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Nootan Physics Class 12 Solutions PDF Free Download for Students
Cooling occurs mainly due to
(A) Movement of water
(B) Expansion of compressed gas
(C) Use of cooking gas
(D) Change of Solid into liquid
Option b – Expansion of compressed gas
Under which situation will wet clothes dry most quickly?
(A) 100% relative humidity at 60°C
(B) 100% relative humidity at 20°C
(C) 20% relative humidity at 20°C
(D) 20% relative humidity at 60°C
Option d – 20% relative humidity at 60°C
What effect does adding Salt to water produce?
(A) Rise in boiling point and fall in freezing point
(B) Fall in boiling point and rise in freezing point
(C) Reduction in both boiling and freezing points
(D) Increase in both boiling and freezing points
Option a – Rise in boiling point and fall in freezing point
When Salt is mixed with water, the boiling point and freezing point respectively
(A) Increase
(B) Decrease
(C) Decrease and increase
(D) Increase and decrease
Option d – Increase and decrease
The inner surface of a thermos flask is silvered mainly to
(A) Reduce Heat absorption
(B) Increase Heat conduction
(C) Minimise Heat loss
(D) Improve strength of the flask
Option c – Minimise Heat loss
White clothes are preferred in summer because
(A) They reflect most of the incoming Heat
(B) They emit body Heat faster
(C) They soak sweat efficiently
(D) They reduce eye strain
Option a – They reflect most of the incoming Heat
The main function of sweating is to
(A) Maintain normal body temperature
(B) Control water balance of the body
(C) Eliminate harmful substances
(D) Clean skin pores
Option a – Maintain normal body temperature
Lightning can scorch trees as it carries enormous
(A) Thermal energy
(B) Electrical energy
(C) Chemical energy
(D) Nuclear energy
Option b – Electrical energy
A fan gives a cooling sensation during hot weather because
(A) It blows cold air
(B) It speeds up evaporation of sweat
(C) It increases radiation of Heat from the body
(D) It improves air conductivity
Option b – It speeds up evaporation of sweat
Water stays cool in an earthen pot mainly due to
(A) Condensation
(B) Evaporation
(C) Sublimation
(D) Radiation
Option b – Evaporation
Two identical metal cups containing hot water are kept in places with different room temperatures. Which cup cools to room temperature first?
(A) The one kept in the warmer room
(B) The one kept in the cooler room
(C) Both cool at the same rate
(D) Cannot be determined
Option c – Both cool at the same rate
During summer, humid Heat is commonly experienced in
(A) Early summer
(B) Mid-summer
(C) Extremely dry Heat
(D) Moist weather conditions
Option d – Moist weather conditions
Xeric conditions indicate
(A) Low temperature
(B) Low moisture availability
(C) Rapid evaporation
(D) Very high temperature
Option b – Low moisture availability
We normally do not sense atmospheric pressure because
(A) Internal body pressure balances it
(B) The body is adapted to it
(C) Bones are strong enough to resist it
(D) Body surface area is very small
Option a – Internal body pressure balances it
Food cooks faster in a pressure cooker because
(A) Water boils at a lower temperature
(B) Water boils at a higher temperature
(C) Water always boils at 100°C
(D) Heat circulates rapidly inside
Option b – Water boils at a higher temperature
A pressure cooker shortens cooking time since
(A) Boiling point decreases due to pressure
(B) Air inside is completely sealed
(C) Boiling point increases under pressure
(D) Evaporation is almost prevented
Option c – Boiling point increases under pressure
The highest temperature inside a pressure cooker mainly depends on
(A) Size of the vent and the applied weight
(B) Size of the vent and the Food inside
(C) Weight and the quantity of Food
(D) Only the vent size
Option a – Size of the vent and the applied weight
When water is heated from 0°C to 10°C, its volume
(A) Increases steadily
(B) Decreases steadily
(C) Remains constant
(D) Decreases first and then increases
Option d – Decreases first and then increases
If water is cooled from 9°C to 3°C, its volume will
(A) Stay unchanged
(B) Increase and then decrease
(C) Decrease and then increase
(D) Freeze completely
Option c – Decrease and then increase
A water-filled bottle bursts on freezing because
(A) Water expands on solidifying
(B) The bottle contracts on cooling
(C) Outside temperature is higher
(D) Water expands when heated
Option a – Water expands on solidifying
A tightly sealed glass bottle breaks in a freezer because
(A) Glass contracts
(B) Water volume reduces
(C) Water volume increases
(D) Glass does not conduct heat well
Option c – Water volume increases
When ice floating in water melts, the water level
(A) Decreases
(B) Increases
(C) Remains the same
(D) Depends on the temperature of water
Option c – Remains the same
Cloudy nights tend to be warmer than clear nights because clouds
(A) Stop cold air from descending
(B) Reflect back heat emitted by the Earth
(C) Produce their own heat
(D) Absorb atmospheric heat and radiate it downward
Option b – Reflect back heat emitted by the Earth
Assertion (A): While cooking Food at high-altitude locations, Salt is commonly added. Reason (R): Higher altitudes experience lower temperatures.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option b – Both (A) and (R) are correct, but (R) does not explain (A)
