Question # 1

Newton's first law of motion says a body will

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Remain at rest

Continuous move to with uniform velocity

Have no unbalanced external force act

All of these

A container has a small hole in the bottom.Air can go through this hole,but water cannot,this can be best explained by the statement that

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Water contains hydrogen atoms,air does not

Water molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

The moment of linear momentum is called

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Impulse

Torque

Angular momentum

Couple

Electric flux depends upon

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The charge only

Medium only

Both charge & medium

Permittivity & area

When a body acquired terminal velocity falling in a viscous medium than the acceleration

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a = -ve

a = +ve

a = g

a = zero

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

The more readily fissionable isotope of uranium has an atomic mass of:

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220

230

235

240

The measure of the deformation in a solid when stress in applied to it is called

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elastic constant

Young's modulus

strain

elasticity

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

The weight of 100 kg man in an elevator going up with an acceleration of 4ms^-2will be

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908 N

490 N

100 N

1380 N

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

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Bulk modulus

Compressibility

Pressure coefficient

Volume coefficient

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

In which mode, the refractive index steps down form 1.52 to 1.48 at the boundary with the cladding?

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Single mode step index

multimode step index

multimode graded index

all of them

The least distance of distinct vision changes with

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Time

Health

illness

Age

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

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

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Equivalent

Greater

Lower

None of these

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

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

What is the Young modulus of a meta?

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Extension/force

Force/extension

Strain/stress

Stress/strain

The direction of angular acceleration is

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Opposite of the axis of rotation

Along the axis of rotation

Perpendicular to the axis of rotation

None of these

A wire is stretched to double of its length. Its train is:

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2

1

0

0.5

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

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1

1.55

1.52

1.43

If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope

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Decreases

Increases

Gets halved

Remains unchanged

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

If the earth stop spinning the apparent weight of the body on the surface of the earth

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Increases

Decreases

Remain same

None of these

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

The most common method to obtain plane polarized light by using dichoric substance is:

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Selective absorption

Reflection from different surfaces

Refraction from different surfaces

Scattering

A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to

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r

r²

r³

r⁴

A rubber cord 100 cm long is elongated 1 cm by a stretching force of 0.2 N. The cross-sectional area of the cord is 0.04 cm². Find the Young's modulus for that rubber.

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0.5 N cm^-2

0.05 N cm^-2

50 N cm^-2

500 N cm^-2

In Bragg's formula, the path difference should beam integral multiple of the wavelengths

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d sin θ = nλ

d sin 2θ = nλ

2 d sin θ = nλ

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

The error is constant for ______ error

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Random

Systematic

Both (a) and (b)

None of these

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

The typical wavelength of the signal which we sent in the optical fibre is

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1000 nm

100 m

1.3 mn

1.3μm

A 4 m long string fixed at its ends resonate in 4 segments. The wavelength of the waveis:

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4m

0.5m

2m

0.25 m

The approximate efficiency of steam turbine is

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35 - 46%

40 - 43%

29 - 36%

30 - 47%

If the mass of earth becomes four times to its initial value than the value of g will be

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Does not change

Becomes four time

Become one fourth of its initial value

None of these

The work done in an equipotential surface is

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Maximum

Infinite

Zero

None of these

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

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

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ρ₁A₁V₁ = ρ₂A₂V₂

ρ₁m₁A₁V₁ = ρ₁m₁A₂V₂

A₁V₁ = A₂V₂

None of these

The magnification of a simple microscope of focal length 5cm is

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3

5

6

20

The magnitude of the electric field on the surface of a sphere of radius 'r' having a uniform surface charge density σ is

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σ/∈_o

σ/2∈_o

σ/∈_o r

σ/2∈_o r

A flowing liquid possesses

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K.E

P.E

Pressure Energy

All

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

The relative permitivity ∈_r for rubber is

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2.8

3.0

2.90

2.94

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

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0^o

90^o

180^o

275^o

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

Confining the light vibrations in one plane is called:

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Reflection of light

Interference of light

Polarization of light

Diffraction of light

As we go above the surface of earth the value of 'g'

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Increase

Remain Constant

Decrease

Increase slightly

A hole is drilled half-way to the centre of earth. A body weighs 200 N on surface of earth. How much will it weigh at bottom of the hole

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100 N

150 N

200 N

250 N

When the opposite faces of a rigid cube are subjected to shear stress, the shear strain produced is given by

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γ = Δa/a

tan θ

γ = θ

All of them

If A x B = B x A,then the angle between A and B is

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π

π/3

π/2

π/4

In Newton's rings the thickness of air film at the point of contact is

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maximum

minimum

equal to wavelength

zero

A force of 10N is required to move a body with a velocity 10 ms^-1the power developed is

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10 W

50 W

100 W

1000 W

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

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2 mgR

mgR

1/2 mgR

1/4 mgR

You are traveling in a car during a thunder storm. In order to protect yourself from lightning you would prefer to

