Question # 1

The absence of light in the optical fibres represents the number

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0

1

2

-1

The temperature at which the vibrations become so great that structure of the crystal breaks up, is called:

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Critical temperature

Temperature of vaporization

Melting point

Both A and C

Both A and B

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

The direction of torque is

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The same as the direction of the corresponding applied force

Opposite to the direction of the applied force

Perpendicular to the direction of the applied force

Parallel to applied force

Two lenses of power +12 and -2 diopters are placed in contact the power of combination is

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10 diopters

8 diopters

6 diopters

12 diopters

Two equal, antiparallel and non-collinear forces are called

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Net force

Couple

Torque

None of these

Which of the following is an example of Brittle substances?

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Copper and Brass

Brass and glass

Copper and glass

Only glass

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 power loss can also take place due to

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Information received can be inaccurate due to dispersion

Light signal may not be perfectly monochromatic

Signal accuracy may be affected by deflective source

All of these

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

A water hose of internal diameter of 20 mm discharges 30 kg of water in 60 sec. Calculate speed of water

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1.2 ms^-1

1.6 ms^-1

1.8 ms^-1

2.1 ms^-1

On a diffraction grating which thing acts as a slit

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the lines which are ruled on it

the spacing between the lines

either of them

none of them

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

Blood vessels are not

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Flexible

Rigid

Some times flexible

None of these

The volt is equal to

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C/q

N/m²

Joule/coulomb

Nm²/C

In addition and subtraction

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Percentage uncertainties are added

Percentage uncertainties are subtracted

Absolute uncertainties are added

Absolute uncertainties are subtracted

SI Unit of power is

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Joule

Pound

Watt

Dyne

The uncertainty of any measurement may occur due to

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Limitation to an instrument

Natural vibrations of the object

Natural imperfections of a persons sense

All of these

The interference fringes are of

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equal width

variable width

zero width

non-uniform width

Adjacent layers in laminar flow are

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Min with each other

Smoothly slide one over the other

oppose each other

None

A closed organ pipe and an open organ pipe have their first overtone identical infrequency. Their lengths are in ratio

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3:4

1:2

2:3

3:5

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

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constant

increasing

decreasing

none of them

Types of physical quantities are

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one

Two

Three

None of these

When heat is added to the system, the entropy change is:

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Positive

Negative

Zero

None of these

The distance between the top adjacent slits on diffraction grating is called

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element

grating element

aperture

slit

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

A grating with high resolving power can distinguish ______ difference in ______

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Smaller, amplitude

Greater, wavelength

Smaller, wavelength

Greater, intensity

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

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6.66 j

15 j

22.5 j

45 j

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

The conductivity of super conductor at critical temperature becomes

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Zero

1

Infinite

Negative

In full wave rectification, the output DC voltage across the load is obtained for.

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The positive half cycle of input AC only

The negative half cycle of input AC

The completes cycle of input AC only

All of the above

The displacement coincides with the path of motion when a body moves along a

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Straight line

Curved path

Zig Zag path

None of these

The working of carburetor of a car uses

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Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

Which one of the following gas properties of gas molecules is the same at a particular temperature

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Momentum

Speed

Mass

Kinetic Energy

Which of the given strains can also be written as tan θ

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Compressional strain

Volumetric strain

Shear strain

All of these

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

When body is connected to earth then electrons from the earth flow into the body. It means that the body is

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Uncharged

An insulator

Positively charged

Negatively charged

The typical speed of human swimming is

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1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

The approximate efficiency of steam turbine is

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35 - 46%

40 - 43%

29 - 36%

30 - 47%

Work done by centripetal force is

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Maximum

Minimum

Zero

None

The diameter of an atom is

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10^-7 m

10^-10 m

10^-12 m

10^-14 m

The charged nucleus of an atom itself spins its magnetic field is

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Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

The nonrenewable energy source is

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Sunlight

Hydroelectric

Uranium

None of these

The binding energy per nucleon is:

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Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

A telescope is rotatable about the same vertical axis as the turntable, with a scale which is

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Main scale

Vernier scale

Half degree scale

None of these

When a body moves in a circular path,no work is done by the force since.

