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

Multimode graded index fibre core has diameter of

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40-200 μm

50-1000 μm

50-150 μm

50-300 μm

An inertial frame of reference in which acceleration is

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Very high

Very very low

Zero

None of these

The right hand rule is applied to find

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The direction of a vector obtained by the vector product of two vectors

The magnitude of the vector obtained in the above manner

Neither the direction nor the magnitude

None of these

In deriving Bemoulli's equation, it is assumed that the fluid is

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Incompressible

Non-viscous

In a steady state

All of these

The pressure will be low where the speed of fluid is

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Zero

High

Low

Constant

In the measurement 12.7 measures

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One accurately known digit

Tow accurately known digit

Two accurately known digit and one doubtfull

None of these

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

Bulk modulus for bass is

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20

41

61

81

The dimension of elastic modulus

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ML^-1T²

MLT²

ML^-1T²

MLT³

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

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2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Become zero

Remain constant

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

In Milikan's experiment, we find the e/m for

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Atom

Electron

Proton

Neutron

The age of universe is

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5 x 10¹⁷ sec

1.4 x 10¹⁷ sec

3.2 x 10⁷ sec

8.6 x 10⁴ sec

Frequency of red colour as compared to that of violet colour is:

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Equal

Smaller

Greater

None of these

When the movable mirror moves, the distance λ/4 the total path difference would be

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2λ

λ

2λ/4

None of these

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

When a droplet falls through a medium with terminal velocity the acceleration is

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Maximum

Minimum

Constant

Zero

The speed of light in other material is always

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Greater than c

Less than c

Equal to c

None of these

Work done by centripetal force is

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Maximum

Minimum

Zero

None

Michelesion's interferometer is an instrument usually used to measure

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intensity of light

speed of light

wavelength of light

dispersion of light

When the both conditions are satisfied, then there is no

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Linear acceleration

Angular acceleration

Linear acceleration and angular acceleration

None of these

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

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Young's modulus

Bulk modulus

Shear modulus

all of them

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

When θ = 0 in relation d sinθ = λ, the path difference between the rays coming out from the slits of the grating will be zero. So the image in this directions is

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Dark

Bright

Non image formed

None of these

The ultimate tensile strength of the material can be regarded as

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Maximum strength

Nominal strength

No strength

None of these

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

Acceleration greater than g

The equation of continuity of fluid is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

All of these

When there are number of forces acting on a body and the body is

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At rest

Motion

Rest or moving with uniform velocity

None of these

What is the main cause of the shinning of diamond?

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Reflection

Refraction

Total internal reflection

Dispersion of light

An electron and proton are placed a distance r apart in air the ratio of the electro static force to gravitational force between them is of the order of

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10³⁷

10³⁸

10³⁹

10⁴⁰

the ratio of mean K.E of chlorine and oxygen molecules at same temperature is

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16 35.5

35.5 16

(35.2)²16

1 1

Michelson's interferometer is an instrument used to measure the distance with

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Precision

High precision

Extremely high precision

None of these

In metallic crystals which of the following thing remains constant?

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

The value of Boltzman constant is

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1.28 x 10^-22JK^-1

1.38 x 10^-23JK^-1

1.38 x 10^-28JK^-1

1.35 x 10^-29JK^-1

The angular speed of a flywheel making 120 revolutions/minute is:

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π rad/s

2π rad/s

4π rad/s

6π rad/s

The vertical and horizontal range will be equal if angle of projection is

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76°

45°

60°

120°

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are

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5

7

9

14

A 70 kg man runs up a long height of stairs in 4.0 sec. The vertical height of the stairs is 4.5 m. Calculate its power output in watts

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7.1 × 10³ W

7.2 × 10² W

7.3 × 10² W

7.7 × 10² W

If rope of lift breaks suddenly,The tension exerted by the surface of lift is (a = Acceleration of lift)

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mg

m (g + a)

m (g - a)

0

A chocolate cookie is a circular disk of diameter 8.5 ± 0.02 cm and thicknes 0.050 ± 0.005 cm the average volume in cm³ is

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2.83 ± 0.3

2.38 ± 0.27

11.35 ± 1.2

9.31 ± 1.12

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

The temperature at which the reading of Fahrenheit thermometer will be double that of a centigrade thermometer is

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160°C

180°C

140°C

100°C

A cell of negligible resistance and e.m.f 2 V is connected across a series combination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is

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0.6 V

1/3 V

2/3 V

4/3 V

The atoms molecules or ions in a crystalline solids are at room temperature

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Motionless

Vibrate violently

Fixed

Simply vibrate

Assuming the earth as a sphere of radius 6400km the capacitance of earth is

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Infinite

Zero

771 μF

171 μF

The magnitude of work is

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W = Fd cos θ

W = Fd

W = dF cos θ

All of these

The dimensions of Planck's constant is equal to that of

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Energy

Momentum

Angular momentum

Power

Under normal circumstances the volume of the blood is sufficient to keep the vessels

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Inflated all the time

Deflated all the time

Contracted all the time

Squeezed all the time

The moment of inertia plays the same role in angular motion as in linear motion as

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Density

Weight

Mass

None of these

In a experiment to determine acceleration due to gravity by simple pendulum a student commits 1 % positive error in the measurement of length and 3 % negative error in the measurement of time period The percentage error in the values of g will be

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7%

10%

4%

3%

Which of the following is the most common method to obtain polarized light?