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Remain in car

Take shelter under tree

Get on and lie flat on the ground

Touch the nearest electric pole

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

The total internal reflection takes place for glass-air boundary is then the angle is

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Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

The power of a pump motor is 2 kilowatt.The water raised by the pump per minute to a height of 10 m is nearly

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500 kg

7000 kg

1200 kg

Zero

Light is a type of energy which produces sensation of

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Sound

Feeling

Vision

None of these

Torque will be zero if

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body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

The internal energy of a gram mole of an ideal gas depends upon

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Pressure alone

Volume alone

Temperature alone

Both pressure and temperature

A monochromatic source of light gives light of

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one colour

two colours

four colours

seven colours

A typical rocket ejects the burnt gases at speeds of over

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4000 ms^-1

5000 ms^-1

6000 ms^-1

None of these

The conductivities of conductors (metals) have

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10⁵ (Ω)^-1

10⁷ (Ωm)^-1

10⁸ (Ωm)^-1

10⁹ (Ωm)^-1

When crest of one wave coincides with the trough of the other wave, it give rise to

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dispersion

constructive interference

destructive interference

polarization

The minute hand of a large clock is 3.0 m long. What is its mean angular speed

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1.4 x 10^-4 rad s^-1

1.7 x 10^-3 rad s^-1

5.2 x 10^-3 rad s^-1

1.0 x 10^-1 rad s^-1

The cross product of two perpendicular vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

The feature/features of powered ballistic missiles are

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Long ranges

Greater precision

Remote controlled

All of these

An organ pipe open at both ends and another organ pipe, closed at one end willresonate with each other, if their lengths are in ration of

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1:1

1:4

2:1

1:2

Which force is the medium independent force ?

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Electrostatic force

Nuclear force

Gravitational force

All of them

SI unit of potential difference is volt it can be written as

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JC^-2

JC^-1

JC

J.A

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

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Inter planar spacing

Wavelength

Incident angle

All of these

If the incident light contains different wavelengths the images of each wavelength for a certain value is diffracted in the

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Same directions

Different direction

Opposite direction

None of these

Curie temperature is a point where:

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Diamagnetism changes to paramagnetism

paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

paramagnetism changes to Ferromagnetism

Which equation is used to define resistance

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Energy = (current)²x resistance x time

Potential difference = current x resistance

Power = (current)² x resistance

Resistivity = resistance x area + length

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

A body of mass 3 kg lies on the surface of the table 2 m high It is moved on the surface by 4 m The change of P.E will be

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Zero

9.8 j

19.6 j

329 j

If a transverse wave has a speed of 10 m/ sec and frequency of 10 cycle/ sec itswavelength is:

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1 m

10^-2 cm

10 m

10 cm

Ordinary light has components of vibration in

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One direction

Different direction

All directions

None of these

When the both conditions are satisfied, then there is no

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Linear acceleration

Angular acceleration

Linear acceleration and angular acceleration

None of these

Change in length divided by original length is called:

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tress

Young's modulus

Strain

Both (B) or (C)

None of these

The approximate efficiency of solid state laser is

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35%

30%

27%

23%

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

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constant

increasing

decreasing

none of them

Spectrometer can be used to

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Measure wave length of light

Measure refractive index of the materials

Study spectra of light

All

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

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Telescope

Camera lens

Microscope

Spectrometer

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

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

Substances which undergo plastic deformation until they break are called:

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Ductile

Brittle

Malleable

Soft

Hard

Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller forces and the magnitude of resultant is 12.Then the magnitude of the forces are

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12 N,6 N

13 N,5 N

10 N,8 N

16 N,2 N

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

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2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

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

When milk is churned,cream separates because of

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Gravitational force

Centrifugal force

Frictional force

None of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

Moment of inertia of a solid disc or cylinder is

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mr²

1/2 mr²

1/3 mr²

1/4 mr²

The fractional effect between layers of following fluid is

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Viscosity of fluid

Velocity of fluid

Acceleration of fluid

Pressure of fluid

Hotness or coldness of an object is expressed in terms of a quantity called

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Heat

Temperature

Kelvin

None of these

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

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V^t = 2grρ/9η

Vt = 4grρ/9η

V_t = 4gr²ρ/9η

V_t = 4gr³ρ/9η

According to Einsteins theory, gravity follows the inverse square law expect in

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Weak gravitational field

Strong gravitational field

Very very weak gravitational field

None of these

Which of the following radiation will be focused farthest from a convex lens

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X - rays

γ - rays

Microwaves

β - rays

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

In which situation does diffraction occur?

