Question # 1

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

In equation F=ma, then mass 'm' is

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rest mass

variable mass

inertial mass

gravitational mass

An object undergoes SHM. Its maximum equilibrium positions:

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Maximum

Half of its maximum value

Zero

None

When the atomic particle are moving with velocities approaching that of light:

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Newton's laws become valid

Relativistic effects become prominent

Botha(A) and (B) are valid

Neither (A)nor (B)

There mass becomes zero.

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None 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

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

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0.05 m

0.08 cm

0.8 m

0.008 m

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

Tick the conservation force:

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Tension in a string

Air resistance string

Elastic spring force

Frictional force

The length of rotating vector (on a certain scale) represents the:

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Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

In describing functions of digital systems, a closed switch will be shown as

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0

1

low

any one of these

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

A resistance used in galvanometer to make it voltmeter is called

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shunt resistance

high resistance

zero resistance

none of these

Which of the following is a state variable

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entropy

pressure

volume

all of them

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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Increase

Decrease

Remain F

Become 10F/9

Tick the conservative force

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Tension in a string

Air resistance

Elastic spring

Frictional force

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

Electromagnetic waves transport:

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Energy only

Momentum only

Both A and B are correct

None of is correct

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

Which of the following options correctly states the equation of continuity for an ideal fluid?

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A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

Essential characteristic of equilibrium is

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with

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maximum speed

zero speed

maximum speed

none of them

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to

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-q

+q

-2q

+4q

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

The wave form of SHM is

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Pulsed wave

Square wave

Triangular waved

Sine wave

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

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inverting input

non-inverting input

any one of the input terminal

none of them

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

If the object is situated at focus of a convex lens, then its image is formed at:

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F

2F

Infinity

None of these

If we increase the distance between two plates of the capacitor, the capacitance will

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Increase

Decrease

Remain same

First increase then decrease

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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Max plank

Newton

Einstein

J.J. Thomson

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be

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40 km/h

48 km/h

50 km/h

60 km/h

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

The number of "Earth Stations" which transmit signals to satellites and receive signals fro them are

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3

24

126

200

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

The pressure exerted by the gas is

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directly proportional to the P.E

inversely proportional to the P.E

inversely proportional to the K.E

directly proportional to the K.E

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Gaussian surface is always:

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Rectangular

Spherical

Cylinder

Box shape

Any of these

Amplitude in SHM is equivalent to_____ in circular motion:

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Diameter

Radius

Circumference

None of these

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

Certain light of wavelength 600 nm is used to view an object under the microscope. If the aperture of its objective is 1.22 cm, then the limiting angle of resolution will be:

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6 x 10^-5rad

7 x 10^-5rad

8 x 10^-5rad

None of these

The expression for restoring force is

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F=ma

F=kx

F= -kx

Kx=ma

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

The gavanometer constant of a moving coil galvanometer is given by

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K=BAN/C

K=BN/CA

K=NAC/B

K=C/BAN

The vector in space has:

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One component

Two components

Three components

None of these

An important part of inkjet printer is:

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Toner

Drum

Deflection plates

Heated roles

None of these

The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150°C to

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300°C

573°C

600°C

743°C

In transverse waves, the individual particles of the medium move:

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In circles

Perpendicular to the direction of level

Parallel to the direction of level

None of these

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

During the whole carnot cycle

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Thermal equilibrium is maintained

mechanical equilibrium is maintained

both the thermal and mechanical equilibriumis maintained

both the thermal and mechanical equilibrium is not maintained

The CRO is used for displaying the waveform of a given

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current

voltage

both of them

none of them

Position was discovered by Carl Anderson in

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1920

1925

1928

1932

Which of the following represents an electric current?

