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
(C) 500 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
(C) 480 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
(C) 275 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
(C) eliminate friction
(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
(C) 700 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
(C) Reversible cycle has more efficiency than an irreversible 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
(C) 170 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
(C) 1200 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
(c) Negatively 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
(c) Diode
(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
(c) Silver, copper, aluminium, steel
(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
(c) Using heat from exhaust
(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
(c) Halo
(d) Earthshine
Option a – Mirage
Forged documents are detected by –
(a) Gamma rays
(b) Beta rays
(c) Ultra violet rays
(d) Infra-red rays
Option c – Ultra violet rays
Myopia is the same as –
(a) Long sightedness
(b) Astigmatism
(c) Presbyopia
(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
(c) Magnified, virtual, 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
(c) Microwave radiation
(d) Infrared rays
Option b – Ultra violet radiation
Instrument used to study the behavior of vibrating string is –
(a) Sonometer
(b) Hydrometer
(c) Barometer
(d) Hygrometer
Option a – Sonometer
The laser is a beam of radiation which are –
(a) Coherent and monochromatic
(b) Coherent and non-monochromatic
(c) Non-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
(c) More than the weight of the wood
(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
(c) Silicon
(d) Aluminium
Option c – Silicon
Which one of the following has the highest value of specific heat?
(a) Water
(b) Lead
(c) Copper
(d) Glass
Option a – Water
Ocean currents are an example of –
(a) Conduction
(b) Convection
(c) Insulation
(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
(c) Short circuitry 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
(c) Conductor
(d) Hub
Option b – Fuse
Water is used in car radiators because of its –
(a) Low density
(b) Low boiling point
(c) High specific heat capacity
(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
(c) Phosphor screen
(d) Shadow mask
Option b – Gas Plasma
Relative humidity is expressed as –
(a) Percentage
(b) Grams
(c) Kilograms
(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
(c) Accidents due to expansion in summer can be avoided
(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
(a) Interference
(b) Reflection
(c) Refraction
(d) Illumination
Option d – Illumination
Good conductor of electricity is –
(a) Paper
(b) Dry air
(c) Graphite
(d) Kerosene
Option c – Graphite
‘Cryogenics’ is a science dealing with –
(a) Low temperature
(b) High temperature
(c) Growth of crystals
(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
(c) Actual current
(d) Induced current
Option d – Induced current
A person is hurt on kicking a stone due to –
(a) Velocity
(b) Inertia
(c) Reaction
(d) Momentum
Option c – Reaction
Curie point is the temperature at which-
(a) A metal loses conductivity
(b) A metal loses magnetic property
(c) Matter becomes radioactive
(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
(c) Becomes half
(d) Becomes double
Option b – Remains the same
Lightning is caused due to-
(a) Electric power
(b) Electric pressure
(c) Electric leakage
(d) Electric discharge
Option d – Electric discharge
The method of magnetization is –
(a) Heating a magnet
(b) Hammering a magnet
(c) Passing alternating current through it
(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
(c) Ultraviolet
(d) Infrared
Option d – Infrared
Persistence of vision is the principle behind –
(a) Cinema
(b) Camera
(c) Periscope
(d) Binocular
Option a – Cinema
On which of the following techniques does a photocopy machine work?
(a) Electrostatic image-making
(b) Thermal image-making
(c) Magnetic 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
(c) Catching time
(d) Momentum
Option d – Momentum
For which of the following is a diode used –
(a) Purification
(b) Modulation
(c) Oscillation
(d) Amplification
Option a – Purification
The radiant energy having the lowest energy is –
(a) Gamma rays
(b) Microwave radiation
(c) UV rays
(d) Visible light
Option b – Microwave radiation
The best conductor of heat among the following is –
(a) Water
(b) Alcohol
(c) Mercury
(d) Ether
Option c – Mercury
Which of the following is used to split white light into different colours?
(a) Prism
(b) Glass slab
(c) Convex lens
(d) Concave lens
Option a – Prism
(a) Velocity
(b) Frequency
(c) Amplitude
(d) Quality
Option c – Amplitude
Electron microscope was invented by –
(a) C. P. Swanson
(b) Robert Koch
(c) Knoll and Ruska
(d) Leeuwenhoek
Option c – Knoll and Ruska
Curie is a unit of –
(a) Heat
(b) Energy
(c) Temperature
(d) Radioactivity
Option d – Radioactivity
Longitudinal waves cannot travel through –
(a) Vacuum
(b) Gas
(c) Solid
(d) Liquid
Option a – Vacuum
Diopter is the unit of –
(a) Sound intensity
(b) Light intensity
(c) Power of a lens
(d) Focal length of a lens
Option c – Power of a lens
The fourth state of matter is known as –
(a) Gas
(b) Vapour
(c) Electron
(d) Plasma
Option d – Plasma
An instrument used to measure humidity is –
(a) Thermometer
(b) Hygrometer
(c) Pyrheliometer
(d) Anemometer
Option b – Hygrometer
The sensitivity of the human eye is maximum to the –
(a) Green region
(b) Blue region
(c) Violet region
(d) Red region
Option a – Green region
Hydraulic machines work under the principle of –
(a) Joule’s law
(b) Pascal’s law
(c) Floatation law
(d) Newton’s law
Option b – Pascal’s law
A magnifying glass is basically –
(a) Concave lens
(b) Convex lens
(c) Cylindrical 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
(c) Soft 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
(c) 40
(d) 45
Option c – 40
The shape of our Milky Way Galaxy is –
(a) Spiral
(b) Circular
(c) Elliptical
(d) None of these
Option a – Spiral
A multimeter is used to measure –
(a) Voltage
(b) Resistance
(c) Current
(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
(c) Velocity
(d) Frequency
Option c – Velocity
The air becomes heated by –
(a) Convection
(b) Isolation
(c) Radiation
(d) Conduction
Option c – Radiation
Which of the following is associated with the Doppler Effect?
