Question # 1

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

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Frequency and wavelength decreases

Frequency increases and wavelength decreases

Frequency stays same, wavelength increases

Frequency stays the same, wavelength decreases

A unit set is the smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

The metals become a magnetic material because of their

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Hardness

Alignment of atoms

Structure

All of them

Under what circumstance would a vector have components that are equal in magnitude ?

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45^o , 145^o , 245^o

135^o , 225^o

45^o , 135^o , 225^o and 315^o

None of these

The magnitude of displacement is

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Distance between two points

Distance in a curved path

Shortest distance between two points

None of these

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

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

The ratio of stress/strain is called as

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Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

The SI units of momentum is

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Kg m s^-2

Kg ms

Kg m s²

Ns

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

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All expect A

Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'η' with a velocity 'v'. The retarding viscous force acting on the spherical ball is

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Inversely proportional to both r and v

Directly proportional to both r and v

Directly proportional to r but inversely proportional to v

Inversely proportional to r but directly proportional to v

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

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increase

Remains constant

First increases and then decreases

An instrument called a sphygmomanometer measure

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Density of water

Blood pressure

Milk density

None of these

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The blood pressure of about 120 torr is called the

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Diastolic pressure

Systolic pressure

Minimum diastolic pressure

Dangerous blood pressure

When body is connected to earth then electrons from the earth flow into the body. It means that the body is

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Uncharged

An insulator

Positively charged

Negatively charged

Is there any physical distinction between the valence and conduction band

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Yes

No

Very small

None of these

A man pushes a wall but falls to displace it.He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

Bulk modulus for ice is

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5

6

7

8

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

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1 cm/s

1 mm/s

1 nm/s

1 μm/s

Value of solar constant is

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1 kw/m²

1.4 kw/m²

1.4 w/m²

1 w/m²

The velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

In place of spark plug, the diesel engine requires also

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High speed air

High temperature air

Low temperature air

None of these

An automobile moves with constant speed along a circle of radius 40 m. It takes 2 μ second to complete one circle,The average speed for one complete circle is

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20 ms^-1

40 ms^-1

60 ms^-1

0 ms^-1

Period of vibration of an atom in a solid is

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1 × 10^-10 sec

_{1 × 10}^-13_sec

1 × 10^-16 sec

1 × 10^-19 sec

One year is equal to

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4.3 × 10¹⁰ sec

4.4 × 10⁸ sec

3.12 × 10⁷ sec

3.2 × 10⁶ sec

Chimney works best when it is

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Tall

Short

Of any shape

Insufficient statement

Total number of base units are

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three

five

seven

nine

A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage gain is ………

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100,000

100

1000

101

The dimensions [MLT^-1] refers to the quantity

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Momentum

Angular frequency

Angular displacement

Angular acceleration

A particle moves along a circular path under the action of a force.The work done by the force is

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Zero

Positive and non zero

Negative and non zero

None of above

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

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Smaller

Longer

Equal

None of these

The drag force increases as the speed of the object

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Decreases

Increases

Decreases rapidly

None of these

The property due to which the size or shape of a lattice is not important is called

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Cleavage

Anisotropy

Homogenity

None of these

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by putting

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V_f= 0

Simple 'a'

a by g

None of these

In carnot cycle, there are adiabats

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One

Two

Three

Four

A charge is situated at the centre of cube. The electric flux through one of the faces of the cube is

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Q/∈_o

Q/2∈_o

Q/4∈_o

Q/6∈_o

The dimensional formula of angular velocity is:

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M^°L^°T^-1

MLT^-1

M^°L^°T^-1

The SI unit of momentum is

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Kgms^-1

Kgms^-2

NS

A and C

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle.the motion of the particle takes place in a horizontal plane.It follows

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Linear momentum is constant

Velocity is constant

It moves in a circular path

None of these

Uniform electric field can be mapped with electric field lines which are

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Parallel

Equally spaced

Parallel and equally spaced

None

Acceleration increases ______ when rain drop starts to fall

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Very fast

Gradually

Very slow

No increase

Torque is a turning effect of a

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Body

Momentum

Force

None of these

Fahrenheit and centigrade (Celsius) thermometers have the same reading at

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-100°C

60°C

40°C

-40°C

Newtons second law gives the measures of

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Acceleration

Force

Momentum

Angular momentum

The vertical velocity component changes with

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Distance

Time

Height

Angle

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

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

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Unit cell

Lattice plane

Crystal

None of these

A body 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

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

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Refraction

Interference

Diffraction

Reflection

In thin film colours are due to

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Reflection

Interference

Diffraction

Refraction

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

The escape velocity of Mars in Kms^-1

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2.89

3.99

5.00

5.23

An ideal heat engine can only be 100% efficient if its exhaust temperature is equal to

