Physics 11

+1 Physics

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CLASS 11 FULL PHYSICS

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A body makes a displacement of 4 m due East from a point O and then makes displacement of 3 m due North. Its resultant displacement from O

1. 7 m

2. 5 m

3. 1.2 m

4. 1 m

Absolute error of the measurement is

1. the difference between the individual measurement and the true value of the quantity cubed.

2. the difference between two individual measurements and their mean

3. the difference between the individual measurement and the true value of the quantity squared.

4. the difference between the individual measurement and the true value of the quantity

A room temperature the r.m.s. velocity of the molecules of a certain diatomic gas is found to be 1930 m/sec. the gas is\

1. O²

2. F²

3. Cl²

4. H²

Energy is not carried by

1. Stationary wave

2. Transverse progressive waves

3. Electromagnetic waves

4. Longitudinal progressive waves

Heat engine and refrigerator work on scientific principle :

1. Nuclear Fusion

2. Bernoulli’s Theorem

3. Electromagnetic Induction

4. Laws of Thermodynamics

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased, so as to increase its efficiency by 50% of original efficiency?

1. 275 K

2. 250 K

3. 325 K

4. 380 K

A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

1. Is infinite

2. May decrease or increase depending upon size

3. Remains unchanged

4. Increases

Heliocentric theory proposed by Nicolas Copernicus was

1. replaced by elliptical orbits to fit the data better

2. replaced by elliptical orbits to fit the taste of new rulers of Italy

3. replaced by parabolic orbits to fit the data better

4. replaced by circular orbits to fit the data better

Electric generator works on the scientific principle

1. Nuclear Fusion

2. Bernoulli’s Theorem

3. Electromagnetic Induction

4. Laws of Thermodynamics

The dimensional formula for speed is

1. LT^-1

2. T^-1

3. L^-1T^-1

4. L^-1T

A small body attached at the end of an inextensible string completes a vertical circle, then its

1. angular momentum remains constant

2. total mechanical energy remains constant

3. linear momentum remains constant

4. angular velocity remains constant

When the intermolecular distance increases due to tensile force, then

1. There is a repulsive force between the molecules

2. There is no force between the molecules

3. There is zero resultant force between the molecules

4. There is an attractive force between the molecules

A body is traveling in a circle at constant speed. It

1. has an inward acceleration

2. has constant velocity

3. has no acceleration

4. has an outward radial acceleration

Which of the following units denotes the dimensions [ML2/Q2], where Q represents the electric charge?

1. Wb/m²

2. Henry(H)

3. H/m²

4. Weber(Wb)

Two soap bubbles have radii in the ratio of 4 : 3. What is the ratio of work done to below these bubbles?

1. 4 : 3

2. 09 : 16

3. 3 : 4

4. 16 : 9

Physics is a

1. Engineering Science

2. Applied Science

3. Mathematical Science

4. Natural Science

Four wires of identical lengths, diameters and material and stretched on a sonometer box. The ratio of their tension is 1 : 4 : 9 : 16. the ratio of their fundamental frequencies is

1. 4 : 3 : 2 : 1

2. 1 : 2 : 3 : 4

3. 1 : 4 : 9 : 16

4. 1 : 6 : 9 : 16

Two masses 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

1. 0 : 1

2. 1 : 2

3. 4 : 1

4. 1 : 6

A body of mass 10 kg is initially at a height of 20 m above the ground. It falls to a height of 5 m above the ground. Its potential energy in the new position is

1. 490 J

2. 50 J

3. 300 J

4. 100 J

Water rises up to a height of 4 cm, in a capillary tube immersed vertically in water. What will be the length of water column in the capillary tube, if the tube is immersed in water, at an angle of 60° with the vertical?

1. 6 cm

2. 4 cm

3. 2 cm

4. 8 cm

A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 × 10⁸N/m², then the tension in the rubber cord is

1. 200 N

2. 50 N

3. 25 N

4. 100 N

The scientific method is

1. A method for proposing new theories

2. a body of techniques for investigating phenomena, acquiring new knowledge…

3. A procedure for proposing new hypothesis

4. a prescribed method for investigating phenomena, acquiring new knowledge…

Which of the following groups have different dimensions?

