Question # 1

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

Two masses m₁ and m₂ have equal momentum their kinetic energies are in ratio of

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m₂: m₁

m²1 : m₂²

m₁: m₂

m₂^{2 :}m²1

The refracting edge of the prism must be parallel to the axis of rotation of the telescope, so that the turn table is leveled using

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Screws of the spectrometer

Leveling screws

Turn table screw

None of these

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young;s modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized.

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

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Current loss

Voltage loss

Hysteresis loss

None of these

The wavelength of light is 6000°A, the number of waves continued in 0.01 m distance will be

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1.6 x 10⁴

3 x 10³

2 x 10⁶

4 x 10⁸

Which of the following statements for an object in equilibrium not true?

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The object must be at rest

The object can be at rest

The object is moving at constant

The acceleration of the object is zero

When the first condition of equilibrium is satisfied the body will be in

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complete equilibrium

translational equilibrium

rotational equilibrium

all of them

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

If the dot product of two non-zero vectors vanishes,the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

When a radioactive nucleus emits a 𝖰 −paritcles, the mass number of the atom:

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Increases by one

Decreases by one

Remains the same

Decreases by four

A closed organ pipe and an open organ pipe have their first overtones of identicalfrequency. Their respective lengths are in the ratio:

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1 : 2

4 : 3

2 : 3

3 : 5

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

The centripetal acceleration is supplied by

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Applied force

Gravity

Initial velocity

None of these

A Celsius degree is larger than a Fahrenheit degree by

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5/9

9/5

9/10

9/8

When m₁and m₂and V₂= 0 then velocities become

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V'₁= 0 and V'₂= V₁

V'₂= 0 and V₁= V'₁

V₁= 0 and V'₁= V₂

None of these

Which one of the following is nearly monochromatic

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Light from candle

Light from simple lamp

Light from sodium lamp

Light from sun

nuclear physics deals with

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Atom

Atomic nuclei

Elementary particles

Light

Accuracy of a measurement depends on

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Percentage uncertainty

Fractional uncertainty

Less absolutely

None of these

In 1986 a new class of ceramic material was discovered at temperature as high as

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19 K

78 K

108 K

12 K

High temperature superconductors have temperature

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Above 77 K

Below 77 K

At 77 K

None of these

Generally thermometers make use of the fact that most of the liquids

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Compress on heating

Expand on heating

Evaporate on heating

Sublime on heating

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

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Positive

Negative

Zero

None of these

Inkjet printer can produce

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Black and white copy

Coloured copy

Both

None of these

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

The saturation of the material reached when magnetic flux density changes from

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Zero to minimum value

Zero to maximum value

Maximum to zero value

Minimum to negative value

Collision between gas molecules are perfectly elastic when collide with

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Walls of container

Themselves

Both

None of these

SI unit of temperature

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Centigrade

Celsius

Kelvin

All of these

Young's modulus for steel is

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100

200

300

400

The unit of product RC is

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volt

Resistance

Second

Coulomb

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

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Four , Six

One , four

two , five

None of these

A body of mass 1.0 kg is falling with an acceleration of 10 m/s² Its apparent weight will be (g = 10 m/s²)

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1.0 kg wt

2.0 kg wt

0.5 kg wt

Zero

To get high resolving power for a telescope one should use

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Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

Two balls of different masses have same K.E then

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The heavier ball has greater momentum than the lighter ball

Lighter ball has greater momentum than the heavier ball

Both the balls have equal momentum

Both the balls have zero momentum

The internal energy depends on

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Path

Initial and final states of the system

Time

None of these

The conductivity of super conductor at critical temperature becomes

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Zero

1

Infinite

Negative

A stress which decreases the stress along one dimension is known as:

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Compressive stress

Tensile stress

Linear stress

Both (B) and (C)

