Physics 12

+2 Physics

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CLASS 12 FULL PHYSICS

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

1. None of the above

2. unpolarised

3. partially plane polarised

4. completely polarised

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. 90%

2. 11%

3. 80%

4. 50%

The SI unit of magnetic flux is:

1. T

2. Wb m^-2

3. Wb

4. Tn^-2

The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:

1. π

2. π/2

3. zero

4. π/4

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

1. tesla

2. oersted

3. gauss

4. weber/metre²

The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :

1. yellow shift

2. green shift

3. violet shift

4. red shift

The permeability of a paramagnetic substance is:

1. very large

2. less than unity

3. small but more than unity

4. negative

The energy equivalent to mass defect is called :

1. enthalpy

2. internal energy

3. external energy

4. binding energy

For purely capacitive circuits, power factor is:

1. 1

2. infinity

3. 0

4. -1

The strength of the magnetic field around an infinite current carrying conductor is :

1. directly proportional to the distance

2. same everywhere

3. inversely proportional to the distance

4. None of these

Specific resistance of alkali metals is mostly affected by:

1. magnetic field

2. temperature

3. volume

4. pressure

The wavelength of a wave of frequency 10 kHz is:

1. 300 km

2. 30 m

3. 300 m

4. 30 km

A choke is used as a resistance in :

1. both ac and dc circuits

2. dc circuits

3. ac circuits

4. neither (a) nor (b)

The capacitance of earth, viewed as a spherical conductor of radius 6408 km is:

1. 680 µF

2. 1420 µF

3. 712 µF

4. 540 µF

Kinetic energy of emitted electrons depends upon :

1. nature of atmosphere surrounding the electrons

2. none of these

3. frequency

4. intensity

When the mass of a sample of a radioactive substance decreases, the mean life of the sample:

1. remain unchanged

2. increases

3. first decreases then increases

4. decreases

Poisson’s bright spot was discovered by:

1. Fraunhoffer

2. Fresnel

3. Rayleigh

4. Poisson

The number of electrons that constitute 1 A of current is:
(a) (b)
(c)
(d)

1. 6.25 × 10¹⁷

2. 6.25 × 10¹⁸

3. 6.25 × 10¹⁹

4. 6.25 × 10¹⁶

The SI units of electric dipole moment are:

1. Cm^-1

2. C

3. Nm^-1

4. Cm

A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :

1. 3/2 Ω

2. 2/3 Ω

3. 1/3 Ω

4. 1/2 Ω

Communication channel consists of:

1. transmission line only

2. free space only

3. optical fibre only

4. All

Natural radioactivity was discovered by:

1. Pauli

2. None of these

3. Joliot

4. Becquerel

The dimensions of E/Bare same as that of:

1. acceleration

2. current

3. charge

4. velocity

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

1. doubled

2. halved

3. quadrupled

4. unchanged

In photo electric emission, for alkali metals the threshold frequency lies in the:

1. infrared region

2. ultraviolet region

3. visible region

4. far end of the infrared region

The force between two parallel current carrying conductors is F. If the current in each conductor is doubled, then the force between them becomes :

1. 2F

2. 4F

3. F

4. F/4

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

1. oxygen

2. germanium

3. phosphorus

4. aluminium

The specific resistance of a rod of copper as compared to that of thin wire of copper is :

1. more

2. less

3. depends upon the length and area of cross-section of the wire

4. same

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

1. 1

2. l

3. ω²L

4. ω²LC

Which of the following is conserved when light waves interfere?

1. amplitude

2. none of these

3. intensity

4. phase

hen placed in a uniform field, a dipole experiences:

1. a torque

2. both a net force and torque

3. neither a net force nor a torque

4. a net force

With fall of temperature, the forbidden energy gap of a semiconductor

1. increases

2. decreases

3. sometimes increases and sometimes decreases

4. remains unchanged

If a mirror is approaching you at a speed of 10 ms^-1, the speed with which your image approach you is:

1. 5 ms^-1

2. 20 ms^-1

3. 10 ms^-1

4. 15 ms^-1

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

Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:

1. None of these

2. neutron

3. proton

4. electron

Isobars have the same:

1. Z

2. All the above

3. N

4. A

Who explained the splitting of special lines in magnetic field?

