Question # 1

The smallest portion of a crystal lattice that if repeated in three-dimensions will generate the entire lattice is called:

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Unit cell

Lattice plane

Crystal

None of these

A body is in complete equilibrium when

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ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

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

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

Which of the following is not dimension less

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Poission ration

Sharing strain

Longitudinal strain

Volume stress

The force of friction that comes into action after the motion has started is called

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Limiting friction

Static friction

Friction

None of these

The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

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T₂ = 2T₁

T₂ = 4T₁

T₂ = T₁

none of these

The optical fibre is covered for protection with

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rubber jacket

plastic jacket

steel jacket

copper jacket

The dimensional formula for latent heat is:

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M^°L²T¹

ML²T^-2

MLT^-2

ML²T^-1

Graphs which are used to illustrate the variation of velocity of an object with time are called

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distance-time graphs

speed-time graphs

velocity-time graphs

acceleration-time graphs

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

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Is maximum at surface

Is maximum at centre

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

The variation if focal length of a lens when we pass from the central portion out words (to words the lens edges) is known as

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Astigmatism

Chromatic

Spherical aberration

Coma

The unit vectors is not restricted to Cartesian coordinate system only. Unit vectors may have

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Specific direction

Any direction

Not a and b

None of these

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser,As a result its capacitance

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Increase k time

Decrease k times

Decreases 1/k times

Remains unchanged

The heart of machine is

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Lamp and camera unit

Aluminium drum

Charging unit

All of them

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

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16 35.5

35.5 16

(35.2)²16

1 1

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

To find wavelength of light by his experiment. Newton utilized:

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Principle of phase change

Snell's Law

Bragg's law

Both (A) and (C)

A paratrooper is an example of

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Static equilibrium

Dynamic Equilibrium

Both static and dynamic equilibrium

None of these

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

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

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Crop residue

Natural vegetation

Animal dung

All of these

The curie temperature for iron is

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750°C

570°C

750°k

57°K

The fringe spacing varies directly with

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Distance L

Light of wavelength λ

Phase coherence

All of these

If the acceleration due to gravity is 10 ms^-2 and the units of length and time are changed to kilometer and hour respectively,the numerical value of acceleration is

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360000

72000

36000

129600

KWm^-2is the unit of

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Power

Energy

Intensity

Energy per unit area

A cube of metal is given a positive charge Q.For the above system,which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric field varies within the cube

A listener observes the frequency “f” of stationary source. If it move toward with 3 times of velocity of sound. Then the apparent frequency of the sound will be

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f

3f

f/2

4f

For a monochromatic light passing from air to glass, which one of the following statement is true?

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Frequency and wavelength decreases

Frequency increases and wavelength decreases

Frequency stays same, wavelength increases

Frequency stays the same, wavelength decreases

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

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Straight line

Horizontal straight line

Curve

None of these

To produce same acceleration in the bodies of masses 10 kg and 20 kg the force applied in the second body should be

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Halved

Equal for both bodies

Doubled

Three times

One horse power in terms of watt is

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7.46

74.6

0.746

746

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)

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

For obtaining equal and same height mirror should be

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Convex

Concave

Plane

None

Stress beyond which a permanent deformation is observed in a body is called

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Minimum stress

Maximum

Yield stress

Plastic stress

The percentage uncertainty in measuring the volume of sphere measured by calipers callipers is when r = 2.25 ± 0.01 cm with least count ± 0.01 cm

Choose an answer

46.7 ± 0.5 cm²

47.7 ± 0.5 cm³

47.7 ± 0.6 cm³

477.6 ± 0.6 cm³

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variables velocity

uniform velocity

Which type of the following force cannot do work, acting on a body

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Electric force

Gravitational force

Frictional force

Centripetal force

The critical temperature Tc for Aluminium is

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2.1 K

1.1 K

1.18 K

1.19 K

If water rises 4 cm in a long thin tube because of capillary action then under corresponding conditions of use.the rise (in the tube) of a liquid whose density is 2 g/cm³ will be

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1 cm

2 cm

8 cm

None

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max. Planck

Albert Einstein

The product of force times the perpendicular distance between some point and the line of action of the force is

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The moment of inertia action on it

The moment of force about the chosen point

The angular momentum of the body

None of these

Position vector is a vector, which describes the

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Location of a point with respect to origin

Location of point with respect to any point

Location of a point with respect to some related point

None of these

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Equation of continuity

Bernoulli's theorem

Toricelli's theorem

None of these

What is the average translational kinetic energy of the molecules in a gas at temperature 27 CC°

