Question # 1

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

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Infinite

Zero

771 μF

171 μF

Calculate entropy change when 1.0 Kg ice at 0°C melts into water at 0°C. Latent heat of fusion of ice L_f= 3.36 x 10⁵J Kg^-1

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1.18 x 10²JK^-1

1.20 x 10⁴J Kg^-1

1.23 x 10³JK^-1

1.23 x 10⁴J Kg^-1

Multimode step index fibre is useful for

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short distance

long distance

both a and b

none of them

The transition of from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

Solids which have no regular atomic structure are called

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Crystalline solid

elastic solid

Glassy solid

All of these

A Gaussian surface is always an imaginary

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Open surface

Closed surface

Both

None of these

A pure semiconductor has:

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An infinite resistance at 0^oC)

A finite resistance which does not depend upon temperature

A finite resistance which decreases with temperature

A finite resistance which increase with temperature

What is the radial acceleration, when a space ship is accelerating towards the centre of the Earth at all times is

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2 g

g

1/2 g

1/4 g

Which optical fibre is used for shorter distances only?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

all of them

The typical speed of Moon around the Earth is

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1000 ms^-1

2000 ms^-1

3000 ms^-1

4000 ms^-1

The fusion of hydrogen into helium is more likely to take place:

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At high temperature and high pressure

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

Internal friction of a fluid is called

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Surface tension

Resistance

Viscosity

None of these

Wb/m² is equal to

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Henry

Watt

Tesla

Dynes

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 projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

For single slit diffraction the first minimum occurs when

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dsinθ = λ

dsinθ = λ/2

dsinθ = 2λ

dsinθ = mλ

The doped semi-conductors materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

The magnitude of the scalar product is

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AB sin Φ

AB cos Φ

AB

None of these

Substances which undergo plastic deformation until they break, are known as

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brittle substances

ductile substances

plastic substances

neither of them

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

The approximate efficiency of liquid fuel rocket is

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49%

50%

48%

47%

Young's modulus for aluminium is

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30

70

80

100

Bulk modulus for copper is

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50

75

140

147

The fractional change in volume per unit increase in pressure is called:

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Bulk modulus

Compressibility

Pressure coefficient

Volume coefficient

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

A person standing on a rotating platform has his hands lowered.He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

Successive dark and bright fringes are formed each time the moveable mirror in Michelsion's interferometer is moved a distance

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λ/2

λ/4

λ

3/2λ

The cause of power loss in optic fibre is

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Absorption

Scattering

Dispersion

All

The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

The fringe spacing in case of red light

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Increases

Decreases

Remains the same

None of these

The unit of intensity of electric field is

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newton/coluomb

Joule/culomb

Volt x metre

Newton/meter

In YDS experiment, condition for constructive interference is that path difference is equal to

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nλ

mλ

(n + 1/2)λ

(m + 1/2)λ

In an inkjet printer, the toner drops are

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Charged

Not charged

Charged and deflected

None of these

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

Angular momentum is

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A scalar

A vector

Neither A.nor B.

Either A.or B.

The angle between the vector 2i + 2j and the y-axis is

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Tan^-1 (3/2)

Tan^-1 (2/3)

Sin^-1 (2/3)

Cos^-1 (3/2)

The more general form of second law of motion is

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F = ma

F × t = mV_f - mV_i

Both

None of these

A collision in which the K.E. is not conserved is called

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Elastic collision

Inelastic collisiion

Both

None of these

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

Earth-sun travel around the galaxy is

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220000 ms^-1

230000 ms^-1

210000 ms^-1

200000 ms^-1

The angle subtended at the center of sphere by an area of its surface equal to the half of square of its radius is

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1 sr

2 sr

1/2 sr

none of these

An optical fibre with its protective case may be typically 6.0 mm in diameter and yet it can replace bundle of copper of diameter

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6.79 cm

6.95 cm

7.52 cm

7.62 cm

A body is dropped from a tower with zero velocity reaches ground in 4 seconds.The height of tower is about

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80 m

20 m

160 m

40 m

The junction potential for Germanium is;

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3v

0.3 v

7v

0.7 v

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

When the deformation produced in the material becomes permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

If m means mass of gases ejected per second from a rocket and v shows the change in velocity, then mv is named as:

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Force

Energy

Work

Impulse

Above a certain velocity the fluid flow, the motion of the fluid becomes

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Steady

Unsteady

Irregular

b and c

Ordinary light has components of vibration in

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One direction

Different direction

All directions

None of these

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

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76°

45°

60°

120°

Which of the given quantity is a vector

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Pressure

Momentum

Kinetic energy

Volume

The work done by the gas during the isobaric expansion is equal to

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Area of rectangle

Area of triangle

Area of parallelogram

None of these

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

The sum of all energy of all molecules atoms in an object is known as

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Temperature

Entropy

Internal energy

None of these

In which process the P - V diagram is a straight line parallel to volume axis

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Isobaric

Isothermal

Isochoric

Adiabatic

Suppose the water flows out from a pipe at 3 kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

For assessment if total uncertainly in case of division

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Absolute uncertainly are added

Absolute uncertainty are subtracted

Percentage uncertainties are added

Percentage uncertainties are substracted

For which color of light the refractive index of glass is larger

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Red

Green

Blue

Violet

For the conversion of heat into work, the two bodies are essential as temperature which is

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Similar

Very little difference

Large difference

None of these

A student measured the diameter of a wire using a screw gauge with least count 0.001cm.The correct measurement is

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5.3 cm

5.32 cm

5.320 cm

5.3200 cm

The SI units of displacement is

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m

kg

ms^-1

None of these

Coplanar forces are those, which act on a

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Single plane

All planes

Common plane

None of these

A body is in its state of stress when it is

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Displaced from its equilibrium position

Remains at rest when shape changed

Their angles change

All of them

A null vector is defined as zero magnitude and its direction is

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Specific

Arbitary

Undefined

None of these

Bulk modulus for lead is

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2.9

7.7

9.3

15.6

The unit of focal power of a lens is

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Watt

Horse power

Dioptre

Kilo watt

For a normal AC cycle, during T/2 to T the diode act as:

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Open switch

full wave rectifier

Close switch

All are correct

In SI system the correct unit of Planck's constant is

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Kelvin

Js

Lux

Candela

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

An accurate measurement is the one which has

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Percertainity

Less percentage uncertainty

Less fractional uncertainty

b and c

A line normal to the wavefront including the direction of motion is called

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perpendicular line

parallel line

a ray of light

none of them

If solid sphere and solid cylinder of same mass and density rotate about their own axis,the moment of inertia will be greater for

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Solid sphere

Solid cylinder

Both

Equal both

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

Rate of change of momentum is called

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impulse

force

torque

momentum

Diffraction of light occurs, due to the interference between rays coming from the same wavefront of

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The same parts

The different parts

Mixed rays

None of these

A person moves 30m north then 20m east then 30√2 m south west His displacement from the original position is

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14 m south west

28 m south

10 m west

15 m east

The time taken by the light to travel from Sun to Earth is

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4 min 20 sec

5 min 20 sec

8 min 20 sec

9 min 20 sec

Strain is defined in terms of:

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Formation

Deformation

Area

Newtons

None of these

The rater of flow is measure in

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Liter-sec

Liter/sec

Liter/sec²

Sec/liter

The black dry powder sprayed over the drum of photo copier is

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Neutral

Positively charged

Negatively charged

None

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

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Light year is the unit of

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Speed

Mass

Distnace

Time

According to Stoke's law drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

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 escape velocity of Earth in Kms^-1

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9.75

11.2

12.3

15.6

The orbital angular momentum is associated with the motion of a body

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Rotating body

Revolving body

Along a circular path

None of these

The engine of a car produces acceleration of 4 m/s²in the car.If this car pulls another car same mass,what will be the acceleration produces in m/s²

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2

8

4

12

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

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

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Semiconductor

Conductor

Insulator

Dielectric

For the measurement of temperature of the order of 400°C, we will prefer

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Hg thermometer

Alcohol thermometer

Pyrometer

Thermometer

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

A unit vector is defined as

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Whose magnitude is one

Show the given direction

Opposite direction

a and b

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

The equation representing the inter conversion of matter and energy is written as

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E = mc

E = mc²

E = mc³

None of these

If we keep the moment arm constant and increase the applied force, then the torque will

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remain the same

decrease

increase

all of them

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rats

Thermal radiation

None of these

Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^-10m?

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microwave

infrared

ultraviolet

X-ray

Which part of the spectrum is most visible?

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Red

Violet

Yellow

Yellow-green

Ratio of dimensions of power and K.E is

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1 : 1

T : 1

1 : T

M : T

When an electric field is strong the lines are

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Farther

Closer

Parallel

All of them

The angle between rectangular components of a vector is

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0°

60°

90°

120°

In which situation does diffraction occur?