For which color of light the refractive index of glass is larger

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Red

Green

Blue

Violet

Between layers of liquid in relative motion, viscosity introduces

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Tangential forces

Radial forces

Intermolecular forces

Cohesive forces

A circular disc rolls down an inclined plane without slipping. What is its rotational kinetic energy

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1/2 MR²ω

1/4 MR²ω²

1/2 M²R²ω²

3/4 M²R²ω²

Moment of inertia of thin rod is

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1/2 mL²

1/6 mL²

1/12 mL²

1/15 mL²

When seen in green light the saffron and green portions of our National Flag will appear to be

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Black

Black and green respectively

Green

Green and yellow respectively

Stoke's law holds for bodies of the shape

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Spherical

Rectangular

Oblog

All of these

The solids which have structure in between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

With the rise of temperature the amplitude of atoms

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Slow down

Fixed

Increases

None of these

All points on a rigid body rotating about a fixed axis have

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Same angular displacement

Same angular acceleration

Donot have angular speed

None of these

The temperature of igneous rocks is about

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100 ^oC

200 ^oC

250 ^oC

270 ^oC

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

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

Base quantities are

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Scalars

Vectors

Both

None of these

The magnetic field produced due to circulating currents. The idea was first given by

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Faraday

Ampere

Lenz

None of these

Light waves produce interference when

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source are monochromatic

source are phase coherent

sources are close together

all of them

The difference between 1st ring fringe and 1st dark fringe is measured as

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λD/2d

λD/d

λD/4d

2λD/d

The disadvantage of the step-index fibre can be reduced by

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graded index fibre

non-graded index fibre

both of these

none of these

The work done is stretching a spring of force constant 20 Nm^-1 by an amount 30 cm is

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0.6 J

0.9 J

1.2 J

1.5 J

The value of g is maximum at

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The equator

The poles

The center of earth

Between poles and equator

At the top of the trajectory of a projectile the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Antiparallel to each other

The equation (V₁- V₂) = - (V₁- V₂) shows that relative velocities before and after the collision has the

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same magnitude and same direction

same magnitude and opposite direction

different magnitude and opposite direction

different magnitude and same direction

The high-tensile steel used to support the roadway of a suspension bridge breaks under a stress of 2 x 10⁹Pa. Find the minimum cross-sectional area for a cable if it is to support a load of mass 2 x 10⁵kg.

(g = 10 N kg^-1)

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10^-2m²

10^-1m²

10^-4m²

10^-3m²

The young s modulus for a perfect rigid body is

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Zero

1

Infinite

None of these

Which optical fibre is used for shorter distances only?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

all of them

In projectile motion, the acceleration in horizontal is

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Maximum

Minimum

Zero

None of these

Mathematically the instantaneous velocity is defined as

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The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

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

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

Shear modulus for lead is

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1.7

4.9

5.6

6.2

Heat is a form of

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Power

Work

Energy

Motion

In Compton effect, it was considered that X-rays consist of:

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Electrons

Positrons

Photons

All of these

If 5000 lines per cm are ruled on different on a diffraction grating then the slit spacing will be

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5 x 10^-3A°

2 x 10^-4A°

5 x 10^-5A°

2 x 10⁴A°

The torque will be zero if the angle between r and F is

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zero

30°

45°

90°

During a negative β-decay

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

The ability of anybody to return, to its original shape is called

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Elasticity

Elastic force

Stress

Strain

Solid angle is

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Two dimensional angle

Three dimensional angle

One dimensional angle

Multi-dimensional angle

The distance between different interference fringes are:

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Variable

Same

Different

None of these

With increase in temperature the viscosity of

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Both gases and liquid increase

Both gases and liquid decrease

Gases increases and of liquid decrease

liquid increases and of gases decreases

The turning effect of force is called

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torque

moment of force

both of them

none of them

The equation W = ________𝜟U represents:

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Thermal process

adiabatic process

Isobaric process

None of these

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

Distance to nearest galaxy from earth is

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10¹⁰m

10¹⁵m

10⁴⁰m

10³⁰m

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

If it is assumed that a frictional force f is present, during the downward motion their

