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Physics Viva Questions Class 11. We covered all the Physics Viva Questions Class 11 in this post for free so that you can practice well for the exam.

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Physics Viva Questions Class 11 MCQs for Students

A Carnot engine has an efficiency of 20%. The energy is supplied to the engine at the rate of 2 kW. What is the output power of the engine?

(A) 300 W

(B) 400 W

(D) 600 W

Option b – 400 W

For a Carnot engine, the source and the sink temperatures are 527 °C and 47 °C respectively and the engine extracts 800 J of heat in each cycle. What is the area enclosed by the P-V diagram in terms of energy units?

(A) 280 J

(B) 350 J

(D) 600 J

Option c – 480 J

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

(A) 225 K

(B) 250 K

(D) 350 K

Option b – 250 K

Even the Carnot engine cannot give 100% efficiency because we cannot :

(A) reach absolute zero temperature

(B) find ideal sources

(D) prevent radiation

Option a – reach absolute zero temperature

An ideal Carnot engine, whose efficiency is 40%, receives heat from the source at 500 K. The efficiency is to increase to 50% by keeping the same temperature of the sink. What should be the temperature of the source?

(A) 600 K

(B) 800 K

(D) 900 K

Option a – 600 K

Which statement is incorrect?

(A) Carnot cycle has the maximum efficiency in all cycles

(B) Carnot cycle is a reversible one

(D) All reversible cycles have the same efficiency

Option d – All reversible cycles have the same efficiency

A Carnot engine takes in heat from a reservoir of heat at 427 °C and gives out heat to the sink at 77 °C. How many calories per second must it take from the reservoir in order to produce useful mechanical work at the rate of 357 W?

(A) 150 cal/s

(B) 160 cal/s

(D) 180 cal/s

Option c – 170 cal/s

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an of efficiency 60%. Then, the intake engine temperature for the same exhaust (sink) temperature must be :

(A) 600 K

(B) 750 K

(D) Efficiency of the Carnot engine cannot be made larger than 50%

Option b – 750 K

A good conductor while carrying current is –

(a) Electrically neutral

(b) Positively charged

(d) Alternately charged positive and negative

Option c – Negatively charged

The device which transfers the signal from low resistance region to high resistance region is –

(a) Transistor

(b) Inductor

(d) Capacitor

Option a – Transistor

Which of the following is arranged in order of decreasing conductivity?

(a) Copper, silver, aluminium, steel

(b) Copper, aluminium, steel, silver

(d) Aluminium, silver, copper, steel

Option c – Silver, copper, aluminium, steel

In a diesel engine, the temperature needed to ignite the fuel is achieved by –

(a) The battery

(b) An electric spark

(d) Compressing air in the cylinders

Option d – Compressing air in the cylinders

Which of the following is an optical illusion?

(a) Mirage

(b) Rainbow

(d) Earthshine

Option a – Mirage

Forged documents are detected by –

(a) Gamma rays

(b) Beta rays

(d) Infra-red rays

Option c – Ultra violet rays

Myopia is the same as –

(a) Long sightedness

(b) Astigmatism

(d) Near sightedness

Option d – Near sightedness

A microscope used in pathological laboratories forms –

(a) Magnified, virtual, and inverted image

(b) Diminished, real, and erect image

(d) Diminished, virtual, and erect image

Option a – Magnified, virtual, and inverted image

The light rays used for eliminating bacteria –

(a) X-rays

(b) Ultra violet radiation

(d) Infrared rays

Option b – Ultra violet radiation

Instrument used to study the behavior of vibrating string is –

(a) Sonometer

(b) Hydrometer

(d) Hygrometer

Option a – Sonometer

The laser is a beam of radiation which are –

(a) Coherent and monochromatic

(b) Coherent and non-monochromatic

(d) Non-coherent and monochromatic

Option a – Coherent and monochromatic

A piece of wood is held under water. The upthrust on it will be-

(a) Less than the weight of the wood

(b) Zero

(d) Equal to the weight of the wood

Option a – Less than the weight of the wood

The material used in the fabrication of a transistor is –

(a) Silver

(b) Copper

(d) Aluminium

Option c – Silicon

Which one of the following has the highest value of specific heat?

(a) Water

(b) Lead

(d) Glass

Option a – Water

Ocean currents are an example of –

(a) Conduction

(b) Convection

(d) Radiation

Option b – Convection

The earth wire of a cable is connected to –

(a) The outer metallic body of the appliance

(b) The fuse of the appliance

(d) The filament of the appliance

Option b – The fuse of the appliance

A device which is used to limit the current in an electric circuit is called a –

(a) Grid

(b) Fuse

(d) Hub

Option b – Fuse

Water is used in car radiators because of its –

(a) Low density

(b) Low boiling point

(d) Easy availability

Option c – High specific heat capacity

Which of the following is not a part of a CRT?