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5.62 x 10^-21J

5.96 x 10^-27J

6.21 x 10^-21J

6.29 x 10^-27J

The total flux through a closed surface does not depend on

Choose an answer

Geometry of closed surface

Medium

Charge used temperature

None of these

Approximate power of colour T.V. in watt is

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90

100

130

120

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

The combination of solenoid and a specimen of iron inside it make a power full magnet called

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Horse shoe magnet

Bar magnet

Electromagnet

10^-10 to 10¹⁸

To get three images of a single object,one should have two plane mirrors at an angle of

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90°

120°

30°

160°

1 year = ______.

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3.1536 x 10⁷s

3.1536 x 10^-7s

3.1536 x 10¹⁰s

3.1536 x 10^-10s

In case when there is no total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

The dimensions [ML²T^-2] refers to the quantity

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Work

Spring constant

Torque

Both A and C

An axis which is at right angle to both X and Y and Y axes direction is in space is called

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Unit vector axis

Zero vector axis

Z-axis

None of these

The spectrum of a star’s light is measured and the wavelength of one of the lines as thesodium’s line is found to be 589 nm. The same line has the wavelength of 497 nm whenobserved in the laboratory. This means the star is

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Moving away from the earth

Moving towards the earth

Stationary

Revolving around the planet

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 fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is

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100hz

150hz

60hz

250hz

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

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The distance between the objective and the eyepiece is 8m

The angular magnification of the planet is 200

The image of the planet is inverted

The objective is smaller than the eyepiece

Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

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2 : 3

3 : 2

3 : 4

4 : 3

The mass of a body measured by a physical balance in a lift at rest is found to be m.If the lift is going up with an acceleration a,its mass will be measured as:

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m (1 - a/g)

m (1+ a/g)

m

Zero

Multiplication of a vector is carried out by a

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Number

Direction

Number and direction

None of these

pgh in Bernoulli's equation has unit of

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Volume

Force

Work/Volume

None of these

The term torque is synonymous with

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Moment of force

Moment of inertia

Angular momentum

Pressure

A wire length L and radius r is fixed at one end and force F applied another end produces an extension x The extension produced in another wire of the same material of length 2L and radius 2r by force 2F is

Choose an answer

1

I

21

41

Diamagnetic substances are those in which

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Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

If the diameter and mass of the earth become two times their present values, then the weight of an object on the surface of the earth will

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Remain unchanged

Become half

Become one fourth

Be doubled

In reversible process there is a reversed change in

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Working substance

Thermal

Mechanical

B and C

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

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

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Torricelli's theorem

Venturi relation

Equation of continuity

None of these

Electrical activity of the retina the eye, generates which is used in electro ethnography as

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Current

Voltage

Resistance

None of these

To make a permanent magnet, a material should have

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hihg retentivety and small coercive force

low retentivety and high coercive force

low retentivety and small coercive force

high retentivety and high coercive force

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

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2λ

λ

2λ/4

None of these

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

When force F makes an angle θ with the position r relative to point O, then the toque will be

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τ = 0

τ = rF cos 0

τ = rF

rF sin θ

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 ?

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5.35 ms^-1

6.35 ms^-2

7.35 ms^-2

8.35 ms^-2

In an inelastic collision

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Both K.E and momentum are conserved

Both K.E and momentum are not conserved

Momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

The original source of biomass energy is

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Moon

Sun

Geothermal

None of these

The speed of flying bee is

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1 ms^-1

5 ms^-1

8 ms^-1

10 ms^-1

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

One mole of (NH₄)₂HOP_{4 contains _ moles of hydrogen atoms:}

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1

5

6

9

The moment of momentum is called

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Couple

Torque

Angular momentum

Force

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 dimensions of power are

Choose an answer

[ML²T²]

[ML²T^-2]

[ML²T^-3]

[M²LT^-3]

Michelson's interferometer is an instrument that is capable of measuring distance with

Choose an answer

low precision

high precision

extremely high precision

extremely low precision

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

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Work substances

Friction

0 K

All of these

The limit below which the Hooke s law holds well is called

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Yield point

Breaking stress

Tensile strength

Elastic limit

If the unit of force and length are increased by four times then the unit of energy is increased by

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2 times

4 times

8 times

16 times

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

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

Choose an answer

Smaller

Longer

Equal

None of these

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

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Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

In YDS experiment, data given isλ=500 nm, d=1 mm, L=100cm,∆y come out to be:

Choose an answer

0.5 cm

0.5 mm

0.5 nm

0.5 m

Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra - violet tubes used in a sun bed?