1. Pressure, stress, Youngs modulus

2. Dipole moment, electric flux, electric field

3. Potential difference, EMF, voltage

4. Heat, energy, work done

For a gas, the r.m.s. speed at 800K is

1. Four times the value at 200 K

2. Double the value at 200 K

3. Same as at 200 K

4. Half the value at 200 K

The earth receives at its surface radiation from the sun at the rate of 1400 W/m². the distance of the centre of the sun from the surface of the earth is 1.5 1011 m and the radius of the sun is 7.0 108 m. treating sun as a black body, it follows from the above data that its surface temperature is,

1. 106 K

2. 5801 K

3. 50.1 K

4. 2801 C

Which is the wrong relation from the following?

1. t = I a

2. I = t a

3. L = I w

4. F = ma

Time period of simple pendulum of length l and a place where acceleration due to gravity is g is T. what is the period of a simple pendulum of the same length at a place where the acceleration due to gravity is 1.029 is,

1. 1.02 T

2. T

3. 0.99 T

4. 1.01 T

If the radius of the earth were to be raise by 1% its mass remaining the same, the acceleration due to gravity on the surface of the earth will

1. decrease by 1%

2. increase by 1%

3. increase by 2%

4. decrease by 2%

The value of g at a particular point is 9.8 m/sec² suppose the earth suddenly shrink uniformly to half its present size without losing any mass. The value of g at the same point (assuming that the distance of the point from the centre of the earth does not shrink) will become

1. 4.9 m/sec²

2. 2.45 m/sec²

3. 19.6 m/sec²

4. 9.8 m/sec²

The total flight requires a time that is?

1. four times the time necessary to reach the maximum height

2. equal to the time necessary to reach the maximum height

3. twice the time necessary to reach the maximum height

4. thrice the time necessary to reach the maximum height

A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is

1. Zero

2. 10g J

3. 5g J

4. 1g J

The path followed by a projectile is called its?

1. Territory

2. Treasury

3. Trajectory

4. Tractor

In damped oscillation, the angular frequency of the oscillator

1. fluctuates

2. keeps on increasing

3. keeps on decreasing

4. remains the same

A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

1. 2 km/h

2. zero

3. 1.5 km/h

4. 3 km/h

A coin kept on a rotating gramophone disc just begins to slip if its centre is at a distance of 8 cm from the centre of the disc. The angular velocity of the gramophone disc is then doubled. Through what distance, the coin should be shifted towards the centre, so that the coin will just slip?

1. 2 cm

2. 16 cm

3. 4 cm

4. 6 cm

The centripetal component of acceleration arises when?

1. The direction of gravity is changed

2. The direction propagation is changed

3. The direction of motion is changed

4. The direction of projectile is changed

The frame of reference attached to a satellite of the earth is

1. an inertial frame

2. an absolute frame at rest with respect to the stars

3. a gravitational frame

4. a non – inertial frame

A particle of mass 0.3 kg is subjected to a force F = -kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin?

1. 15 m/s²

2. 5 m/s²

3. 3 m/s²

4. 10 m/s²

Energy supplied to convert unit mass of substance from solid to liquid state at its melting point is called

1. Latent heat of fusion

2. Latent heat of fission

3. Solidification

4. Evaporation

In SHM, graph of which of the following is a straight line?

1. P.E. against displacement

2. Acceleration against time

3. T.E. against displacement

4. Velocity against displacement

An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. The electrical energy utilised is

1. 300 kWh

2. 100 kWh

3. 200 kWh

4. 150 kWh

A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platform from where the took the jump the total work done by the man at the instant he lands is

1. 300 J

2. zero

3. 600 J

4. 150 J

If 2 kcal, of heat is supplied to a system cause to change the internal energy of a gas is 5030 J, and external work done is 3350 J, then what is mechanical equivalent of heat?

