Question # 1

When the fluid is incompressible, for which the density is

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Constant

Change

Both

None of these

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polystrene

None of these

The power loss can also take place due to

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Information received can be inaccurate due to dispersion

Light signal may not be perfectly monochromatic

Signal accuracy may be affected by deflective source

All of these

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

When satellite is moving in a circle, it has an aceleration

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mV²/r

ωr/V

V²/r

ωV/r

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

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

Mathematically the instantaneous velocity is defined as

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The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

Polymers are the physical combinations of carbon with:

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Oxygen only

Hydrogen

Nitrogen

All of these

None of these

Gaussian surface may be

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Spherical

Rectangular

Any shape

None of these

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

At the point of contact of the lens and the glass plate, the Newton's ring is

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dark

bright

either of them

neither of them

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

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

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one particular

just one

May be another

None of these

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

The number of seconds in one year are

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3.154 x 10⁶

3.154 x 10⁵

3.154 x 10⁴

3.154 x 10⁷

When an atom is surrounded by large number of atoms their the energy levels are

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Distinct

Very close

Energy band

None of these

The mass of the object is a quantitative measure of its

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speed

velocity

acceleration

Inertia

Two charges are placed a certain distance apart in air. When a metallic sheet is placed between them the electric static force between them will

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Decrease

Increase

Remains unchanged

Become zero

Why is the weight of an object approximately the same at all points on the earth?

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the gravitational field is uniform

equal force is exerted on the object at points equidistant from the centre

weight is unaltered by attitude

weight of an object varies with its distance from earth

The idea that all magnetic effects may be due to circulating currents (i.e moving charges) Was first held by

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Ampere

Faraday

Lenz

Gauss

Common methods used for the conversion of biomass into fuels are

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Fermentation

In direct combustion

Direct combustion

None of these

On applying a stress of 20 x 10⁸Nm^-2, the length of perfectly elastic wire is doubled. Its young' modulus is

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40 x 10⁸N/m²

20 x 10⁸N/m²

10 x 10⁸N/m²

5 x 10⁸N/m²

The period of a satellite when there is critical velocity is

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80 min approx

84 min approx

82 min approx

90 mix approx

As the droplet accelerates, the upward drag force on it

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Increases

Decreases

Suspended

None of these

A device which convert DC into AC is calleD)

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Invertor

Generator

Rectifier

Motor

The SI unit gravitational potential is

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Joule/Kg

Kg/joule

Joulex/Kg

Monochromatic light directly means waves of

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Same frequency

Same color

Same wavelength

All of them

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

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No

Yes

Never

None of these

Truth of kinetic energy theory is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

Remanance or Retentivity is the phenomenon in which the material still remains strongly magnetized when curve is

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Increase to maximum

Reduce to minimum

Reduce to zero

None of these

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

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Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

For a fixed force, larger is the mass of a body, the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Crystalline solids are also

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Metals

Ionic compound

Ceramics

All of them

The original source of hydroelectric is

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Water

Wind

Sun

Moon

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

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couple arm

angular distance

moment arm

none of them

If the vibrations of the light wave are confined to one plane only, then this light is called

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unpolarized ligth

polarized light

sunlight

none of them

When a bicycle is in motion the frictional forces exerted by the ground are:

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In the forward direction on both the wheels

In the backwards direction on both the wheels

In the forward direction on the front wheel and the backward direction on the rear wheel

In the backward direction on the front wheel and the forward direction on the rear wheel.

In YDS experiment using white light

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Colored fringes will be obtained

No fringes will be observed

Alternative bright and dark fringes will be seen

None of these

A unit vector may be defined by the

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Surface

Direction by normal drawn vector

Along the direction of surface

a and b

The ratio of shearing stress/shearing strain is called as

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modulus

Pascal modulus

Hooke's modulus

shear modulus

The terms phase difference and path difference are:

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Same

Different

Equal

None of these

For a freely falling elevator everything in it

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Will have maximum weight

Will have minimum weight

Will be weightless

None of these

The energy associated with an electron of velocity 10⁶ m/s is:

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4.5 x 10^-10 J

4.5 x 10^-19 J

3 x 10^-10 J

3 x 10^-19 J

polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

Which of the given pair have same dimension

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Stress, pressure

Elastic modules, pressure

Stress, elastic modules

All have same dimension

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentun

Capacitor is a device use to store the

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A.C. current

D.C. current

Charge

Voltage

Inverse square law for luminance is valid for

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Search light

Isotropic point source

Cylindrical source

All types of sources

Time between the normal heart beats is

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8 × 10^-1 sec

_{8 × 10}^-2_sec

8 × 10^-3 sec

None of these

The torque acting upon a system is zero Which of the following will be conserved

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Linear momentum

Angular momentum

Moment of inertia

Angular velocity

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

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

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F_D = 6ηrv_t

F_D = 6πηrv_t²

FD = 6πηr²v_t

FD = 6πηrv_t

The wave propagates in space by the motion of the

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Particles

Wavefronts

Wavelength

None of these

Amorphous materials have the properties of solids like

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No structure

Like liquid

Glassy

a and c

In which of the optical fibres, the propagation of light signal is through continuous refraction?