1. Zeeman

2. Einstein

3. Summerfield

4. Bohr

In parallel resonant circuit:

1. impedance is very high

2. None of these

3. voltage is very high

4. current is very high

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

1. 3.3 × 10^-24 kgms^-1

2. 6.4 × 10^-36 kgms^-1

3. 3.3 × 10^-34 kgms^-1

4. none of these

Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?

1. Hollow sphere

2. Both will have an equal charge

3. Solid sphere

4. None of these

The dimensional representation of magnetic flux density is :

1. [MLT^-2]

2. [MT^-2A^-1]

3. [MLT^-2A^-2]

4. [MLT^-2A^-1]

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

1. 1.6 ms^-2

2. 1.6 × 10¹⁸ms^-2

3. 3.2 × 10¹⁸ms^-2

4. 0.8 × 10¹⁸ ms^-2

Electric field in a cavity of metal:

1. is not necessarily zero

2. depends upon the surroundings

3. is always zero

4. depends upon the size of cavity

The Bohr model of atom:

1. predicts continuous emission spectra for atoms

2. assumes that the angular momentum of electron is quantized

3. predicts the same emission spectra for all types of atoms

4. uses Einstein’s photoelectric equation

Half-life of a substance depends on:

1. temperature

2. None of these

3. density

4. pressure

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

1. It requires a material medium for its propagation

2. It can travel through vacuum

3. It involve transportation energy

4. It has a finite speed

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^-2 H

2. 10^-4 H

3. 10^-8 H

4. 10^-6 H

An atom stays in an excited state for about:

1. 10 micro seconds

2. 10 seconds

3. 10 milli seconds

4. 10 nano seconds

Digital signals:

1. represents values as discrete steps

2. represent random steps

3. Do not represents values as discrete steps

4. represent values steps

What is the reason for your answer to the above question?

1. There is not constant phase difference between the waves emitted by the two sources

2. The two sources emit light waves of different amplitudes

3. The two sources do not emit light of the same wavelength

4. The two sources emit waves which travel with different speeds

Which of the following is blocked by a capacitor ?

1. D.C.

2. Both A.C. and D.C.

3. Neither A.C. nor D.C.

4. A.C.

The half life of a radioactive decay is n times its mean life, n is equal to:

1. 0.6930

2. 0.3070

3. 1/0.6930

4. 0.0693

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

1. 1

2. slightly more than 1

3. infinite

4. Zero

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. -4q

2. +2q

3. -3q

4. +3q

The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:

1. n ∝ T²

2. n ∝ T

3. n ∝ T^3/2

4. n ∝ T^1/2

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

3. π/4

4. zero

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

1. 8.0 × 10^-5 Wb/m²

2. 3.l4 × 10^-1 Wb/m²

3. 1.57 × 10^-3Wb/m²

4. 2.0 × 10^-3 Wb/m²

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

1. 10^-8

2. 2√2a₀

3. 4a₀

4. 2a₀

The resistance of a human body is about:

1. 120 MΩ

2. 12 KΩ

3. 12 Ω

4. 120 Ω

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. n

2. zero

3. π/2

4. 2n

The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

1. Pauli

2. Hund

3. None of these

4. Millikan

Broadcasting antenna are generally:

1. Horizontal type

2. Omni directional type

3. Vertical type

4. None

Frequency of a wave is 6 × 10¹⁵. Hz. The wave is :

1. X-ray

2. Radiowave

3. Microwave

4. Ultra violet

The magnetic flux linked with a coil is inversely proportional to the?