1. 4190 J/cal

2. 41.90 J/kcal

3. 4.19 J/cal

4. 4.19 J/kcal

Hookes law essentially defines

1. Elastic limit

2. Yield point

3. Strain

4. Stress

A body starts from rest. If it travels with an acceleration of 2 m/s², its displacement at the end of 3 seconds is

1. 16 m

2. 10 m

3. 12 m

4. 9 m

An iron bar of length l m and cross section A m² is pulled by a force of F Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct

1. Elongation is inversely proportional to length l

2. Elongation is directly proportional to cross section A

3. Elongation is inversely proportional to A

4. Elongation is directly proportional to Youngs modulus

There is no atmosphere on the moon because

1. it revolves round the earth

2. it gets light from the sun

3. the escape velocity of gas molecules is less than their root mean square velocity here

4. it is closer to the earth

Emissivity of perfectly black body is

1. 5

2. 2

3. 1

4. 0

Which one of the following represents the correct dimensions of the coefficient of viscosity?

1. [MLT-1]

2. [ML-2T-2]

3. [ML-1T-2]

4. [ML-1T-1]

One radian is equal to?

1. 53.7o

2. 59.3o

3. 57.3o

4. 57.7o

The dimensional formula for acceleration is

1. [L²T²]

2. [LT^-2]

3. [L²T]

4. [LT²]

The dimensions of kinetic energy is

1. [ML 2T-2]

2. [M 2L2T]

3. [ML 2T]

4. [ML 2T-1]

The earth intercepts approximately one billionth of the power radiated by the sun. if the surface temperature of the sun were to drop by a factor of 2, the average radiant energy incident on earth per second would reduce by factor of

1. 4

2. 16

3. 2

4. 8

The upper end of wire 1 m long and 2 mm radius is clamped. The lower end is twisted through an angle of 45°. The angle of shear is

1. 0.09°

2. 0.9°

3. 90°

4. 9°

Newtonian mechanics could not explain

1. movement of planets

2. flight of rockets

3. Some of the most basic features of atomic phenomena

4. fall of bodies on earth

In SI system the fundamental units are

1. meter, kilogram, second, coulomb, Kelvin, mole and candela

2. meter, Newton, second, ampere, Kelvin, mole and candela

3. meter, kilogram, second, ampere, Kelvin, mole and candela

4. meter, kilogram, second, ampere, Kelvin, mole and lux

A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

1. 300

2. 0

3. 450

4. 600

The period of a simple harmonic oscillator is 2 sec. The ratio of its maximum velocity and maximum acceleration is

1. 2𝝅

2. 𝝅

3. 1/𝝅

4. 4

With the increase in temperature, the frequency of the sound from an organ pipe

1. Remain unchanged

2. Changes erratically

3. Increases

4. Decreases

A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is

1. R/4

2. R/2

3. R/3

4. R

An ideal gas is that which can

1. Not be solidified

2. Not be liquefied

3. Be solidified

4. Liquefied

In a thermodynamic process, pressure of a fixed mass of the gas is changed in such a manner that the gas molecules give out 30 J of heat. Also, 10 J of work is done on the gas. If the internal energy of the gas was 40 J, what will be the final internal energy?

1. 20 J

2. -20 J

3. zero

4. 80 J

In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be

1. 4 E

2. E

3. 25 E

4. 2 E

The good absorber of heat are

1. Good-emitter

2. Highly polished

3. Non-emitter

4. Poor-emitter

At a certain temperature, hydrogen molecules have r.m.s. velocity of 3 km/s. what is the r.m.s velocity of the oxygen molecules at the same temperature?

1. 0.75 km/s

2. 0.25 km/s

3. 6 km/s

4. 0.5 km/s

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

1. 120 J

2. 7.2 J

3. 1200 J

4. 3.6 J

A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is

1. 3 km/h

2. 2 km/h

3. 1.5 km/h

4. zero

A cyclist goes round a circular path of circumference 343 m in s. The angle made by him, with the vertical is

1. 420

2. 430

3. 450

4. 440

If a simple harmonic oscillator has got a displacement of 0.02 m and acceleration equal to 2.0 ms^-2 at any time, the angular frequency of the oscillator is equal to

