Question # 1

Bernoulli s equation relates pressure to fluid

Choose an answer

Speed and density

Speed and viscosity

Speed and height

Height and viscosity

Fight of rocket in the space is an example of

Choose an answer

Newton's first law

Newton's third law

Newton's second law

all of them

A charge Q is divided into two parts q and Q - q and separated by a distance R.The force of repulsion between them will be maximum when:

Choose an answer

q = Q/4

q = Q/2

q = Q

None of these

The maximum stress that a body can tolerate is called

Choose an answer

UTS

Permanent stress

Elastic strength

Plastic stress

For incident angles equal or greater than the critical angle the glass air boundary will act as a

Choose an answer

Convex mirror

Concave mirror

Mirror

None if them

An electric field can deflect

Choose an answer

Neutrons

X-Rays

γ-Rays

α-Rays

The period of a satellite when there is critical velocity is

Choose an answer

80 min approx

84 min approx

82 min approx

90 mix approx

As the object is brought from a far off point to he focus, the magnification goes on

Choose an answer

Increasing

Decreasing

Do not change

None of these

Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is

Choose an answer

25 cm

5 cm

2.5 cm

5 mm

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

Choose an answer

upward direction

rightward direction

clockwise direction

anticlockwise direction

The deflection by Einstein is as great as newtons is

Choose an answer

Twice

Thrice

Four times

Half time

Multiplication of a vector is carried out by a

Choose an answer

Number

Direction

Number and direction

None of these

The transmitter in optical fiber system contains a device called

Choose an answer

LED

Diode

Transistor

None of these

The length breadth and thickness of a block are given by 1= 12 cm b= 6 cm and t= 2.45 cm.the volume of the block according to the idea of significant figures should be:

Choose an answer

1 x10² cm³

2 x 10² cm³

1.763 x 10² cm³

None of these

Interference and diffraction confirm:

Choose an answer

Particle nature

Wave nature

Dual nature

None of these

If the direction of the applied force is reversed then

Choose an answer

Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

In slow Compression of a gas in a cylinder is reversible as the compression can be changed to expansion by

Choose an answer

Rapid decreasing the pressure

Slowly decreasing the pressure

Extremely decreasing the pressure

None of these

Assuming the earth to be a sphere of radius 6400 km. What is the value of acceleration due to gravity at a height of 800 km above the surface of the earth ?

Choose an answer

5.35 ms^-1

6.35 ms^-2

7.35 ms^-2

8.35 ms^-2

From the following pairs,choose the pair that does not have identical dimensions

Choose an answer

Angular momentum and Planck's constant

Moment of inertia and Moment of force

Work and Torque

Impulse and Momentum

Which property of waves proves that light is a transverse wave?

Choose an answer

diffraction

interference

polarization

reflection

Super conductors are the those materials whose resistivity becomes zero below certain temperature called

Choose an answer

Curie temperature

Fixed temperature

Critical temperature

None of these

The horizontal velocity component in projectile motion is

Choose an answer

Zero

Constant

Maximum

None of these

A passenger lift accelerates upwards. What change would a passenger inside the lift standing on a weighing machine notice in the weight shown on the machine?

Choose an answer

a decrease in the reading on the scale

no change in the reading on the scale

an increase in the reading on the scale

an increasing in the weight

Compton Effect makes the use of the law of conservation of:

Choose an answer

Energy

Momentum

Charge

Both (a) & (b)

Newton's rings are formed due to

Choose an answer

Refraction of light

Diffraction of light

Interference of light

None of these

The direction of torque can be determined by

Choose an answer

Head to tail rule

Right hand rule

Left hand rule

None of these

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

Choose an answer

Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

At terminal velocity the net force acting on it is

Choose an answer

Maximum

Minimum

Zero

None of these

The speed of swimming of porpoise is

Choose an answer

5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

In case of uniform circular motion which of the following physical quantity do not remain constant?

