Question # 1

Angular acceleration is produced in a body by the physical quantity called

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momentum

vibration

torque

centrifugal force

Viscosity of gas with increase in temperature

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Decreases

Increases

No change

All

The sky appears blue because

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Red light is absorbed

Blue light is scattered the most

Blue light is absorbed

It is its natural color

Einstein predicted the shift of light by sun coming from star towards Earths was the same as during the solar eclipse in 1919 is

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Φ = 1.235 sec of angle

Φ = 1.367 sec of angle

Φ = 1.693 sec of angle

Φ = 1.745 sec of angle

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

Which of the following is more elastic material?

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iron

Aluminum

Wood

Rubber

In torque when the force is kept constant and the moment arm increases, then the torque

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Increases

Decreases

Remains constant

None of these

A ray of light passing from a rarer to a denser medium

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Bends towards normal

Bends away from normal

Suffers no change in direction

None of these

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

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

Two light sources obtained from single source are called

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non-coherent sources

coherent sources

monochromatic sources

spherical sources

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

The property of light which does not change with the nature of the medium is

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Frequency

Amplitude

Wavelength

None of these

Two equal an opposite forces acting along the same line of action will result in

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translational equilibrium only

rotational equilibrium only

translational as well as rotational equilibrium

neither translational nor rotational equilibrium

If r = 1.0 × 10^-4 m ρ = 1000 kgms^-3 η = 19 × 10^-6 kgm^-1 s^-1 find V_t terminal velocity

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1.02 × 10^-3 ms^-1

0.12 × 10^-3 ms^-1

1.1 ms^-1

1.21 ms^-1

If stress is increased beyond the elastic limit and change in solid is permanent this behaviour is called

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Elasticity

Plasticity

Conductivity

Insulator

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

In an interference pattern of Young,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 equally spaced

Central fringes are wider than the outer fringes

A man pushes a wall and fails to displace it. He does

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Negative work

Positive work but not maximum work

No work at all

Maximum positive work

If there were no intermolecular forces between gas molecules, the pressure due to a given sample a gas will be

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Increased

Decreased

Unchanged

None of these

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

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constant

increasing

decreasing

none of them

If drag force is given by F = krv what could be the SI units of k

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kgm²s^-1

kgm^-2s^-2

kgm^-1s^-1

kgms^-1

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

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800 Hz

600 Hz

400 Hz

200 Hz

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

Energy can be obtained form solid waste by

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Direct combustion

Indirect combustion

Permentation

None of these

Is there any physical distinction between the valence and conduction band

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Yes

No

Very small

None of these

In order to observe interference , the interfering beams must be

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monochromatic

coherent

either of them

both of them

Torque is zero if

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Moment arm is zero

Body is at rest

Uniform angular acceleration

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

The refractive index of a medium is defined as a ratio

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Internal friction of fluid is

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Resistance

Viscosity

Cohesive force

Surface tension

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

A highly irreversible process is

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Expansion

Explosion

Compression

None of these

The original source of biomass energy is

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Moon

Sun

Geothermal

None of these

Bouncing off the squash ball several times from wall bears no

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Total displacement

Average velocity

Both

None of these

Which of the fluid has ideal behavior at low speeds

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Air

Blood

Honey

None of these

The object is placed at the principle focus of a simple microscope if the focal length of the lens is 2cm what is the magnifying power of the microscope

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13.5

12.5

Infinity

None of these

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

Arsenic, antimony and phosphorous are the elements from

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third group

fourth group

fifth group

none of them

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

The energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

The unit of coefficient of viscosity is

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kgm^-1s^-1

Nsm^-2

Poise

All of these

Displacement is a physical quantity, which is a

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Scalar

Vector

Variable quality

None of these

The approximate efficiency of silicon solar cell is

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5 - 10%

9 - 12%

12 - 16%

15 - 18%

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 modulus of rigidity of a liquid is

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Zero

1

Infinite

None of these

For atomic nucleus, the binding energy per nucleon with increase in mass number:

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Increases continuously

Remains same

Decrease continuously

First increases and then decreases with increase in mass number

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decrease

In Newton s rings the central spot appears dark due to

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Phase change

Destructive interference

Small eye piece of optical device

Both a and b

The force between two charges in 8 N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