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Force and displacement are perpendicular to each other

The force is always aways from the centre

There is no displacement

There is no net force

Which of the following types of optical fibre has a very thin core of about 5μm diameter and has a relatively large cladding?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

If the path difference must be an integral multiple of wavelength

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sin θ = md/λ

d sin θ = mλ

d sin θ = m/λ

d sin θ = λ/m

The splitting of white light into several colors on passing through a glass prism is due to

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Refraction

Reflection

Interference

Diffraction

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

Viscosity of glycerin at 30^oC in Nsm^-2

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

Stoke s law is applicable to

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Very fast moving objects only

Only stationary objects

Slow moving objects

All

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

If a dielectric is placed between the plates of a capacitor its capacitance will

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Increase

Decrease

Becomes double

None of these

The velocity of flow of a liquid through an orifice at the bottom of a tank depends on the

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Density of the liquid

Area of the cross-section of the orifice

Height of the liquid above the office

Height of the orifice from the ground

It is easier to turn a steering wheel with both hands than with a single hand because

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Accelerating force increase on the wheel

Two forces act on the wheel

Two hands provide firm grip

Couple acts on the wheel

The atoms or molecules in a crystalline solid are held together by

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Attractive force

Gravitational force

Cohesive force

Electromagnetic force

The insulators have conductivities ties in the range

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10^-10 to 10^-20 (Ωm)^-1

10^-5 to 10^-20 (Ωm)^-1

10^-15 to 10^-25 (Ωm)^-1

None of these

The quality of the moving body is called

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Motion

Momentum

Force

None of these

When a body moves with increasing acceleration, its velocity-time graph is a

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straight line

horizontal straight line

vertical straight line

curve

A force of 10N acts on a body of mass 2 kg for 2 sec rate of change of momentum of body is

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5kg m/sec²

10kg m/sec²

15kg m/sec²

None

When the light from two lamps falls on a screen, no interference pattern can be obtained. Why is this?

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the light from the lamps is white

the lamps emit light of different amlitudes

the light from the lamps is not coherent

the lamps are not point sources

Light year is measured in

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Time

Length

Speed

None of these

A charge -4 μ C is at origin and +16 μ C is at a distance 3 m on positive x-axis the zero field is located at

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3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

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

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acceptor

donor

either of them

none of them

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

The young's modulus of a wire of length L and radius 'r' is Y. If the length is reduced to L/2 and radius to r/2, its Young's modulus will be

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Y/2

Y

2Y

4Y

The SI unit of stress is same as that of

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Momentum

Pressure

Force

Length

Which of these statements is not correct?

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Moment of inertia is independent of shape and size of the body

Moment of inertia depends on choice of axes

Moment of inertia does not depend on mass of body

None of these

A capacitor of 2μF is connected with a battery of 12 volts the charge stored is

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2.5 × 10^-5 C

2.4 × 10^-6 C

2.4 × 10^-5 C

2.4 × 10^-6 C

A 500 kg car takes a round turn of radius 0 m with a velocity of 36 km/h.The centripetal force is

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250 N

750 N

1000 N

1200 n

According to WH Bragg and WL Bragg monochromatic beam of X-rays was reflected form a crystal plane is like a

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Smooth and regular

Mirror

Thin film

None of these

Newton's first law of motion says a body will

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Remain at rest

Continuous move to with uniform velocity

Have no unbalanced external force act

All of these

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

Which of the quantity is dimensionless:

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Strain

Stress

Modulus of elasticity

Work

Entorpy

First law of thermodynamics tells us that heat energy can be converted into work which is

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Equivalent

Greater

Lower

None of these

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

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Decreases

Remains unchanged

Becomes infinite

Increases

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

Torque producing anticlockwise rotation is taken as

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negative

positive

zero

both negative and positive

A capacitor is charged with a battery and then it is disconnected A slab of dielectric is now inserted between the plates then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increases stored energy decreases and charge remains the same

Potential difference between the plates decreases,stored energy decreases and charge remains unchanged

None of the above

The direction of a ray of light is.......to the wave front.

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Parallel

Equal

Opposite

Perpendicular

The physical sciences deals with

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Living things

Non-living things

Both

None of these

The main reason for the high speed of bullet train is

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Magnetic effect

Reduced friction

Design of train

None of these

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

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

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random positions

do not oriented along external field and also do not returns to original random position

none of them

One electrostatic unit (esu) of charge is equivalent to

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3.3 x 10 coulomb

3.3 x 10^-9coulomb

3.3 x 10^-10coulomb

3.3 x 10^-11coulomb

The refractive index of a medium is defined as a ratio

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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

Sun has elliptical shape when it rises and sets due to

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Refraction

Reflection

Scattering

Dispersion

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

Rainbow is formed due to combination of

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Dispersion and total internal reflection

Reflection and refraction

Dispersion and focusing

Refection and scattering

A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

One radian is equal to

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360^o/π

58^o

57^o

57.3^o

The relative permitivity ∈_r for germanium is

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16

17

18

22

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

Which device converts the light signals which these amplified and decoded

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Photo cell

Photo diode

Photo transistor

None of these

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max Planck

Albert Einstein

As the Δt approaches to zero, the limit of ratio Δω/Δt becomes

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Average acceleration

Variable angular acceleration

Instantaneous angular acceleration instantaneous

None of these

The diodes works on

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A.C

D.C

both A and B

None of these

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

Which of the following cannot have an effect on the weight of an object?