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multi-mode step index fibre

multi-mode graded index fibre

both of them

none of them

Alexander graham bell transmits a voice message via a

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Beam of light

Telescope

Compound microscope

Mirror

The wave nature of light was first proposed by

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Huygen

Thomas Young

Newton

Compton

The only significant motion possessed by the mono-atomic gas molecules is:

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Translatory

Rotatory

Vibratory

None of these

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

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Elasticity

Stress

Strain

Shear

Resolving power of a telescope depends on:

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The magnification of eyepiece

The focal length of objective lens

Diameter of objective lens

Refractive index of objective lens

Spectrum of sun consists of

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Bright lines

Dark lines

Bright bands

Dark bands

The cross product of two perpendicular vectors has magnitude

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Maximum value

Minimum value

Zero

None of these

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

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diffraction

interference

polarization

reflection

The K.E.of a light and a heavy object is same.Which object has maximum momentum?

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Light object

Heavy object

Both have the same momentum

Data is not sufficient

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

The escape velocity of moon in Kms^-1 is

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1.23

2.43

2.40

2.59

The value of coefficient of viscosity in comparison to coefficient of friction is

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Very large

Very small

Nearly same

May be small or large

A 10 kg car is turning around a corner at 10 ms^-1. The radius of the circular arc is 10 m. Find the force between the types and pavement which is

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1.0 × 10⁶ N

1.0 × 10⁴ N

1.0 × 10² N

None of these

A disc of moment of inertia is 5 x 10^-3 kgm² is making 20 rad/sec. The torque required to stop it in 10 sec is

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1x10^-3 Nm

1x10^-2Nm

0.1x10^-3 Nm

None of these

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

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

Linear momentum is a vector quantity and has direction of

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Its displacement

Velocity

Acceleration

None of these

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None 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°

In a container having water filled up to a height h,a hole is made in the bottom.The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional h²

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

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

With a step-index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

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43 s per km

33 s per km

1 ns per km

33 ns per km

Young's modulus for water is

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0

2

5

9

Arsenic, antimony and phosphorous are the elements from

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third group

fourth group

fifth group

none of them

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a.

The separation of the fringes is X.

a is now halved and D is increased by a factor of 4.

What is the new fringe separation?

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16 X

8 X

4 X

2 X

The light which has components in all directions is called

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unpolarized light

polarized light

intense light

none of them

Bernoulli's equation is based upon law of conservation of

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Mass

Momentum

Energy

None

The each atom of pure Ge or Si shares neighboring electrons are

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Three

Four

Five

None of these

At terminal velocity the net force acting on it is

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Maximum

Minimum

Zero

None of these

Which of the fluid has ideal behaviour at low speeds

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Air

Blood

Honey

None of these

1 kg mass of a substance is equivalent to the mass of

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1.1 x 10³⁰ electrons

11 x 10¹⁹ electrons

1.6 x 10³¹ electrons

9.1 x 10¹⁹ electrons

If the distance of separation between two chares is increased,the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

How would the two vectors of the same magnitude have to be oriented. If they were to be combined to give a result equal to a vector of the same magnitude.

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60^o

120^o

270^o

None of these

The viscosity of fluid is described by

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Resistive forces of fluid

Frictional effect between different layers of a fluid

Flowing speed of fluid

None of these

If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift

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795

792

786

None

A normal to the waves front showing direction of propagating of wave is called

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Photon

Particle

Ray

Line

A tourmaline crystal is being used as an analyzer In one complete rotation of the crystal the number of excitation will be

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0

1

2

4

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

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

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0.5 N cm^-2

0.05 N cm^-2

50 N cm^-2

500 N cm^-2

The weight of an object is defined as

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the effect of the gravitational field on an object

force acting per unit mass

the gravitational force exerted on that object

the gravitational field exerted on that object

The field of a long bar magnet is like a

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Two pole pieces of magnet

Solenoid

Toroid

None of these

Young's modulus for tungsten is

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90

190

390

590

The idea of light as wave produced by

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Huygen

Newton

Thomos Young

Michelson

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

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Zero

10 N

20 N

10 √2 N

The normal human eye can focus a sharp image of an object located anywhere form infinity to a certain point called

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Far point

Near point

distant point

None of these

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

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60 J

120 J

30 J

0.2 J

Random error occurs when repeated measurements of the quantity under the same conditions gives

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Equal values

Different values

Increasing values

None of these

Calculate the critical angle when core refractive index is 1.50 and cladding of refractive index 1.48

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70.3^o

80.9^o

80.6^o

89.6^o

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

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Cannot be determine

Can be determined in same cases

Can be determined

None of these

How much deep inside the earth (radius R) should a man go so that his weight become one-fourth of that one earth's surface?