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mgh - f = 1/2 mV²

2mgh - f = 1/2 mV²

mgh - f = 1/2 mV²

None of these

If a unit charge experiences a force of 100N at a point electric field then intensity will be

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100 N/C

16 x 10^-19 N/C

10 N/C

10 x 10^-19 N/C

In single slit diffraction the condition for second minimum is

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Sinθ = λ

d Sinθ =2λ

d Sinθ =3λ

d Cosθ =0

Multimode step index fibre has a core of relatively larger diameter such is

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125 μm

175 μm

50 μm

100 μm

In case of a point source, the shape of the wavefront is

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straight

elliptical

oval

spherical

The magnification of a compound microscope of object and eye piece of focal lengths f₀and f_e, respectively is

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If the direction of r and F are reversed, then

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The magnitude of the torque changes but direction remains unchanged

The magnitude of the torque does not change but direction reverses

The magnitude and direction of the torque change

The magnitude and direction of the torque remain unchanged

The magnifying power of an instrument is expressed in

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Radians

Degrees

No units

None of these

The mass distribution of a rigid body is

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Uniform

Not uniform

Both

None of these

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

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Energy

Momentum

Charge

Both (a) & (b)

Young's modulus for water is

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0

2

5

9

Length of a metal cylinder with the help of a vernier callipers of least count 0.01 cm is 5.35 cm. Its percentage uncertainty in length is

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2%

2.3%

0.2%

0.3 %

The ability of body to return to its original shape (after the force is removed) is called:

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Elasticity

Ductility

Stress

Strain

Any of these

Ratio of moment of inertia of two objects A and B is 2:3 which of the following is the ratio of torques of A and B respectively. If both are being rotated with constant angular acceleration

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3:4

2:3

3:2

4:3

According to Huygen's principle, the new position of the wavefront after a time can be found by constructing a surface that touches all the

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primary wavelets

secondary wavelets

either of them

none of them

As isolated system in which

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No internal force acts

No external force acts

No internal and no external force acts

None of these

For earth the escape velocity is 11.2 kms^-1. For a planet whose mass and radius are twice those of the earth, the escape velocity will be

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44.8 kms^-1

22.4 kms^-1

11.2 kms^-1

2.8 kms^-1

A bullet of mass 10 g hits a target and penetrates 2 cm into it.If the average friction offered by the target is 100 N,then the velocity with which the bullet hits the target is

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10 ms^-1

1052 ms^-1

20 ms^-1

20√2 ms^-1

What will be efficiency of carnot engine when it is operated between the temperatures 47^oC and 127 ^oC:

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Reversible

Irreversible

Sometimes A and B

None of these

The initial velocity with which a body projected upward and never comes back is called

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Kinetic energy

Terminal velocity

Escape velocity

None of these

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

Torque is the resultant of

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Dot product of force and moment arm

Simple product of force and moment arm

Cross product between position vector and force

Addition of force and moment arm

A 100W, 220V bulb is operated on a 110V line, the power consumed is:

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25W

75W

50W

100W

The property of bending of light around obstacies is called

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interference

reflection

diffraction

polarization

When three forces acting at a point are in equilibrium then

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Each force is numerically equal to the sum of the other two

Each force is numerically greater than the sum of the other two

Each force is numerically greater than the difference of the other two

None of the above

Fraunhofer's lines commonly visible in the sun's spectrum are examples of

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Line emission spectrum

Line absorption spectrum

Band emission spectrum

Band absorption spectrum

Wavelength of light, on the average, is given by

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10^-14m

10^-10m

10^-6m

10^-4m

When a meteorite enters into earth atmosphere its energy converts into

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Kinetic energy

Heat energy

Mechanical energy

None of these

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

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Positive charges

Negative charges

Neutral charges

a & b

A charge is 90C passes through a wire in 1 hour and 15 minutes. Wat is the current in the wire?