Choose an answer

Speed

Momentum

Kinetic energy

Mass

The distance between the objective and eye-piece of a telescope in normal adjustment is

Choose an answer

f/₀-f_e

f₀+f_e

2f_e-f_e

None of these

Which of the following phenomenon is not application of Bernoulli s equation

Choose an answer

Swing in cricket ball

Flying of airplane

Working of carbonator

Beats

We can observe only when the grating spacing is

Choose an answer

of the order of the wavelength used

greater than the wavelength used

less than the wavelength used

any one of them

Doping is the process in which the small amount of impurity is added into pure semiconductor lattice in the ratio

Choose an answer

1 to 10³

1 to 10⁴

1 to 10⁵

1 to 10⁶

The approximate efficiency of Nuclear power plant is

Choose an answer

20 - 30%

30 - 35%

33 - 40%

37 - 42%

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

Choose an answer

44%

55%

66%

77%

A fiber of 50μm diameter capable of carrying white light at ______ distances is called ______ index fiber

Choose an answer

Large, multi-mode step

Small, multi-mode step

Small, multi-mode graded

Large, single mode step

The direct conversion of sunlight into electricity through the use of semi conductor devices called

Choose an answer

Photo cell

Photo voltaic cell

Semiconductor diode

None of these

When the length of a microscope tube increases its magnifying power

Choose an answer

Decreases

Increases

Does not change

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

Which theory of gravitation is better

Choose an answer

Einsteins

Newtons

Lapalces

None of these

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

Choose an answer

Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

The forces which forms a couple

Choose an answer

Can be replaced by a single equivalent force

cannot be replaced by a single equivalent force

Are perpendicular to each other

All of these

Which of the following is not true for a crystalline substance

Choose an answer

Shorter range order

Isotropic electrical conductivity

Flat surface

Sharp melting point

In integers such as 8,000 Kg, significant zeros are determined by the instrument when least count is 1 Kg

Choose an answer

8.00 × 10³ Kg

8.000 × 10³ Kg

8.00 × 10³ Kg

8.0 × 10³ Kg

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

Choose an answer

increases

decreases

remains unchanged

increases rapidly

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

Choose an answer

Two times

Three times

Four times

Six times

How many major components of fibre optic communication system are

Choose an answer

4

5

3

2

The temperature at which the gasses if they remain in gaseous state exert zero pressure and have zero volume is called

Choose an answer

1°C

1°F

1 K

Absolute Zero

Physics is an important and basic part of physical sciences which is a

Choose an answer

Mathematical science

Experimental science

Statistical science

None of these

Which of the given pair have same dimension

Choose an answer

Stress, pressure

Elastic modules, pressure

Stress, elastic modules

All have same dimension

The body is in a state equilibrium when it is

Choose an answer

At rest

In motion

In rotation

None of these

A polaroid is:

Choose an answer

An adjustable shutter

A device used to analyze polarized light

A device used in polarimeter

A light filter

A material having high refractive index has

Choose an answer

Low density

High density

Zero density

None of these

Which of them is not a physical quantity

Choose an answer

Density

Impulse

Energy

Kilogram

Dolphins have bodies to assist their movement in water are

Choose an answer

Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

Arsenic, antimony and phosphorous are the elements from

Choose an answer

third group

fourth group

fifth group

none of them

According to the Huygen's principle, the secondary wavelets propagate in the forward direction with a speed equal to

Choose an answer

speed of wave motion

speed of medium

speed of electrons

speed of protons

The force which aries when one layers of liquid slides over another layer is measure by

Choose an answer

Viscosity

Velocity

Momentum

Acceleration

Tick which of the following is not state variable:

Choose an answer

Heat energy

Pressure

Entropy

Volume

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1 to zero on striking the ball, then force is

Choose an answer

5.3 N

15 N

17.3 N

19.2 N

The motion of molecules in gases i:

Choose an answer

Orderly

Random

Circular

All of these

As cross-sectional area of the pipe decreases the speed of fluids must increase according to

Choose an answer

Bernoulli's equation

Venture's reaction

Equation of continuity

Torricelli's theorem

The momentum of particle is numerically equal to its kinetic energy.What will be the velocity of the particle?

