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Class 11

Physics

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Question Answers for Class 11 Physics

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Question Answers for Class 11 Physics by Vedantu are created by experts to help you excel in your board exams. These answers cover all the key questions from the CBSE Physics syllabus and explain every concept in a simple and easy-to-understand way.

What makes Vedantu’s solutions special is their step-by-step approach, which simplifies even the toughest topics. This helps you learn better, improve your problem-solving skills, and feel more confident about your exams.

These solutions follow the CBSE curriculum closely, making them a reliable resource for thorough preparation and building a solid understanding of Physics.

Class 11 Physics Question Answers

What do you understand by 1 Pascal and 1 Newton ?How will the pressure change if contact area is doubled ?

What is the dimensional formula for viscosity ?

Definition of conventional and non conventional energy sources

Define SI unit of current

Give examples of inertia of direction with explanation

Can anyone list 10 advantages and disadvantages of friction ?

10 examples of friction in our daily life

Define Oscillatory motion ?

State the SI unit of resistance and define it

What is the SI unit of relative density and density ?

State the laws of reflection of light.

The length of one rod l1 3323cm and the other is l2 3321cm Both rods were measured with one measuring instrument with least count 0001 cm Then left l1 l2 right is

Difference between hardware and software

If \\[{{v}^{2}}={{u}^{2}}+2as\\] then \\[u=?\\]A. \\[{{v}^{2}}-2as\\]B. \\[\\pm \\sqrt{2as-{{v}^{2}}}\\]C. \\[\\pm \\sqrt{{{v}^{2}}-2as}\\]D. \\[\\pm \\sqrt{{{v}^{2}}+2as}\\]

Name the physical quantity which is measured in Decibel. $(a)$ The speed of light$(b)$ The intensity of heat$(c)$ The intensity of sound$(d)$ The frequency of radio waves

What is the SI unit of speed ? $(a){\\text{ m\/s}} \\\\(b){\\text{ cm\/s}} \\\\(c){\\text{ m\/}}{{\\text{s}}^2} \\\\(d){\\text{ cm\/}}{{\\text{s}}^2} \\\\ $

The S.I unit of pressure is pascal?${\\text{A}}{\\text{.}}$ True${\\text{B}}{\\text{.}}$ False

The first thermometer was developed by:$(a){\\text{ Joule}} \\\\(b){\\text{ Fahrenheit}} \\\\(c){\\text{ Galileo}} \\\\(d){\\text{ Watt}} \\\\ $

Which of the following is an example of uniform motion?$\\left( a \\right)$ Free falling body$\\left( b \\right)$ Motion of moon around earth$\\left( c \\right)$ A car moving with constant velocity$\\left( d \\right)$ None of these

What is the SI Unit of Pressure?(a). Atmosphere(b). Dyne\/$cm^2$ (c). Pascal(d). mm of Hg

Average velocity of a particle executing SHM in one complete vibration is:${\\text{A}}{\\text{. }}\\dfrac{{A\\omega }}{2}$${\\text{B}}{\\text{. }}A\\omega $${\\text{C}}{\\text{. }}\\dfrac{{A{\\omega ^2}}}{2}$${\\text{D}}{\\text{.}}$ zero

Kwh is the unit to measure which quantity?(a) electric energy(b) voltage(c) electric force(d) power

A B and C represents switches in ‘on’ position and A’ B’ and C’ represents them in ‘off’ position. Construct a switching circuit representing the polynomial $ABC + AB'C + A'B'C$. Using Boolean algebra prove that the given polynomial can be simplified to $C\\left( {A + B'} \\right)$. Construct an equivalent switching circuit.

A cube is shifted to a depth of 100m in a lake. The change in volume is 0.1%. The bulk modulus of the material is nearly (a) $10 Pa$(b) ${{10}^{4}}$ Pa(c) ${{10}^{7}}$ Pa(d) \\[{{10}^{9}}\\] Pa

Why are sound waves in air characterized as longitudinal?