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10mA

20mA

15mA

25mA

The work done by the system on its environment is considered

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Natural

Positive

Negative

None of these

Domains are present only in

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Diamagnetic material

Para magnetic material

Ferromagnetic material

All of these

Which one of the following has only bulk modulus?

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Diamond

Glass

Tungsten

Water

A heat engine converts thermal energy to mechanical work which is

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All

Partly

Some

None of these

The torque is equal to

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Rate of change of velocity

Rate of change of angular momentum

Rate of change of linear momentum

Change of linear momentum

Which of the following is dimensionally correct

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Pressure = energy per unit area

Pressure = energy per unit volume

Pressure = force per unit volume

Pressure = Momentum per unit volume per unit time

Avogadro number is the no of molecules present in

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One liter of gas at STP

22.4 liter of gas at STP

22.4 mole of gas at STP

48.8 liter of gas at STP

One erg is equal to

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10⁵j

10^{7 j}

10^-3 j

10^-7j

The axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

An inertial frame of reference in which acceleration is

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Very high

Very very low

Zero

None of these

A semiconductor is known to have an electron concentration of 8 x 10¹³ per cm³ and hole concentration of 5 x 10¹² per cm³ the semiconductor is

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n-type

P-type

Intrinsic

None of these

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

A person is standing on a rotating stool spreading his arms.He suddenly contracts his arms.His

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Angular momentum increases

Momentum of inertia increases

Momentum of inertia decreases

Angular momentum decreases

In must practical cases, the cold reservoir is at temperature

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Low temperature

High temperature

Room temperature

None of these

If we have two vectors of magnitude 4 and 5 respectively and between them is 60°, what is magnitude of resultant

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4

8

2

3

When the shear stress and shear strain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The half-life of a certain element is 3.5 days at STP. If the temperature is doubled and pressure is reduced to half then half-life of the same element will be:

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1.75 days

3.5 days

7 days

14 days

Close orbiting satellites orbit the Earth at a height of about

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500 km

400 km

300 km

800 km

A steady current is flowing in a conductor of non-uniform cross-section. Thecharge passing through any cross-section per unit time is

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Directly proportional to the area of cross-section

Inversely proportional to the area of cross-section

Proportional to square of the area of cross-section

Independent of the area of cross-section

Newton's first law of motion is also known as

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Law of motion

Law of mechanics

law of inertia

None of these

A diode as a rectifier converts:

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A)c into D)c

D)c into A)c

Varying D)c current into constant D)c current

High voltage into low voltage and vice-versa

Which of the following pair of quantities do not have the same units?

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Stress, Young's modulus

Strain, bulk modulus

Stress, bulk modulus

None of them

Monochromatic light directly means waves of

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Same frequency

Same color

Same wavelength

All of them

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

An artificial satellite travels in a circular orbit about the Earth. Its rocket engine is then fired and produces a force on the satellite exactly equal and opposite to that exerted by the Earth gravitational field. The satellite would then start to move

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A long a spiral path towards the Earths surface

A long the line joining it to the centre of the Earth (i.e radially)

A long a tangent to the orbit

In a circular orbit with a longer period

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Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

The approximate efficiency of storage battery is

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60%

72%

80%

87%

The valence energy band may be either

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Completely filled

Partially filled

a and b

All of them

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

A thin film is a transparent medium whose thickness with the wavelength of light are

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Not comparable

Comparable

Both

None of these

The unit of Planck's constant h is same as that of

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Energy

Work

Linear momentum

Angular momentum

A spinning cricket ball suffers

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An extra height

An extra velocity

An extra curvature

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

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

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

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2.5 × 10^-5 C

2.4 × 10^-6 C

2.4 × 10^-5 C

2.4 × 10^-6 C

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

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curved line

straight line

either straight or curved

none of them

The work done in an equipotential surface is

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Maximum

Infinite

Zero

None of these

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

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g/2

4g

g/4

2g

Ordinary light has components of vibrations in

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one direction only

two directions

four directions

all directions

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

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both the sphere

Depend on the nature of the material of the sphere

With the help of interferometer, we can find the

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Wavelength

Frequency

Phase

None of these

Which color is not used in the combination of colors for color printing?