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2 N

4 N

6 N

8 N

The Dimension of length is

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[L]⁰

[L]^-1

[L]

None of these

The energy stored in a wound watch spring is

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K.E

P.E

Heat energy

Chemical energy

A body is in complete equilibrium when

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ΣF = 0

Στ = 0

SF = 0 and Στ = 0

None of these

Bulk modulus is involved when the deformation is:

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One dimentional

Two dimentional

Three dimentional

Any of these

None of these

The sink in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

The right hand rule is applied to find

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The direction of a vector obtained by the vector product of two vectors

The magnitude of the vector obtained in the above manner

Neither the direction nor the magnitude

None of these

Real gases strictly obey gas laws at:

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High pressures and low temperatures

Low pressures and high temperatures

High pressures and & temperatures

None of these

Which of the following properties show light is transverse wave in nature?

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Interference

Reflection

Diffraction

Polarization

The direction of velocity is along the direction of

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Motion

Displacement

Velocity

None of these

Let a ray of light enters from air into two media of different refractive indices. The speed of light will be ______ to refractive index

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Directly proportional

Inversely proportional

Sometimes inversely

Equal

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

The ultimate tensile strength is

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Greatest stress, a material can endure

Stress is increased beyond the yield strength

Maximum stress, a material can with stand

None of these

1 torr is expressed as

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136.5 Nm^-2

13.3 Nm^-2

133.3 Nm^-2

130.5 Nm^-2

The capacity of two way telephone circuits of INTESAT VI satellite is circuits

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10, 000

20,000

30,000

40,000

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

A change in position of a body from its initial position to its final position is known as

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relative motion

displacement

distance

acceleration

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

The different parts of spectrometer

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Collimator

Turn table

Telescope

All of these

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

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

The correct unit of Kinematic viscosity in SI system is

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ra(D) s^-2

m².s^-1

g.s^-2

N .sm^-2

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

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

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Positive

Negative

Zero

None of these

For the monochromatic beam of X-rays, the crystal planes in a lattice act like a

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perfect absorbers

boundary

mirror

none of them

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

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electric field

magnetic field

either of them

both of them

Polythene,polystyrene and nylon are example of

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Polymeric solids

Crystalline solids

Glassy solids

Inkjet printer can produce

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Black and white copy

Coloured copy

Both

None of these

Thermal radiations are a type of:

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Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

The danger signals are red while the eye is more sensitive to yellow because

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Scattering in yellow colour is less than that of red

Red light is longer in wavelength than yellow light

Scattering in red is less than that of in yellow

Red colour has greater frequency than yellow light

A stress which is along one dimension is known as:

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Tensile stress

Linear stress

Compressive stress

Both (A) and (C)

Both (A) and (B)

The SI unit of strain is

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N

dynes

pascal

dimensionless

The waves produced in a stretched string are called

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Stationary waves

Mechanical waves

Transverse mechanical waves

None 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 atoms molecules or ions in a crystalline solids are at room temperature

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Motionless

Vibrate violently

Fixed

Simply vibrate

In launch mass of the rocket fuel is

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70%

80%

More than 80%

None of these

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

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22 m

6 m

33 m

7.8 m

Shear modulus for mercury is

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0

12

27

42

A collision in which the K.E. is not conserved is called

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Elastic collision

Inelastic collisiion

Both

None of these

Electromagnetic waves transport:

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Energy only

Momentum

Both A and B are correct

None is correct

Which of the following cannot have an effect on the weight of an object?

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The distance of the object from a planet

The acceleration of the object

The placement of the object on a different planet

The mass of the object

The electric field due to an infinitely long thin wire at a distance R varies as

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1/R

1/R²

R

R²

Bulk modulus for diamond is

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250

540

695

714

The minimum number of lenses used in compound microscope is

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1

2

3

4

To observe diffraction phenomenon the size of a obstacle

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Should be much larger than the wavelength

Should be of the same order as the wavelength

Have no relation of wavelength

Should be exactly λ/2

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

When a horse pulls a cart the force that helps the horse to move forward is the force exerted by

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The cart on the horse

The ground on the horse

The ground on the cart

The horse on the ground

A stethoscope detects the instant at which the external pressure is

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Greater than systolic pressure