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R/4

R/2

3R/4

None of these

The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

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968 J

98 J

1980 J

None of these

Newton's rings are:

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Rectangular

spherical

Concetric circles

None of these

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Equation of continuity

Bernoulli's theorem

Toricelli's theorem

None of these

If the K.E.of a body becomes four times of the initial value.then new momentum will

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Become twice its initial value

Become three times.its initial value

Become four times.its initial value

Remains constant

Angle between ray of light and the corresponding wavefront is:

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0°

60°

90°

120°

If both the length and radius of rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

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

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Red

Green

Blue

Violet

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

Thick tar and honey have

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Small coefficient of viscosities

Large coefficient of viscosities

Zero coefficient of viscosities

Moderate coefficient of viscosities

Two monochromatic radiations X and Y are incident normally on a diffraction grating.The second order intensity maximum for X coincides with the third order intensity maximum for Y what is the ratio wavelength of X/wavelength of Y?

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1/2

2/3

3/2

2/1

The weight of 10 kg body falling freely is

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zero

98 N

9.8 N

10 N

In the absence of any force acting on a body

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its momentum changes with distance

its momentum is conserved

its momentum is not conserved

its momentum changes with time

The direction of angular displacement is determined by using

Choose an answer

Heat-to-tail rule

Fleming left hand rule

Right angle rule

None of these

N-kg^-1is the unit of

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Velocity

Force

Acceleration

None of these

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

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Angular velocity

Mass

Distribution of mass

Axis of rotation

Coulomb's force is also

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Single force

Mutual force

Self force

None of these

A boat of mass 40 kg os at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 m/s.What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Torque of a force is a vector quantity, its direction is determined by

Choose an answer

Right hand rule

Knowing the direction of F

Knowing the position of origin

none of these

If force and displacement of particle in the direction of force are doubled.Work would be

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Double

4 times

Half

1/4 times

A person is sitting in a traveling train and facing the engine.He tosses up a coin and the coin falls behind him.It can be concluded that the train is

Choose an answer

Moving forward and gaining speed

Moving forward forward and losing speed

Moving forward with uniform

Moving backward with uniform speed

The distance between two concentric wave fronts is

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A wave length

A half wavelength

Zero

None of these

By convention, the torques are taken as negative if they are in the

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downward direction

leftward direction

clockwise direction

anticlockwise direction

The typical example/examples of optically active crystals

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Quartz

Crystals of sodium chlorate

Crystals of sodium chloride

a and b

The dielectric constant K of an insulator can be

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-1

Zero

0.5

5

The biological sciences deal with the

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Living things

Non-living things

Both

None of these

The SI unit of heat is

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calorie

joule

electron volt

None of these

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

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Angular acceleration

Linear acceleration

No acceleration

None of these

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

Light waves are

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Transverse waves

Longitudinal waves

Compressional wave

None of these

SI unit for moment arm is

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Nm^-2

Nm

Kg ms²

None of them

The angle of incidence at which angle of refraction becomes 90⁰ is called

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Incident angle

Angle of refraction

Critical angle

Phase angle

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

If red light is incident on sea water it appears

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Red

Green

Blue

Yellow

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

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1.50 kw

15 kw

105 kw

150 kw

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

The waste material of the process in a digester is a good

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Inorganic fertilizer

Organic fertilizer

Waste disposal

b and c

Which of the following is the most common method to obtain polarized light?

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selective absorption

reflection from different surfaces

refraction through crystals

scattering by small particles

Measurement of a standard metre in terms of the wavelength of red cadmium light is

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1,563,163.5

1,553,363.5

155,553.5

1,553,163.5

One micron is equivalent to

Choose an answer

10^-4m

10^-6m

10⁴m

10⁶m

Shear stress addresses to the:

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Volume changes due to the applied stress

Shape changes due to the applied stress

Length changes due to the applied stress

All of the above

The centripetal acceleration is supplied by

Choose an answer

Applied force

Gravity

Initial velocity

None of these

The concentration in solution can be determined by the property known as

Choose an answer

Solubility

Insolubility

Optical activity

None of these

If the earth were to stop rotating, the value of 'g', the acceleration during to gravity at Delhi

Choose an answer

Increases

Decreases

Remains unchanged

Becomes zero

The maximum value of plane angle is

Choose an answer

2π radian

360°

One revolution

All of these

A long them flat sheet has a uniform surface charge density σ. The magnitude of the electric field at a distance 'r' from it is given by

Choose an answer

σ/∈_o

σ/2∈_o

σ/∈_or

σ/2∈_or

When the speed of a moving body is doubled

Choose an answer

Its P.E. is doubled

Its acceleration is doubled

Its K.E. is doubled

Momentum is doubled

The rotational analogue of Newtons second law of motion is

Choose an answer

mr²α

mrα

mrα²

None of these

When a body moves with increasing acceleration, its velocity-time graph is a

Choose an answer

straight line

horizontal straight line

vertical straight line

curve

The velocity of light in vacuum can be changed by changing:

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Frequency

Amplitude

Wavelength

None of these

The momentum of particle is numerically equal to its kinetic energy.What will be the velocity of the particle?