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cyan

magenta

green

yellow

An atom in which there is a resultant magnetic field behave like a

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Tiny magnet

Magnetic dipole

No magnet

a and b

Arsenic, antimony and phosphorous are the elements from

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third group

fourth group

fifth group

none of them

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

The direction of velocity is along the direction of

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Motion

Displacement

Velocity

None of these

Fire fighters have a jet attached to the head of their water pipes in order to

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Increase the mass flow per sec

Increase the volume flow per sec

Increase the velocity of water flowing out

Avoid wastage of water

Two bodies of 4 g and 16 g have same kinetic energy.What is the ratio of their momenta?

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1 : 4

1 : 2

2 : 1

4 : 1

In deriving Bernoulli's equation, it is assumed that the fluid is

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Incompressible

Non-viscous

In a steady state

All of these

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

Mathematically the vertical velocity component is

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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

Fight of rocket in the space is an example of

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Newton's first law

Newton's third law

Newton's second law

all of them

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

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A tangent

A tangent envelope

Curved surface

None of these

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

For constructive interference the path difference is

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mλ

(m-1)λ

m²λ

1/2mλ

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

Upper fixed point of the thermometer is marked by using

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Barometer

Hydrometer

Hygrometer

Hypsometer

A gas which strictly obeys the gas laws under all conditions of temperatures and pressure is called:

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Ideal gas

Inert gas

Real gas

None of these

Mathematically, the instantaneous acceleration is represented by

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

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Gravitational force

Centripetal force

Centrifugal force

Resistance

The charged nucleus of an atom itself spins, it's magnetic field

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equals the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of them

In Micheal sons interfrometes apparatus the numbers of mirrors and glas plates are used respectively ara

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2,3

3,2

3,3

2,2

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

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

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

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Energy

Momentum

Angular momentum

Power

Examples of crystalline solids are:

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Copper

Zirconia

NaCI

All of these

Both A and B

If the temperature difference between hot and cold body is greater the heat engine is:

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Not efficient

Less efficient

More efficient

NOne of above

The escape velocity for the surface of moon is

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9.8 km/sec

11 km/sec

2.4 km/sec

2.9 km/sec

The dimensions of velocity are

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[ LT ]

[ LT²]

[ LT^-1]

[ LT^-2]

A cylinder cannot roll on

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A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

Einsteins theory say that gravity

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Follows inverse square law

Donot follow the inverse square law

Very weakly follow inverse square law

None of these

Bernoulli s equation applicable in the case of

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Streamlined flow of compressible fluids

Streamlined flow of incompressible fluids

Turbulent flow of compressible fluids

The law of conservation is important in many sport like

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Diving

Gymnastics

Ice-skating

All of these

The body is in a state equilibrium when it is

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At rest

In motion

In rotation

None of these

The rotational analogue of Newtons second law of motion is

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mr²α

mrα

mrα²

None of these

Capacitor can be charged by transferring

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Negative charge

Positive charge

Both

None them

__________ does not have linear strain

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Water

Copper

Aluminum

Iron

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

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

The displacement-time graph of a particle is as shown below.It indicates that

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The particle starts with a certain velocity,but the motion is retarded and finally the particle stops

The velocity of the particle is constant throughout

The acceleration of the particle is constant throughout

The particle starts with a velocity the motion is accelerated and finally the particle moves with a constant velocity

The discuss used by athletes has a mass of 1 kg, its weight in newtons is

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9.8 N

80 N

98 N

100 N

When temperature increases, frequency of organ pipe:

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Decreases

Remains the same

Increases

Becomes zero

The advantage/advantages of fiber optics than radio wave carriers

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Much wider band width

Capability

Immunity

All of these