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C^-1

CS^-1

J.S^-1

dynes^-1

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

Astrophysics is a branch of physics, which deals with:

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Sub-atomic particles

Stars and galaxies

Light and sound

Music

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

A transistor has:

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One region

Two regions

Three regions

Four regions

None is correct

Rocket engines lift a rocket from the earth surface, because hot gas with high velocity

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Push against the air

React against the rocket and push it up

Heat up the air which lifts the rocket

Push against the earth

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

Addition of 2.189 kg, 0.089 kg, 11.8 kg, and 5.32 kg gives the rounded off answer as:

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19.398

19.400

19.4

19.3

An angle of 180° in circular motion is equivalent to ______ in SHM.

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Half the vibration

One vibration

3/4th of a vibration

None of these

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

A person starts his journey from a point 0, travels 4 Km SW, then 4 Km NW, and finally 4 Km north-east. At what distance is he now from point 0?

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0 Km

4 Km

8 Km

12 Km

The energy of photon 'E' is proported to

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The magnetic field H

The electric field E

Both the electric and magnetic field H and E

Frequency

The velocity of sound is greatest in

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Water

Air

Vacuum

Metal

The principle of superposition states that

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The total displacement due to several waves is the sum of the displacement due to those waves acting individually

Two stationary waves superimpose to give two progressive waves

A diffraction pattern consists of many interference patterns superimposed on one another

Two progressive waves superimpose to give a stationary wave

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

The example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

The study of physics involves?

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Structure of space and time

Interaction of electromagnetic radiation with matter

Both of them

Chemical changes

None of them

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

In an N-type silicon, which of the following statement is true

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Electrons are majority carriers and trivalent atoms are the dopants

Electrons are minority carriers and pentavalent atoms are the dopants

Holes are minority carriers and pentavalent atoms are the dopants

Holes are majority carriers and trivalent atoms are the dopants

______________ invented a symbolic way to write the statement "y is a function of x" as y= f(x)

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Leibniz

Newton

Euler

None of these

If all members of a sequence are real numbers then it is called

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A.P

Real Sequence

G.P

None of these

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3 x 2

2 x 3

3 x 3

2 x 2

If d₁is the distance between (0,0) and (1,2) and d₂is the distance between (0,0) and (-1,-2) the

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d₁< d₂

d₁> d₂

d₁= d₂

none of these

The center of the sphore which passes thro' (a, 0, 0), (0, b, 0), (0, 0, c) and (0, 0, 0) is

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Scalar matrix

Identity matrix

Null matrix

Symmetric matrix

If a set S contains n elements then P (S) has ........ number of elements

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2ⁿ

2ⁿ²

2.n

n²

Choose an answer

360°

180°

90°

None of these

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2C

C³

1

0

(x + 2)²= x²+ 4x + 4 is

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A linear equation

A cubic equation

A quadratic equation

None

A triangle has six

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side

elements

angle

tangents

Choose an answer

Zero matrix

Diagonal matrix

Column matrix

Scalar matrix

Range of sin x is ______

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[-1, 1]

R

Negative real numbers

None of these

The three noncollinear points through which a circle passe are known, then we can find the:

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Variables x and y

Value of x and c

three constants f,g and c

inverse of the circle

Z is a

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Infinite set

Finite set

Singleton set

Set of all integers

The equation of the sphere thro' the origin and making intercepts a, b, c on co-ordinate axes is

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x²+ y²+ z²+ ax + by + cz = 0

x²+ y²+ z²- 2ax - 2 by - 2 cz = 0

x²+ y²+ z²= a + b + c

x²+ y²+ z²- ax - by - cz =0

Choose an answer

A matrix with a single column is called

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Column matrix

Row matrix

Identity matrix

Null matrix

Order (or sense) of an inequality is changed by multiplying or dividing its each side by a:

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Zero

one

negative constant

Non negative constant

n(n-1)(2n-1), for all natural numbers n, is divisible by

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12

6

2

18

If #n = (n-5)2 + 5, then find #3 x #4.

