Physics 12

+2 Physics

All +2 Physics Chapters Mcq is given here for students to study and prepare for their exams. These Mcqs are designed specially by the experts to give students a clear understanding of the topic. Students must read the Mcq thoroughly and solve the Mcq questions to get a clear idea about the Physics subject.

CLASS 12 FULL PHYSICS

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

for more new questions refresh this page !!

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

1. photons

2. electrons

3. mesons

4. positrons

Ferrites may be:

1. None of the above

2. ferromagnetic

3. ferrimagnetic

4. ant. ferromagnetic

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 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^-8 H

2. 10^-4 H

3. 10^-2 H

4. 10^-6 H

The density of a nucleus is of the order of:

1. 10¹⁵ kg m^-3

2. 10¹⁸ kg m^-3

3. 10¹⁷ kg m^-3

4. 10¹⁶ kg m^-3

The dielectric constant of a metal is:

1. 0

2. 1

3. -1

4. ∞

The dimensional formula of impedance is;

1. [ML²T^-2A^-3]

2. [ML²T^-2A^-2]

3. [ML²T^-2A^-1]

4. [ML²T^-3A^-2]

Bonds in a semiconductor :

1. monovalent

2. covalent

3. trivalent

4. bivalent

The concept of electron spin was introduced by:

1. Millikan

2. Goudsmit

3. Uhlenbeek and Goudsmit

4. Becquerel

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. 2.0 × 10^-3 Wb/m²

3. 1.57 × 10^-3Wb/m²

4. 3.l4 × 10^-1 Wb/m²

Which of the following effects is not shown in alternating current ?

1. Heating current

2. Chemical effect

3. All

4. Magnetic effect

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

1. decreases by 2 unit

2. increases by 2 unit

3. increased by 1 unit

4. decreases by 1 unit

The binding energy of a deuteron is about:

1. 2.22 eV

2. 2.22 MeV

3. 2.22 J

4. None of these

Poisson’s bright spot was discovered by:

1. Fresnel

2. Fraunhoffer

3. Rayleigh

4. Poisson

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

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

1. conservation of energy

2. conservation of electric charge

3. neither conservation of energy nor electric charge

4. conservation of electrical charge and energy respectively

Displacement current is always :

1. greater than conduction current

2. equal to conduction current

3. less than conduction current

4. the sum of current due to flow of positive and negative ions

The energy equivalent to one atomic mass unit is :

1. 931 MeV

2. 6.02 × 10²³ J

3. 1.6 × 10^-19 J

4. 9.31 MeV

When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:

1. unpolarised

2. partially plane polarised

3. None of the above

4. completely plane polarised

if an electric dipole is kept in a uniform electric field then resultant electric force on it is :

1. depend upon capacity of dipole

2. always zero

3. never zero

4. None

Which of the following has higher magnetic susceptibility?

1. paramagnetic

2. diamagnetic

3. ferromagnetic

4. None of these

Transmutation of nuclei was discovered by:

1. Becquerel

2. Rutherford

3. None of these

4. Pauli

Increase in frequency deviation results into:

1. increase in noise of FM receiver

2. decrease in noise of FM receiver

3. decrease in noise of AM receiver

4. increase in noise of Am receiver

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

1. l

2. 1

3. ω²L

4. ω²LC

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. 1/2 Ω

2. 2/3 Ω

3. 3/2 Ω

4. 1/3 Ω

If two conducting sphere are connected after charging separately then:

1. Electrostatic energy charges remains conserved

2. Electrostatic energy energy and charge remains conserved

3. Electrostatic energy sphere energy will remain conserved

4. None

The dimensional representation of cu will be :

1. [ML^-2T ]

2. [M^-1L^-3T⁴A²]

3. [MLT⁴ A²]

4. None of these

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. 1/√3

2. √3

3. 1/3

4. 3

Electromagnetic waves have a speed of

1. 3 × 10⁶ kms^-1

2. 3 × 10⁵ kms^-1

3. 3 × 10⁷ kms^-1

4. 3 × 10⁸ kms^-1

In reverse biasing:

1. large amount of current flows

2. depletion layer resistance increases

3. no current flows

4. potential barrier across junction increases

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

1. decreases

2. increases

3. first decreases then increases

4. remain unchanged

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

Energy bands in solids are a consequence of:

1. Pauli’s exclusion principle

2. Heisenberg’s uncertainty principle

3. Bohr’s theory

4. Ohm’s Law

Which of the following cannot be polarised?