An object of a mass M is attached to a vertical spring which slowly lowers to equilibrium position. This extends the spring x. If the same objects is attached to the same vertical spring but permitted to fall suddenly instead then the maximum extension of spring is$ {\\text{A}}{\\text{. x}} \\\\{\\text{B}}{\\text{. 2x}} \\\\{\\text{C}}{\\text{. }}\\dfrac{{\\text{x}}}{2} \\\\{\\text{D}}{\\text{. 3x}} \\\\ $

The value of g on the moon in 1\/6 th of the value of g on earth. A man can jump 1.5 m high on the earth. He can jump on the moon up to a height of:A.) 9 mB.) 7.5 mC.) 6 mD.) 4.5 m

The time period of a second’s pendulum on the surface of moon will be$A.\\dfrac{2}{{\\sqrt 6 }}s \\\\B.6\\sqrt 2 s \\\\C.2\\sqrt 6 s \\\\D.2s \\\\ $

Acceleration is defined as the rate of change of velocity. Unit of rate of change of acceleration is:$\\left( A \\right)\\dfrac{m}{{{s^2}}}$$\\left( B \\right)\\dfrac{m}{{{s^3}}}$$\\left( C \\right)\\dfrac{m}{s}$$\\left( D \\right)\\dfrac{{{m^2}}}{{{s^2}}}$

The relation between momentum(P) mass(m) Kinetic energy(KE) and velocity(V) of the body is:A. $PV = 2KE$B. $KE = \\dfrac{{{P^2}}}{{2m}}$C. ${P^2} = 2mKE$D. All of the above.

Why do we say that pressure is a scalar quantity?(a) Pressure has both magnitude and direction.(b) Pressure has magnitude but no specific direction.(c) Pressure has no magnitude and no direction.(d) Pressure has no magnitude and a specific direction.

Calculate the number of electrons which constitute one coulomb of charge.

Name the S.I. unit of heat(a). Joule (J)(b). Joule-sec (J-s)(c). Calorie (C)(d). Watt (W)

Process of change of state from solid to liquid is called:(a). Melting(b). Freezing(c). Boiling(d). Condensation

Electron volt is the unit of A. energyB. potential differenceC. chargeD. charge to mass

Fill up the blank with suitableAcceleration due to gravity independent of ________

Dimensions of impulse are \\[A.{\\text{ }}\\left[ {ML{T^{ - 1}}} \\right] \\\\B.{\\text{ }}\\left[ {ML{T^2}} \\right] \\\\C.{\\text{ }}\\left[ {M{T^{ - 2}}} \\right] \\\\D.{\\text{ }}\\left[ {M{L^{ - 1}}{T^{ - 3}}} \\right] \\\\ \\]

1 newton=_______dyne.(a). 103(b). 107(c). 105(d). 108

Dimensional formula of universal gravitational constant G is-$\\left( a \\right){M^{ - 1}}{L^3}{T^{ - 2}} \\\\\\left( b \\right){M^{ - 1}}{L^2}{T^{ - 2}} \\\\\\left( c \\right){M^{ - 2}}{L^3}{T^{ - 2}} \\\\\\left( d \\right){M^{ - 2}}{L^2}{T^{ - 2}} \\\\ $

What is the dimension of the ratio of the dimensions of Planck’s constant and that of moment of inertia?

With what minimum acceleration can a fireman slide down a rope whose breaking strength is two third of his weight?A. $\\dfrac{{\\text{g}}}{{\\text{2}}}$B. $\\dfrac{{{\\text{2g}}}}{{\\text{3}}}$C. $\\dfrac{{{\\text{3g}}}}{{\\text{2}}}$D. \\[\\dfrac{{\\text{g}}}{{\\text{3}}}\\]

Erg is a unit of:A.EnergyB.PressureC.ForceD.Velocity

If the linear momentum is increased by 50% then kinetic energy will be increased by ${\\text{A}}{\\text{. 50% }} \\\\{\\text{B}}{\\text{. 100% }} \\\\{\\text{C}}{\\text{. 125% }} \\\\{\\text{D}}{\\text{. 25% }} \\\\ $

Give reason as to why woolen clothes are more preferable in winter.

The man who is known as the father of experimental physics isA. NewtonB. Albert einsteinC. GalileoD. Rutherford

The displacement $x$ of a particle moving in one dimension under the action of a constant force is related to time $t$ by the equation $t - 3 = \\sqrt x $ where $x$ is in meter and $t$ is in second. Find the displacement of the particle when its velocity is zero.

Compute the heat generating while transferring 96000 coulombs of charge in one hour through a potential difference of 50V.

A lift of mass 1000 Kg which is moving with acceleration 1 m\/$s^2$ in upward direction then the tension developed in string which is connected to lift is:$\\left( A \\right)$ 9 800 N$\\left( B \\right)$ 10 800 N$\\left( C \\right)$ 11 000 N$\\left( D \\right)$ 10 000 N

How to identify periodic and non-periodic motion?