1. 1 rad s^-1

2. 1 rad s^-1

3. 10 rad s^-1

4. 100 rad s^-1

Which of the following is a possible final step in applying the scientific method

1. Formulation of a question

2. Building a theory

3. Formulating a hypothesis

4. Analysis of test results

A bullet of mass 25 g moving with a velocity of 200 cm/s is stopped within 5 cm of the target. The average resistance offered by the target is

1. 2 N

2. 3 N

3. 1 N

4. 4 N

A quantity of work of 1000 J is done in 2 seconds. The power utilised is

1. 1002 W

2. 998 W

3. 2000 W

4. 500 W

The path of a particle is given by the expression y = at + bt², where a and b are constants . Y is the displacement at time t. Its velocity at any instant is given by

1. zero

2. a + 2bt

3. at

4. 2bt

The motion of a particle executing simple harmonic motion is given by X = 0.01 sin 100p (t + 0.05), where X is in metres ant t in second. The time period in second is

1. 0.02

2. 0.001

3. 0.2

4. 0.1

When a particle performing uniform circular motion of radius 10 cm undergoes the SHM, what will be its amplitude?

1. 20 cm

2. 2.5 cm

3. 5 cm

4. 10 cm

Moment of inertia depends on

1. Distribution of particles

2. All of these

3. Position of axis of rotation

4. Mass

Longitudinal strain is possible in the case of

1. Liquid

2. Only gases & liquids

3. Only solids

4. Gases

Which of the following parameters dose not characterize the thermodynamic state of matter?

1. pressure

2. work

3. Temperature

4. volume

Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio

1. 1 : 2

2. 2 : 1

3. 1 : 4

4. 4 : 1

What is the dimensional formula of magnetic field?

1. MT-1A-2

2. MT-2A-1

3. M-1L-2TA-1

4. M-1LTA-2

A particle moves for 20 s with velocity 3 m/s and then moves with velocity 4 m/s for another 20 s and finally moves with velocity 5 m/s for next 20 s. what is the average velocity of the particle?

1. Zero

2. 5 m/s

3. 4 m/s

4. 3 m/s

To demonstrate the phenomenon of beats we need

1. Two sources which emit radiation of exactly the same frequency and have a definite phase relationship

2. Two sources which emit radiation of exactly the same wavelength

3. Two sources which emit radiation of nearly the same frequency

4. Two sources which emit radiation of exactly the same frequency

A whistle giving out 450 Hz approaches a stationary observer at a speed of 33 m/s. The frequency heard by the observer in Hz is

1. 429

2. 517

3. 500

4. 409

The radii of two wires of a same material are in ratio 2 : 1. if the wires are stretched by equal forces, the stress produced in them will be

1. 4 : 1

2. 1 : 4

3. 2 : 1

4. 1 : 2

Two stars A and B radiate maximum energy at 3600°A and 3600°A respectively. Then the ratio of absolute temperatures of A and B is

1. 4 : 3

2. 81 : 256

3. 3 : 4

4. 256 : 81

A hollow cylinder and a solid cylinder having different mass diameter are released from rest simultaneously from the of an inclined plane. Which will reach the bottom first?

1. hollow cylinder

2. cant be determined without knowing their masses

3. cant be determined without knowing their diameters

4. solid cylinder

Which of the following pairs has the same dimensions?

1. specific heat and latent heat

2. lmpulse and momentum

3. moment of lnertia and torque

4. surface tension and force

A capillary tube when immersed vertically in a liquid records a rise of 3 cm. if the tube is immersed in the liquid at an angle of 60° with the vertical, then length of the liquid column along the tube will be

1. 3 cm

2. 6 cm

3. 9 cm

4. 2 cm

Wave nature of electron was discovered by

1. de Broglie

2. Pauli

3. Einstein

4. Roentgen

A body is sliding down a rough inclined plane which makes an angle of 30 degree with the horizontal. If the coeffcient of friction is 0.26, the acceleration in m/s² is

1. 1.95

2. 2.78

3. 3.47

4. 4.6

What would be the duration of the year if the distance between the earth and the sun gets doubled?

