Question # 1

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

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The focal of the eye piece

The least distance of the distinct vision

The focus of the objective lens

Infinity

The original source of hydroelectric is

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Water

Wind

Sun

Moon

For a freely falling elevator

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a = W

a = T

a = 0

a = g

The centre of gravity of an object is

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The force of gravity on the object

The point about which the object rotates

The point at which the total weight of the object act

none of these

The approximate efficiency of Nuclear reactor

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33%

32%

39%

45%

Geysers usually occur in

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Hot regions

Cold region

Volcanic regions

All of these

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

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Straight line

Straight line rises equally

Horizontal straight line

None of these

A lift is moving downwards at a very high constant speed. A passenger present inside the lift standing on a weighing machine would notice that his weight

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is shown as zero on the scale

becomes zero

remains constant at a value less than this real weight

remains the same as his real weight

Wavelength of the wave is the distance between the particles of the medium having adifference of:

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Zero

n

2n

𝜋2

A chiminey works best when it is

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Tall

Exposed to air currents

Not tall but wide

a and b

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

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f/₀-f_e

f₀+f_e

2f_e-f_e

None of these

When the pressure of a fixed mass of a gas is decreased under isothermal condition there is

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Fall of temperature

Increase of density

No change in internal energy

A decrease in the value of PV

High energy physics is the physics of

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Nucleus

Subatomic particles

Plasma physics

Astrophysics

Colours seen on oily water surface by the incident white light is due to

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Diffraction

Interference

Refraction

Reflection

For interference to occur, the light coming from the two slits should

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be monochromatic

come from the same source

have a constant path difference

all of them

The ratio of stress/strain is called as

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Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

The energy density for capacitor is

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1/2 ∈_oE²

1/2 ∈_rE²

1/2 ∈_r∈_oE²

1/2 ∈_o∈_rE

If 'd' 'm' and fringe spacing ΔY are known, the interference effect due to light of λ

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Cannot be determine

Can be determined in same cases

Can be determined

None of these

At diastolic pressure

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Flow become laminar

Gurgle disappears

External pressure becomes equal

All of these

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

The instrument used to gather information from the far side of the Universe is

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Compound microscope

Radio telescope

Astronomical Telescope

Simple mircroscope

The drag force F on a sphere of radius 'r' moving slowly with speed V through a fluid of viscosity η by Stake's law

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F = πηra

F = 6πηrω

F = 6πηrV

F = 6πηraV

A Carnot engine works between 600K and 300. If heat input is 100J then the output is

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300 J

400 J

50 J

56 J

Which of the following quantities is a vector

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Volume

Temperature

Displacement

Density

The angle between A and B is θ.The value of the triple product A,(B x A) is:

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A²B

Zero

A²B sin θ

A²B Cos θ

The rate at a which the angular displacement is changing with time is called

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Angular acceleration

Angular velocity

Average angular velocity

None of these

The modulus of elasticity of a liquid is:

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Zero

1

Infinity

A value not one of those mentioned above

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

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Work

Spring constant

Torque

Both A and C

Angular momentum is conserved under

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Central force

Constant force

Variable force

Uniform force

The function of compensator plate in interferometer is to

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Interfere properly

To equalize the distance of M₁ and M₂

Reflecting light properly

None of these

For interference to occur,the interfering beams of light must be

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Of different frequencies

Coherent

White light

Added

Power of a lens is equal to

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Focal length in meters

Reciprocal of focal length expressed in meters

Double the focal length

Half the focal length

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

Sunset makes sky appears reddish because of:

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Diffraction of sun rays

Refraction of light

Scattering of light from dust particles

Polarization of ligth

Sunlight is also partially polarized because of Earth's atmosphere due to scattering by

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Water vapours

Air particles

Dust particles

All of these

Energy per unit volume of a stretched wire is

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(1/2) x load x extension

Load x stress

Stress x strain

(1/2) x stress x strain

Isothermal temperature Isobaric?