Work done in a free expansion process is:A.Maximum B.ZeroC.MinimumD.None of the above

The fastest mode of transfer of heat is through:A.) ConvectionB.) ConductionC.) RadiationD.) All of the above

When 1 coulomb of charge flows through a conductor in 1 sec then the current passing through the conductor is:A. 1HPB. 1AC. 1CD. 1P

What is the principal focus for concave lenses?A. It is a point on the principal axis of a concave lens from where a parallel beam of light rays parallel to the principal axis after passing through the lens appears to come.B. It is a point on the principal axis of a concave lens from where a perpendicular beam of light rays travelling parallel to the principal axis after passing through the lens appears to come.C. It is a point on the principal axis of a convex lens from where a parallel beam of light rays travelling parallel to the principal axis after passing through the lens appears to come.D. None

The specific heat of air at constant pressure is \\[1.005\\text{ kJ\/kg K}\\] and the specific heat of air at constant volume is \\[0.718\\text{ kJ\/kg K}\\]. Find the specific gas constant.(A). \\[0.287\\text{ kJ\/kg K}\\](B). \\[0.21\\text{ kJ\/kg K}\\](C). \\[0.34\\text{ kJ\/kg K}\\](D). \\[0.19\\text{ kJ\/kg K}\\]

Two vibrating tuning forks produce progressive waves given by \\[{y_1} = 4\\sin 500\\pi t\\]and \\[{y_2} = 2\\sin 506\\pi t\\]. Number of beats produced per minute is${\\text{A}}{\\text{. 360}} \\\\{\\text{B}}{\\text{. 180}} \\\\{\\text{C}}{\\text{. 3}} \\\\{\\text{D}}{\\text{. 60}} \\\\ $

The capacity to do work is called:A. EnergyB. ForceC. MotionD. Speed

If 1 mole of a monatomic gas ($\\gamma = 5\/3$) is mixed with 1 mole of a diatomic gas ($\\gamma = 7\/5$) the value of $\\gamma $ for the mixture is:A. 1.40B. 1.50C. 1.53D. 3.07

The work function of metal is in the range of \\[{\\text{2eV}}\\]to \\[{\\text{5eV}}\\]. Find which of the following wavelengths of light cannot be used for photoelectric effect. (Consider Planck constant = \\[{\\text{4}} \\times {\\text{1}}{{\\text{0}}^{ - 15}}{\\text{eVs}}\\] velocity of light = \\[3 \\times {\\text{1}}{{\\text{0}}^8}m\/s\\]).A. \\[510nm\\]B. \\[650nm\\]C. \\[400nm\\]D. \\[570nm\\]

The unit of Wien’s constant b is:A. \\[W{m^{ - 2}}{K^{ - 4}}\\]B. \\[{m^{ - 1}}{K^{ - 1}}\\]C. \\[W{m^2}\\]D. \\[mK\\]

How many electronic charges form 1 coulomb?\\[A.{\\text{ }}9.1 \\times {10^{ - 31}} \\\\B.{\\text{ }}1.6 \\times {10^{18}} \\\\C.{\\text{ }}62.5 \\times {10^{17}} \\\\D.{\\text{ }}1.76 \\times {10^{11}} \\\\ \\]

State true or false:Energy is the capacity to do work.(A). True(B). False

The temperature of the sun is measured with (a). Platinum thermometer(b). Gas thermometer(c). Pyrometer(d). Vapour pressure thermometer

A particle is moving on a circular path of 10 m radius. At any instant of time its speed is ${\\text{5m}}{{\\text{s}}^{{\\text{ - 1}}}}$ and the speed is increasing at a rate of ${\\text{2m}}{{\\text{s}}^{{\\text{ - 2}}}}$. At this instant the magnitude of the net acceleration will be nearly.A. ${\\text{3}}{\\text{.2m}}{{\\text{s}}^{{\\text{ - 2}}}}$B. ${\\text{2m}}{{\\text{s}}^{{\\text{ - 2}}}}$C. ${\\text{2}}{\\text{.5m}}{{\\text{s}}^{{\\text{ - 2}}}}$D. ${\\text{4}}{\\text{.3m}}{{\\text{s}}^{{\\text{ - 2}}}}$

What is the difference between the center of gravity and the center of mass?