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0°C

0k

100°C

Temperature of source

When a meteorite enters into earth atmosphere its energy converts into

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Kinetic energy

Heat energy

Mechanical energy

None of these

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

Position vector is a vector, which describes the

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Location of a point with respect to origin

Location of point with respect to any point

Location of a point with respect to some related point

None of these

The magnifying power of a compound microscope can be increased if we use objective lens of

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Large focal length

Small focal length

Same focal length

None of these

If d = 0.25 cm Y = 0.059 cm L = 100 cm m = 2 then λ is equal to

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567 nm

569 nm

590 nm

596 nm

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

The food which we eat in three days produces energy equal to energy from ____ liter of petrol

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1

1/3

3

9

The bending of light when it passes from one medium to another is known as

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Refraction

Interference

Polarization

Diffraction

In n-type substances the minority carriers are

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Holes

Electrons

Neutrons

None

For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium

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Greater, rarer, denser

Smaller, rarer, denser

Smaller, denser, rarer

Greater, denser, rarer

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

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Space time

Straight space time

Curved space time

All of these

The typical speed of human swimming is

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1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

Velocity is a physical quantity which is

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Scalar quantity

Vector quantity

Variable quantity

None of these

When the velocity of a body is increasing, the acceleration produced is

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No acceleration produced

Negative acceleration

Positive acceleration

None of these

The technological uses of superconductors are

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MRI

Magnetic levitation trains

Faster computer chips

All of them

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The electrical resistance of mercury disappeared below temeprature

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2.1 K

3.4 K

4.1 K

4.2 K

Strain is defined in terms of:

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Formation

Deformation

Area

Newtons

None of these

The unit of inductance is equivalent to

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∨xs/A

∨xA/s

∨ x s/v

∨/A x s

The length of the standard metre measured by Michelsion's interferometer comes out to be

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1,553, 163.5 wavelength

1553.5 wavelength

155316.5 wavelength

none of them

A visual representation of an electric field in terms of an electric field lines was proposed by

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Coulomb

Faraday

Gauss

Lenz

The burnt gas expelled from the rocket engine with

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High velocity

Extremely high velocity

Very high velocity

None of these

On a rainy day if there is an oil drop on tar road colored rings are seen around this drop This is because of

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Interference pattern produced due to thin oil film

Diffraction pattern

Polarization

Total internal reflection of light

Elastic deformation of a material is the deformation which is

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Permanent

Temporary

Some what permanent

None of these

In case of uniform circular motion which of the following physical quantity do not remain constant?

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Speed

Momentum

Kinetic energy

Mass

In an inelastic collision

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Both K.E and momentum are conserved

Both K.E and momentum are not conserved

Momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

Torque = Force x ?

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Speed

Momentum

Moment arm

Couple arm

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

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120 x 10.8 N

180 N

720 N

360 N

A pendulum bob is suspended inside a lift moving upward with constant velocity.If mass of the bob is 50 g then its weight inside the compartment is

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Zero

0.1 N

0.5 N

0.05 N

Equal vectors are said to be equal if by have

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Same magnitude and direction

Same magnitude and opposite

No position of initial points

Direction a and b

The original source of Wind energy is

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Tides

Waves

Sun

Moon

The product of resistance and conductance of a resistors is equal to:

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1

Conductivity

Resistivity

Zero

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 maximum wavelength of a transverse wave that can be set up in a string of length Lis

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L

2L

V

4L

A semi conductor in its extremely pure from is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

The weight of the body at the centre of the earth is.