1. none of these

2. number of turns

3. magnetic field

4. area of cross section

A convergent lens will become less convergent in :

1. oil

2. both

3. none of these

4. water

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

1. large but not infinite

2. small but not zero

3. zero

4. infinite

Power factor of an ac circuit is a measure of:

1. all

2. mean power

3. virtual power

4. power lost in the circuit

The density of a nucleus is of the order of:

1. 10¹⁶ kg m^-3

2. 10¹⁷ kg m^-3

3. 10¹⁵ kg m^-3

4. 10¹⁸ kg m^-3

Kirchhoff's first and second laws for electrical circuits are consequences of:

1. conservation of electrical charge and energy respectively

2. conservation of electric charge

3. conservation of energy

4. neither conservation of energy nor electric charge

P-decay produces:

1. All the above

2. isotopes

3. isotones

4. isobars

The dielectric constant of a metal is:

1. ∞

2. -1

3. 1

4. 0

Light Year is the unit of:

1. distance

2. intensity of light

3. energy

4. time

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. 90 V

2. 120 V

3. 180 V

4. 45 V

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

1. Ampere’s law

2. Biot-Savart’s law

3. Gauss’s law

4. None of these

A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s^-1 . If the horizontal component of earth’s magnetism is 2 × 10^-5 T, then e.m.f. developed between the two ends of the conductor is:

1. 50 µV

2. 5 µV

3. 5 mV

4. 50 mV

The role of inductance is equivalent to:

1. energy

2. inertia

3. force

4. momentum

The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?

1. B

2. 2B

3. B/2

4. B/4

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

1. decreases

2. may increase or decrease

3. remains unchanged

4. increases

According to Yukawa’s theory of nuclear forces, the origin of nuclear force between nucleons is due to the exchange of

1. photons

2. positrons

3. electrons

4. mesons

The binding energy of a deuteron is about:

1. 2.22 MeV

2. 2.22 J

3. 2.22 eV

4. None of these

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

1. by superimposing it on damped electro-magnetic waves

2. by superimposing it on undamped electro-magnetic waves

3. through space

4. through wires

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

1. π/4

2. 2π

3. π

4. π/2

The capacitance of a capacitor will decrease if we introduce a slab of:

1. copper

2. None of these

3. zinc

4. aluminium

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

1. remote sensing

2. modulation

3. amplification

4. communication

The audio frequencies range from:

1. 20 Hz to 20.000 kHz

2. None of these

3. 20 Hz to 20 kHz

4. 20 kHz to 20.000 kHz

The space waves which are affected seriously by atmospheric conditions are:

1. MF

2. VHF

3. HUF

4. UHF

The phase difference between the electric and the magnetic field vectors in electromagnetic waves is

1. π/4

2. π/2

3. π

4. zero

Which of the following has higher magnetic susceptibility?

1. None of these

2. paramagnetic

3. diamagnetic

4. ferromagnetic

Choose the wrong statement?

1. Electromagnetic waves are produced by accelerating charges

2. Electromagnetic waves are transverse

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

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

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

1. 3 × 10¹⁰ ms

2. 3 × 10⁴ ms

3. 3 × 10⁶ ms

4. 3 × 10⁸ ms

A bird sitting on a high power line:

1. is not affected practically

2. gets a mild shock

3. gets killed instantly

4. gets a fatal shock

A charge + q is sent through a magnetic field. The force acting on it is maximum w hen the angle between the direction of motion of the charged particle and the magnetic field :

1. 90°

2. 45°

3. 180°

4. 0°

The P.E. of an electric dipole is maximum when it makes an angle θ with electric field. The value of θ is :

1. π

2. π/2

3. zero

4. 3π/2

The current sensitibility of a moving coil galanometer increases with decrease in:

1. magnetic field

2. area of a coil

3. number of turns

4. None of these

Choose the SI unit of electric potential energy :

1. Erg

2. Joule

3. Newton per coulomb

4. Coulomb

In semi conductor which are responsible for conduction:

1. None of these

2. electron and hole both

3. only electron

4. only hole

X-rays are:

1. deflected by an electric field

2. not deflected by electric and magnetic fields

3. deflected by both electric and magnetic fields

4. deflected by a magnetic field

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

1. (n + 1/2)π

2. nπ

3. zero

4. (2n + 1)π

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

1. equal to 13.6

2. a little less than 13.6

3. 3.4 or less

4. more than 13.6

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

1. 5

2. 4

3. 3

4. 6

Your score is

CLASS 11 FULL PHYSICS

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A resonating column of air contains

1. Stationary longitudinal waves

2. Stationary transverse waves

3. Transverse progressive waves

4. Longitudinal progressive waves

Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?