1. 129 days

2. 365 days

3. 730 days

4. 1032 days

One mole of an ideal gas requires 207 J heat to raise the temperature by 10 K, when heated at constant pressure. If the same gas is heated at constant volume to raise the temperature by 10K, then heat required is

1. 198.8 J

2. 215.4 J

3. 96.6 J

4. 124 J

Which of the following statements is correct for any thermodynamic system?

1. The internal energy changes in all processes

2. The change in entropy can never be zero

3. Internal energy and entropy are state functions

4. The work done in an adiabatic process is always zero

A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

1. 10 s

2. 6 s

3. 9 s

4. 12 s

A solid cylinder of mass 20 kg, has length 1 metre and radius 0.5m. then its momentum of inertia in kg m² about its geometrical axis is

1. 5

2. 1.5

3. 3

4. 2.5

If the length of seconds pendulum is increased by 2%, how may seconds it will lose per day?

1. 864 sec

2. 3427 sec

3. 3927 sec

4. 3727 sec

The word Science originates from the Latin verb Scientia meaning

1. to know

2. to experience

3. to observe

4. to see

For a magnet of time period T magnetic moment is M, if the magnetic moment becomes one fourth of the initial value, then the time period of oscillation becomes.

1. Half of initial value

2. Double of initial value

3. One fourth of initial value

4. Four time initial value

The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

1. 106 newton/m²

2. 103 newton/m²

3. 105 newton/m²

4. 104 newton/m²

Loudness of a note of sound is

1. Directly proportional to square of velocity of the wave

2. Directly proportional to amplitude of the wave

3. Directly proportional to square of amplitude of wave

4. Directly proportional to velocity of the wave

Your score is

CLASS 12 FULL PHYSICS

These MCQs are intended for checking your Physics, All Chapters knowledge!!

for more new questions refresh this page !!

The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:

1. √2

2. 1/√3

3. 1

4. can’t be determined

Communication channel consists of:

1. All

2. free space only

3. optical fibre only

4. transmission line only

The audio frequencies range from:

1. 20 kHz to 20.000 kHz

2. 20 Hz to 20.000 kHz

3. None of these

4. 20 Hz to 20 kHz

Name the law which states that a varying electric field produces a magnetic field:

1. Biot-Savart’s law

2. Faraday’s law

3. Modified Ampere’s law

4. None of these

De-Broglie equation states the:

1. particle nature

2. none of these

3. wave nature

4. dual nature

Which one of the following is the unit of electric field?

1. Volt

2. Coulomb

3. N/C

4. Newton

The modulation index in amplitude modulation is:

1. Between 0 and 1

2. Between 1 and ∞

3. Always zero

4. None of these

Power factor of an ac circuit is a measure of:

1. all

2. mean power

3. power lost in the circuit

4. virtual power

An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

1. 120 V

2. 15 V

3. 960 V

4. 180 V

The momentum of an electron that emits a wavelength of 2 Å. will be:

1. 3.3 × 10^-34 kgms^-1

2. 3.3 × 10^-24 kgms^-1

3. 6.4 × 10^-36 kgms^-1

4. none of these

An antenna is:

1. Capacitive

2. A transformer

3. Inductive

4. Resistive

On applying reverse bias to a junction diode, it:

1. lowers the potential barrier

2. increases the minority carrier current

3. raise the potential barrier

4. increases the majority carrier current

Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:

1. 2n

2. π/2

3. zero

4. n

How many different resistances are possible with two equal resistors?

1. 3

2. 5

3. 2

4. 4

For germanium crystal, the forbidden energy gap in joules

1. 1.6 × 10^-19

2. zero

3. 1.76 × 10^-19

4. 1.216 × 10^-19

An EMW of v = 3 MHz passes from vacuum into dielectric medium with permittivity E_r = 4, then:

1. Wavelength is halved and the frequency remains unchanged

2. Wavelength is doubled and the frequency become half

3. Wavelength and frequency both remain unchanged

4. Wavelength is doubled and the frequency remains unchanged

Two point charges +8q and -2q are located at ,v = O and ,v = L respectively. The location of a point on the .v-axis at which the net electric field due to these two point charges b is zero :