Equal to systolic pressure

Lower than systolic pressure

None of these

An oil film floating on water surface show colours due to

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Interference

Diffraction

Scattering

Reflection

A beam of light of wavelength is incident normally on a grating of element d the angle between the zero-order and first -order spectra depends on

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λ only

d only

λ and d

λ d and distance of screen from the grating

A force passing through the centre of gravity of a body

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Causes translation motion

Causes rotational motion

Produces no motion in the body

Produces both translational and rotational motion

The nonrenewable energy source is

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Sunlight

Hydroelectric

Uranium

None of these

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

At the point of contact of the lens and the glass plate, the incident and reflected rays interfere

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constructively

destructively

either of them

none of them

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

The siemens is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

In Michelsion's interoferometer, if the moveable mirror is moved through a distance 0.05 mm and 500 finges are observed, then the wavelength of light used is

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1 x 10^-7m

2 x 10^-7m

1.5 x 10^-7m

1 x 10^-8m

A device which is based upon the thermodynamic property of matter is

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Thermometer

Thermo state

Heat engine

Calorimeter

In YDS experiment, condition for constructive interference is that path difference is equal to

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nλ

mλ

(n + 1/2)λ

(m + 1/2)λ

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

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

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

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cm

cm²

cm^-1

cm^-2

The internal energy is similar to the

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Gravitational potential energy

Kinetic energy

Mechanical energy

None of these

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

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

Moment of inertia of thin rod is

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1/2 mL²

1/6 mL²

1/12 mL²

1/15 mL²

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

In Toricelli's theorem, the speed of efflux is equal to

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h₁ - h₂

Action of gravity

(h₁ - h₂) and falling under gravity

None of these

Angular momentum is conserved under

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Central force

Constant force

Variable force

Uniform force

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both A and B

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 characteristics of steady flow is

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Non-viscous

Incompressible

Streamline

All of these

Which of the following theory completely explain the three types of materials?

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

In petrol engine, the fourth stroke is the

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Power

Compression

Exhaust

None of these

Such substances which break soon after they cross elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

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

Negative and positive charge in a hollow sphere are equal in the number then flux from the surface will be

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Zero

Positive

Negative

Flux will be both negative and positive

Torque is a

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Scalar quantity

Vector quantity

Physical quantity

None of these

The work done by the gas during the isobaric expansion is equal to

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Area of rectangle

Area of triangle

Area of parallelogram

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

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

A negative sign is assigned to quantities where direction is opposite to that of

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final velocity

initial velocity

instantaneous velocity

all of them

The unit of inductance is equivalent to

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∨xs/A

∨xA/s

∨ x s/v

∨/A x s

Capacitor can be charged by transferring

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Negative charge

Positive charge

Both

None them

Slope of velocity time graph is

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Speed

Work

Power

Acceleration

If a source of light is moving away from stationary observer then frequency of light wave appears to change because of

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Doppler's effect

Interference

Diffraction

None of the above

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

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Far point

Near point

Distant point None of these

Femto means

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10^-15

10^-18

10^-2

10^-12

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

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Monochromatic

Phase coherence

Coherent sources

All of these

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

The distance from Earth to Sun is

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10⁹ m

10⁸ m

10¹⁰ m

10¹¹ m

The dimensional formula of light year is

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LT^-1

T

ML²T^-2

L

Viscus force depends upon

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Coefficient of viscosity

Velocity of objects

Radius of object

All of these

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 resolving power of a grating spectrometer is

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Two row boats moving parallel in the same direction and pulled toward each other due to the application of Bernoulli's equation

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Stake's theorem

Toricelli's theorem

Venturi relation

None of these

Deceleration means the speed of the body is

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Increasing

Decreasing

Just moving

None of these

Material with smaller hystersis loop area are best for the construction of

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Transformer

Core of transformer

D.C motor

Rectifier

The ballistic missiles are useful only for

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long ranges

short ranges

medium ranges

none of them

The example of nuclear fusion is:

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Formation of barium and krypton from uranium

Formation of plutonium -235 from uranium -235

Formation of helium from hydrogen

Formation of water from hydrogen and oxygen

If a gymnast sitting on a rotating table with his arms out stretched suddenly lowers his hands

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The angular velocity decreases