1. sound waves

2. radiowaves

3. X-rays

4. transverse waves

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 do not emit light of the same wavelength

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

4. The two sources emit light waves of different amplitudes

Semiconductors of both p-type and n-type are produced by:

1. metallic solids

2. ionic solids

3. molecular solids

4. covalent solids

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

1. π

2. π/4

3. π/2

4. 2π

Ampere’s circuital law was modified by:

1. Hertz

2. Laplace

3. Gauss

4. Maxwell

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

1. number of turns

2. magnetic field

3. None of these

4. area of a coil

The ground state energy of Hydrogen atom is -13.6 eV. What is the potential energy of electron in this state?

1. 2 eV

2. 0 eV

3. -27.2 eV

4. -13.6 eV

The magnetic lines of force inside a bar magnet:

1. do not exist

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

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

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

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

1. phosphorus

2. aluminium

3. oxygen

4. germanium

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. B/4

3. 2B

4. B/2

A bird sitting on a high power line:

1. gets killed instantly

2. is not affected practically

3. gets a mild shock

4. gets a fatal shock

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

1. None of these

2. parabola

3. straight line

4. hyperbola

When light travels from one medium to another, which of the following does not change?

1. refractive index

2. velocity

3. wavelength

4. frequency

Which of the following EMW has highest wavelength?

1. X-ray

2. ultraviolet rays

3. microwaves

4. infrared rays

Transformer works on the principle of:

1. convertor

2. mutual induction

3. invertor

4. self-induction

Two sources of light are said to be coherent when both give out light waves of the same:

1. wavelengspeedth and a constant phase difference

2. intensity and wavelength

3. amplitude and phase

4. speed

Communication channel consists of:

1. free space only

2. All

3. transmission line only

4. optical fibre only

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. 80%

2. 11%

3. 50%

4. 90%

The resistance of a human body is about:

1. 120 Ω

2. 120 MΩ

3. 12 Ω

4. 12 KΩ

A magnetic dipole moment is a vector quantity directed from:

1. W to E

2. E to W

3. N to S

4. S to N

What happens if one of the slits, say S₁ in Young’s double , slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?

1. The bright fringes become brighter and the dark fringes become darker

2. No fringes will be observed

3. The bright fringes become less-bright and the dark fringes have a finite light intensity

4. The fringe width decreases

The total energy that will be released if a nucleus is built from its constituents is called the:

1. binding energy of the solid

2. binding energy of the nucleus

3. binding energy of the atom

4. None of these

EMW are produced by:

1. charge at rest only

2. all

3. accelerated or decelerated charge only

4. charge in uniform motion only

The velocity of electromagnetic wave is:

1. 3 × 10¹⁰ ms^-1

2. 3 × 10⁶ ms^-1

3. 3 × 10⁸ ms^-1

4. 3 × 10⁵ ms^-1

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

1. communication

2. amplification

3. remote sensing

4. modulation

The dimensional formula of L/R is similar to that of:

1. none of these

2. time

3. frequency

4. length

Light Year is the unit of:

1. time

2. distance

3. energy

4. intensity of light

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

1. slightly more than 1

2. infinite

3. Zero

4. 1

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

1. charge

2. energy

3. force

4. momentum

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

1. Wavelength is doubled and the frequency become half

2. Wavelength is doubled and the frequency remains unchanged

3. Wavelength is halved and the frequency remains unchanged

4. Wavelength and frequency both remain unchanged

A parrot comes and sits on a bare high power line. It will:

1. get killed instantaneously

2. not be affected practically

3. experience a strong shock

4. experience a mild shock

The work done in rotating an electric dipole in an electric field:

1. W = ME (1 – cos θ)

2. None

3. W = ME sec θ

4. W = ME tan θ

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

1. 15 V

2. 960 V

3. 180 V

4. 120 V

According to Bohr’s theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:

1. r_g ∝ n²

2. r_g ∝ 1/n2

3. r_g ∝ n

4. r_g ∝ 1/n

Artificial radioactivity was discovered by:

1. Joliot

2. Becquerel

3. None of these

4. Pauli

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

1. of the same intensity

2. of the same amplitude

3. None of these

4. having a constant phase difference

The branch of optics dealing with the formation of images using the concept of straight line propagation of light is called:

1. corpuscular optics

2. quantum optics

3. geometrical optics

4. physical optics

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

1. the external magnetic field

2. the radius of the coil

3. the number of turns of the coil

4. all the above

Which of the following radiations cannot eject photo electrons?

1. X-rays

2. ultraviolet

3. infrared

4. visible

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

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. Diffraction fringes become broader and farther apart

2. The diffraction pattern disappear

3. Diffraction fringes become narrower and crowded

4. There is no change in diffraction pattern

The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

1. 2.4 µJ

2. 1.8 µJ

3. 1.8 J

4. 2.4 J

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

1. zinc

2. None of these

3. aluminium

4. copper

What is the angle of dip at a place where the horizontal component of earth’s magnetic field is equal to the vertical component?

1. 0°

2. 90°

3. 45°

4. 30°

hen placed in a uniform field, a dipole experiences:

1. a torque

2. a net force

3. neither a net force nor a torque

4. both a net force and torque

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. Solid sphere

3. None of these

4. Both will have an equal charge

Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor ?

1. 48 V

2. zero

3. 60 V

4. 72 V

The audio frequencies range from:

1. None of these

2. 20 Hz to 20.000 kHz

3. 20 Hz to 20 kHz

4. 20 kHz to 20.000 kHz

Tangent law is applicable only when:

1. two magnetic fields exist

2. two uniform and mutually perpendicular magnetic fields exist

3. horizontal component of earth’s magnetic field is present

4. uniform magnetic field are used

For germanium crystal, the forbidden energy gap in joules

1. 1.6 × 10^-19

2. 1.76 × 10^-19

3. 1.216 × 10^-19

4. zero

S.I. unit of flux is :

1. None

2. Tesla

3. Ohm

4. Weber

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

1. π/2

2. zero

3. π

4. π/4

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

1. Neil Armstrong, 1969

2. James Van A lien, 1971

3. None of these

4. Leonov, 1965

The phase difference b/w the A.C. and e.m.f. π/2 Which of the following can not be the instituent of the circuit?

1. RL

2. C alone

3. L alone

4. LC

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

1. It can travel through vacuum

2. It has a finite speed

3. It requires a material medium for its propagation

4. It involve transportation energy

Displacement current is due to:

1. the ionization of atmosphere

2. the Varying electric field

3. the flow of protons

4. the flow of electrons

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

1. none of these

2. area of cross section

3. number of turns

4. magnetic field

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

1. 6.25 × 10¹⁹

2. 6.25 × 10¹⁸

3. 6.25 × 10¹⁷

4. 6.25 × 10¹⁶

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

1. 5

2. 4

3. 3

4. 6

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

1. through space

2. by superimposing it on undamped electro-magnetic waves

3. through wires

4. by superimposing it on damped electro-magnetic waves

Choose the SI unit of electric potential energy :

1. Coulomb

2. Newton per coulomb

3. Erg

4. Joule

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

1. tesla

2. weber/metre²

3. gauss

4. oersted

Who undertook the first space walk and in which year?

1. Rakesh Sharma. 1998

2. None of these

3. Leonov 1965

4. Neil Armstrong, 1969

On applying reverse bias to a junction diode, it:

1. raise the potential barrier

2. lowers the potential barrier

3. increases the minority carrier current

4. increases the majority carrier current

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

1. HUF

2. UHF

3. VHF

4. MF

Which of the following has a low value in ferrites?