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Infinite

Zero

Slightly less than that at the equator

Slightly more than that at the equator

The relation for impulse can be written as

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F x t = mV_i- mV_f

F x t = mV

F x t = mV_f- mV_i

None of these

In a semiconductor,the mobility of holes is

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Greater then electrons

Less than electrons

Equal to electrons

None

Solid state Physics is the branch of physics deals with the

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Atoms and molecules

Structure

Properties

b and c

Number of spark plugs needed in diesel engine is:

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Four

Five

Six

None of these

The highest efficiency of a heat engine whose lower temperature is 17°C and the high temperature of 200°C is

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70%

100%

35%

38%

In the formula for velocity of efflux v = √2gh, h is the

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Height of liquid column from bottom of vessel

Height of orifice from the bottom of the vessel

Height of liquid column above the orifice

Height of the vessel

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

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

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1 : K

K : 1

1 : K²

K² : 1

The Bernoulli's equation often expressed in

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The time taken by the light to travel from Pluto to Earth is

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4 hrs 20 sec

5 hrs 20 sec

6 hrs 20 sec

76 hrs 20 sec

The ability of a body to return to its original shape when applied force is removed is called

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Stress

Strain

Elasticity

All of them

Steam engine is:

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An optical system

A thermal system

A thermodynamic system

None of these

Bulk modulus for tungsten is

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50

100

150

200

All possible process/processes to get plane polarized light

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Reflection from different surfaces

Refraction through crystals

Scattering by small particles

All of these

In semiconductor Si or Ge a missing electron in covalent bond from an atom is a

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Charged atom

Hole

Ion

All of them

Amorphous solids are more like

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crystalline solids

polymeric solids

glassy solids

any one of them

Gaussian surface may be

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Spherical

Rectangular

Any shape

None of these

Crystalline solid do not show

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Sharp melting points

Flat faces

Long range order

Isotropic expansion coefficients

Ordinary light has components of vibrations in all possible planes. Such light is

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Unpolarized light

Polarized light

Both

None of these

Can the resultant of 2 vectors be 0?

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Yes when the 2 vectors are same in magnitude and direction

No

Yes when the 2 vectors are same in magnitude but opposite in sense

Yes when the 2 vectors are same in magnitude making an angle of 2π/3 with each other.

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

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Critical frequency

Threshold frequency

Maximum frequency

Minimum frequency

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both A and B

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

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Force acts on it

Torque acts on it

Frictional force action it

None of these

If the angle between r and F is 90°, then the torque is

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zero

minimum

maximum

infinite

Truth of kinetic energy theory is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

Large CR (Time constant) value has

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Small time constant

Large time constant

Equal time constant

None of these

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

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W

I

R

M

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives rise to an effect called:

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Diffraction

Interference

Polarization

Dispersion

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

Dielectric has the charge of the type inside it

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Moving charge

Static charge

Both a & b

None of these

The time of flight of a projectile motion equals to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

Bending of light around sharp edges is known as

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Interference

Diffraction

Reflection

Dispersion

Which one is least multiple?

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exa

femto

atto

nano

The light produced by a laser is all the following except

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Incoherent

Monochromatic

In the form of a narrow beam

Electromagnetic

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

A particle is moving in a vertical circle.The tensions the string when passing through two positions at angles 30° and 60° from vertical (lowest positions) are T₁ and T₂ respectively.Then

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T₁ = T₂

T₂ > T₁

T₁ > T₂

Tension in the string always remains the same

A two-slit arrangement is set up to produce an interference pattern on a screen. The fringes are too close together for convenient observation. How could the distance between them be increased?

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by using a light of longer wavelength

by increasing the width of the slits

by decreasing the distance between the screen and slits

the distance between the fringes is impossible

The quantity of motion of the body is called

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Force

Acceleration

Momentum

None of these

When R^x is negative and R^y is positive, the resultant lies in the second quadrant and its direction is

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θ = 90 + Φ

θ = 180 - Φ

θ = 180 + Φ

None of these

The rate at which the battery is supplying the electrical energy is the:

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Power output

Electrical power

Power input

Both A and C

In super conductors, once the current is established it exists

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1 day

30 days

indefinitely

None of these

Which of the following is not true for a crystalline substance

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Shorter range order

Isotropic electrical conductivity

Flat surface

Sharp melting point

Where in standing wave, do the vibrations of the medium occur?