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The distance of the object from a planet

The acceleration of the object

The placement of the object on a different planet

The mass of the object

The speed of flow of fluid in laminar flow is

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Low

High

Very high

Some time high some time low

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

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

At every degree Celsius rise of temperature, the volume of a given mass of a gas at constant pressure increases by

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1/273 of its value at 0°C

1/373 of its value at 0°C

1/173 of its value of 0°C

1/700 of its value at 0°C

Ratio of dimensions of power and K.E is

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1 : 1

T : 1

1 : T

M : T

Angle between ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

A light wave produced by oscillating charge consists of a periodic variation of

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electric field

magnetic field

either of them

both of them

The minimum number of lenses used in compound microscope is

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1

2

3

4

Torque is defined as:

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Time rate of change of angular momentum

Time rate of change of linear momentum

Time rat of change of angular veloctiy

All of these

The total flux through a closed surface does not depend on

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Geometry of closed surface

Medium

Charge used temperature

None of these

The original source of biomass energy is

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Moon

Sun

Geothermal

None of these

Angular acceleration is produced in a body by the physical quantity called

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momentum

vibration

torque

centrifugal force

A line whose tangent at each point is in the direction of an electric intensity at that point is called

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Charge

Voltage

Electric force

None of these

An electric force which hold the charges to make atoms and molecules

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Positive charges

Negative charges

Neutral charges

a & b

We can achieve polarization by

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Absorption

Reflection

Scttering

All of above

Coin of radius R is beaten uniform to make a disc of radius 2R.Its moment of inertia.

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Decreases

Increases

Remains the same

Decreases or increases depending on the actual value

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

In n-type substances the minority carriers are

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Holes

Electrons

Neutrons

None

If the light travels in a straight line, the central region should appear

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Bright

Dark

No effect

None of these

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

Two masses of 1 g and 4 g are moving with equal kinetic energies.The ratio of the magnitudes of their linear momenta is:

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4 : 1

√2 : 1

1 : 2

1 : 16

An ECG records the electric process in heart between

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Points on human skin

Two limbs of human foot

Two lungs of human

None of these

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

zero

Motion of rocket is based upon

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Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

Which type of optical fiber has the largest diameter

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Single mode step index fiber

Multi-mode step index fiber

Multi-mode graded index fiber

None of these

Nm^-2is approximately called:

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Telsa

Weber

Pascal

Watt

Guass

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them

Young's modulus for lead is

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10

11

15

19

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

At the top of the trajectory of a projectile,the acceleration is

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The maximum

The minimum

Zero

g

The conduction of electrons takes place and conduct electric current through solids is a

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Energy band

Conduction band

Valence band

Completely filled band

A non-inverting amplifier has infinite input resistance then the voltage gain of noninverting amplifier will be:

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Zero

Infinite

One

100

The product of force and time of impact force is called

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Momentum

Impulsive force

Impulse

Rate of change of momentum

If the earth suddenly shrinks to half of its present radius the acceleration due to gravity will be

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g/2

4g

g/4

2g

How many types of charges are ?

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One type

Two types

Three types

None of these

While applying Guass's Law assuming that the field is

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In different directions

Constant in direction

In all directions

None of these

Newtons first law of motion is also known as

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Law of motion

Law of mechanics

Law of inertia

None of these

When a shell explodes in mid-air, its fragments fly off in

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One direction

Opposite direction

Different direction

None of these

Study of fluid properties in motion is

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Dynamics

Fluid statics

Fluid dynamics

None

When m₂>> m₁and V_{2 = 0 then result of their velocities}

Choose an answer

V₂= 0 and V₁= V'₁

V'₁= -V₁and V'₂= 0

V₁= V₁and V₂= 0

None of these

Unit of solid angle is

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Radian

Degree

Steradian

Revolution

Which quantity has the same units as impulse?