1. All

2. Conductivity

3. Magnetic susceptibility

4. Permeability

The angle of minimum deviation of a prism depends upon the aggie of:

1. reflection

2. prism

3. none of these

4. incidence

Your score is

CLASS 11 FULL PHYSICS

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

for more new questions refresh this page !!

The force required to produce an acceleration of 2 m/s² on a mass of 2 kg is

1. 18 N

2. 10 N

3. 4 N

4. 22 N

To demonstrate the phenomenon of beats we need

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

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

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

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

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. 19.6 m/sec²

2. 4.9 m/sec²

3. 2.45 m/sec²

4. 9.8 m/sec²

What is the dimensional formula of magnetic field?

1. M-1LTA-2

2. MT-2A-1

3. MT-1A-2

4. M-1L-2TA-1

One radian is equal to?

1. 57.7o

2. 59.3o

3. 53.7o

4. 57.3o

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

1. 5 cm

2. 2.5 cm

3. 20 cm

4. 10 cm

The process of heat transfer in which heat is transferred with actual migration of medium particles is known as (AFMC-94)

1. Conduction

2. Convection

3. Radiation

4. Reflection

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. L/2

2. 2 L

3. 4 L

4. L/4

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. frictional force

2. real force

3. Gravitational force

4. fictitious force or pseudo force

According to kinetic theory of gases, at absolute zero of temperature
(a)
(b)
(c) (d)

1. Molecular motion stops

2. Liquid helium freezes

3. Water freezes

4. Liquid hydrogen freezes

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. 1.5 km/h

2. 2 km/h

3. 3 km/h

4. zero

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. decrease by 2%

4. increase by 2%

The escape velocity for a body projected vertically upwards from the surface of the earth is 11 km/s. If the body is projected at an angle of 450 with the vertical, the escape velocity will be

1. 2 km/s

2. 11√2 km/s

3. 11/√2 km/s

4. 11 km/s

Loudness of a note of sound is

1. Directly proportional to square of velocity of the wave

2. Directly proportional to square of amplitude of wave

3. Directly proportional to amplitude of the wave

4. Directly proportional to velocity of the wave

Unit of Stefans constant is given by

1. W/ m² K²

2. W/ m K²

3. W/ mK

4. W²/ m² K4

When the angle of contact between a solid and a liquid is 90°, then

1. Cohesive force < Adhesive force

2. Cohesive force = Adhesive force

3. Cohesive force > Adhesive force

4. Cohesive force >> Adhesive force

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

1. 20 N

2. 30 N

3. 40 N

4. 19.6 N

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?

1. Rotational kinetic energy

2. Moment of inertia

3. Angular momentum

4. Angular velocity

A particle moves on a circular path with decreasing speed. Choose the correct statement.

1. Particle moves on a spiral path with decreasing radius

2. Acceleration is towards the centre

3. The direction of angular momentum remains constant

4. Angular momentum remains constant

Atomic and molecular phenomena are dealt with by

1. Quantum Mechanics

2. applied Mechanics

3. fluid Mechanics

4. Newtonian Mechanics

When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is

1. 150

2. 300

3. 100

4. 50

In damped oscillation the directions of the restoring force and the resistive force

1. have no relation with each other

2. are opposite

3. may be same or opposite

4. are the same

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. 1 : 1

3. 5 : 3

4. 5 : 7

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

1. 104 newton/m²

2. 105 newton/m²

3. 106 newton/m²

4. 103 newton/m²

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. 90°

2. 0.09°

3. 9°

4. 0.9°

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. 0.1

2. 0.001

3. 0.02

4. 0.2

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. 3 s

2. 4 s

3. 1 s

4. 2 s

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. (6/7) mgR

2. (5/6) mgR

3. (7/8) mgR

4. (8/9) mgR

The dimensional formula for speed is

1. L^-1T

2. T^-1

3. LT^-1

4. L^-1T^-1

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

1. Liquid hydrogen freezes

2. Molecular motion stops

3. Water freezes

4. Liquid helium freezes

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

1. has an outward radial acceleration

2. has no acceleration

3. has constant velocity

4. has an inward acceleration

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

A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is

1. E0

2. 2E0

3. -E0

4. 1.5 E0

Electric generator works on the scientific principle

1. Electromagnetic Induction

2. Bernoulli’s Theorem

3. Nuclear Fusion

4. Laws of Thermodynamics

For which of the following process, the thermal conduction is maximum?