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Pressure

Volume

Heat

Entropy

Glare produces when light reflects from water snow and rough road surfaces when their angle of incidence is

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Small

Large

Very large

None of these

The viscosity of water is

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0.019 x 10^-3 Nsm^-2

0.801 x 10^-3 N-sm^-2

6.29 x 10^-3 N-sm^-2

0.081 x 10³ N-sm^-2

The diffraction grating is used to determine

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Intensity of light

Wavelength of light

Refractive index of prism

None of these

Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

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Increasing gradually

Decreasing gradually

It is constant at the centre

None of these

The weight of man is an elevator descending down with an acceleration of 9.8 ms^-2will become

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Half

Double

Unchanged

Zero

The SI unit of stress is

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Nm²

Nm

dynesm^-1

N

The original source of fossil fuels is

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Geothermal

Biomass

Sun

None of these

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

The reason why weight exists is that

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the earth exerts gravitational force on objects

both the earth and any object on it has mass

gravity exists

All of them

For the same value of resistors the output of non-inverting amplifier compared to the output of inverting amplifier is, (ignoring phase difference)

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Greater

Equal

Smaller

Undefined

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

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Doubles

Becomes halved

Becomes one fourth

Becomes four times

Geometrical optics cannot give following characteristics for a microscope

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Image position

Image size

Resolution of image

Any of the above

Which of the following graph represents the velocity of a spherical body falling through a viscous medium

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Number of supplementary units are

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three

two

seven

five

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

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F_D = 6ηrv_t

F_D = 6πηrv_t²

FD = 6πηr²v_t

FD = 6πηrv_t

When a mirror of a Michelsion's interferometor is moved a distance of 0.5 mm, 2000 fringes are observed, the wavelength of the light used is

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5000 mm

5000°A

500 cm

2000°A

The source in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

One ferms is equivalent to

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10^-14 meter

10¹⁴ meter

10^-15 meter

10¹⁴ meter

Electric flux depends upon

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The charge only

Medium only

Both charge & medium

Permittivity & area

The moment of inertia of a body does not depend upon its

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Angular velocity

Mass

Distribution of mass

Axis of rotation

A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is

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F

2F

4F

8F

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

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Mass of the nucleus increases

Mass of the nucleus decreases

Charge on the nucleus increases

Charge number decreases

The principle of rocket motion is based on the

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First law of motion

Second law of motion

Third law of motion

None of these

Si system is based upon ______ kind of units

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One

Two

Three

Four

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

A body is dropped from a tower reaches the earth surface in 4 sec where g is 10 m/s²the height of tower is

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80 m

20 m

160 m

40 m

A particle is moving in a circle with uniform speed v.In moving from a point to another diametrically opposite point.

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The momentum changes by mv

The momentum changes by 2mv

The kinetic energy changes by (1/2) mv²

The kinetic energy changes by mv²

When a vector is multiplied by a scalar, the product of the quantity will be

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A new vector quantity

New direction

Same direction

a and c

Which type of fibre is used to send the signals of long distances?

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single mode step index fibre

multimode step index fibre

multimode graded index fibre

all of them

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

In the following velocity time graph,the distance traveled by the body in meters is

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200

250

300

400

The waves produced in a stretched string are called

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Stationary waves

Mechanical waves

Transverse mechanical waves

None of these

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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Plasticity

Breaking point

Proportional limit

Strain

One angstrom equal:

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10^-8m

10^-9m

10^-10m

10^-11m

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

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50°

45°

60°

76°

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

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

The dimensions of force are

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[MLT^-1]

[M^oLT^-2]

[MLT^-2]

[ML⁰T^-2]

Sky seems blue due to

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Diffraction

Polarization

Dispersion

Scattering

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

Each atom in a metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about the centre of the crystal

None of these

The effect is to increase the inflating the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

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

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Inertial frame of reference

Non-inertial frame of reference

Every frame of reference

None of these

Shear modulus for mercury is

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0

12

27

42

What will be the colour of the sky as seen from the earth if there were no atmosphere ?

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Black

Blue

Orange

Red

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

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Very little confined

Largely confined

Totally confined

None of these

A stationary wave is established in a string which vibrates in four segments at afrequency of 120 Hz. Its fundamental frequency is:

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15Hz

60Hz

30Hz

430Hz

The method by which only one half of A.C cycle is converted into direct current is called

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half wave amplification

half wave rectification

Full wave rectification

full wave amplification

The band above the valence band is

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Completely filled band

Conduction band

Forbidden energy band

None of these

The ratio of volumetric stress to volumetric strain is called

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Young's modules

Bulk modulus

Shear modulus

Hooke's law

Terminal velocity is

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Uniform and maximum

Uniform

Maximum

Neither uniform nor maximum

The dielectric constant K of an insulator cannot be

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2

10

5

∞

Which of the following correctly states the base units of weight?