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selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

The S.I. unit of an electric flux is

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NmC^-1

NmC^-2

Nm² C^-1

Nm² C^-2

No of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

Curie temperature is a point where:

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Diamagnetism changes to paramagnetism

paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

paramagnetism changes to Ferromagnetism

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The locus of all the points in the same phase of vibration is called:

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Wave packet

Wavefront

Wave number

None of these

The transition from solid to liquid state is:

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Abrupt

Slow

Continuous

Discontinuous

Both A and D

If we have two vectors of magnitude 4 and 5 respectively and between them is 60°, what is magnitude of resultant

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4

8

2

3

In a uniform circular motion

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Velocity and acceleration remain constant

Kinetic energy remain constant

Speed and acceleration change

Only velocity change acceleration remain constant

The least distance of distinct vision for a normal eye is

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15 cm

25 cm

35 cm

1 m

Wavelength of a laser beam can be used as a standard of

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Time

Angle

Length

Temperature

The capacity of television channels INTELSAT VI satellite is

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2

3

10

20

Negative of vector can be made when

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Magnitude is made negative

Directions is reverse with negative magnitude

Only direction is changed

None of these

The first superconductor was discovered in

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1905

1911

19161

1920

Most widely used optical fibres are those which propagate light by

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total interval reflection

continuous refraction

both of them

none of them

The relation for the adiabatic change is

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PV = Constant

PV²= Constant

PV^r= Constant

PV^-r= Constant

Crystalline solids are in the form of:

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Metals

Ionic compounds

Ceramics

Both A and B

All of these

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

One second = ______.

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31 x 10^-8years

3.1 x 10⁸years

3.1 x 10^-8years

3.1 x 10^-18years

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The horizontal velocity component in projectile motion is

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Zero

Constant

Maximum

None of these

A steady current is flowing in a conductor of non-uniform cross-section. Thecharge passing through any cross-section per unit time is

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Directly proportional to the area of cross-section

Inversely proportional to the area of cross-section

Proportional to square of the area of cross-section

Independent of the area of cross-section

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

When a body moves in a circle the angle between linear velocity and angular velocity is

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180°

90°

45°

0°

The metals become electrically conducting due to their

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Ductility

Hardness

Structure

All of them

All real heat engines are less efficient than carnot engine due to

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Work substances

Friction

0 K

All of these

For assessment of total uncertainty when added or subtracted the absolute uncertainties are

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Multiplied

Divided

Added

Subtracted

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

The unit of coefficient of viscosity is

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kgm^-1s^-1

Nsm^-2

Poise

All of these

The velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

Steradian is a unit of

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Radius

Plane angle

Solid angle

None of these

If momentum is increased by 20% then K.E. increases by

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44%

55%

66%

77%

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

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Two times

Three times

Four times

Six times

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative intensities of the two sources

Distance between the slits

Wavelength

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

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Initial velocity

Variable velocity

Average velocity

None of these

A lift is moving up with acceleration equal to 1/5 of that due to gravity.The apparent weight of a 60 kg man standing in lift is:

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60 kg wt

72 kg wt

48 kg wt

Zero

If we go above the surface of earth equal to the radius of earth than value of g

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g

g/4

g/9

g/2

The conduction band in a solid

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may be empty

cannot be empty

should be filled

all of them

Polaroids are used in

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Sun glasses

The production and analysis of plane polarized light

Stereoscopic motion picture

All of these

Diffraction is concerned with the superposition of

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very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

The polarized can be achieved by using process like

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Coherent sources

Diffraction

Selective absorption

None of these

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither stress nor strain

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

A ray of light reflected from a dense medium under goes a phase change of:

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30°

60°

90°

180°

In a astronomical telescope the final image for normal vision is formed at

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The focal of the eye piece

The least distance of the distinct vision

The focus of the objective lens

Infinity

If a glass slab is placed in the path of a converging beam of light The point of convergence of light

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Moves away from the glass slab

Moves towards the glass slab

Remains at the same point

Moves straight

All the food you eat in one day has the energy equivalent to petrol of

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1/5 litre

1/3 litre

1/8 litre

1/6 litre

For maximum horizontal range, the angle of projection must be:

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0°

45°

60°

90°

The ratio of applied stress to volumetric strain is called

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shear modulus

Young's modulus

Bulk modulus

None of these

The transmitter in optical fiber system contains a device called

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LED

Diode

Transistor

None of these

The range of the diameter of core in multimode graded index fibre is

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50 to 100 μm

50 to 1000 μm

None of these

If stress is increased beyond the elastic limit and change in solid is permanent this behaviour is called

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Elasticity

Plasticity

Conductivity

Insulator

Modulus elasticity of any materiel is of the order of:

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10⁵

10²

10^-2

10^-5

10^-10

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

The dimensions of power are

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[ML²T²]

[ML²T^-2]

[ML²T^-3]

[M²LT^-3]

The ratio of fringes with for bright and dark fringes is

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1 : 2

2 : 1

1 : 4

1 : 1

Which branch of physics deal with the structure and properties of solids

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Atomic Physics

Plasma Physics

Molecular Physics

Solid state Physics

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

The relative permitivity ∈_r for transformer oil is

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2.9

3.0

2.1

2.4

Glass and high carbon steel are

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Brittle substances

Insulator

Ductile substances

None of these

Pure form of semiconductor is called

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Extrinsic semiconductor

Intrinsic semiconductor

N type

P type material

A bar of length L, cross-section A and Young's modulus Y, is pulled by a force F from both ends so as to produce an elongation x. Then:

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x∝1/L

x∝A

x∝1/A

x∝Y

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

A collision is said to be elastic during this collision

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K.E of the system remains conserved

momentum of the system remains conserved

total energy of the system remains conserved

all of them

When a horse pulls a cart the force that helps the horse to move forward is the force exerted by

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The cart on the horse

The ground on the horse

The ground on the cart

The horse on the ground

Bulk modulus for aluminium is

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40

70

75

95

The valence energy band can never be

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Filled

Partially filled

Empty

None of these

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

Ratio of dimensions of power and K.E is

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1 : 1

T : 1

1 : T

M : T

The SI unit of stress is same as that of.

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Momentum

Pressure

Force

Length

M.K.S. unit of pressure

Choose an answer

Atmosphere

Dynes per sq.cm

Meter

Pascal

When V₁ is approximately zero then Bernoulli's equation reduces to

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Torricelli's theorem

Venturi relation

Equation of continuity

None of these

Electrons move in the field from

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Low to high potential

High to low potential

Electric field to magnetic field

None of these

If a source of emf is traversed from positive to negative the potential change will be:

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Positive

Negative

Zero

Constant

For a fixed force, larger is the mass of a body

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Greater acceleration

Small acceleration

Same acceleration

None of these

Such substance which break soon after crossing the elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

According to the law of conversion of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

Area between the velocity time graph and time axis is equal to

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Speed of object

Distance covered

Velocity of the object

Acceleration

A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light?

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No change

Diffraction bands become narrower and crowded together

Bands become broader and farther apart

Bands disappear

A tank containing water has an orifice in one vertical side. If the centre of the orifice is 10 m below the surface level in tank, then velocity of efflux is

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44 ms^-1

14 ms^-1

10 ms^-1

49 ms^-1

Which pair includes a base unit and a derived unit

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Candela,mole

Joule,pascal

Kilogram,meter

Second Newton

The unit of Stefan Boltzman constant σ is:

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W/mK⁴

Cal/m³K²

W/m²K⁴

K/m²K⁴

Young's modulus for bone is

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10

15

20

25

nuclear physics deals with

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Atom

Atomic nuclei

Elementary particles

Light

The unit of inductance is equivalent to

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∨xs/A

∨xA/s

∨ x s/v

∨/A x s

In reversible process there is a reversed change in

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Working substance

Thermal

Mechanical

B and C

Position vector is a vector, which describes the

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Location of a point with respect to origin

Location of point with respect to any point

Location of a point with respect to some related point

None of these

A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:

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25 Hz

50 Hz

12.5 Hz

5Hz

The biological sciences deal with the

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Living things

Non-living things

Both

None of these

Young's modulus for brass is

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40

60

90

91

Which of the following gives volts as its unit

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Current/resistance

Power x current

Rate of flow of charge

emf of a cell

The mks unit of Mechanical Equivalent of heat is

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Joulex calorie

Joule/ calorie

Calorie x erg

erg/ calorie

The information carrying capacity in an optical fibre is called

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wavelength

frequency

bandwidth

none of them

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

Change in momentum per second is:

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Product force and time

Product of pressure and area

Ratio of pressure and area

None of these

The curie temperature for iron is

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750°C

570°C

750°k

57°K

Zero order image formed by the grating when the angle the along the direction of normal to grating is

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Zero

90^o

180^o

None of these

The magnification is negative for

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Real image

Virtual image

Sometimes for real sometimes for real

Only for cancave lens

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

Conductors are those materials in which the free electrons

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Very large

Very small

Plenty of

None of these

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

For the same kinetic energy,the momentum is maximum for:

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An electron

A proton

A deuteron

An a particle

How many wave lengths of Kr⁸⁶ are contained in one meter

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1553164.13

652189.63

2347127.23

1650763.73

The dimensions of displacement is

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[ L ]

[ L²]

[ L³]

None of these

Newton's first law of motion is also known as

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Law of motion

Law of mechanics

law of inertia

None of these

Proportion of light in an optical fibre requires that the light-should be within the fibre

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Very little confined

Largely confined

Totally confined

None of these

Newtons laws are empirical laws, deduced from

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Theories

Experiments

Facts

None of these