1. Combustion

2. Conduction

3. Radiation

4. Convection

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. 62°C

2. 124°C

3. 37°C

4. 99°C

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

1. 1/𝝅

2. 𝝅

3. 2𝝅

4. 4

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. 0.25 km/s

2. 6 km/s

3. 0.75 km/s

4. 0.5 km/s

If a hole is bored along the diameter of the earth and a stone is dropped into the hole

1. The stone executes simple harmonic motion about the centre of the earth

2. The stone reaches the other side of the earth and escapes into space

3. The stone reaches the centre of the earth and stops there

4. The stone reaches the other side of the earth and stops there

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

1. Increases

2. Is infinite

3. Remains unchanged

4. May decrease or increase depending upon size

Theory of relativity was discovered by

1. Maxwell

2. Einstein

3. Faraday

4. Pauli

A particle moves on a circular path with decreasing speed. Choose the correct statement.

1. Angular momentum remains constant

2. Acceleration is towards the centre

3. Particle moves on a spiral path with decreasing radius

4. The direction of angular momentum remains constant

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 Youngs modulus

3. Elongation is directly proportional to cross section A

4. Elongation is inversely proportional to A

A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is ?

1. 125 J

2. 1000 J

3. 25 J

4. 1250 J

Energy is not carried by

1. Electromagnetic waves

2. Transverse progressive waves

3. Stationary wave

4. Longitudinal progressive waves

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. 1g J

2. 5g J

3. 10g J

4. Zero

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

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

2. Internal energy and entropy are state functions

3. The internal energy changes in all processes

4. The change in entropy can never be zero

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. 2.5

3. 1.5

4. 3

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. 1 : 6 : 9 : 16

2. 4 : 3 : 2 : 1

3. 1 : 4 : 9 : 16

4. 1 : 2 : 3 : 4

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 an attractive force between the molecules

4. There is no force between the molecules

A body is moving along a circle with an increasing speed. It possesses?

1. No acceleration

2. both tangential and centripetal acceleration (ar and ac)

3. centripetal acceleration only (ac)

4. tangential acceleration only (ar)

The physical sciences deal with the study of:

1. Non-living things

2. Living things

3. Both

4. None

Which of the following technology uses Newton’s second and third laws of motion

1. Electric Generator

2. Rocket Propulsion

3. None

4. Radio and Television

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. 6 s

2. 5 s

3. 20 s

4. 10 s

The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as

1. Shearing strain

2. Poissons ratio

3. Lateral strain

4. Youngs modulus

Absorptive power of perfectly black body is

1. One

2. Constant

3. Infinity

4. Zero

Longitudinal strain is possible in the case of

1. Liquid

2. Only gases & liquids

3. Only solids

4. Gases

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

1. 0.4 m

2. 0.36 m

3. 0.6 m

4. 1 m

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. -100 J

3. 392 J

4. 60 J

Who among the following first gave the experimental velocity of G?

1. Brook Taylor

2. Cavendish

3. none of these

4. Copernicus

Real gases show mark able deviation from that of ideal gas behavior at

1. Low temperature and high pressure

2. High temperature and high pressure

3. Low temperature and low pressure

4. High temperature and low pressure

If I, a and t are the moment of inertia, angular acceleration and torque respectively of a body rotating about any axis with angular velocity w, then

1. a = Iw

2. t = Ia

3. I = tw

4. t = Iw

The frequency of the note produced by plucking a given string increases as

1. The tension in the string increases

2. The length of the string increases

3. The tension in the string decreases

4. The mass per unit length of the string increases

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

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. 1 mm

2. 3 mm

3. 4 mm

4. 1 cm

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

1. the outer wheel which leaves the ground first

2. the inner 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 bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then