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N

N m s^-2

Kg m s^-1

Kg m s^-2

The twinkling of stars is due to

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The fact that stars do not emit light continususly

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

The Dimension of length is

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[L]⁰

[L]^-1

[L]

None of these

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

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Doubles

Is halved

Becomes one fourth

Becomes four time

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

A semiconductor in its extremely pure form in known as

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Extrinsic semiconductor

Intrinsic semiconductor

Both a and b

None of these

Significant figure in 0.00110

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One

Two

Three

Four

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

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

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Valence electron

Free electron

Loosely bound electrons

None of these

No entropy change is associated with:

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Isothermal

Adiabatic process

Isobaric process

None of them

Which phenomenon of light conclusively prove that light waves are transverse waves

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Reflection

Diffraction

Interference

Polarization

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h.The force required to stop the vehicle in 10s force required to stop the vehicle in 10s is:

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120 x 10.8 N

180 N

720 N

360 N

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

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

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

Which of the following statements about angular momentums is correct?

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Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

The light which has components in all directions is called

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unpolarized light

polarized light

intense light

none of them

Light is a type of energy which produces sensation of

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Sound

Feeling

Vision

None of these

Two forces 3 N and 2 N are at an angle 0 such that the resultant is R.The first force is now increased to 6 N and the resultant becomes 2R.The value of θ is

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30°

60°

90°

120°

Two charges are separated by 0.5 m. Now the 0.25 m distance between the two charges is reduced to half of the first distance, how would the electric force become

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4 times

8 times

12 times

16 times

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

If two ping pong balls are suspended near each other and a fast stream of air is produced in the space between the balls, then the balls.

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Come closer

Move farther

Remain in original position

Fall down

The consumption of energy by a 60 watt bulb in 2 sec is

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60 J

120 J

30 J

0.2 J

Stress may cause a change in:

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Length

Volume

Shape

Any of these

None of these

The largest satellite system in managed by countries

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112

140

126

107

The diodes works on

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A.C

D.C

both A and B

None of these

The pressure P of a gas at constant temperature varies with its density P

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Directly

Inversely

Equal

None of these

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively.Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

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

In Young's double slit experiment for the interference of light, the central region of the fringe system is

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Bright

Dark

Bright and dark

None of these

Identify the correct unit of pressure among t bese

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kgms^-1

kgm^-1s^-2

kgm²s^-2

kgm^-2s^-1

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

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

The maintaining the elastic limits of any body, the relation stress to strains is called

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Hooke's law

Pascal's law

Young's law

None of them

Which of the fluid has ideal behaviour at low speeds

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Air

Blood

Honey

None of these

The torque acting on a body is the rotational analogue of

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Mass of the body

Linear kinetic energy of the body

Linear velocity of the body

Force in linear motion

At the maximum height the V_f is

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_Constant

Zero

Maximum

None of these

Which of the following is an optically active material

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Solution of cane sugar

Liquid nitrogen

Mercury

Polaroid

One degree of thermodynamics scale of temperature is called:

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Celsius

Fahrenheit

Kelvin

Radian

A device which convert DC into AC is calleD)

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Invertor

Generator

Rectifier

Motor

Approximate power of flash light in watts: (2 cells)

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1.2

1.5

1.55

1.56

Light appears to travels in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

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

The insulators have conductivities ties in the range

Choose an answer

10^-10 to 10^-20 (Ωm)^-1

10^-5 to 10^-20 (Ωm)^-1

10^-15 to 10^-25 (Ωm)^-1

None of these

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

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One 𝛼 and one 𝛽

Two 𝛼 and one 𝛽

e 𝛼 and two 𝛽

Two 𝛼 and two 𝛽

The systolic blood pressure comes when

Choose an answer

Vessel collapse

Cutting off the blood flow

None of these

All of these

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

State the physical quantity represented by [ML²T^-2K^-1] where K is represents the unit temperature

Choose an answer

Thermal capacity of the body

Thermal conductivity

Specific thermal capacity

Entropy

The dimension of gravitational constant G are

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[ML²T^-2]

[M^-1L³T^-2]

[M^-1L²T^-1]

[M^-1L^-2T^-2]

The wave nature of light was first proposed by

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Huygen

Thomas Young

Newton

Compton

The force required to bend the normally straight path of the particle into circular path is called

Choose an answer

Applied force

Normal force

Reactional force

Centripetal force

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 uniformly accelerated equations are useful only for

Choose an answer

Angular motion

Curved motion

Linear motion

None of these

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

Choose an answer

200

Over 200

400

500

Interference and diffraction of light confirms its:

Choose an answer

Particle nature

Dual nature

Wave nature

Electromagnetic nature

When a body is moving on a surface the force of friction is called

Choose an answer

Static friction

Dynamic firction

Limiting friction

Rolling friction

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

Choose an answer

Gravitational force

Centripetal force

Centrifugal force

Resistance

Young's modulus for tungsten is

Choose an answer

90

190

390

590

Approximate power of a car moving at a speed of 90 kmh^-1 in watts

Choose an answer

1.1 × 10⁵

1.2 × 10⁶

1.3 × 10⁷

1.4 × 10⁸

The three equation of motion are useful only for

Choose an answer

linear motion with increasing acceleration

linear motion with uniform acceleration

linear motion with zero acceleration

linear motion with varying acceleration

The magnifying power of an instrument is expressed in

Choose an answer

Radians

Degrees

No units

None of these

The process of doping causes resistivity of semiconductor to

Choose an answer

Increase

Decrease

Same

Become zero

Propagation of light in an optical fibre requires

Choose an answer

Total internal reflection

Continuous refraction

Both

None of these

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

Radian is the unit of angular displacement which is

Choose an answer

Less than degree

Greater than degree

Equal

None of these

The light signal in graded index fibre is totally confined due to

Choose an answer

Total inernal reflection

Continuous refraction

Both a and b

Dispersion

A paratrooper is an example of

Choose an answer

Static equilibrium

Dynamic Equilibrium

Both static and dynamic equilibrium

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

What is the bulk modulus of a material?

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strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

A 50 kg man is falling freely force acting on it will be

Choose an answer

5 N

50 N

500 N

zero

The dimensional formula for modulus of rigidity is:

Choose an answer

ML^-1T¹

ML^-2T²

MLT¹

ML^-1T^-2

The value of g is maximum at

Choose an answer

The equator

The poles

The center of earth

Between poles and equator

An electric field lines provides the information about

Choose an answer

Electric force

Direction

Medium

All of them

The low blood pressure is

Choose an answer

70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

The energy dissipated per cycle for iron in hysteresis loop is

Choose an answer

less than for steel

equal to the steel

more than the steel

any one of them

The first superconductor was discovered by

Choose an answer

Fermi

Kmaerlinghormes

Weinberg

None of these

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

Choose an answer

1.50 kw

15 kw

105 kw

150 kw

The rater of flow is measure in

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Liter-sec

Liter/sec

Liter/sec²

Sec/liter

The size of the domains in such that they can contain

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10²to 10⁴atoms

10⁴to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The Permitivity ε_o of free space has the value in S.I. units is

Choose an answer

8.85 × 10^-10 C² N^-1 m^-2

8.85 × 10^-11 C² N^-1 m^-2

8.85 × 10^-12 C² N^-1 m^-2

8.85 × 10^-13 C² N^-1 m^-2

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

Choose an answer

electric field

magnetic field

either of them

both of them

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

Choose an answer

360000

72000

36000

129600

If focal length of objective is increased

Choose an answer

Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

The wavelength of refractive wave in a denser medium is

Choose an answer

Same as that of the incident wave

Become smaller than the incident

Becomes greater than the incident wave

None of these

Which will be more effective in knocking a bear down

Choose an answer

A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

In electromagnetic waves electric and magnetic field ar

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Parallel

Antiparallel

Perpendicular

Sometimes parallel sometimes perpendicular

When a body is stationary

Choose an answer

There is no force acting on it

The force acting on it are not in contact with it

The combination of the forces acting on it balance each other

The body is in vacuum

For average velocity of a body, it has

Choose an answer

Straight path

Curved path

Steady motion or variable

All of them

Which of the following phenomenon cannot take place if we consider light as longitudinal wave?

Choose an answer

diffraction

interference

polarization

reflection

Michelson interferometer is based upon

Choose an answer

Interference

Diffraction

Polarization

Reflection

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

Choose an answer

Energy

Momentum

Angular momentum

Power

Equal charges are given to two spheres of different radii The potential will

Choose an answer

Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both sphere

Depend on the nature of material of sphere

If unit of length mass and time each be doubled the unit of work done is increased by

Choose an answer

4 times

6 times

8 times

2 times

The perpendicular distance form the line of action of force to the pivot point is called

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couple arm

angular distance

moment arm

none of them

When the stress change length of a body, it is called:

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Shear stress

Tensile stress

Volume stress

Any of these

None of these

SI unit of work is

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N-m

N-m²

N-ms^-1

N-ms^-2

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

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Telescope

Camera lens

Microscope

Spectrometer

On reversing the direction of the applied force F,

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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

A small metallic sphere is dropped in a long jar of honey, it will move as

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Float in jar

It will move with g

Fall with acceleration less than g

Grain terminal velocity

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

The function of colimator is

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To converge the incoming rays

To make the parallel rays from source

In which the source of light is kept

None of these

When m₁= m₂, the velocities of both bodies become

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V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

A spherical wavefront is that which has

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A source

A point source

An extended source

None of these