Choose an answer

4 m/s

1 m/s

2 m/s

None of these

In Milikan's oil drop experiment, the drag force on oil drop is

Choose an answer

F_D = 6ηrv_t

F_D = 6πηrv_t²

FD = 6πηr²v_t

FD = 6πηrv_t

A constant volume gas thermometer is more sensitive than liquid thermometer because

Choose an answer

Gas expand more than liquid

Gases are easily obtained

Gases are much lighter

Gases do not easily change their state

The spacing between lines of diffraction grating is

Choose an answer

Opaque

Transparent

Semi-transparent

None of these

A constant volume gas thermometer works on

Choose an answer

Charles' law

Boyle's law

Pascal's law

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:

Choose an answer

60 kg wt

72 kg wt

48 kg wt

Zero

The bending of light when it passes from one medium to another is known as

Choose an answer

Refraction

Interference

Polarization

Diffraction

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

Choose an answer

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 dimensional formula of light year is

Choose an answer

LT^-1

T

ML²T^-2

L

The height at which the satellite stay directly above a particular point on the surface of the earth above the equator is

Choose an answer

24000 km

36000 km

42000 km

None of these

S.I. unit of angular velocity of

Choose an answer

Radian per second

Revolution per minute

Degree per second

None of these

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:

Choose an answer

1: 1

1: 8

8: 1

1: 2

Velocity is a

Choose an answer

Scalar quantity

vector quantity

constant quantity

none of them

If we move from equator to pole,value of g

Choose an answer

Increases

Decreases

Remains same

First (A) and then (B)

Such type of fibre in which center core is of high refractive index and the layer over the central core is low refractive index is called

Choose an answer

Step index fibre

Multi mode step index fibres

Multimode graded index fibre

None of these

One erg is equal to

Choose an answer

10⁵j

10^{7 j}

10^-3 j

10^-7j

Trajectory of projectile is

Choose an answer

Ellipse

Hyperbola

Parabola

None of these

A semi conductor in its extremely pure from is known as

Choose an answer

extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

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

Choose an answer

selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

The size of the domains in such that they can contain

Choose an answer

10²to 10⁴atoms

10⁴to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

A line normal to the wave front is called

Choose an answer

A beam of light

A ray of light

Both

None of these

Blood vessels under normal conditions are inflate

Choose an answer

Occasionally

Some times

All the times

None of these

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

Choose an answer

lattice point

crystal lattice

cubic crystal

unit cell

The force between two chares 0.06 m apart is 5N.If each charge is moved towards the other by 0.01 m,then the force between them will become

Choose an answer

7.20 N

11.25 N

22.50 N

45.00

The SI unit of torque is

Choose an answer

Nm^-1

Nm^-2

Ncm

Nm

Selenium is an insulating material when exposed to

Choose an answer

Light

Dark

Monochromatic light

None of these

In thin film colours are due to

Choose an answer

Reflection

Interference

Diffraction

Refraction

For geosynchronous satellite the orbital time period is

Choose an answer

Greater than earth s spinning time period

Less than earth s spinning time period

Equal to the earth s spinning time period

None of the earth

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

Choose an answer

500 ms^-1

1000 ms^-1

250 ms^-1

zero

When the temperature of source and sink of heat engine become equal than efficiency of heat engine will

Choose an answer

Maximum

Minimum

Negative

Zero

The base of equation of continuity is on the

Choose an answer

First law of motion

Law of conservation of mass

Law of conservation of charge

Law of conservation of momentum

A particle moves along a circular path under the action of a force.The work done by the force is

Choose an answer

Zero

Positive and non zero

Negative and non zero

None of above

Biomass is a potential source of renewable energy. This includes all the organic material such as

Choose an answer

Crop residue

Natural vegetation

Animal dung

All of these

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

Choose an answer

Far point

Near point

Distant point None of these

Young's modulus for diamond is

Choose an answer

700

913

1100

1120

The rotational analogue of force in linear motion is given by

Choose an answer

Torque

Linear momentum

Moment of inertia

Angular momentum

The velocity of a body at some particular instant is called

Choose an answer

Initial velocity

Instantaneous velocity

Variable velocity

None of these

Which of the following has no dimension

Choose an answer

Stress

Strain

Elastic modulus

Both strain and elastic modulus

The unit of focal power of a lens is

Choose an answer

Watt

Horse power

Dioptre

Kilo watt

A space ship has the radius of 9.8m. To produce an artificial gravity of 9.8m/sec² the spinning speed is

Choose an answer

9.8 m/sec

1 m/sec

19.6 m/sec

None of these

Einstein inferred that is gravitational acceleration and inertial acceleration are equivalent, gravity must

Choose an answer

Reflect light

Bend light

Turn light

None of these

Two forces are acting together on an object.The magnitude of their resultant is minimum when the angle between the force is:

Choose an answer

0°

60°

120°

180°

When interference of light takes place

Choose an answer

Energy is created in the region of maximum intensity

Energy is destroyed in region of maximum intensity

Conservation of energy hold goods and energy is redistributed

Conservation of energy does not hold good

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:

Choose an answer

50 sec

100 sec

150 sec

250 sec

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1to zero on striking the ball, then force is

Choose an answer

5.3 N

15 N

17.3 N

19.2 N

In between two consecutive permissible energy band there is a range of energy states which cannot be occupied by electrons. These are called

Choose an answer

Energy band

Energy states

Forbidden energy gap

None of these

In deriving Bernoulli s equation we assume that the fluid is

Choose an answer

Incompressible

Non-viscous

In steady flow

All of these

Velocity time graph can also be used to determine

Choose an answer

Distance

Velocity

Acceleration

None of these

In the theory of dimensional analysis, heat may be properly represented by:

Choose an answer

ML²T^-2

MT^-2

ML^-1T^-1

None of these

The amorphous material (solids) have

Choose an answer

No structure

No melting point

No definite shape

All of them

Distance covered by a freely falling body in 2s will be

Choose an answer

4.9 m

19.6 m

29.2 m

44.1 m

The area of the loop is the dissipated energy which do work against friction of domains is called

Choose an answer

Current loss

Voltage loss

Hysteresis loss

None of these

The ratio of tensile stress to tensile strain is

Choose an answer

Force

Young's modulus

Bulk modulus

Shear modulus

A uniform beam of weight 100 N is 4 m long and is supported 1.0 m from one end. A load of weight wN hangs from that ened and the beam is in equilibrium.What is the value of w?

Choose an answer

50 N

75 N

100 N

200 N

George Stoke found the effect of viscous drag on small sphere falling through liquids in

Choose an answer

1782

1851

1902

1947

Electromagnetic waves transport:

Choose an answer

Energy only

Momentum

Both A and B are correct

None is correct

Conditions for interference are that the two sources should be coherent and:

Choose an answer

At the far off distance

Close together

Coinciding

None of these

Salters duck is consists of

Choose an answer

Duck float

Body float

Balance float

a and c

The Bernoulli's equation often expressed in

Choose an answer

P + ρV² + ρgh = constant

P + 1/2 ρV + ρgh = constant

P + 1/2 ρV² + ρgh = Constant

P + 1/2 ρV² + gh = constant

The approximate efficiency of Nuclear reactor

Choose an answer

33%

32%

39%

45%

An optical instrument used to see very far off objects is called

Choose an answer

Telescope

Camera lens

Microscope

Spectrometer

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

Choose an answer

Zero

90^o

180^o

None of these

In compound microscope image formed is

Choose an answer

Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

The speed of flying bee is

Choose an answer

1 ms^-1

5 ms^-1

8 ms^-1

10 ms^-1

Why is the weight of an object approximately the same at all points on the earth?

Choose an answer

the gravitational field is uniform

equal force is exerted on the object at points equidistant from the centre

weight is unaltered by attitude

weight of an object varies with its distance from earth

Slope of displacement time graph gives

Choose an answer

Instantaneous velocity

Instantaneous acceleration

Work done

Force

In proportional limit (σ) of material, the stress increases with strain

Choose an answer

Linearly

Constant

Abruptly increases

None of these

Bats navigate and find food by:

Choose an answer

Ultrasonic

Echolocation

Refraction

In normal adjustment, the length of the telescope is

Choose an answer

f_e + f_o

f_o - f_e

f_e - f_o

None of these

A single step index fibre can carry more than

Choose an answer

14 TV channels

14,000 phone calls

16 TV channels

a and b

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

Choose an answer

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

Which of the following quantity is dimensionless?