Assertion (A): White clothing is preferred during winter. Reason (R): White clothing reflects heat effectively.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option d – (A) is incorrect, but (R) is correct
Assertion (A): Light-coloured clothes are commonly worn in summer. Reason (R): Light colours absorb less heat energy.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option a – Both (A) and (R) are correct, and (R) explains (A)
Assertion (A): As altitude increases, the boiling point of water decreases. Reason (R): Atmospheric pressure becomes higher with increasing altitude.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option c – (A) is correct, but (R) is incorrect
Assertion (A): The viscosity of glycerine rises when temperature increases. Reason (R): An increase in temperature raises the kinetic energy of molecules.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option d – (A) is incorrect, but (R) is correct
Assertion (A): The handle of a pressure cooker is made of ebonite. Reason (R): Ebonite is a rigid material.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option b – Both (A) and (R) are correct, but (R) does not explain (A)
Consider the following statements. 1. Steam at 100 °C and boiling water at 100 °C possess equal heat content. 2. The latent heat of fusion of ice is the same as the latent heat of vaporisation of water. 3. In an air conditioner, heat is absorbed from indoor air at the evaporator coil and expelled outside through the condenser coil. Which statement(s) is/are correct?
(A) Only 1 and 2
(B) Only 2 and 3
(C) Only 2
(D) Only 3
Option d – Only 3
Assertion (A): Woollen clothes help keep the body warm. Reason (R): Wool fibres are protein-based and conduct heat poorly.
(A) Both (A) and (R) are correct, and (R) explains (A)
(B) Both (A) and (R) are correct, but (R) does not explain (A)
(C) (A) is correct, but (R) is incorrect
(D) (A) is incorrect, but (R) is correct
Option c – (A) is correct, but (R) is incorrect
Which layer of the Atmosphere reflects radio waves?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Ionosphere
Option d – Ionosphere
Which type of wave cannot propagate through a vacuum?
(A) Light
(B) Heat
(C) sound
(D) Electromagnetic waves
Option c – sound
Long radio waves are reflected by which atmospheric layer? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Troposphere
(B) Ionosphere
(C) Tropopause
(D) Stratosphere
Option b – Ionosphere
Wireless Communication signals are reflected back to Earth by the ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Troposphere
(B) Stratosphere
(C) Ionosphere
(D) Exosphere
Option c – Ionosphere
Cosmic rays ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Consist only of charged particles
(B) Consist only of neutral particles
(C) May be either charged or neutral
(D) Do not fall into any of the above categories
Option a – Consist only of charged particles
Which statement about cosmic rays is incorrect? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) They are electromagnetic waves
(B) They possess extremely short wavelengths
(C) They are made up of highly energetic charged particles
(D) They originate from the Sun
Option a – They are electromagnetic waves
The distance between two successive crests or troughs of a wave is known as ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Amplitude
(B) Wavelength
(C) Frequency
(D) None of these
Option b – Wavelength
Which type of radiation is used to determine crystal structure? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Gamma rays
(B) X-rays
(C) Ultraviolet rays
(D) Visible Light
Option b – X-rays
Which of the following is a mechanical wave? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Radio waves
(B) X-rays
(C) Light waves
(D) sound waves
Option d – sound waves
Radar systems used to detect enemy aircraft operate using ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Light waves
(B) Radio waves
(C) sound waves
(D) Ultrasonic waves
Option b – Radio waves
What level of sound is generally considered tolerable for human ears? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) 45 decibel
(B) 85 decibel
(C) 125 decibel
(D) 155 decibel
Option b – 85 decibel
Noise Pollution is regarded as harmful when sound intensity exceeds which level? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) 30 dB
(B) 100 dB
(C) 80 dB
(D) 120 dB
Option c – 80 dB
Which sound intensity is considered most comfortable for humans? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) 90 dB
(B) 60 dB
(C) 120 dB
(D) 100 dB
Option b – 60 dB
A worker hits a Railway track, and a boy hears the sound twice by placing his ear on the rail. What explains this phenomenon? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) sound travels faster through steel than through air
(B) Sound travels faster through air than through steel
(C) Sound waves repeatedly reflect between the rails
(D) The boy’s ears are at unequal distances from the source
Option a – Sound travels faster through steel than through air
When the same note is produced on a sitar and a flute, why do they sound different? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Variation in pitch, loudness, and quality