1. L/4

2. 8L

3. 2L

4. 4L

An electron is sent in an electric field of magnitude 9.1 × 10⁶NC^-1. The acceleration produced in it is :

1. 1.6 × 10¹⁸ms^-2

2. 0.8 × 10¹⁸ ms^-2

3. 3.2 × 10¹⁸ms^-2

4. 1.6 ms^-2

The magnetic field is parallel to a surface, then the magnetic flux through the surface is :

1. small but not zero

2. zero

3. large but not infinite

4. infinite

A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :

1. π/2

2. π/4

3. zero

4. π

What is the ratio of inductive and capacitance reactance in an ac circuit?

1. ω²L

2. 1

3. ω²LC

4. l

If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be :

1. 2L, 2A

2. 2L, A/2

3. L/2, 2A

4. L, 2A

An acceptor circuit is :

1. LCR circuit

2. parallel resonant circuit

3. series resonant circuit

4. None of these

Which of the following laws was modified by Maxwell by introducing the displacement current?

1. None of these

2. Gauss’s law

3. Biot-Savart’s law

4. Ampere’s law

In non-uniform electric field, electric dipole experiences:

1. torque as well as net force

2. force only

3. torque only

4. None of these

The SI units of electric dipole moment are:

1. Nm^-1

2. C

3. Cm^-1

4. Cm

Which of the following is blocked by a capacitor ?

1. Both A.C. and D.C.

2. Neither A.C. nor D.C.

3. A.C.

4. D.C.

The ratio of specific charge of an alpha particle to the proton is:

1. 4 : 1

2. 1 : 2

3. 1 : 4

4. 2 : 1

The graph drawn between V are r for a non-conducting charged solid sphere of radius R for r < R will be :

1. hyperbola

2. None of these

3. parabola

4. straight line

A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:

1. 10^-6 H

2. 10^-8 H

3. 10^-4 H

4. 10^-2 H

A soap bubble is given a negative charge, then its radius:

1. decreases

2. may increase or decrease

3. increases

4. remains unchanged

A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is:

1. 11%

2. 90%

3. 80%

4. 50%

EMW are produced by:

1. all

2. charge in uniform motion only

3. charge at rest only

4. accelerated or decelerated charge only

Two wires of copper are of the same length but’have different diameters. When they are connected in series across a battery, the heat generated is H₁ When connected in parallel across the same battery, the heat generated during the same time is H₂ Then :

1. H₁ = H₂

2. H₁ < H₂

3. H₁ > H₂

4. H₁ > H₂

What is the angle of dip at the magnetic poles ?

1. 0°

2. 45°

3. None of these

4. 30°

The magnetic lines of force inside a bar magnet:

1. depends on area of cross-section of bar magnet

2. do not exist

3. are from N-pole to S-pole of the magnet

4. are from S-pole to N-pole of the magnet

The concept of electron spin was introduced by:

1. Goudsmit

2. Uhlenbeek and Goudsmit

3. Becquerel

4. Millikan

Specific resistance of alkali metals is mostly affected by:

1. magnetic field

2. volume

3. temperature

4. pressure

Poisson’s bright spot was discovered by:

1. Fresnel

2. Poisson

3. Fraunhoffer

4. Rayleigh

Choose the wrong statement?

1. Electromagnetic waves travel with the same speed in all media

2. Electromagnetic waves are transverse

3. Electromagnetic waves travel with the speed of light in free space

4. Electromagnetic waves are produced by accelerating charges

In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is :

1. logarithmic

2. algebraic

3. exponential

4. linear

The strength of photoelectric current depends upon :

1. intensity of incident radiation

2. angle of incident radiation

3. frequency of incident radiation

4. distance between anode and cathode

In space communication, the sound waves can be sent from one place to another:

1. by superimposing it on damped electro-magnetic waves

2. through wires

3. through space

4. by superimposing it on undamped electro-magnetic waves

The velocity of electromagnetic wave is:

1. 3 × 10⁶ ms^-1

2. 3 × 10⁸ ms^-1

3. 3 × 10⁵ ms^-1

4. 3 × 10¹⁰ ms^-1

P-decay produces:

1. isobars

2. isotones

3. All the above

4. isotopes

If I current is flowing inductance L, then the dimension of 3/2 LI² is equivalent to:

1. momentum

2. energy

3. force

4. charge

Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?