Choose an answer

Gravitational constant

Plank's constant

Power of lens and gas constant

None of these

Examples of crystalline solids are:

Choose an answer

Copper

Zirconia

NaCI

All of these

Both A and B

Internal friction of a fluid is called

Choose an answer

Surface tension

Resistance

Viscosity

None of these

The speed of light in vacuum is 3 x 10⁸ ms^-1.Its speed in a medium of refractive index 1.5 will be

Choose an answer

6.5 x 10⁸

2 x 10⁸ ms^-1

4.5 x 10⁸ cm

5.5 x 10⁸

In Multimode step index fibre the refractive index from its centre to the boundary is

Choose an answer

1

1.55

1.52

1.43

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

Choose an answer

5kg m/sec²

10kg m/sec²

15kg m/sec²

None

Insulators are those materials which valence electrons are bound

Choose an answer

Loosely

Tightly

Very tightly

None of these

The function of compensator plate in interferometer is to

Choose an answer

Interfere properly

To equalize the distance of M₁ and M₂

Reflecting light properly

None of these

Michelesion's interferometer is an instrument usually used to measure

Choose an answer

intensity of light

speed of light

wavelength of light

dispersion of light

The process of doping causes resistivity of semiconductor to

Choose an answer

Increase

Decrease

Same

Become zero

Bulk modulus is involved when the deformation is:

Choose an answer

One dimentional

Two dimentional

Three dimentional

Any of these

None of these

A particle is moving with a constant speed along a straight line path A force is not required to

Choose an answer

Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

The original source of biomass energy is

Choose an answer

Moon

Sun

Geothermal

None of these

A radioactive isotope 𝟐𝟑𝟖 𝑼 decays consecutively to 𝟐𝟑𝟒 𝑼 the particles emitted are:

Choose an answer

One 𝛼 and one 𝛽

Two 𝛼 and one 𝛽

e 𝛼 and two 𝛽

Two 𝛼 and two 𝛽

Whenever high magnification is desired

Choose an answer

A telescope is used

A compound microscope is used

A microscope is used

None of these

Which one is not correct representation?

Choose an answer

5N

3 Newton

5 Newton

both a and b

If C_vdonotes molar specific heat at constant volume and𝜟 T is the change in temperature, then C_v𝜟T gives:

Choose an answer

Volume

Pressure

Energy

Entropy

The valency of electron in the valence band is known as

Choose an answer

Atom

Molecule

Hole

None of these

If the error in the measurement of radius of a sphere is 1% then the error in the measurement of volume will be

Choose an answer

1.1%

3%

5%

8%

The rate of decay radioactive substance:

Choose an answer

Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

If radius of droplet is halved then is terminal velocity in viscous medium

Choose an answer

Doubles

Is halved

Becomes one fourth

Becomes four time

1 joule is equal to electrons volt

Choose an answer

1.6 x 10^-19

1.6 x 10¹⁹

6.25 x 10¹⁹

6.25 x 10¹⁸

Waves in ocean are produced due to

Choose an answer

Tidal movement

Winds

Both A and B

Sunlight

The each atom of pure Ge or Si shares neighboring electrons are

Choose an answer

Three

Four

Five

None of these

How are X-rays diffracted by crystals in X-rays crystallography?

Choose an answer

they bounce off the nucleus

they are diffracted whey they pass from between them acting as a slit

they are diffracted by the electron clouds in the atoms

they hit the side the nucleus and change direction and thus are diffracted

Every crystalline solid has a melting point

Choose an answer

Definite

Not definite

Any

Change every time

As the Earth spins on its axis, the satellite on the equator always the remains the

Choose an answer

Opposite point

Different points

Same point

None of these

Fringe spacing in YDS experiment will be maximum if we use:

Choose an answer

Red light

Green light

Violet light

Blue light

Ordinary light has components of vibrations in all possible planes. Such light is

Choose an answer

Unpolarized light

Polarized light

Both

None of these

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

Choose an answer

r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

Find the angle between two forces of equal magnitude of their resultant is also equal to the magnitude of either of these forces

Choose an answer

60^o

120^o

180^o

360^o

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

Choose an answer

Greater acceleration

Small acceleration

Same acceleration

None of these

Torque is defined as:

Choose an answer

Time rate of change of angular momentum

Time rate of change of linear momentum

Time rat of change of angular veloctiy

All of these

If a force of 20 N makes an angle of 60° with the y-axis,then its vertical component will be

Choose an answer

5 N

17.32 N

10 N

8.66 N

Every crystalline solid has

Choose an answer

definite melting point

different melting points

may or may not be definite

none of them

The number of seconds in one year are

Choose an answer

3.154 x 10⁶

3.154 x 10⁵

3.154 x 10⁴

3.154 x 10⁷

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

Choose an answer

Inter planar spacing

Wavelength

Incident angle

All of these

A person standing near the track of a fast moving train has tendency to fall towards it because of