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force

work

linear momentum

acceleration

The S.I. unit of permitivity are

Choose an answer

Nmc^-2

C² N^-1 m^-2

Nm² C^-2

NmC^-1

The property of bending of light around obstacies is called

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interference

reflection

diffraction

polarization

Demension of torque is

Choose an answer

MLT^-2

ML²T^-1

ML²T^-2

ML²T²

When one mirror of Michelson interferometer is moved a distance of 0.5 mm. 2000 fringes are observed, the wavelength of light used is

Choose an answer

5000 nm

5000 A°

500 cm

2000 A°

The ballistic missiles are useful for

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Short ranges

Long ranges

Medium ranges

None of these

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

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

The magnitude of potential barrier for Ge is

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0.7 v

0.3 V

7v

3 v

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

Choose an answer

A tangent

A tangent envelope

Curved surface

None of these

The crystalline structure of NaCl is

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rectangular

hexagonal

tetrahedral

cubical

Pressure may be defined as_____per second per unit area:

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Change in force

Change in momentum

Change in energy

Work done

If speed of electron is 5 x 10⁵ m/s.How long does it take one electron to traverse 1 m?

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1 x 10⁶ s

2 x 10⁶ s

2 x 10⁵ s

1 x 10⁵ s

Bulk modulus for tungsten is

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50

100

150

200

Which one the following gives three regions of electromagnetic sepctrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, Infrared rays, micro waves

Visible light, gamma rays, radio waves

The bands below the valence band are

Choose an answer

completely filled and play active part in conduction process

completely filled and plays no part in conduction process

not completely filled and play active part in conduction process

not completely filled and play no part in conduction process

Bernoulli's equation related to pressure, fluid speed and height which is

Choose an answer

An important equation

Principal equation

Fundamental equation

None of these

1^st superconductor was discovered in year

Choose an answer

1890

1930

1895

1911

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

If the water falls from a dam into a turbine wheel 19.6 m below,then the velocity of water at the turbine is

(Take g = 9.8 m/s²)

Choose an answer

9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

When two semiconductors of p- and n-type are brought into contact, they from a p-n junction which act like a:

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Conductor

Amplifier

Oscillator

Rectifier

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

Bouncing off the squash ball several times from wall bears

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Total displacement

Average displacement

No displacement

None of these

On heating, it becomes a very viscous liquid at almost

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500 C^o

800 C^o

900 C^o

1000 C^o

Fluids resist force this property is called

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Stiffness

Strength

Ductility

Elasticity

In the thin film, the path difference of two reflected ray depends upon

Choose an answer

Thickness of the film

Nature of the film

Angle of incidence

All of these

A person is sitting in a traveling train and facing the engine.He tosses up a coin and the coin falls behind him.It can be concluded that the train is

Choose an answer

Moving forward and gaining speed

Moving forward forward and losing speed

Moving forward with uniform

Moving backward with uniform speed

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

Energy can be obtained form solid waste by

Choose an answer

Direct combustion

Indirect combustion

Permentation

None of these

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

Soap bubble looks colored due to

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Dispersion

Reflection

Interference

Any one of these

Fluid friction of a spherical body depend on the

Choose an answer

Shape

Size

Orientation

All of these

The dimensional formula for latent heat is:

Choose an answer

M^°L²T¹

ML²T^-2

MLT^-2

ML²T^-1

Diamagnetic substances are those in which

Choose an answer

Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

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

Choose an answer

Doppler's effect

Interference

Diffraction

None of the above

An instrument called a sphygmomanometer measure

Choose an answer

Density of water

Blood pressure

Milk density

None of these

Some charge is being given to a conductor.Then its potential

Choose an answer

Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

The two forces of a couple do not follow the rule that

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They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

High temperature superconductors have temperature

Choose an answer

Above 77 K

Below 77 K

At 77 K

None of these

The quantity of motion of the body is called

Choose an answer

Force

Acceleration

Momentum

None of these

The energy of molecular motion appears in the form of

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Friction

Heat

Viscosity

Potential energy

When we jump out of a boat standing in water moves

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Forward

Backward

Sideways

None of these

The original source of Wind energy is

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Tides

Waves

Sun

Moon

To observe interference of light the condition which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

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

Ultra-violet rays differ from X-rays in that ultra - violet rays

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Cannot be diffracted

Cannot be polarized

Do not affect a photographic plate

Have a lower frequency

The direction of the angular velocity vector is along

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The tangent to the circular path

The inward radius

The outward radius

The axis of rotation

At what point/points in its path does a projectile have its maximum speed

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At the point of projection

At the point where its strikes the ground

Both

None of these

When we consider the average velocity of a body, then the body is moving in

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straight line

curved line

may be in a straight or curved path

none of them

Vectors are those physical quantities which requires

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Magnitude

Magnitude and directions

Direction

None of these

Rotational kinetic energy of a disc is

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K.E. _rot = 1/2 mV²

K.E. _rot = 1/3 mV²

K.E._rot = 1/4 mV²

None of these

To get high resolving power for a telescope one should use

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Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

Electromagnetic waves transport:

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Energy only

Momentum

Both A and B are correct

None is correct

Light year is a unit of

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Distance

Speed

Acceleration

intensity