1. Energy

2. Frequency

3. Momentum

4. Time period

Bonds in a semiconductor :

1. covalent

2. monovalent

3. bivalent

4. trivalent

Rutherford is the unit of:

1. energy

2. magnetic field

3. radioactivity

4. photoelectric current

A current carrying power line carries current from west to east. Then the direction of the magnetic field 2 m above it is :

1. None of these

2. south to north

3. west to east

4. north to south

If radio active nuclei emits β-particle, then mass-number:

1. decreases by 2 unit

2. increased by 1 unit

3. decreases by 1 unit

4. increases by 2 unit

A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:

1. √3

2. 3

3. 1/√3

4. 1/3

Two lens of power -15 D and +5 D are placed in contact co-axially. The focal length of equivalent lens is:

1. None

2. -10 cm

3. +10 cm

4. -20 cm

Given three equal resistors, how many different combinations (taken all of them together) can be made?

1. 3

2. 6

3. 5

4. 4

Millikan’s oil drop experiment makes use of:

1. Bernoulli’s theorem

2. Boyle’s law

3. Gas equation

4. Stokes’ law

Which of the following is not a unit of magnetic induction?

1. tesla

2. oersted

3. weber/metre²

4. gauss

Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :

1. +3q

2. +2q

3. -3q

4. -4q

A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?

1. There is no change in diffraction pattern

2. Diffraction fringes become narrower and crowded

3. The diffraction pattern disappear

4. Diffraction fringes become broader and farther apart

The length of a conductor is halved. Its resistance will be :

1. halved

2. unchanged

3. quadrupled

4. doubled

The coupling co-efficient of the perfectly coupled coils is:

1. 1

2. infinite

3. Zero

4. slightly more than 1

Who first demonstrated the existence of em waves?

1. Faraday

2. Hertz

3. Ampere

4. Maxwell

On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become:

1. half

2. one-fourth

3. four times

4. double

The resistance of a human body is about:

1. 120 MΩ

2. 120 Ω

3. 12 Ω

4. 12 KΩ

In semi conductor which are responsible for conduction:

1. only electron

2. None of these

3. only hole

4. electron and hole both

The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

1. 24 V

2. 6 V

3. 48 V

4. 12 V

For sustained interference, we need two sources which
emit radiations :

1. None of these

2. of the same intensity

3. having a constant phase difference

4. of the same amplitude

If the magnetic flux linked with a coil through which a current off ampere is set up is ∅, then the coefficient of self-inductance of the coil is:

1. ∅l

2. ∅/l

3. l/∅

4. None of these

Which of the following is not transducer?

1. Microphone

2. All

3. Loudspeaker

4. Amplifier

A bird sitting on a high power line:

1. is not affected practically

2. gets a fatal shock

3. gets killed instantly

4. gets a mild shock

The term used “to collect the information about an object and a place without physical contact” is called :

1. communication

2. modulation

3. remote sensing

4. amplification

Who undertook the first space walk and in which year?

1. Neil Armstrong, 1969

2. Rakesh Sharma. 1998

3. None of these

4. Leonov 1965

A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

1. cell is < E

2. capacitor is E

3. cell is > E

4. cell is E

When a polaroid is rotated, the intensity of light does not vary. The incident light may be:

1. completely polarised

2. None of the above

3. partially plane polarised

4. unpolarised

Radius of 1st Bohr orbit is a₀ (= 0.529 Å) What is the radius of 2nd Bohr orbit?

1. 2a₀

2. 2√2a₀

3. 4a₀

4. 10^-8

Faraday constant:

1. depends on the amount of the electrolyte

2. depends on the current in the electrolyte

3. depends on the amount of charge passed through the electrolyte

4. is a universal constant

Which of-the following is not a property of light?