(B) Difference in pitch and loudness only
(C) Difference in quality only
(D) Difference in loudness only
Option c – Difference in quality only
Among the following, which electromagnetic wave has the greatest wavelength? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Infrared radiation
(B) X-rays
(C) Visible Light
(D) Radio waves
Option d – Radio waves
Which type of wave is used by a TV remote to control a television? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Light waves
(B) Sound waves
(C) Microwaves
(D) Radio waves
Option d – Radio waves
Television remote controls operate using which electromagnetic radiation? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Infrared
(B) Ultraviolet
(C) Visible Light
(D) None of these
Option a – Infrared
Doppler effect can be observed in which of the following? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Light waves only
(B) Sound waves only
(C) Space waves only
(D) Both light and sound waves
Option d – Both light and sound waves
What usually happens when a television SET is switched on? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Sound and picture begin at the same time
(B) Sound begins immediately, picture appears later
(C) Picture appears immediately, sound starts later
(D) It varies with the brand of television
Option a – Sound and picture begin at the same time
In TV transmission, visual signals are sent using which modulation method? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Amplitude modulation
(B) Frequency modulation
(C) Phase modulation
(D) Angle modulation
Option a – Amplitude modulation
Which method is employed to transmit audio signals in television broadcasting? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Amplitude modulation
(B) Pulse code modulation
(C) Frequency modulation
(D) Time division multiplexing
Option c – Frequency modulation
A radio station transmits on a wavelength of 30 metres. What is the corresponding frequency? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) 10 kHz
(B) 100 kHz
(C) 10 MHz
(D) 100 MHz
Option c – 10 MHz
Arrange the speed of sound in increasing order for the following media: steel, water, and nitrogen. ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Nitrogen → Steel → Water
(B) Nitrogen → Water → Steel
(C) Water → Nitrogen → Steel
(D) Steel → Water → Nitrogen
Option b – Nitrogen → Water → Steel
Consider the statements below: 1. A flute of shorter length produces sound of lower frequency. 2. Sound propagates through rocks only as longitudinal elastic waves. Which option is correct? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Only the first statement
(B) Only the second statement
(C) Both statements
(D) Neither statement
Option b – Only the second statement
Ultrasonic waves are used for which of the following purposes?. 1. Destroying insects 2. Cleaning clothes by removing dust 3. Medical treatment 4. Operating automatic doors. Choose the correct option. ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Only 1 and 2
(B) Only 3 and 4
(C) 1, 2, and 3
(D) All of these
Option d – All of these
Examine the following statements: 1. The human heart produces infrasonic vibrations. 2. Sound travels faster in gases than in liquids and Solids. 3. Mach number expresses speed relative to sound. 4. Ultrasonic waves have frequencies above 20,000 Hz. Which SET of statements is correct? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) 1, 2, and 3
(B) 2, 3, and 4
(C) 1, 3, and 4
(D) 1, 2, and 4
Option c – 1, 3, and 4
Assertion (A): A jet flying at Mach 1 moves faster at high altitude than at sea level. Reason (R): The speed of sound varies with the temperature of the medium. ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Both A and R are true, and R explains A
(B) Both A and R are true, but R does not explain A
(C) A is true, but R is false
(D) A is false, but R is true
Option d – A is false, but R is true
Assertion (A): Reverberation is commonly noticed in large halls and churches. Reason (R): Multiple reflections occur from walls, ceilings, and floors. ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Both A and R are true, and R explains A
(B) Both A and R are true, but R does not explain A
(C) A is true, but R is false
(D) A is false, but R is true
Option a – Both A and R are true, and R explains A
Consider the following statements: 1. The diatonic musical scale consists of seven notes. 2. The frequency of Sa is 256 Hz, while Ni has a frequency of 512 Hz. Which option is correct? ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Only the first statement
(B) Only the second statement
(C) Both statements
(D) Neither statement
Option a – Only the first statement
Assertion (A): Radio waves bend when they pass through a magnetic field. Reason (R): Radio waves belong to the electromagnetic Spectrum. ( Nootan Physics Class 12 Solutions PDF Free Download )
(A) Both A and R are true, and R explains A
(B) Both A and R are true, but R does not explain A
(C) A is true, but R is false
(D) A is false, but R is true
Option d – A is false, but R is true
We provided the Nootan Physics Class 12 Solutions PDF Free Download above in this post for free so that you can practice well for the exam.
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