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Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

The work done by the system on its environment is considered

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Natural

Positive

Negative

None of these

Pascal is a unit of

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Mass

Power

Pressure

Intensity of light

Torque acting on a particle with respect to origin is given by

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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

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

Approximate power of a pocket calculator in watts

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7.5 × 10²

7.5 × 10^-2

7.5 × 10^-4

7.5 × 10^-5

When the velocity of the car is constant. The velocity time graph is a

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Straight line

Straight line rises the same height for equal intervals of tome

Horizontal straight line

None of these

The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

A jet engine works on the principle of

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Conservation of linear momentum

Conservation of mass

Conservation of energy

Conservation of angular momentum

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

Shear modulus for brass is

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36

39

51

65

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

If the distance between two masses is doubled, the gravitational attraction between them

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Is doubled

Becomes four times

Is reduced to half

Is reduced to a quarter

If the focal length of the eye piece 25.0 mm find its magnification

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12.0

14.0

- 11.0

- 13.0

The relation for the adiabatic change is

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PV = Constant

PV²= Constant

PV^r= Constant

PV^-r= Constant

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

Solar energy at normal incidence outsides the Earth atmosphere is about

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1.043 Wm^-2

1.2 Wm^-2

1.4 Wm^-2

1.67 Wm^-2

The entity which measures the quantity of motion in a body is called

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force

energy

momentum

power

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 substance, which exists in two or more crystal forms under different conditions is called:

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Isomorphism Substance

Allotropic substances

True substances

Polymorphous substances

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

The distance between the two adjacent slits is called

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Thickness of the slit

Distance between and two slits

Grating element

None of these

The total change in momentum of the isolated two ball system is

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Maximum

Minimum

Zero

None of these

How are X-rays diffracted by crystals in X-rays crystallography?

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they bounce off the nucleus

they are diffracted whey they pass from between them acting as a slit

they are diffracted by the electron clouds in the atoms

they hit the side the nucleus and change direction and thus are diffracted

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

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Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

Motion of rocket is based upon

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Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

The direct conversion of sunlight into electricity through the use of semi conductor devices called

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Photo cell

Photo voltaic cell

Semiconductor diode

None of these

Heat rollers make the copy

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Heated

Tone melted

Dry

All of them

When we consider the average velocity of a body, then the body is moving in

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straight line

curved line

may be in a straight or curved path

none of them

The equation of continuity of fluid is based on the

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Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

All of these

If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look

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Dark

Bright

Sometimes bright and dark

None of these

Which of the following substances possesses the highest elasticity?

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Al

Copper

Steel

Rubber

Length can not be measured by

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Fermi

Debye

Micron

Light year

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width:

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

Sadi Carnot described an ideal engine using only isothermal and adiabatic process in

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1820

1825

1837

1840

Which of the following is conservative field

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Electrostatic field

Frictional field

Viscous field

All of these

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

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

The deformation measured in terms of some twisting angle due to action of stress is known as

Choose an answer

Stress

Linear stress

Compressive stress

Shear stress

Approximate power of colour T.V. in watt is

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90

100

130

120

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

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Increase its speed

Decrease its momentum

Change its direction

Keep it moving with the same speed

Magnetic permeability is maximum for

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Dia-magnetic

Ferromagnetic

Paramagnetic

Non-magnetic

1 revolution is equal to

Choose an answer

2π radian

360^o

Both

None of these

Which of the following cannot be polarized?

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x-rays

light rays

sound waves

ultraviolet rays

At the top of the trajectory of a projectile,the acceleration is

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The maximum

The minimum

Zero

g

The numerical values of the ratio of displacement to the distance is

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Always less than one

Always equal to one

Always more than one

Equal to or less than one

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

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

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5 N

50 N

500 N

zero

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

The fluid which is incompressible and have streamline flow is called _________ fluid

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Ideal

Viscous

Non ideal

None of these

If a wire is stretched to double of its length then the strain will be

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1

0.5

2

0

When the light is incident on polarizing angle which of the following is completely polarized?

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Reflected light

Refracted light

Both reflected and refracted light

Neither reflected nor refracted light

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

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Elastic collision

Inelastic collision

Both

None of these

Angular displacement generally expressed in

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Degrees

Revolution

Radian

All of these

When m₂>> m₁and V_{2 = 0 then result of their velocities}

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V₂= 0 and V₁= V'₁

V'₁= -V₁and V'₂= 0

V₁= V₁and V₂= 0

None of these

Is it possible to add a vector quantity to a scalar quantity ?

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No

Yes

Never

None of these

The optical fibre has a layer over the central layer is called cladding of refractive index

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High

Low

Very high

None of these

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

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

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

Each domain contains the atoms of range of

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10^-10 to 10¹⁸

10¹⁰ to 10¹⁶

10¹² to 10¹⁷

10¹² to 10¹⁶

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 flowing liquid possesses

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K.E

P.E

Pressure Energy

All