Choose an answer

4 m/s

1 m/s

2 m/s

None of these

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

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The hall had covered exactly half the distance

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

The ball had covered less than half the distance

The ball had covered more than half the distance

No entropy change is associated with:

Choose an answer

Isothermal

Adiabatic process

Isobaric process

None of them

Which of the following pairs of electrical units are the units equivalent?

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Coulomb; As^-1

Farad ; C^-1V

Pascal: Nm^-2

Volt ; JC

Polymers have specific gravity which is:

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Low as compared to even the lightest metal

High as compared to the heaviest metal

Intermediate

Any of these

None of tese

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

Choose an answer

Two times

Three times

Four times

Six times

The formula for the volume of a sphere is

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4 π²

4/3 π³

4/3 π²

5/3 π³

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

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Increasing gradually

Decreasing gradually

It is constant at the centre

None of these

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

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

Choose an answer

908 N

490 N

100 N

1380 N

An INTEASAT VI satellite operates at microwave frequencies of

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4, 6, 13, 16 GHZ

4, 5, 11, 13 GHz

4, 6, 11, 18 GHz

4, 6, 11 and 14 Ghz

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 typical speed of reconnaissance jet (SR-71) is

Choose an answer

900 ms^-1

950 ms^-1

980 ms^-1

990 ms^-1

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

Choose an answer

Increases

Decreases

Remains constant

None of these

By convention, the torques are taken as positive if they are in the

Choose an answer

upward direction

rightward direction

clockwise direction

anticlockwise direction

By calculating the area under the velocity time graph, we can find the

Choose an answer

Acceleration

Velocity

Distance

None of these

The transmission of information by light waves may be

Choose an answer

An audio signal

A television signal

A computer data signals

All of them

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

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

Choose an answer

20%

80%

50%

None of these

The shape of crystals other than a cube have

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Right angles

Not right angles

Not corners

None of these

In newton's rings see through the reflected light, centeral spo is:

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Bright

Dark

Either of the Two

None of these

The blood pressure of the person

Choose an answer

Decreases with age

Increases with age

Remains the same

None

Bulk modulus for tungsten is

Choose an answer

50

100

150

200

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

Choose an answer

80 m

20 m

160 m

40 m

Torque will be zero if

Choose an answer

body is at rest

rotating with uniform angular velocity

zero angular acceleration

all of them

J.J Thomson finds:

Choose an answer

Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

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

Choose an answer

Bulk modulus

Compressibility

Pressure coefficient

Volume coefficient

If v is the velocity of flow of liquid through a tube of area of cross-section A then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

Two resistances 4Ω and 6Ω are in series they are in parallel with a 10Ω resistance.The equivalent resistance is

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5Ω

8Ω

12Ω

20Ω

The forbidden energy gap in semiconductors

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Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

The ratio of electro static force to the gravitational force between them is of the order of

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10³⁶

10³⁸

10⁴⁰

10⁴²

In case of point source of light, shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

A body is floating in a liquid the up thrust on the body is

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Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

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

The value of young modulus in Nm^-2for water is

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70 x 10

2.2 x 10⁵

Zero

None of these

A body falling freely under the action of gravity has

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Constant weight

Variable weigth

Maximum weigth

No weigth

The mass of electrons in Me V is

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1.02 Mev/C²

0.51 Mev/C²

51 Mev/C²

102 Mev/C²

Thermal radiations are a type of:

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Mechanical waves

Electromagnetic waves

Alpha rays

Electrons

A material with high retentively and large corcivety most useful to make

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Electromagnet

Permanent magnet

Choke

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

When the first condition for equilibrium is satisfied, if means that there is no

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Linear acceleration

Angular acceleration

Both

None of these

The path followed by a ballistic missile is called

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parabolic trajectory

ballisitic trajectory

both of them

none of them

The minimum number of lenses used in compound microscope is

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1

2

3

4

Total mass when silver coins are added to box as 2.2 kg, 0.01001 Kg and 0.01002 Kg correct to appropriate precision

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2.3 Kg

2.2 Kg

2.43 Kg

2.67 Kg

A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become

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Infinite

Zero

Extremely small

Extremely large