1. It has a finite speed

2. It can travel through vacuum

3. It involve transportation energy

4. It requires a material medium for its propagation

Name the man who was first to place his foot on the moon and in which year:

1. None of these

2. Neil Armstrong, 1969

3. James Van A lien, 1971

4. Leonov, 1965

The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to water is:

1. 9/8

2. 7/6

3. 8/9

4. 2

If u_e and u_m arc the electric and magnetic field densities in an electromagnetic wave, then (c is the speed of light):

1. u_e = u_m

2. u_e = u_m/c

3. u_e = c u_m

4. None of these

The binding energy of a deuteron is about:

1. 2.22 J

2. None of these

3. 2.22 eV

4. 2.22 MeV

S.I. unit of flux is :

1. Tesla

2. Ohm

3. Weber

4. None

The speed at which the current travels in a conductor is nearly:

1. 3 × 10¹⁰ ms

2. 3 × 10⁶ ms

3. 3 × 10⁸ ms

4. 3 × 10⁴ ms

The dielectric constant of a metal is:

1. ∞

2. 0

3. -1

4. 1

The sensitivity of a tangent galvanometer can be increased by increasing:

1. the radius of the coil

2. the number of turns of the coil

3. all the above

4. the external magnetic field

Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :

1. 2.0 × 10^-3 Wb/m²

2. 8.0 × 10^-5 Wb/m²

3. 3.l4 × 10^-1 Wb/m²

4. 1.57 × 10^-3Wb/m²

To obtain p-type silicon semiconductor, we need to dope pure silicon with:

1. phosphorus

2. oxygen

3. germanium

4. aluminium

For ionization of excited Hydrogen atom, the, required energy is:

1. more than 13.6

2. 3.4 or less

3. a little less than 13.6

4. equal to 13.6

Number of electrons in the valence shell of a semiconductor is:

1. 3

2. 4

3. 1

4. 2

In Thomson’s experiment number of parabola gives :

1. the no. of electrons present in element

2. the no. of proton present in element

3. the no. of neutrons present in element

4. the no. of isotopes of the element present

Which of the following radiations cannot eject photo electrons?

1. infrared

2. ultraviolet

3. X-rays

4. visible

In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):

1. nπ

2. (2n + 1)π

3. (n + 1/2)π

4. zero

The dimensional representation of cu will be :

1. None of these

2. [M^-1L^-3T⁴A²]

3. [ML^-2T ]

4. [MLT⁴ A²]

A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?

1. N to S

2. E to W

3. W to E

4. S to N

Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop ?

1. 120 V

2. 90 V

3. 45 V

4. 180 V

Energy dissipates in LCR circuit in :

1. R only

2. C only

3. L only

4. All

When we double the radius of a coil keeping the current through it unchanged, what happens to the magnetic field directed along its axis at far off points?

1. halved

2. remains unchanged

3. doubled

4. quadrupled

The number of electron-taken out from a body to produce 1 coulomb of charge will be :

1. 6.023 × 10²³

2. None

3. 6.25 × 10¹⁸

4. 625 × 10¹⁸

The magnetic flux (∅) linked with a coil is related to the number of turns (N) of the coil as:

1. f ∝ N^-2

2. f ∝ N^-1

3. f ∝ N

4. f ∝ N²

What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?

1. 1.23 Å

2. None of these

3. 0.123 Å

4. 12.3 Å

On reflection from a denser medium, a light wave suffers a phase difference of:

1. 2π

2. π/4

3. π

4. π/2

Your score is

Chapters Wise MCQs..

Chapter 1: Physical World.
Chapter 2: Units and Measurement.
Chapter 3: Motion in a Straight Line.
Chapter 4: Motion in a Plane.
Chapter 5: Laws of Motion.
Chapter 6: Work, Energy and Power.
Chapter 7: System of Particles and Rotational Motion.
Chapter 8: Gravitation.
Chapter 9: Mechanical Properties of Solids.
Chapter 10: Mechanical Properties of Fluid.
Chapter 11: Thermal Properties of Matter.
Chapter 12: Thermodynamics.
Chapter 13: Kinetic Theory of gases.
Chapter 14: Oscillations.
Chapter 15: Waves.