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a wave bounces back from a surface

a wave meets another wave to produce a new wave

a wave passes from one medium into another

a wave passes through an aperture

Newtons third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

According o Einsteins theory space time is

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Just coordinates

A straight line

Curved

None of these

Wave length of red colour as compared to that of violet colour is:

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Smaller

Longer

Equal

None of these

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angel as well as velocity of projection

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

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young;s modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized.

By convention, the torques are taken as positive if they are in the

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upward direction

rightward direction

clockwise direction

anticlockwise direction

Two forces of 12 N and 8 N act upon a body.The resultant force on the body has a maximum value of:

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4 N

0 N

20 N

8 N

Laws of reflection and refraction can also be explained by:

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

When m₁= m₂, the velocities of both bodies become

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V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

The Bernoulli's equation is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

None of these

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

Solid state Physics is the branch of physics deals with the

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Atoms and molecules

Structure

Properties

b and c

The young s modulus for a perfect rigid body is

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Zero

1

Infinite

None of these

Universal gas constant has the unit of

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Newton/°C

Newton/K

J/mol K

Watt/kelvin

If Young s double slit experiment is immersed in water then the fringes with

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Decreases

Remains unchanged

Becomes infinite

Increases

Within each domain, the magnetic fields of all the spinning electrons are

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parallel

antiparallel

perpendicular

all of them

A typical diffraction grating has lines per centimeter

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10 to 100

100 to 1000

1000 to 5000

400 to 5000

For an adiabatic expansion of a gas which of the following statement is false?

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Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

A spectrum which contains all wavelengths without any break is called

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Emission spectrum

Line spectrum

Continuous emission spectrum

All of them

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

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0.8 Curie

0.1Curie

0.4 Curie

0.16 Curie

Under a constant torque,the angular momentum of a body changes from A to 4A second find the torque.

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(3/4)A

(1/4)A

3A

(4/3)A

A unit vector may be defined by the

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Surface

Direction by normal drawn vector

Along the direction of surface

a and b

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The expression of energy stored in an inductor of length L and current I can be expressed by a relation

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1/2 LI²

1/2 I²L

1/2 I²L²

1/2 IL

Substances which undergo plastic deformation until they break are called:

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Ductile

Brittle

Malleable

Soft

Hard

At what point/points in its path does a projectile have it minimum speed ?

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

Why the toner is given a negative charge to the drum

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To spread over the drum

To stick the writing

To neutralize writing

None of these

The work done in moving a positive charge of two coulombs from one point to another point when the potential difference between them is 5 volt.

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5 Joules

10 Joules

15 Joules

20 Joules

An electron of charge e coulomb passes through a potential difference of V volts,its energy in 'joules' will be

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V/e

eV

e/V

V

Linear momentum is a vector quantity and has direction of

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Its displacement

Velocity

Acceleration

None of these

Work done is a gravitational field along a closed loop is

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Maximum

Minimum

1

Zero

A pulsating DC can be converted into constant voltage by using

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Filter

Full wave rectifier

Half wave rectifie

Bridge rectifier

The weight of the body at the centre of the earth is

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9.8 N

Zero

19.6 N

None of these

Young's modulus for brass is

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40

60

90

91

The appearance of colours in the shape (or oil) film results from:

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Dispersion

Interference

Reflection

Refraction

When the light is incident on polarizing angle which of the following is completely polarized?

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Reflected light

Refracted light

Both reflected and refracted light

Neither reflected nor refracted light

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

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Fission reaction

Fusion reaction

Polymerization reaction

Any of these

None of these

Cladding in an optical fiber is used to

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Absorb unneccessary light

Produce total internal reflection

Transmit light

Filter light

The systolic pressure is

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120 torr

130 torr

150 torr

80 torr

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

Choose an answer

6 s

36 s

38 s

None of these

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

Spectrometer can be used to

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Measure wave length of light

Measure refractive index of the materials

Study spectra of light

All

If there were no intermolecular forces between gas molecules, the pressure due to a given sample a gas will be

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Increased

Decreased

Unchanged

None of these

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all material

a given material

all of them

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of incident light

Metal surface

Both frequency of incident light and metal surface

A liquid flows through a pipe of non-uniform cross-section. If A1 and A2 are the cross-section of the portions of the pipe at two points the ratio of velocities of liquid at these points will be