Why are shockers used in scooters and cars? Explain.(A). Decreases friction(B). Increases the time of impact(C). Increases friction(D). Decorative

How do transparent objects behave with light?(A). Do not let light pass through them(B). Allow light to pass through them(C). Absorb some amount of light and allow the rest to pass through(D). Reflect all the light falling on them

Define the latent heat of vaporization.

At what height is the value of g half that on the surface of earth? (R = radius of the earth)A.) 0.414RB.) RC.) 2RD.) 3.5R

The apparent weight of a body isThis question has multiple correct optionsA. may be positive.B. may be negative.C. may be zero.D. is always positive.

An echo will be heard if the minimum distance between the source of the sound and the obstacle is$(a){\\text{ 1m}} \\\\(b){\\text{ 10m}} \\\\(c){\\text{ 15m}} \\\\(d){\\text{ 17m}} \\\\ $

Calculate the limit of resolution of a telescope objective having a diameter of 200 cm if it has to detect light of wavelength 500 nm coming from a star:\\[A.{\\text{ }}305 \\times {10^{ - 9}}{\\text{radian}} \\\\B.{\\text{ }}152.5 \\times {10^{ - 9}}{\\text{radian}} \\\\C.{\\text{ }}610 \\times {10^{ - 9}}{\\text{radian}} \\\\D.{\\text{ }}457.5 \\times {10^{ - 9}}{\\text{radian}} \\\\ \\]

A rod of length L at room temperature and uniform area of cross section A is made of a metal having a coefficient of linear expansion \\[^0C\\]. It is observed that an external compressive force F applied on each of its ends prevents any change in the length of the rod when its temperature rises by \\[\\vartriangle TK\\]. Young's modulus Y for this metal is:A.)\\[\\dfrac{F}{{2A\\alpha \\vartriangle T}}\\]B.)\\[\\dfrac{F}{{A\\alpha (\\vartriangle T - 273)}}\\]C.)\\[\\dfrac{F}{{A\\alpha \\vartriangle T}}\\]D.)\\[\\dfrac{{2F}}{{A\\alpha \\vartriangle T}}\\]

State and explain work energy principle.

One kilowatt hour is equal to:-A. $36 \\times {10^5}$ JoulesB. $36 \\times {10^3}$ JoulesC. ${10^3}$ JoulesD. ${10^5}$ Joules

Why does the cord of an electric heater not glow while the heating element does?

One volt is equal to:A. 1 JouleB. 1 Newton\/CoulombC. 1 Joule\/CoulombD. 1 Coulomb\/Newton

The radius of a ring is R and its coefficient of linear expansion is $\\alpha $. If the temperature ring increases by$\\theta $ then its circumference will increase by A. $\\pi {R^2}\\alpha \\theta $B. $2\\pi R\\theta $C. $\\pi {R^{}}\\alpha \\dfrac{\\theta }{2}$D. $\\pi {R^{}}\\alpha \\dfrac{\\theta }{4}$

A constant volume gas thermometer work on:A. Archimedes principle B. Pascal’s lawC. Boyle’s lawD. Charles lawE. Gay Lussac’s law

An insect crawls up a hemispherical surface very slowly as shown in figure. The coefficient of friction between the insect and the surface is $\\dfrac{1}{3}$. If the line joining the centre of the hemispherical surface to the insect makes an angle $\\alpha $with the vertical the maximum possible value of $\\alpha $ is given by-\n \n \n \n \n $A.{\\text{ cot}}\\alpha {\\text{ = 3}} \\\\{\\text{B. sec}}\\alpha {\\text{ = 3}} \\\\{\\text{C. cosec}}\\alpha {\\text{ = 3}} \\\\{\\text{D. none}} \\\\ $

What extinguishes a fire most quickly?(a). Cold water(b). Boiling water(c). Hot water(d). Ice

When green and red colours are mixed the colour produced is:A. YellowB. MagentaC. IndigoD. Black

There is no atmosphere on moon because(A). It is closer to earth(B). It revolves around the earth(C). It gets light for the sun(D). The escape velocity of the gas molecules is lesser than their root mean square velocity

The intermolecular space in case of liquid areA) Less than solidsB) More and gasC) More than the solids and less than the gasesD) More than the solid and gases

Velocity of sound is minimum inA. NitrogenB. HydrogenC. AirD. Carbon dioxide

Define Translatory motion.