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5 x 10⁵ to 5 x 10⁸ Hz

5 x 10⁸ to 5 x 10¹¹ Hz

5 x 10¹¹ to 5 x 10¹⁴ Hz

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Which of the following is the relation of centripetal force?

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mv²/r

mv/r

mv³/r

mv³/r³

Conductors are those materials in which energy gap is

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very large (several eV)

very narrow (= 1eV)

either of them

none of them

A spring balance is graduated at sea level. If the body is weighted with this balance at consecutively increasing heights form the earth's surface the weight indicated by the balance will

Choose an answer

Go on increasing continuously

Go on decreasing continuously

Remain the same

First increase and then decrease

What is the S.I. unit of dipole moment ?

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cm

cm²

cm^-1

cm^-2

The motion of a body in a straight line is the motion in

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one dimension

two dimensions

three dimensions

four dimensions

An object is placed at a distance of f/2 from a convex lens.The Image will be

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At one of the foci,virtual and double its size

At,3/f real and inverted

At 2f,virtual and erect

At f,real and inverted

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

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Equal

Smaller

Greater

None of these

The Plano-convex lens used in the Newton's rings are of focal length

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Small

Long

Very large

None of these

The bottom of a container filled with liquid appear slightly raised because of

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Refraction

Interference

Diffraction

Reflection

The ratio of forces between two tiny bodies with constant charges in air and in an insulating medium of dielectric constant k is

Choose an answer

1 : K

K : 1

1 : K²

K² : 1

How many wave lengths of Kr⁸⁶ are contained in one meter

Choose an answer

1553164.13

652189.63

2347127.23

1650763.73

The stress which increase the length in one dimension only is called

Choose an answer

length stress

only have compressive stress

Have both tensile and compression stress

None of them

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

Choose an answer

1 x 10⁶ s

2 x 10⁶ s

2 x 10⁵ s

1 x 10⁵ s

Young's modulus for mercury is

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0

2

5

6

When a stress changes length, it is called the

Choose an answer

compressional stress

tensile stress

shear stress

any one of them

Electric intensity inside a hollow sphere is

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Minimum

Maximum

q / c_o

Zero

A process in which no heat enters or leaves the system is called.

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Adiabatic process

Isothermal process

Isochoric process

None of these

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper

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The upper half of the image is cut off

The brightness of the image is reduce

The brightness of the image is increased

Lower half of the image is cut off

Ordinary light has components of vibrations in

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one direction only

two directions

four directions

all directions

A highly irreversible process is

Choose an answer

Expansion

Explosion

Compression

None of these

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

Choose an answer

Linearly

Constant

Abruptly increases

None of these

An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow

Choose an answer

a circular path

a straight line

a hyperbola

a parabola

The frequency of the fundamental mode of open at one organ pipe is 400 Hz. Ifone end of pipe is closed the fundamental frequency will be

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800 Hz

600 Hz

400 Hz

200 Hz

The valence band of an atom in a solid

Choose an answer

is always empty

may or may not be empty

can never be empty

none of them

A beam of light enters air from water.Which of the following characteristics of light will not change in water

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Frequency

Wavelength

Velocity

Amplitude

The fluid which is incompressible and non viscous is called

Choose an answer

Ideal fluid

Non ideal fluid

Perfect fluid

All

The dichronic substances are used in the process getting plane polarized light

Choose an answer

Selective absorption

Refraction through crystals

Reflection from different surfaces

None of these

In carnot cycle, there are isotherms as

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One

Two

Three

Four

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

Which of the material is brittle ?

Choose an answer

Steel

Low carbon steel

High carbon steel

None of these

The SI units of flow rate are

Choose an answer

m²s^-1

m³s^-2

m³s^-1

m²s^-2

Mirage is a phenomenon due to

Choose an answer

Reflection of light

Refraction of light

Total internal reflection of light

Diffraction of light

Isothermal temperature Isobaric?