Choose an answer

Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

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

Choose an answer

The same parts

The different parts

Mixed rays

None of these

In thermodynamics, the internal energy is a function of

Choose an answer

Time

State

Temperature

None of these

The number 1678.9 should be written in scientific notation as

Choose an answer

16.789 × 10³

1.6789 × 10³

1678.9 × 10³

None of these

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by

Choose an answer

V_f = 0

Simple 'a'

a by g

None of these

Gravitation is the property of matter which is

Choose an answer

External

Internal

Intrinsic

None of these

The pressure exerted on the walls on the vessel by gas molecules is defined as:

Choose an answer

Force per unit volume

Energy per unit area

mass per unit volume

None of these

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

Choose an answer

1.18 x 10²JK^-1

1.20 x 10⁴J Kg^-1

1.23 x 10³JK^-1

1.23 x 10⁴J Kg^-1

Michelson interferometer is based upon

Choose an answer

Interference

Diffraction

Polarization

Reflection

If C and R denote capacity and resistance,the dimensional formula of CR is

Choose an answer

M°L°T^-1

M°L°T°

Not expressible in terms of MLT

The temperature of igneous rocks is about

Choose an answer

100 ^oC

200 ^oC

250 ^oC

270 ^oC

A convex ens acts as diverging lens when the object is placed

Choose an answer

Between F and 2F

At 2F

Within the focal length

Beyond 2F

cream gets separated out of milk when it is churned it is due to

Choose an answer

Gravitational force

Centripetal force

Centrifugal force

Resistance

How many electrons are in one Coulomb ?

Choose an answer

6.2 × 10^-23

6.2 × 10^-21

1.6 × 10^-19

Zero

The distance from Earth to Sun is

Choose an answer

10⁹ m

10⁸ m

10¹⁰ m

10¹¹ m

Two bullets are fired simultaneously,horizontally and with different speeds from the same place.Which bullet will hit the ground first?

Choose an answer

The faster one

Depends on their mass

The slower one

Both will reach simultaneously

One Pascal in SI is equal to

Choose an answer

One newton metre

One newton metre^-1

One newton metre^-2

One dyne cm²

An airplane flies 400 m from north and then files 300 m south and then flies 1200 m upwards then net displacement is

Choose an answer

1200 m

1300 m

1400 m

1500 m

A positive charge is moved from a low potential point (A) to a high potential point (B) Then the electric potential energy

Choose an answer

Increases

Decreases

Will remain the same

Nothing definite can be predicted

Maximum height of a bullet when fired at 30° with horizontal is 11 m.Then height when it is fired at 60° is

Choose an answer

22 m

6 m

33 m

7.8 m

The expression F x t is called impulse if the time 't' is

Choose an answer

zero

very large

very small

infinite

An electron and a proton are projected at right angles to a uniform magnetic field with

Choose an answer

the electron trajectory will be less curved than proton’s trajectory

the electron trajectory will be more curved than proton’s trajectory

) both trajectories will be equally curved

) both particles continue to move along a straight lins

An average energy used to make a car is

Choose an answer

4 × 10⁷ J

9 × 10⁹ J

7 × 10⁸ J

8 × 10⁹ J

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

Choose an answer

remain the same

decrease

increase

all of them

With a step-index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

Choose an answer

43 s per km

33 s per km

1 ns per km

33 ns per km

If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre,then the potential at a point distance 15 cm from the centre will be

Choose an answer

1/3 V

2/3 V

3/2 V

3 V

The expression for the terminal velocity V_t when mass of the droplet is considered is

Choose an answer

V^t = 2grρ/9η

Vt = 4grρ/9η

V_t = 4gr²ρ/9η

V_t = 4gr³ρ/9η

Mathematically, the instantaneous acceleration is represented by

Choose an answer

In the hysteresis loop, when the current is reduced to zero, the material

Choose an answer

does not retain magnetism

retains not retain magnetism

retains strong magnetism

none of them

Michelsion devised the Michelson's interferometer in

Choose an answer

1981

1891

1851

1881

Precision or absolute uncertainty and the least count have the relation in which absolute

Choose an answer

uncertainties is double the least count

Equal the least count

Half the least count

None of these