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Navbodh Physics Class 12 PDF Download in Hindi Medium. We provided the Navbodh Physics Class 12 PDF Download in Hindi Medium in this post for free so that you can practice well for the exam.
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Navbodh Physics Class 12 PDF Download in Hindi Medium for Students
In which medium does Light travel with the greatest speed?
(a) Water
(b) Diamond
(c) Empty space
(d) Hydrogen gas
Option c - Empty space
Through which medium does Light travel with the least speed?
(a) Glass
(b) Vacuum
(c) Water
(d) Air
Option a - Glass
Approximately how much time does sunlight take to reach the Earth?
(a) 4.2 seconds
(b) 4.8 seconds
(c) 8.5 minutes
(d) 3.6 hours
Option c - 8.5 minutes
When a Light ray moves from air into glass, which physical quantities are altered?
(a) Wavelength, frequency and speed
(b) Speed and frequency
(c) Wavelength and frequency
(d) Wavelength and speed
Option d - Wavelength and speed
When Light enters a different medium, which of the following remains unchanged?
(a) Intensity
(b) Speed
(c) Wavelength
(d) Frequency
Option d - Frequency
During photosynthesis, which form of energy transformation occurs?
(a) Light energy into chemical energy
(b) Light energy into Heat energy
(c) Heat energy into biochemical energy
(d) Heat energy into mechanical energy
Which gas is commonly filled in discharge tubes used for decorative lighting and advertising?
(a) Carbon dioxide
(b) Ammonia
(c) Sulphur dioxide
(d) Neon
Option d - Neon
The colorful appearance seen in a thin soap film is caused by which optical effect?
(a) Total reflection and interference
(b) Total refraction and dispersion
(c) Diffraction and dispersion
(d) Polarization and interference
Option a - Total reflection and interference
Total internal reflection is possible when Light moves from
(a) Diamond to glass
(b) Water to glass
(c) Air to water
(d) Air to glass
Option a - Diamond to glass
The brilliance of a cut diamond is mainly due to
(a) An inherent physical property
(b) Total internal reflection of Light
(c) Its crystal arrangement
(d) Absorption of Light
Option b - Total internal reflection of light
Optical fibres function based on which principle?
(a) Total internal reflection
(b) Refraction
(c) Scattering
(d) Interference
Option a - Total internal reflection
Which optical phenomenon is applied in fibre Optics?
(a) Interference
(b) Refraction
(c) Total internal reflection
(d) Polarisation
Option c - Total internal reflection
In fibre optic Communication systems, information is transmitted as
(a) Light waves
(b) Radio waves
(c) Microwaves
(d) Electrical signals
Option a - Light waves
The working principle of an endoscope used for medical examination is based on
(a) Reflection of light
(b) Dispersion of light
(c) Refraction of light
(d) Total internal reflection of light
Option d - Total internal reflection of light
An endoscope can best be described as a
(a) Narrow telescope
(b) Specialized camera
(c) Simple microscope
(d) None of these
Option d - None of these
The optical phenomenon responsible for mirage formation is
(a) Interference
(b) Diffraction
(c) Polarization
(d) Total internal reflection
Option d - Total internal reflection
Mirage formation is an illustration of
(a) Refraction
(b) Dispersion
(c) Total internal reflection
(d) Diffraction
Option c - Total internal reflection
The shiny appearance of a diamond is mainly because of
(a) Reflection
(b) Refraction
(c) Total internal reflection
(d) Scattering
Option c - Total internal reflection
Properly cut diamonds shine intensely mainly because
(a) They are highly transparent
(b) They have a high refractive index
(c) They are extremely hard
(d) They possess fixed deviation angles
Option b - They have a high refractive index
A well-cut diamond sparkles brightly due to
(a) Total internal reflection
(b) Absorption of light
(c) An inherent characteristic
(d) Its Molecular structure
Option a - Total internal reflection
The method used to record and recreate images of three-dimensional objects is called
(a) Audiography
(b) Lexicography
(c) Photography
(d) Holography
Option d - Holography
Which technique is employed for capturing three-dimensional images?
(a) Photography
(b) Holography
(c) Radiography
(d) None of these
Option b - Holography
The process of forming images by directing an electron beam onto a phosphor-coated screen is known as
(a) Master scan
(b) Total scan
(c) Raster scan
(d) Radar scan
Option c - Raster scan
The Raman effect is associated with light passing through
(a) Liquids only
(b) Prisms only
(c) Diamonds only
(d) All transparent substances
Option d - All transparent substances
A CD audio player reproduces sound using a
(a) Quartz crystal
(b) Titanium needle
(c) Laser beam
(d) Barium titanate ceramic
Option c - Laser beam
The appearance of rainbow-like colours on a compact disc in sunlight is explained by
(a) Reflection and Diffraction
(b) Reflection and transmission
(c) Diffraction and transmission
(d) Refraction and Diffraction
Option a - Reflection and Diffraction
Television signals cannot be received beyond a certain range because
(a) The signals become weak
(b) The antenna strength is low
(c) The Atmosphere absorbs the signals
(d) The Earth’s surface is curved
Option d - The Earth’s surface is curved
Which modulation technique is used to transmit audio signals in television broadcasting?