The moment of inertia decreases

The angular velocity remains constant

The angular momentum increases

The more viscous liquids is

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Coal tar

Honey

Kerosene oil

Water

Substances which flow easily are

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Water

Kerosene oil

Petrol

All of these

Study of fluid properties in motion is

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Dynamics

Fluid statics

Fluid dynamics

None

The dimensions of expression V_f = V_i + at. Taking the R.H.S

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[LT]

[LT²]

[LT^-1]

[LT^-2]

The maximum energy of the photoelectrons can be determined by making the:

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

Torque acting on a body determines its

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inertia

linear acceleration

angular acceleration

angular velocity

A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by

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0.75 mm

1.5 mm

3.0 mm

6.0 mm

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

According to the law of conversion of linear momentum, the total linear momentum of an isolated system

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increases

decreases with time

remains constant

none of them

The number of significant figures in 5850 is

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3

4

5

2

Selenium is an

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Insulator

Conductor

Semiconductor

Photo conductor

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

In YDS experiment, at the center of screen is formed a:

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Dark fringe

Bright fringe

No fringe at all

None of these

The typical speed of 100 meters dash

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2 ms^-1

4 ms^-1

10 ms^-1

12 ms^-1

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

The Bernoulli's equation often expressed in

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If both the length and radius of the wire are doubled,how does the modulus of elasticity change?

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Becomes one fourth

Halved

Doubled

Remains unchanged

The speed of secondary wavelets as mentioned in Huygen's principle is______the speed of propagation of the wave itself:

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Equal to

Greater than

Smaller than

None of these

Where the intensity of gravitational field of earth is maximum

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Center of earth

Equator

Poles

Same every where

The ideal gas obey gas law at:

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Low tempratures and high pressures

High temperatures and low pressures

All temperatures and pressures

None of these

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light?

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No change

Diffraction bands become narrower and crowded together

Bands become broader and farther apart

Bands disappear

If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

Inspite vibrations the force which hold the atoms in their ordered form is

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Vander vall force

Cohesive force

Adhesive force

None of these

Shear modulus for lead is

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1.7

4.9

5.6

6.2

A telescope is rotatable about the same vertical axis as the turntable, with a scale which is

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Main scale

Vernier scale

Half degree scale

None of these

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

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Force per unit volume

Energy per unit area

mass per unit volume

None of these

The particles equal in mass or greater than mass of protons are called:

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Leptons

Mesons

Baryons

Quarks

The direction of torque is

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The same as the direction of the corresponding applied force

Opposite to the direction of the applied force

Perpendicular to the direction of the applied force

Parallel to applied force

The fusion of hydrogen into helium is more likely to take place:

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At high temperature and high pressure

At high temperature and low pressure

At low temperature and low pressure

At low temperature and high pressure

Which of the following colors will have minimum critical angle when light passes from glass to air

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Red

Blue

yellow

Orange

Single mode step index fibre has

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Thick core and large cladding

Thick core and shorter cladding

Thin core and shorter cladding

Thin core and larger cladding

Distance covered by a freely falling body in one second is

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9.8m

4.9m

2.7m

3.9m

The temperature at which all the gases become liquid is called:

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273 K

-273 K

Absolute Zero

Both (B) and (C)

How is the interference pattern in Young's double slit experiment affected if the sodium light is replaced by red light of the same intensity

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The fringes will vanish

The fringes will become brighter

The fringes will increase

The fringes will decrease

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

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Spontaneously

When it is put in a reactor

When it is heated

Under pressure

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

In rotational motion, the analogue of force is

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Rotational inertia

Moment of inertia

Torque

Mass

At high altitude the blood flows out of nose and ear because

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The blood pressure increases at high altitudes

The percentage of oxygen in the air increases

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

Two lenses of power +12 and -2 diopters are placed in contact the power of combination is

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10 diopters

8 diopters

6 diopters

12 diopters

The typical speed of has working aunt is

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0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

The binding energy per nucleon is:

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Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

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

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

A force of 50 dynes is acted on a body of mass 5 g which is at rest.for and interval of 3 seconds,then impulse is

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0.15 x 10^-3 Ns

0.98 x 10^-3 Ns

1.5 x 10^-3 Ns

2.5 x 10^-3 Ns

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

Can a vector have a component greater than the vectors magnitude ?

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yes

No

yes in some cases

None of these

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

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

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Zero

90^o

180^o

None of these