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a wave bounces back from a surface

a wave meets another wave to produce a new wave

a wave passes from one medium into another

a wave passes through an aperture

If λ = 589 nm d=1.0 mm L=225 cm then fringe spacing ΔY is given by

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1.76 mm

1.80 mm

1.37 mm

1.33 mm

In petrol engine, the second stroke is the

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Compression

In take

Power

None of these

Shear modulus for ice is

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1.2

2.5

3

3.3

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

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

The synchronous satellites are very useful for

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Worldwide communicatioin

Weather observations

Navigation

All of these

The fringe spacing in case of blue light

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Increases

Remains the same

Decreases

None of these

At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes:

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Double

Remains constant

Half

None of these

The typical speed of Moon around the Earth is

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1000 ms^-1

2000 ms^-1

3000 ms^-1

4000 ms^-1

An ECG records the electric process in heart between

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Points on human skin

Two limbs of human foot

Two lungs of human

None of these

The vector sum of two forces is perpendicular to their vector differences.In that case the forces

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Are equal to each other in magnitude

Are not equal to each other in magnitude

Cannot be predicted

Are equal to each other

A ball is dropped vertically down and it takes time t to reach the ground.At time t/2:

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The hall had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

A motor operates at 20 rev/s. What is power delivered by it? If it supply a torque of 75 Nm

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75 W

85 W

90 W

9.4 x 10³W

When the length of a microscope tube increases its magnifying power

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Decreases

Increases

Does not change

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

Orbital velocity of an object mass m is proportional to

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m°

m²

m

m³

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

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

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50^o

45^o

60^o

76^o

Dot product of two mutual perpendicular vector is:

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0

1

∞

None of these

Fringe spacing in YDS experiment will be maximum if we use

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Red light

Green light

Violet light

Blue light

In an interference pattern of Ypung's double Slit (YDS) experiment:

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

A paratrooper is an example of

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Static equilibrium

Dynamic Equilibrium

Both static and dynamic equilibrium

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:

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60 kg wt

72 kg wt

48 kg wt

Zero

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

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

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

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Valence electron

Free electron

Loosely bound electrons

None of these

The speed of running cheetah is

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15 ms^-1

23 ms^-1

26 ms^-1

29 ms^-1

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow, the pressure of water at this place

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Increases

Decreases

Remains same

Depends upon several factors

Michelson,s interferometer can be used to measure

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Wavelength of light

Intensity of light

Amplitude of wave

None of these

A hollow metal sphere of radius 5 cm is change such that the potential on its surface 10 V. the potential at the centre of the sphere is

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Zero

10 volts

The same as that at a point 5 cm away from the surface

The same as that a at point 25 cm away from the surface

A conductor of capacity 50 μF is charged to 10V.The energy stored is

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1.25 x 10^-3 J

3.75 x 10^-3 J

2.5 x 10^-3 J

5 x 10^-3 J

In a experiment to determine acceleration due to gravity by simple pendulum a student commits 1 % positive error in the measurement of length and 3 % negative error in the measurement of time period The percentage error in the values of g will be

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7%

10%

4%

3%

The ratio of kinetic energy to potential energy for solids is

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If the focal length of objective is 10 mm find its magnification

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18

19

20

21

In reversible process there is a reversed change in

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Working substance

Thermal

Mechanical

B and C

The displacement time graph for the two particles A and B are straight lines inclined at 60° and 30° with the same axis.The ratio of the velocity of B is

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1:1

2:1

3:1

4:1

Which of the given elements is a diamagnetic material

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Antimony

Bismuth

Copper

All of these

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 physical quantity which has both magnitude and direction but does not satisfies parallelogram law of addition

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Must be a vector

May be both scalar and vector

Scalar

None

If rope of lift breaks suddenly,The tension exerted by the surface of lift is (a = Acceleration of lift)

Choose an answer

mg

m (g + a)

m (g - a)

0

In carnot cycle, there are adiabats

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One

Two

Three

Four

Examples of brittle substances are

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Glass

Copper

Lead

None of these

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

In terms of energy bands, semiconductors are those materials which at room temperature have conduction band

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Partially filled

Full filled

Slightly filled

None of these

The body is in a dynamic equilibrium when it is

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At rest

In motion

In uniform motion

Acceleration motion

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

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M°L°T^-1

M°L°T°

Not expressible in terms of MLT

Unit of solid angle is

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Radian

Degree

Steradian

Revolution

The Dimension of velocity is

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[LT]

[LT^-1]

[L^-1T]

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

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1.50 kw

15 kw

105 kw

150 kw

Brittle is the property of the substance in which a material undergoes

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Elastic deformation

Plastic deformation

Ultimate tensile strength limit

None of these

Which of the following types of optical fibre has a core which rages in diameter from 50 to 1000μm?

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single mode step fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

Under normal circumstances the volume of the blood is sufficient to keep the vessels

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Inflated all the time

Deflated all the time

Contracted all the time

Squeezed all the time

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm:

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3 series, 4 parallel

5 series, 2 parallel

2 series, 5 parallel

4 series, 3 parallel

The young modulus of steel is greater than that of aluminium.