1. 2.00 m, 2.00 mm

2. 0.50 m, 0.50 mm

3. 4.00 m, 4.00 mm

4. 1.00 mm, 1.00 mm

The scientists who discovered natural radioactivity belonged to

1. Austria

2. Italy

3. England

4. France

The extension in a string, obeying Hookes law is X. The speed of sound in the stretched string is V. If the extension in the string is increased to 1.5 X, the speed of sound will be

1. 1.22 V

2. 1.50 V

3. 0.75 V

4. 0.61 V

The dimensions of kinetic energy is same as that of

1. force

2. momentum

3. work

4. pressure

The total flight requires a time that is?

1. twice the time necessary to reach the maximum height

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

3. thrice the time necessary to reach the maximum height

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

Two wires have the same material and length, but their masses are in the ration of 4 : 3. If they are stretched by the same force, their elongations will be in the ratio of

1. 3 : 4

2. 9 : 16

3. 4 : 3

4. 2 : 3

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. 6 cm

2. 16 cm

3. 2 cm

4. 4 cm

To demonstrate the phenomenon of beats we need

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

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

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

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

At critical temperature, the surface tension of a liquid

1. Is infinity

2. Is the same as that at any other temperature

3. Can not be determined

4. Is zero

The dimensional formula for acceleration is

1. [LT^-2]

2. [L²T²]

3. [L²T]

4. [LT²]

When the intermolecular distance increases due to tensile force, then

1. There is zero resultant force between the molecules

2. There is a repulsive force between the molecules

3. There is no force between the molecules

4. There is an attractive force between the molecules

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is:

1. 124°C

2. 62°C

3. 37°C

4. 99°C

A body starts from rest and travels with uniform acceleration of 2 m/s². If its velocity is v after making a displacement of 9 m, then v is

1. 4 m/s

2. 8 m/s

3. 6 m/s

4. 10 m/s

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. 0.99 T

2. T

3. 1.02 T

4. 1.01 T

A body of mass 20 kg is initially at a height of 3 m above the ground. It is lifted to a height of 2 m from that position. Its increase in potential energy is

1. 100 J

2. 392 J

3. -100 J

4. 60 J

Calculate the M.I. of a thin uniform ring about an axis tangent to the ring and in a plane of the ring, if its M.I. about an axis passing through the centre and perpendicular to plane is 4 kg m².

1. 3 kg m²

2. 6 kg m²

3. 12 kg m²

4. 9 kg m²

A body of mass 10 kg moving at a height of 2 m, with uniform speed of 2 m/s. Its total energy is

1. 316 J

2. 216 J

3. 392 J

4. 116 J

For a diatomic gas change in internal energy for a unit change in temperature for constant pressure and constant volume is U1 and U2 respectively. What is the ratio of U1 and U2?

1. 3 : 5

2. 5 : 3

3. 1 : 1

4. 5 : 7

If a body of mass m is taken out from a point below the surface of earth equal to half the radius of earth, R, to a height R above the earths surface, then work done on it will be

1. (5/6) mgR

2. (6/7) mgR

3. (8/9) mgR

4. (7/8) mgR

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

1. has constant velocity

2. has an outward radial acceleration

3. has no acceleration

4. has an inward acceleration

Hookes law essentially defines

1. Strain

2. Yield point

3. Stress

4. Elastic limit

A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is

1. 10 s

2. 5 s

3. 20 s

4. 6 s

Theory of relativity was discovered by

1. Pauli

2. Faraday

3. Maxwell

4. Einstein

Which is the wrong relation from the following?