1. t1 – t2 = t3

2. t1 < t2 < t3

3. t1 < t2 > t3

4. t1 > t2 > t3

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. 600

2. 300

3. 450

4. 0

Physical quantities are

1. quantities such as degrees, radians and steradians

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 pounds, dollars and rupees

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. 64 m³

2. 196 m³

3. 216 m³

4. 512 m³

Atomicity of charge was discovered by

1. R.A. Millikan

2. Maxwell

3. Marie Curie

4. Faraday

Electron volt is a unit of

1. energy

2. charge

3. magnetic force

4. potential difference

The moment of inertia of a uniform semicircular disc of mass M and radius about a line perpendicular to the plane of the disc through the centre is

1. (2/5) Mr²

2. Mr²

3. (1/2) Mr²

4. (1/4) Mr power 2

Out of the basic forces , gravitational force

1. ranks second in strength

2. ranks first in strength

3. ranks fourth in strength

4. ranks third in strength

The equation of wave traveling along string is y = 3 cos p (100t – x) in C.G.S. unit then wavelength is

1. 2 cm

2. None of above

3. 1 m

4. 5 cm

At critical temperature, the surface tension of a liquid

1. Is infinity

2. Can not be determined

3. Is zero

4. Is the same as that at any other temperature

The path followed by a projectile is called its?

1. Trajectory

2. Territory

3. Tractor

4. Treasury

The aeroplane works on the scientific principle

1. Nuclear Fusion

2. Laws of Thermodynamics

3. Electromagnetic Induction

4. Bernoulli’s Theorem

Physics is a

1. Engineering Science

2. Applied Science

3. Natural Science

4. Mathematical Science

The dimensional formula for acceleration is

1. [L²T²]

2. [LT²]

3. [L²T]

4. [LT^-2]

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

1. Negative

2. may be positive or negative

3. Zero

4. Positive

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

1. 365 days

2. 730 days

3. 129 days

4. 1032 days

A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is

1. 6 s

2. 8 s

3. 4 s

4. 3 s

The M.I. of uniform circular disc about a diameter is I. its M.I. about an axis perpendicular to its plane passing through a point on its rim will be

1. 8 I

2. 4 I

3. 6 I

4. 9 I

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. 60 J

3. 392 J

4. -100 J

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

1. total mechanical energy remains constant

2. angular momentum remains constant

3. angular velocity remains constant

4. linear momentum remains constant

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

1. 10%

2. 21%

3. 20%

4. 40%

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

1. Four times the value at 200 K

2. Half the value at 200 K

3. Double the value at 200 K

4. Same as at 200 K

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. 1 : 2

3. 4 : 1

4. 2 : 1

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. normal to the surface upwards

2. opposite to the direction of the applied force

3. normal to the surface downwards

4. along the direction of the applied force

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio.

1. 5 : 3

2. 1 : 2

3. 3 : 5

4. 2 : 1

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. 6 s

2. 12 s

3. 10 s

4. 9 s

ML-1T -2 is the dimensional formula of

1. self-inductance

2. electric field

3. electric potential

4. magnetic induction

A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?

1. 5 mm²

2. 2 mm²

3. 3 mm²

4. 4 mm²

The centripetal component of acceleration arises when?

1. The direction propagation is changed

2. The direction of projectile is changed

3. The direction of motion is changed

4. The direction of gravity is changed

Spring is pulled down by 2 cm. What is amplitude of motion?

1. 0 cm

2. 6 cm

3. 1 cm

4. 2 cm

A body travels along the circumference of a circle of radius 2 m with a linear velocity of 6 m/s . Then its angular velocity is

1. 6 rad/s

2. 2 rad/s

3. 4 rad/s

4. 3 rad/s

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. 260 Hz

2. 300 Hz

3. 320 Hz

4. 280 Hz

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 gravitational mass

2. the inertial mass

3. the internal mass

4. the electromagnetic mass

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

1. Formulation of a question

2. Formulating a hypothesis

3. Building a theory

4. Analysis of test results

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.