Keeping the statement above in mind state which of the following is true

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Steel requires a larger stress on it for a given strain than does aluminium

Aluminium requires more force than steel does to get a similar extension as steel

Steel requires less force than aluminium does to get a similar extension as aluminium

Steel requires a larger strain on it for a given stress than does aluminium

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

Choose an answer

100 K

1 K°

0 K°

None of these

Triple point of water is the state in which ice, water and vapour coexists in equilibrium and its occurs uniquely at pressure and temperature is

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one particular

just one

May be another

None of these

There are some materials whose resistivity becomes zero below a certain temperature, called

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absolute zero

0° C

critical temperature

lower fixed point

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive forces

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

Types of physical quantities are

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one

Two

Three

None of these

The minimum velocity necessary to put a satellite into the orbit is called critical velocity of the value

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6.7 kms^-1

7.9 kms^-1

8.1 kms^-1

9.1 kms^-1

At the maximum height the V_fis

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Constant

Zero

Maximum

None of these

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

The distance between the two adjacent slits is called

Choose an answer

Thickness of the slit

Distance between and two slits

Grating element

None of these

Polarization of material in an electric field is a

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Permanent phenomenon

Purely a temporarily phenomenon

Time dependent phenomemon

None of these

The isothermal and adiabatic processes are employed in order

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Two isotherm and then two adiabates

Only isothermal one adibate

Only isothermal process

Only adiabatic process

To observe the phenomenon of interference of light, the light should be

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Monochromatic

Phase coherence

Coherent sources

All of these

Capacitor is a device use to store the

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A.C. current

D.C. current

Charge

Voltage

When the left is moving upwards with an acceleration 'a' then

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T - W = ma

W - T = ma

T = W

None of these

The ballistic missiles are useful for

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Short ranges

Long ranges

Medium ranges

None of these

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

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cm

cm²

cm^-1

cm^-2

Rotational kinetic energy of a disc is

Choose an answer

K.E. _rot = 1/2 mV²

K.E. _rot = 1/3 mV²

K.E._rot = 1/4 mV²

None of these

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

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

Steel is more elastic than rubber because

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It is a metal

Its density is higher

Ratio of stress to strain is more

Ratio of stress to strain is less

If a lens is cut into two piece perpendicular to the principal axis and only part is used the intensity of the image:

Choose an answer

Remains same

1/2 times

2 times

Infinite

The approximate efficiency of electric motor is

Choose an answer

40 to 45%

49 to 56%

50 to 70%

50 - 93 %

In an astronomical telescope the eye piece has the focal length f_e if

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Short

Long

Extremely long

None of these

A tall chimney has the advantage/advantages

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Reduce top pressure

Force

Upward flow of smoke

All of these

The power loss can also take place due to

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Information received can be inaccurate due to dispersion

Light signal may not be perfectly monochromatic

Signal accuracy may be affected by deflective source

All of these

Sharks due to their special organs, the "ampulae of lorenzini due to which they can detect the potential difference and can locate their prey very precisely of the order of

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Volt

Milli volt

Micro volt

Nano volt

An oil film floating on water surface show colours due to

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Interference

Diffraction

Scattering

Reflection

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

Light and heavy bodies have equal K.E, then which one has greater momentum

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The heavy body

The light body

Both

Cannot be said

Most widely used optical fibres are those which propagate light by

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total interval reflection

continuous refraction

both of them

none of them

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

The astronomical telescope consists of objective and eye piece.The focal length of he objective is

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Equal to that of the eye piece

Greater than that of eye piece

Shorter than that of eye piece

Five times shorter than that of the eye piece

The units of modulus of elasticity are

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Nm^-2

Nm²

Torr

Both B and C

For an ideal gas system, the internal energy and temperature are

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Directly proportional

Inversely proportional

Neither direct nor inversely proportional

None of these

The acceleration of a motor car is 8 m/s².If the diameter of its wheel be 2 metre,its angular acceleration will be

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8 m/s²

8 radian /s²

16 m/s²

16 radian/s²

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

The organic substances which shows optical rotation when they are in solution

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Tartaric acid

Sugar

Alcohol

a and b

The critical temperature of lead is

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1.18 K

4.2 K

3.72 K

7.2 K

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

The velocity-time graph of a car is a straight line which rises the same height for equal intervals of time, if it moves with

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zero velocity

constant velocity

zero acceleration

constant acceleration

In Young's double slit experiment, the fringe width depends on

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wavelength of the light used

distance between the slits and screen

distance between the slits

all of them

When a germanium atom is doped with phosphorous atoms it becomes

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N-type semiconductor

p-type semiconductor

An insulator

None of them

Newtons laws were published in

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1587

1687

1787

1678