1. t = I a

2. F = ma

3. I = t a

4. L = I w

Electric generator works on the scientific principle

1. Nuclear Fusion

2. Bernoulli’s Theorem

3. Laws of Thermodynamics

4. Electromagnetic Induction

A body cools from 50°C to 46°C in 5 minutes and to 40°C in the next 10 minutes. The surrounding temperature is

1. 30°C

2. 32°C

3. 28°C

4. 36°C

Moon has no atmosphere because

1. Its surface temperature is 10°C

2. The r.m.s. velocity of all the gas molecules is more then the escape velocity of the moons surface

3. It is far away form the surface of the earth

4. The escape velocity of the moons surface is more than the r.m.s velocity of all molecules

Inside the nucleus, two protons are held together by a force which overcomes the repulsion. This force is called

1. electrostatic force

2. strong force

3. gravitational force

4. weak force

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. 124 J

2. 198.8 J

3. 96.6 J

4. 215.4 J

String is in fundamental mode of vibration then velocity is directly proportional to _______

1. Square of tension

2. Square root of linear density

3. Square root of tension

4. Square root of length

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. 1200 J

2. 7.2 J

3. 120 J

4. 3.6 J

The volume of a cube in m³ is equal to the surface area of the cube in m². The volume of the cube is

1. 512 m³

2. 196 m³

3. 216 m³

4. 64 m³

The word Science originates from the Latin verb Scientia meaning

1. to see

2. to experience

3. to observe

4. to know

An isolated particle of mass m is moving in a horizontal plane (x-y), along the x-axis, at a certain height above the ground. It suddenly explodes into two fragments of masses m/4 and 3m/4 . An instant later, the smaller fragment is at y = + 15 cm. The larger fragment at this instant is at

1. y = -20 cm

2. y = +20 cm

3. y = -5 cm

4. y = +5 cm

A metal piece heated to T1°K. The temperature of the surrounding is T2°K. the heat in the surrounding due to radiation is proportional to

1. (T13 – T23)

2. (T14 – T24)

3. (T14 + T24)

4. (T1 – T2)4

Emissivity of perfectly black body is

1. 2

2. 5

3. 0

4. 1

The escape velocity of projection from the earth is approximately (R = 6400 km)

1. 12.2 km/sec

2. 112 km/sec

3. 7 km/sec

4. 1.1 km/sec

A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be

1. 1 sec

2. 10 sec

3. 4 sec

4. 8 sec

There is no atmosphere on the moon because

1. it is closer to the earth

2. it revolves round the earth

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

4. it gets light from the sun

The scientific method is

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

2. A procedure for proposing new hypothesis

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

4. A method for proposing new theories

The mass of a body is 2 kg. It weight is

1. 20 N

2. 19.6 N

3. 30 N

4. 40 N

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. at

2. 2bt

3. a + 2bt

4. zero

When angular velocity changes with respect to time then?

1. a linear velocity is produced

2. a linear acceleration is produced

3. it constitute a couple

4. an angular acceleration is produced

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. 9 m

2. 16 m

3. 12 m

4. 10 m

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. 4 m/s

2. 5 m/s

3. Zero

4. 3 m/s

In the case of forced oscillations, which of the following statements is not true?

1. amplitude tends to infinity at resonance

2. frequency equals that of external periodic force

3. higher the damping coefficient, lower is the amplitude at resonance

4. amplitude depends upon the damping coefficient

Plants get water through the roots because of

1. Viscosity

2. Gravity

3. Elasticity

4. Capillarity

The mass of a body which is equal to the ratio of the force acting on a body to the acceleration produced in the body is

1. the inertial mass

2. the internal mass

3. the gravitational mass

4. the electromagnetic mass

A ball is dropped from a height of 1 m. If the coffecient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

1. 1 m

2. 0.4 m

3. 0.6 m

4. 0.36 m

5 g of water rises in the bore of capillary tube when it is dipped in water. If the radius of bore capillary tube is doubled, the mass of water that rises in the capillary tube above the outside water level is

1. 1.5 g

2. 10 g

3. 15 g

4. 5 g

A body of M.I. 3 kg m² rotating with an angular velocity 2 rad/s has the same K.E. as a mass of 12 kg moving with a velocity of