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54

12

4

9

a.a^-1= a^-1.a = 1 is a

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Commutative law of multiplication

Multiplication identity

Associative law of multiplication

Multiplication inverse

Choose an answer

0

1

-A

-1

Choose an answer

Hermitian matrix

Skew-hermitian matrix

Symmetric matrix

Identity matrix

If a set S contains "n" elements then P (S) has ...... number of elements

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2ⁿ

2²ⁿ

2 . n

n²

∫x/Sin² x dx is equal to:

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x cot x + ln|sin⁡x |

-x cot x - ln|sin⁡x |

x cot x - ln|sin⁡x |

x. tan x- ln|sec⁡x |

Choose an answer

√2 is a number

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Rational

Irrational

Even

Odd

To each element of a group there corresponds ............. inverse element

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Two

One

No

Three

The extraction of cube root of a given number is a

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Unary Operation

Binary Operation

Relation

None of these

The period of|sin⁡2x| is

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π/2

-π/2

π

π/3

3x + 4 = 0 is

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not inequality

equation

identity

inequality

Sin-1(-x)=

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x

-x

-sin-1 x

cos-1 x

Choose an answer

n!

0!

1

None of these

Choose an answer

If 4 sin²θ=1, then values ofθare

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The sum of first n even number is

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n2

n(n+1)

n+1

n+2

a.a^-1 = a^-1.a = 1 is a

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Commutative law of multiplication

Multiplicative identity

Associative law of multiplication

Multiplicative inverse

Choose an answer

Two tangents drawn from (2,3) to the circle x2+y2 =9 are

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Real and distinct

Imaginary

Real and coincident

None of these

Choose an answer

None of these

The surface generated by lines, consists of two parts, called:

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vertex

apex

nappes

axis

Choose an answer

all

Choose an answer

sin x + c

-sin x + c

cos x + c

-cos x + c

The domain of an infinite sequence is a

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Set of natural numbers

R

Subset of N

None of the above

Write the first four terms of the sequence if a_n= (-1)ⁿn²

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-1, 4, -9, 16

1, -4, 9, 16

1, 4, 9, 16

None of these

Choose an answer

Derivative of a w.r.t x is

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0

1

x

Choose an answer

The range of the tangent function is

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all real numbers

-1 ≤ x ≥ 1

natural number

z⁺

Cos (α+β) - cos (α-β) =

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-2 sinα sinβ

2 sinαcosβ

-2 sinαcosα

4 sinα cosβ

If | x | < 1, then the first two terms of (1 - x)^1/2are

Choose an answer

-1

1

2

-2

The system of measurement in which the angle is measured in degrees, minutes and seconds is called the

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circular system

CGS system

sexagesimal system

none of these

The value of x, and y, when (x + iy)²= 5 + 4i

Choose an answer

X = 2, y = -1

X = -2, y=1

X = 2, y = -1

X = 2, y = 2

Choose an answer

(x, y)

(kx, y)

(x, ky)

(kx, ky)

Which is an explicit function

Choose an answer

y = x²+ 2x - 1

x²+ xy + y²= 2

x²+ y²= xy + 2

All are

Φset is the ______ of all sets?

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Subset

Union

Universal

Intersection

If the cutting plane is slightly tilted and cuts only one nappe of the cone, the resulting section is:

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an ellipse

Circle

a hyperbola

a parabola

The set {{a,b}} is

Choose an answer

Infinite set

Singleton set

Two points set

None

Choose an answer

Name the property used in 4 x (5 x 8) = ( 4 x 5) x 8

Choose an answer

Associative property of addition

Associative property of multiplication

Additive identity

Multiplicative identity

The line y = 4x + c touches the hyperbola x²- y²= 1 if

Choose an answer

The distance of the point (a, b) from x-axis is

Choose an answer

a

b

a + b

Choose an answer

At

-A

A

A-1

The number of tangents to the circle x2+ y2 -8x -6y +9 =0 which pass through the point (3,-2) is

Choose an answer

2

1

0

None of these

In a triangle ABC, if angle A = 72° , angle B = 48° and c = 9 cm then Ĉ is

Choose an answer

69°

66°

60°

63°

The upper 3/4 the portion of a vertical pole subtends an angle tan^-13/5 at a point in the horizontal plane through its foot and at a distance 40 m from the foot. A possible height of the vertical pole is