(a) Amplitude modulation
(b) Frequency modulation
(c) Pulse code modulation
(d) Time division multiplexing
Option b - Frequency modulation
While driving a car, which type of mirror is preferred for viewing traffic behind?
(a) Concave mirror
(b) Spherical mirror
(c) Convex mirror
(d) Plane mirror
Option c - Convex mirror
Which mirror is commonly used for shaving?
(a) Concave mirror
(b) Plane mirror
(c) Convex mirror
(d) None of these
Option a - Concave mirror
To protect oneself from sunlight, which colour combination of an umbrella is most suitable?
(a) Black on top and white on the inside
(b) White on top and black on the inside
(c) Completely black
(d) Completely white
Option b - White on top and black on the inside
The image formed by an astronomical telescope is
(a) Virtual and diminished
(b) Virtual and magnified
(c) Real and diminished
(d) Real and magnified
Option b - Virtual and magnified
The number of images formed when an object is placed between two parallel mirrors is
(a) Two
(b) One
(c) Six
(d) Infinite
Option d - Infinite
If a mirror is rotated through an angle θ, the reflected ray turns through
(a) θ
(b) θ⁄2
(c) θ
(d) 2θ
Option d - 2θ
White light consists of seven colours. How can these colours be separated?
(a) By using a prism
(b) By using a filter
(c) By using plants
(d) They cannot be separated
Option a - By using a prism
The correct sequence of colours in a rainbow is
(a) Blue, green, violet
(b) Violet, green, blue
(c) Blue, yellow, green
(d) Blue, green, yellow
Option d - Blue, green, yellow
Which colour appears at the centre of a rainbow?
(a) Blue
(b) Green
(c) Red
(d) Yellow
Option b - Green
The colours seen at the two ends of a rainbow are
(a) Blue and orange
(b) Green and red
(c) Yellow and green
(d) Violet and red
Option d - Violet and red
In which direction is a rainbow observed at noon?
(a) Towards the west
(b) Towards the south
(c) Towards the east
(d) It cannot be seen
Option d - It cannot be seen
An air bubble present in water behaves like a
(a) Convex mirror
(b) Convex lens
(c) Concave mirror
(d) Concave lens
Option d - Concave lens
An air bubble inside water acts as a
(a) Bifocal lens
(b) Converging lens
(c) Diverging lens
(d) Cylindrical lens
Option c - Diverging lens
The minimum height of a plane mirror required to see the full image of a person is equal to
(a) The full height of the person
(b) Half the height of the person
(c) One-fourth the height of the person
(d) Twice the height of the person
Option b - Half the height of the person
The radius of curvature of a plane mirror is
(a) Zero
(b) One
(c) Infinite
(d) Between one and infinity
Option c - Infinite
What should be the minimum height of a mirror to see the full image of a person of height 1.50 m?
(a) 0.75 m
(b) 1.00 m
(c) 1.50 m
(d) 3.00 m
Option a - 0.75 m
To correct long-sightedness, which optical device is used?
(a) Concave lens
(b) Convex mirror
(c) Convex lens
(d) Concave mirror
Option c - Convex lens
Which of the following statements is incorrect for a person suffering from hypermetropia?
(a) Distant objects are seen clearly
(b) The focal length of the eye lens is large
(c) The image of near objects forms behind the retina
(d) A concave lens is used for correction
Option d - A concave lens is used for correction
Which type of lens is used to correct myopia?
(a) Convex lens
(b) Concave lens
(c) Cylindrical lens
(d) None of these
Option b - Concave lens
When a person enters a dark room from bright light, vision is temporarily unclear because of
(a) Change in the size of the pupil
(b) Change in the focal length of the lens
(c) Bleaching and regeneration of rhodopsin
(d) Eyes becoming familiar with darkness
Option d - Eyes becoming familiar with darkness
Reading glasses are made using which type of lens?
(a) Concave
(b) Convex
(c) Plane
(d) None of these
Option b - Convex
Focusing in the human eye is achieved by
(a) Changing the curvature of the lens
(b) Forward and backward movement of the lens
(c) Movement of the retina
(d) Change in refractive index of eye fluids
Option a - Changing the curvature of the lens
Which of the following statements is incorrect?