(a) Heat
(b) Light
(c) Magnetism
(d) Sound
Option d – Sound
Which of the following is a scalar quantity?
(a) Force
(b) Electric potential
(c) Displacement
(d) Magnetic intensity
Option b – Electric potential
Which of the following is the best thermal conductor?
(a) Aluminium
(b) Glass
(c) Copper
(d) Silver
Option d – Silver
Cream gets separated out of milk when it is churned because of –
(a) Gravitational force
(b) Centrifugal force
(c) Fractional 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
(c) Archery
(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
(c) Force
(d) Moment
Option b – Inertia
The S.I. unit of electric charge is –
(a) Coulomb
(b) Kelvin
(c) Ampere
(d) E.S.U
Option a – Coulomb
Electric current in a metal wire is due to the flow of –
(a) Ions
(b) Protons
(c) Holes
(d) Electrons
Option d – Electrons
Electricity is transmitted over long distances because –
(a) It is safer
(b) It is fast
(c) It is cheaper
(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
(c) The wavelength
(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
(c) Volume
(d) Velocity
Option b – Time
Which of the following is not a vector quantity?
(a) Torque
(b) Speed
(c) Acceleration
(d) Velocity
Option b – Speed
The device used to convert solar energy into electricity is –
(a) Galvanic Cell
(b) Daniell Cell
(c) Photovoltaic Cell
(d) Electrochemical Cell
Option c – Photovoltaic Cell
Ohm’s law is valid in case of –
(a) Insulator
(b) Semiconductor
(c) Conductor
(d) Superconductor
Option c – Conductor
A liquid disturbed by stirring comes to rest due to –
(a) Surface tension
(b) Density
(c) Viscosity
(d) Centripetal force
Option c – Viscosity
Pitch of Sound depends on –
(a) Amplitude
(b) Frequency
(c) Velocity
(d) Intensity
Option b – Frequency
Heat stored in water vapour is –
(a) Latent heat
(b) Relative heat
(c) Absolute heat
(d) Specific heat
Option a – Latent heat
Small bubbles are perfectly spherical because of –
(a) Pressure
(b) Viscosity
(c) Gravity
(d) Surface tension
Option d – Surface tension
The spreading of scent in a room follows the law of –
(a) Convection
(b) Radiation
(c) Radioactivity
(d) Diffusion
Option a – Convection
Sound travels fastest in –
(a) Vacuum
(b) Water
(c) Steel
(d) Air
Option c – Steel
Which of the following phenomena produces the colours in soap bubbles?
(a) Reflection
(b) Diffraction
(c) Dispersion
(d) Interference
Option d – Interference
A well-cut diamond shines brightly because –
(a) It emits light
(b) Of total internal reflection
(c) It has many reflecting surfaces
(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
(c) Maximum
(d) Unknown
Option a – Zero
Cylindrical lenses are used to correct –
(a) Colour blindness
(b) Myopia
(c) Astigmatism
(d) Hypermetropia
Option c – Astigmatism
Purity of a metal can be determined by –
(a) Conservation of mass principle
(b) Boyle’s law
(c) Pascal’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
(c) Density
(d) Humidity
Option d – Humidity
The sky appears blue due to –
(a) Mie Scattering
(b) Back Scattering
(c) Rayleigh Scattering
(d) None of these
Option c – Rayleigh Scattering
The energy stored in a watch spring is –
(a) Heat energy
(b) Kinetic energy
(c) Chemical energy
(d) Potential energy
Option d – Potential energy
Red light is used for signals because it has –
(a) High frequency
(b) High intensity
(c) Long wavelength
(d) Low refraction in the medium
Option d – Low refraction in the medium
A Periscope works on the principle of –
(a) Reflection
(b) Refraction
(c) Diffraction
(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
(c) Law of moments
(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
(c) 30 decibel
(d) 100 decibel
Option c – 30 decibel
The instrument used to measure the speed of wind is –
(a) Altimeter
(b) Dosimeter
(c) Anemometer
(d) Chronometer
Option c – Anemometer
Which of the following is an example of a cantilever beam?
(a) Bridge
(b) See-saw
(c) Diving board
(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
(c) To the left side 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
(c) Converts DC to AC
(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
(c) Driving mirrors
(d) Dentist’s mirrors
Option b – Car headlights
An instrument that records earthquakes is –
(a) Thermograph
(b) Ergograph
(c) Ediograph
(d) Seismograph
Option d – Seismograph
The device used for measuring the wavelength of X-rays is –
(a) Cyclotron
(b) Mass Spectrometer
(c) G. M. Counter
(d) Bragg spectrometer
Option d – Bragg spectrometer
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