Discuss the variation of acceleration due to gravity with depth. What happens to g at the center of the Earth.

What is meant by escape velocity? Write the relation between escape velocity and orbital velocity.

A Carnot engine has an efficiency of 1\/6. When the temperature of the sink is reduced by ${{62}^{0}}C$ its efficiency is doubled. The temperature of the source and the sink are respectively:(a). ${{124}^{0}}C \\text{ 6}{{\\text{2}}^{0}}C$(b). ${{37}^{0}}C \\text{ 9}{{\\text{9}}^{0}}C$(c). ${{62}^{0}}C \\text{ 12}{{\\text{4}}^{0}}C$(d). ${{99}^{0}}C \\text{ 3}{{\\text{7}}^{0}}C$

One unit of electric energy is equal to:A. One kilowatt hourB. One watt hourC. 100 JoulesD. None of these

Which of the following physical quantities has no unit?A. Relative densityB. DensityC. PressureD. Thrust

The dimensional formula for wavelength is equivalent to (Where E is the electric field B is the magnetic field L is Induction and C is Capacitance):\\[{\\text{A}}{\\text{.}}\\dfrac{{E\\sqrt {LC} }}{B}\\] \\[{\\text{B}}{\\text{. }}\\dfrac{E}{{B\\sqrt {LC} }}\\]\\[{\\text{C}}{\\text{.}}\\dfrac{{B\\sqrt {LC} }}{E}\\]\\[{\\text{D}}{\\text{. }}\\dfrac{B}{{E\\sqrt {LC} }}\\]

A force $\\dfrac{{m{v^2}}}{r}$ is acting on a body of mass m moving with a speed v in a circle of radius r. What is the work done by the force in moving the body over half the circumference of the circle?${\\text{A}}{\\text{. }}\\dfrac{{m{v^2}}}{r} \\times \\pi r$${\\text{B}}{\\text{.}}$ Zero${\\text{C}}{\\text{. }}\\dfrac{{m{v^2}}}{{{r^2}}}$\\[{\\text{D}}{\\text{. }}\\dfrac{{\\pi {r^2}}}{{m{v^2}}}\\]

What is the dimensional formula of dynamic viscosity?A. [${{M}^{1}}{{L}^{-1}}{{T}^{-2}}$]B. [${{M}^{1}}{{L}^{1}}{{T}^{-1}}$] C. [${{M}^{1}}{{L}^{-1}}{{T}^{-1}}$]D. [${{M}^{1}}{{L}^{1}}{{T}^{1}}$]

Mention the significance of Zeroth law.

An angiosperm is different from a gymnosperm in the absence of A. Vascular tissueB. OvaryC. SeedD. Naked ovule

Sound travels fastest in which of the following substances:(A). solids(B). liquids(C). gases(D). none of these

A ball falls on an inclined plane of inclination $\\theta $ from a height h above the point of impact and makes a perfectly elastic collision. Where will it be on the plane again?

A ship is travelling due east at 10km\/h. A ship heading 30$^\\circ $ east of north is always due north from the first ship. The speed of the second ship in km\/h is:${\\text{A}}{\\text{. }}20\\sqrt 2 \\\\{\\text{B}}{\\text{. 20}}\\sqrt {\\dfrac{3}{2}} \\\\{\\text{C}}{\\text{. 20}} \\\\{\\text{D}}{\\text{. }}\\dfrac{{20}}{{\\sqrt 2 }} \\\\ $

Refractive index of water kerosene ice and glass are 1.33 1.44 1.31 and 1.5 respectively. Arrange these in decreasing order of optical density

The density of mercury is $13.6gc{{m}^{-3}}$at \\[{{0}^{\\circ }}\\text{C}\\] and its coefficient of cubical expansion is $1.82\\times {{10}^{-4}}{{C}^{-1}}$. Calculate the density of mercury at $\\text{5}{{\\text{0}}^{\\circ }}C$.

Prepare with Vedantu’s Class 11 Physics Question Answers

Prepare better with Vedantu’s Question Answers for Class 11 Physics. These solutions cover every topic from the syllabus, with clear and simple explanations to make learning easier.

Vedantu provides step-by-step answers crafted by experts to ensure you understand concepts deeply and gain confidence for your board exams. With these trusted resources, studying Physics becomes more effective and stress-free. Let Vedantu help you achieve your academic goals and ace your exams!