1. 2 m/s

2. 4 m/s

3. 8 m/s

4. 1 m/s

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. 100 rad s^-1

2. 1 rad s^-1

3. 10 rad s^-1

4. 1 rad s^-1

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. 3 N

2. 1 N

3. 2 N

4. 4 N

The displacement in metres of a body varies with time t in second as y = t2 – t – 2. The displacement is zero for a positive of t equal to

1. 2 s

2. 1 s

3. 3 s

4. 4 s

According to kinetic theory of gases, at absolute zero of temperature

1. Liquid hydrogen freezes

2. Liquid helium freezes

3. Water freezes

4. Molecular motion stops

One radian is equal to?

1. 53.7o

2. 57.3o

3. 59.3o

4. 57.7o

Just as a new experiment may suggest an alternative theoretical model, a theoretical advance may suggest what to look for in some for in some experiments. Which of the following experiments can be considered to support this claim?

1. Michelson Morley experiment

2. scattering of alpha particle or the gold foil experiment

3. experimental discovery of positron

4. Davisson and Germer Experiment

Heat engine and refrigerator work on scientific principle :

1. Laws of Thermodynamics

2. Electromagnetic Induction

3. Bernoulli’s Theorem

4. Nuclear Fusion

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

1. 103 newton/m²

2. 104 newton/m²

3. 105 newton/m²

4. 106 newton/m²

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

1. Velocity against displacement

2. T.E. against displacement

3. Acceleration against time

4. P.E. against displacement

A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is
(a) 100 J
(b) 392 J
(c) 60 J
(d) -100 J

1. 100 J

2. 392 J

3. -100 J

4. 60 J

In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is

1. FAT2

2. FA2T

3. FA2T

4. FAT

Which one of the following is the unit of velocity?

1. second

2. m/s

3. kilogram

4. metre

Atomicity of charge was discovered by

1. Maxwell

2. Marie Curie

3. R.A. Millikan

4. Faraday

Physical quantities are

1. quantities such as pounds, dollars and rupees

2. quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity

3. quantities such as kilos, pounds and gallons

4. quantities such as degrees, radians and steradians

A passenger in a moving bus is thrown forward when the bus is suddenly stopped. This is explained

1. by the principle of conservation of momentum

2. by Newtons second law

3. by Newtons third law

4. by Newtons first law

The scattering of light by molecules was discovered by

1. Einstein

2. C.V. Raman

3. Newton

4. J. Bardeen

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 : 4

2. 4 : 1

3. 1 : 2

4. 2 : 1

A black body at a temperature of 227°C radiates heat at the rate of 20 cal m^-2s-1. When its temperature rises to 727°C, the heat radiated will be

1. 40 units

2. 320 units

3. 640 units

4. 160 units

A thermodynamical system is changed from state (P¹, V¹) to (P², V²) by two different processes, the quantity which will remain same is:

1. ΔW

2. ΔQ

3. ΔQ + ΔW

4. ΔQ – ΔW

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. zero

2. -20 J

3. 80 J

4. 20 J

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is

1. 4 L

2. L/4

3. L/2

4. 2 L

What is the dimensional formula of magnetic field?

1. M-1L-2TA-1

2. MT-2A-1

3. M-1LTA-2

4. MT-1A-2

A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is

1. Zero

2. may be positive or negative

3. Positive

4. Negative

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 diameters

3. cant be determined without knowing their masses

4. solid cylinder

Nuclear reactor works on the scientific principle

1. Bernoulli’s Theorem

2. Nuclear Fission

3. Laws of Thermodynamics

4. Electromagnetic Induction

Length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time – period of the pendulum of increased length is

1. 21%

2. 42%

3. 10%

4. 1%

The displacement y of a particle executing periodic motion is given by y = 4 cos² (t/2) sin (1000t). This expression may be considered to be a result of superposition of the following number of harmonic motions.