(a) Mirage is an optical illusion caused by total internal reflection
(b) Concave mirrors are used in searchlights
(c) Light-coloured clothes are preferred in summer
(d) Convex mirrors with small aperture are used to examine ear, nose and throat
Option d - Convex mirrors with small aperture are used to examine ear, nose and throat
The mirror used in searchlights is a
(a) Concave mirror
(b) Convex mirror
(c) Plane mirror
(d) None of these
Option a - Concave mirror
The least distance of distinct vision for a normal eye is
(a) 25 cm
(b) 5 cm
(c) 75 cm
(d) 100 cm
Option a - 25 cm
For a normal eye, the minimum distance for clear vision is
(a) 10 cm
(b) 15 cm
(c) 20 cm
(d) 25 cm
Option d - 25 cm
Assertion (A): Warning signals are designed using the red colour. Reason (R): Red light experiences the minimum scattering in the Atmosphere.
(a) Both A and R are correct, and R correctly 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 correctly explains A
Examine the following statements concerning the scattering of light: 1. The sky looks blue because shorter wavelengths are scattered more. 2. The seven colours observed in a rainbow are mainly due to scattering of light. 3. At sunrise, the Sun appears reddish because of scattering of light. Which of the statements given above is/are correct?
(a) Only the first statement
(b) The first and third statements only
(c) Only the second statement
(d) The second and third statements only
Option b - The first and third statements only
Assertion (A): Glass beads attached to traffic reflectors appear bright when light strikes them. Reason (R): When light passes from a denser medium to a rarer medium at an angle greater than the critical angle, total internal reflection takes place.
(a) Both A and R are correct, and R correctly 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 correctly explains A
When sunlight passes through raindrops, a rainbow is formed. Which of the following physical processes are involved?. 1. Dispersion 2. Refraction 3. Internal reflection
(a) Only dispersion and refraction
(b) Only refraction and internal reflection
(c) Only dispersion and internal reflection
(d) Dispersion, refraction, and internal reflection
Option d - Dispersion, refraction, and internal reflection
Assertion (A): A stick placed obliquely in water appears bent and shorter at the surface when viewed from the side. Reason (R): The light rays from the stick are scattered by water molecules, producing this effect.
(a) Both A and R are correct, and R correctly 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
Consider the following statements related to refraction of light: 1. A coin lying at the bottom of a water-filled vessel seems closer when seen from above. 2. A coin kept above the water surface appears elevated when viewed by someone underwater. Which of the statements given above is/are correct?
(a) Both statements are correct
(b) Only the first statement is correct
(c) Only the second statement is correct
(d) Neither statement is correct
Option a - Both statements are correct
The approximate amount of Heat needed to change one gram of ice at 0°C into steam at 100°C is
(a) 80 calories
(b) 336 calories
(c) 720 calories
(d) 620 calories
Option c - 720 calories
At which temperature do the Celsius and Fahrenheit temperature scales coincide?
(a) −40°
(b) 212°
(c) 40°
(d) 100°
Option a - −40°
Steam at 100°C produces more severe burns than water at the same temperature because
(a) Steam is in the gaseous state
(b) Steam gives out more Heat
(c) Steam is combustible
(d) Steam applies more pressure
Option b - Steam gives out more Heat
Steam causes more intense burns than boiling water mainly because
(a) Steam possesses latent Heat of vaporisation
(b) Steam enters the skin more easily
(c) Steam has greater energy
(d) Steam is lighter than water
Option a - Steam possesses latent Heat of vaporisation
At what temperature does the Fahrenheit reading become twice the Celsius reading?
(a) −6.7°C
(b) −12.3°C
(c) 12.3°C
(d) 160°C
Option d - 160°C
The normal body temperature of a healthy human being is
(a) 37°C
(b) 37°F
(c) 98.4°C
(d) 98.4 K
Option a - 37°C
The standard human body temperature expressed in Kelvin is
(a) 280 K
(b) 290 K
(c) 300 K
(d) 310 K
Option d - 310 K
The normal body temperature is 98.4°F. Its equivalent value on the Celsius scale is
(a) 40.16°C
(b) 36.89°C
(c) 35.72°C
(d) 32.36°C
Option b - 36.89°C
In very cold climates, Alcohol is used instead of mercury in thermometers because
(a) Alcohol freezes at a much lower temperature
(b) Alcohol conducts Heat better
(c) Alcohol is less expensive than mercury
(d) Alcohol is more abundantly available than mercury
Option a - Alcohol freezes at a much lower temperature
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- Important Questions for Class 12 Physics HSC Board