Choose an answer

Pressure

Volume

Heat

Entropy

If the velocity of a body changes by equal amount in equal intervals of time, the body is said to have

Choose an answer

acceleration

uniform acceleration

instantaneous acceleration

uniform velocity

The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

Choose an answer

Smaller

Larger

Very large

None of these

The dimensions of coefficient of viscosity are

Choose an answer

ML^-1T²

ML²T¹

ML^-1T¹

Nono of these

A null vector is defined as

Choose an answer

Zero magnitude

Arbitrary direction

Fixed direction

a and b

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

Choose an answer

25 Hz

50 Hz

12.5 Hz

5Hz

We can achieve polarization by

Choose an answer

Absorption

Reflection

Scttering

All of above

In case of streamed lined flow of liquid.the loss of energy is

Choose an answer

Maximum

Minimum

Infinite

Equal to what is in turbulent flow

In the study of interference and diffraction, we consider

Choose an answer

plane waves

plane wavefronts

both of them

none of them

Choose an answer

Initial velocity

Variable velocity

Instantaneous velocity

None of these

At terminal velocity the net force acting on it is

Choose an answer

Maximum

Minimum

Zero

None of these

A force applied on a body produces acceleration in

Choose an answer

Its opposite direction

Its own direction

Right angle to the force

None of these

When the same object is viewed at a shorter distance the image on the retina of eye is ______ and so the object appears ______

Choose an answer

Greater, small

Smaller, smaller

Smaller, larger

Greater, larger

Flow rate has SI unit

Choose an answer

m²/s

m/s

m³/s

m³/s²

In Young s double slit experiment if we use white light then

Choose an answer

Colored fringes will be observed

Bright fringes will be observed

Alternate dark and bright fringes will be observed

No interference fringes will be seen

Huygen's wave theory of light cannot explain

Choose an answer

Diffraction

Interference

Polarization

Photoelectric effect

Moment of inertia depends on mass and also on

Choose an answer

r

r²

r³

None of these

The sky appears blue because

Choose an answer

Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color

The typical example/examples of optically active crystals

Choose an answer

Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

For the angle of projection of a projectile for which its maximum height and horizontal range are equal

Choose an answer

50°

45°

60°

76°

If coplanar forces acting on a body form a closed polygon, then the body is said to be in equilibrium

Choose an answer

yes

False

Sometimes in equilibrium

None of these

In the self-cross product the angle is

Choose an answer

0°

45°

90°

180°

The frame of reference in which Newton first law of motion holds is known as

Choose an answer

Inertial frame of reference

Non-Inertial frame of reference

Every frame of reference

None of these

The approximate efficiency of electric motor is

Choose an answer

40 to 45%

49 to 56%

50 to 70%

50 - 93 %

The law of conservation is important in many sport like

Choose an answer

Diving

Gymnastics

Ice-skating

All of these

The cohesive forces between atoms, molecules or ions in crystalline solids maintain

Choose an answer

short range order

long range order

both of them

none of them

The symbol that is used to represent rotational inertia or moment of inertia is

Choose an answer

W

I

R

M

A temperature at which the material losses its orderliness is know as

Choose an answer

Ambient temperature

Curie temperature

Highest temperature

None of these

The torque is zero when the angle between F and r is

Choose an answer

90^o

180^o

270^o

0^o

To increase the magnification of a telescope

Choose an answer

The objective lens should be of large focal length and eyepiece should be of short focal length

The objective and eyepiece both should be of large focal lengths

Both the objective and eyepiece should be of smaller lengths

The objective should be small focal length and eyepiece should be of large focal length

A magnetic field

Choose an answer

Always exerts a force on a charged particle

Never exerts a force on a charged particle

Exerts a force on a charged particle if it is moving across the magnetic lines of force

Exerts a force on a charged particle if it is moving along the magnetic lines of force.

The quality of the moving body is called

Choose an answer

Motion

Momentum

Force

None of these

When the magnitude of the drag force becomes equal to the weight then net force acting on the the droplet is

Choose an answer

Zero

Maximum

Remains the same

None of these

Which of the following light move faster in water

Choose an answer

Red

Violet

Green

Blue

Propagation of light in an optical fibre requires

Choose an answer

Total internal reflection

Continuous refraction

Both

None of these

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h.The average speed of the car is

Choose an answer

37.5 km/h

10 km/h

42 km/h

40 km/h

if volume of a sphere increases then terminal velocity

Choose an answer

Remains same

Increases

Decreases

None

In petrol engine, the fourth stroke is the

Choose an answer

Power

Compression

Exhaust

None of these

The velocity of a projectile is maximum

Choose an answer

at the point of projection

just before striking the ground

none of them

both of them

Single mode step index fibre has feature/s like

Choose an answer

Very thin core

5 (μm) miameter

Relatively large cladding

All of these

Solids having partially field conduction bands are

Choose an answer

Insulator

Semiconductor

Super conductor

Semi conductor

A spinning cricket ball suffers

Choose an answer

An extra height

An extra velocity

An extra curvature

None of these

During adiabatic expansion change of 2 moles of gas the internal energy is 100 j, the work done this expansion is