1. two

2. four

3. five

4. three

A block of wood is placed on a surface. A force is applied parallel to the surface to move the body. The frictional force developed acts

1. along the direction of the applied force

2. normal to the surface downwards

3. opposite to the direction of the applied force

4. normal to the surface upwards

When a compression is incident on rigid wall it is reflected as

1. Rarefaction with no phase change

2. Compression with a phase change of p

3. Compression with no phase change

4. Rarefaction with a phase change of p

A passenger sitting in a bus moving at uniform speed, feels pushed backward whenever the bus is accelerated forward. This type of force is called

1. real force

2. Gravitational force

3. fictitious force or pseudo force

4. frictional force

Newtonian mechanics could not explain

1. flight of rockets

2. movement of planets

3. Some of the most basic features of atomic phenomena

4. fall of bodies on earth

Wave nature of electron was discovered by

1. de Broglie

2. Roentgen

3. Einstein

4. Pauli

Water rises up to a height of 5 cm in a capillary tube of radius 2 mm. what is the radius of the radius of the capillary tube if the water rises up to a height of 10 cm in another capillary?

1. 3 mm

2. 4 mm

3. 1 mm

4. 1 cm

The branch of science which deals with the study of stars is called

1. Geology

2. Seismology

3. Astronomy

4. Meterology

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

1. H/m²

2. Weber(Wb)

3. Henry(H)

4. Wb/m²

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

1. Building a theory

2. Formulation of a question

3. Conducting tests

4. Formulating a hypothesis

An observer is moving towards a stationary source of frequency 250 Hz with a velocity of 40 m/s. If the velocity of sound is 330 m/s, the apparent frequency heard by the observer will be

1. 280 Hz

2. 300 Hz

3. 260 Hz

4. 320 Hz

One mole of mono atomic gas (g = 5/3) is mixed with one mole of diatomic gas (g = 7/5) what will be the value of g for the mixture?

1. 2.5

2. 2

3. 1.5

4. 1.0

A thin uniform, circular ring is rolling down an inclined plane of inclination 300 without slipping. Its linear acceleration along the inclined plane will be

1. g/3

2. 2g/3

3. g/4

4. g/2

A force F is given by F = at + bt², where t is time. What are the dimensions of a and b?

1. MLT-4 and MLT1

2. MLT-1 and MLT0

3. MLT-3 and MLT-4

4. MLT-3 and ML2T4

A car sometimes overturns while taking a turn. When it overturns, it is

1. the inner wheel which leaves the ground first

2. the outer wheel which leaves the ground first

3. both the wheel leave the ground simultaneously

4. either inner wheel or the outer wheel leaves the ground

A person with dark skin as compared to a person with white skin will experience

1. More heat and more cold

2. More heat and less cold

3. Less heat and less cold

4. Less heat and more cold

For increasing the angular velocity of an object by 10%, the kinetic energy has to be increased by

1. 20%

2. 40%

3. 10%

4. 21%

A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end correction, the velocity of sound in air will be

1. 920 m/s

2. 820 m/s

3. 1020 m/s

4. 720 m/s

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. 150 J

3. 600 J

4. zero

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

1. 3427 sec

2. 864 sec

3. 3727 sec

4. 3927 sec

The dimensions of kinetic energy is

1. [M 2L2T]

2. [ML 2T-2]

3. [ML 2T-1]

4. [ML 2T]

A body of mass 10 kg is moved parallel to the ground, through a distance of 2 m. The work done against gravitational force is

1. 196 J

2. zero

3. 20 J

4. -196 J

Your score is

Chapters Wise MCQs..

Chapter 1: Electric Charges and Fields.
Chapter 2: Electrostatic Potential and Capacitance.
Chapter 3: Current Electricity.
Chapter 4: Moving Charges and Magnetism.
Chapter 5: Magnetism and Matter.
Chapter 6: Electromagnetic Induction.
Chapter 7: Alternating Current.
Chapter 8: Electromagnetic Waves.
Chapter 9: Ray Optics and Optical Instruments.
Chapter 10: Wave Optics.
Chapter 11: Dual Nature of Radiation and Matter.
Chapter 12: Atoms.
Chapter 13: Nuclei.
Chapter 14: Semiconductor Electronics.
Chapter 15: Communication Systems.