Choose an answer

A₁A₂

A₁/A₂

1/A₁A₂

A₂/A₁

Amorphous solids are called

Choose an answer

Polymeric

Crystal

Glassy solids

All

The sum of two forces acting at a point is 16 N.if the resultant force is 8 N and its direction is perpendicular to minimum force then the forces are

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6 N and 10 N

8 N and 8 N

4 N and 12 N

2 N and 14 N

The working of carburetor of a car uses

Choose an answer

Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

A 2 kg body and a 2 kg body have equal momentum. if the kinetic energy of 3 kg body is 10 j. The K.E of 2 kg body will be

Choose an answer

6.66 j

15 j

22.5 j

45 j

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

The wave nature of light was first proposed by

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Huygen

Thomas Young

Newton

Compton

The coordinate axes are those in which lines are drawn

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Parallel

Perpendicular

At right angle

All of them

Consult page 50 of your text and trick the correct statement.

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Velocity of x-rays is greater than velocity of light

Velocity of right light is less than velocity of radio waves

Velocity of light, x-rays and radio waves is the same

None of the above is correct

According to Huygen's principle, the new position of the wavefront after a time can be found by constructing a surface that touches all the

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primary wavelets

secondary wavelets

either of them

none of them

The discuss used by athletes has a mass of 1 kg, its weight in newtons is

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9.8 N

80 N

98 N

100 N

An are equal to radius of the circle subtended an angle of ______ at the center of circle

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1 rad

2 rad

π rad

1/2π rad

A typical rocket consumers fuel of about

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5000 Kgs^-1

10,00 Kgs^-1

10000 Kgs^-1

100000 Kgs^-1

When the velocity of a liquid flowing steadily in a tube increases,its pressure?

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Decreases

Increases

Remains same

Zero

The food which we eat in three days produces energy equal to energy from ____ liter of petrol

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1

1/3

3

9

The motion in a plane is the motion in

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one dimensions

two dimensional

three dimensional

all of them

Sadi Carnot described an ideal engine using only isothermal and adiabatic process in

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1820

1825

1837

1840

Young's modulus for concrete is

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10

15

25

30

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

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0°

45°

60°

90°

What is the main cause of the shinning of diamond?

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Reflection

Refraction

Total internal reflection

Dispersion of light

Two wires of the same material have diameters in the ration 2 : 1 if they are stretched by the same force their elongations will be in the ratio

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8 : 1

1 : 8

2 : 1

1 : 4

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

When the car moves with constant acceleration, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

When R_x and R_y are negative, the resultant lies in the third quadrant and its direction is

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θ = 180 + Φ

θ = 180 - Φ

θ = 90 + Φ

None of these

Pascal is a unit of

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Mass

Power

Pressure

Intensity of light

In Michelsion's interferometer the path difference is varied by moving

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compensatory plate

moveable mirror

fixed mirror

telescope

The time of 30 vibrations of simple pendulum by stop water accurate upto one tenth of a second is 54.6 sec.

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1.82 ± 0.003 sec

2.82 ± 0.03 sec

2.82 ± 0.003 sec

None of these

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

The pattern of a crystalline solid is:

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One dimensional

Two dimensional

Three dimensional

Either A or B

None of these

As 1 ohm x 1 farad = 1 second For MΩ x PF =

Choose an answer

Second

ms

μ s

Ms

The mass distribution of a rigid body is

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Uniform

Not uniform

Both

None of these

The blood pressure of about 120 torr is called the

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Diastolic pressure

Systolic pressure

Minimum diastolic pressure

Dangerous blood pressure

Who attempted to measure the speed of light

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Gallileo

Michelson

Newton

None of these

Inertial mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

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

Choose an answer

Equal

Smaller

Greater

None of these

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

High temperature superconductors have temperature

Choose an answer

Above 77 K

Below 77 K

At 77 K

None of these

If a source of light is moving away from stationary observer then frequency of light wave appears to change because of

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Doppler's effect

Interference

Diffraction

None of the above

At the top of the trajectory of a projectile the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Antiparallel to each other

Negative and positive charge in a hollow sphere are equal in the number then flux from the surface will be

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Zero

Positive

Negative

Flux will be both negative and positive

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

The electrons, which can wander in the solid, are known as:

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Valence electron

Free electron

Loosely bound electrons

None of these

If we keep the moment arm, fixed while change the force, then, the torque is

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Changed

Does not change

Some what change

None of these

In the thin film, the path difference between the two reflecting waves depends upon

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thickness of film

nature of film

angle of incidence

all of them

The sky appears blue because

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Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color