Choose an answer

Zero

-100 J

200 J

100 J

Near and far points of a healthy human eye respectively are

Choose an answer

0 and 25 cm

0 and infinity

25 cm and 100 cm

25 cm and infinity

A heat engine converts thermal energy to mechanical work which is

Choose an answer

All

Partly

Some

None of these

A mass of 5 kg moves with an acceleration of 10m s^-2, the force applied is

Choose an answer

10N

50N

2N

20N

On reversing the direction of the applied force F,

Choose an answer

the magnitude of torque changes

the direction of torque remains unchanged

the direction of torque is reversed

both the direction and magnitude of torque change

Displacement is a physical quantity, which is a

Choose an answer

Scalar

Vector

Variable quality

None of these

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

Choose an answer

40 ton

80 ton

160 ton

5 ton

The kinetic energy acquired by a mass m in traveling a certain distance d.starting from rest. under the action of a constant force is directly proportional to

Choose an answer

√m

Independent of m

1 / √m

m

A women of 50 kg distributes her wright equally over high-heeld shoes. Each heel has an area of 0.75 cm². The pressure exerted by each heel will be

Choose an answer

6.66 x 10⁶ Pa

3.33 x 10⁶ Pa

1.67 x 10⁶ Pa

3.33 x 10^-6 Pa

Stoke's Law holds for bodies having

Choose an answer

Elliptical shape

Spherical shape

Curved shape

None

When the density is constant for the steady flow of incompressible fluid equation of continuity becomes

Choose an answer

ρ₁A₁V₁ = ρ₂A₂V₂

ρ₁m₁A₁V₁ = ρ₁m₁A₂V₂

A₁V₁ = A₂V₂

None of these

In Young s experiment the distance between two adjacent fringes for blue light is than that for green light

Choose an answer

Lesser

Greater

Equal

Lesser if distance between source and screen is large

Capacitor can be charged by transferring

Choose an answer

Negative charge

Positive charge

Both

None them

Mathematically the vertical velocity component is

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How many the multiplications of vectors are ?

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Three

Two

One

None of these

SI unit of angular moment is

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Kgms^-1

Kgm²s^-2

Kgm²s^-1

Kgm³s^-1

The relationship between Boltzmann constant K with R and N_Ais given as:

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k = RN_A

k = R/N_A

k = NR/N_A

None of these

At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m^-2

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50 m

10 m

5 m

1 m

The angular momentum is a vector quantity with due

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Perpendicular to the axis of rotation

Along the axis of rotation

At the axis of rotation

None of these

Crystalline solids are in the form of:

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Metals

Ionic compounds

Ceramics

Both A and B

All of these

Time between the normal heart beats is

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8 × 10^-1 sec

_{8 × 10}^-2_sec

8 × 10^-3 sec

None of these

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

How the fringe spacing varies as the separation of the slits increases

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Increases

Decreases

Increases very little

None of these

A pulsating DC can be converted into constant voltage by using

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Filter

Full wave rectifier

Half wave rectifie

Bridge rectifier

What is the weight of a 700 g of body on a planet whose mass is 1/7th of that of earth and radius is 1/2 of earth?

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400 gf

300 gf

700 gf

500 gf

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to:

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1^-2

1^-1

1

The idea of Michelsion's interferometer is based on the

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reflection of light

interference of light

refraction of light

all of them

One a clear day at noon, the intensity of the solar energy reaching the Earth surface is about

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1 KWm^-1

2 KWm^-2

3 KWm^-2

None of these

The constant K in Coulomb's Law depends upon

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Nature of medium

System of units

Intensity of charge

a & b

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

Einsteins theory donot tell the force of gravity acting on bodies instead, bodies and light maces along geodesies in

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Space time

Straight space time

Curved space time

All of these

The relation for the adiabatic change is

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PV = Constant

PV²= Constant

PV^r= Constant

PV^-r= Constant

A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope?

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The entire field of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

The efficiency of carnot's engine can never be 1 or 100% unless cold reservoir is

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100 K

1 K°

0 K°

None of these

A Perpetual motion is that motion which is

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Temporary

Continuous

Forever

None of these