(a) Electron gun

(b) Gas Plasma

(d) Shadow mask

Option b – Gas Plasma

Relative humidity is expressed as –

(a) Percentage

(b) Grams

(d) Ratio

Option a – Percentage

In a railway track, two rails are joined end to end with a gap in between them because –

(a) Air-gaps are necessary for bearing the weight of the running train

(b) Steel can be saved

(d) Accidents due to contraction in winter can be avoided

Option c – Accidents due to expansion in summer can be avoided

In an MRI machine, which one of the following is used?

(a) X-ray

(b) Magnetic wave

(d) Ultrasound wave

Option b – Magnetic wave

Lambert’s law is related to –

(a) Interference

(b) Reflection

(d) Illumination

Option d – Illumination

Good conductor of electricity is –

(a) Paper

(b) Dry air

(d) Kerosene

Option c – Graphite

‘Cryogenics’ is a science dealing with –

(a) Low temperature

(b) High temperature

(d) Friction and wear

Option a – Low temperature

Fleming’s right-hand rule is used to find the direction of the –

(a) Direct current

(b) Alternate current

(d) Induced current

Option d – Induced current

A person is hurt on kicking a stone due to –

(a) Velocity

(b) Inertia

(d) Momentum

Option c – Reaction

Curie point is the temperature at which-

(a) A metal loses conductivity

(b) A metal loses magnetic property

(d) Transmutation of metal occurs

Option b – A metal loses magnetic property

When a bar magnet is cut into two equal halves, the pole strength of each piece –

(a) Becomes zero

(b) Remains the same

(d) Becomes double

Option b – Remains the same

Lightning is caused due to-

(a) Electric power

(b) Electric pressure

(d) Electric discharge

Option d – Electric discharge

The method of magnetization is –

(a) Heating a magnet

(b) Hammering a magnet

(d) Passing direct current through it

Option b – Hammering a magnet

In the remote control of television, the electromagnetic waves used are –

(a) Microwave

(b) Radio wave

(d) Infrared

Option d – Infrared

Persistence of vision is the principle behind –

(a) Cinema

(b) Camera

(d) Binocular

Option a – Cinema

On which of the following techniques does a photocopy machine work?

(a) Electrostatic image-making

(b) Thermal image-making

(d) Electromagnetic image-making

Option a – Electrostatic image-making

While catching a ball, a player pulls down his hands to lower the-

(a) Force

(b) Impulse

(d) Momentum

Option d – Momentum

For which of the following is a diode used –

(a) Purification

(b) Modulation

(d) Amplification

Option a – Purification

The radiant energy having the lowest energy is –

(a) Gamma rays

(b) Microwave radiation

(d) Visible light

Option b – Microwave radiation

The best conductor of heat among the following is –

(a) Water

(b) Alcohol

(d) Ether

Option c – Mercury

Which of the following is used to split white light into different colours?

(a) Prism

(b) Glass slab

(d) Concave lens

Option a – Prism

What is the colour of light related to?

(a) Velocity

(b) Frequency

(d) Quality

Option c – Amplitude

Electron microscope was invented by –

(a) C. P. Swanson

(b) Robert Koch

(d) Leeuwenhoek

Option c – Knoll and Ruska

Curie is a unit of –

(a) Heat

(b) Energy

(d) Radioactivity

Option d – Radioactivity

Longitudinal waves cannot travel through –

(a) Vacuum

(b) Gas

(d) Liquid

Option a – Vacuum

Diopter is the unit of –

(a) Sound intensity

(b) Light intensity

(d) Focal length of a lens

Option c – Power of a lens

The fourth state of matter is known as –

(a) Gas

(b) Vapour

(d) Plasma

Option d – Plasma

An instrument used to measure humidity is –

(a) Thermometer

(b) Hygrometer

(d) Anemometer

Option b – Hygrometer

The sensitivity of the human eye is maximum to the –

(a) Green region

(b) Blue region

(d) Red region

Option a – Green region

Hydraulic machines work under the principle of –

(a) Joule’s law

(b) Pascal’s law

(d) Newton’s law

Option b – Pascal’s law

A magnifying glass is basically –

(a) Concave lens

(b) Convex lens

(d) Plano-concave lens

Option b – Convex lens

The best material for the core of a transformer is –

(a) Stainless steel

(b) Hard steel

(d) Mild steel

Option c – Soft steel

The temperature which has the same reading on both Fahrenheit and Celsius scales is –

(a) 34

(b) 140

(d) 45

Option c – 40

The shape of our Milky Way Galaxy is –

(a) Spiral

(b) Circular

(d) None of these

Option a – Spiral

A multimeter is used to measure –

(a) Voltage

(b) Resistance

(d) All of these

Option d – All of these

Which of the following gives the direction of motion of a particle at any given instant?

(a) Phase

(b) Loudness

(d) Frequency

Option c – Velocity

The air becomes heated by –

(a) Convection

(b) Isolation

(d) Conduction

Option c – Radiation

Which of the following is associated with the Doppler Effect?

(a) Heat

(b) Light

(d) Sound

Option d – Sound

Which of the following is a scalar quantity?

(a) Force

(b) Electric potential

(d) Magnetic intensity

Option b – Electric potential

Which of the following is the best thermal conductor?

(a) Aluminium

(b) Glass

(d) Silver

Option d – Silver

Cream gets separated out of milk when it is churned because of –

(a) Gravitational force

(b) Centrifugal force

(d) Centripetal force

Option b – Centrifugal force

In which of the following is Newton’s Third law of motion utilized?

(a) Space Rocket

(b) Kite flying

(d) Internal combustion engine

Option a – Space Rocket

The property of a body by virtue of which it tends to remain in its state of rest or motion is –

(a) Energy

(b) Inertia

(d) Moment

Option b – Inertia

The S.I. unit of electric charge is –

(a) Coulomb

(b) Kelvin

(d) E.S.U

Option a – Coulomb

Electric current in a metal wire is due to the flow of –

(a) Ions

(b) Protons

(d) Electrons

Option d – Electrons

Electricity is transmitted over long distances because –

(a) It is safer

(b) It is fast

(d) There is less wastage of energy

Option d – There is less wastage of energy

A decibel is –

(a) A musical note

(b) A musical instrument

(d) A measure of sound level

Option d – A measure of sound level

Which among the following is the fundamental quantity?

(a) Force

(b) Time

(d) Velocity

Option b – Time

Which of the following is not a vector quantity?

(a) Torque

(b) Speed

(d) Velocity

Option b – Speed

The device used to convert solar energy into electricity is –

(a) Galvanic Cell

(b) Daniell Cell

(d) Electrochemical Cell

Option c – Photovoltaic Cell

Ohm’s law is valid in case of –

(a) Insulator

(b) Semiconductor

(d) Superconductor

Option c – Conductor

A liquid disturbed by stirring comes to rest due to –

(a) Surface tension

(b) Density

(d) Centripetal force

Option c – Viscosity

Pitch of Sound depends on –

(a) Amplitude

(b) Frequency

(d) Intensity

Option b – Frequency

Heat stored in water vapour is –

(a) Latent heat

(b) Relative heat

(d) Specific heat

Option a – Latent heat

Small bubbles are perfectly spherical because of –

(a) Pressure

(b) Viscosity

(d) Surface tension

Option d – Surface tension

The spreading of scent in a room follows the law of –

(a) Convection

(b) Radiation

(d) Diffusion

Option a – Convection

Sound travels fastest in –

(a) Vacuum

(b) Water

(d) Air

Option c – Steel

Which of the following phenomena produces the colours in soap bubbles?

(a) Reflection

(b) Diffraction

(d) Interference

Option d – Interference

A well-cut diamond shines brightly because –

(a) It emits light

(b) Of total internal reflection

(d) Of irregular reflection

Option b – Of total internal reflection

What is the magnetism at the centre of a bar magnet?

(a) Zero

(b) Minimum

(d) Unknown

Option a – Zero

Cylindrical lenses are used to correct –

(a) Colour blindness

(b) Myopia

(d) Hypermetropia

Option c – Astigmatism

Purity of a metal can be determined by –

(a) Conservation of mass principle

(b) Boyle’s law

(d) Archimedes Principle

Option d – Archimedes Principle

Which of the following does not have any effect on the velocity of sound?

(a) Temperature

(b) Pressure

(d) Humidity

Option d – Humidity

The sky appears blue due to –

(a) Mie Scattering

(b) Back Scattering

(d) None of these

Option c – Rayleigh Scattering

The energy stored in a watch spring is –

(a) Heat energy

(b) Kinetic energy

(d) Potential energy

Option d – Potential energy

Red light is used for signals because it has –

(a) High frequency

(b) High intensity

(d) Low refraction in the medium

Option d – Low refraction in the medium

A Periscope works on the principle of –

(a) Reflection

(b) Refraction

(d) Total internal reflection

Option d – Total internal reflection

Newton’s First law is also called as –

(a) Law of inertia

(b) Law of energy

(d) Law of momentum

Option a – Law of inertia

When two persons talk to each other, then sound for how much decibel is produced?

(a) 5 decibel

(b) 10 decibel

(d) 100 decibel

Option c – 30 decibel

The instrument used to measure the speed of wind is –

(a) Altimeter

(b) Dosimeter

(d) Chronometer

Option c – Anemometer

Which of the following is an example of a cantilever beam?

(a) Bridge

(b) See-saw

(d) Common balance

Option a – Bridge

The centre of gravity of a sprinter during the race lies –

(a) Ahead of his feet

(b) At the centre of the body

(d) Behind his feet

Option a – Ahead of his feet

A transformer –

(a) Converts electrical energy into mechanical energy

(b) Converts AC voltage to DC voltage

(d) Is used to decrease or increase AC voltage

Option d – Is used to decrease or increase AC voltage

Parabolic mirrors are used in –

(a) Shaving mirrors

(b) Car headlights

(d) Dentist’s mirrors

Option b – Car headlights

An instrument that records earthquakes is –

(a) Thermograph

(b) Ergograph

(d) Seismograph

Option d – Seismograph

The device used for measuring the wavelength of X-rays is –

(a) Cyclotron

(b) Mass Spectrometer

(d) Bragg spectrometer

Option d – Bragg spectrometer

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