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RRB JE · General Science

Physics: Light & Sound Previous Year Questions

32 Physics: Light & Sound (General Science) questions asked in RRB JE previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.

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Other General Science topics

Physics: Electricity & Magnetism 59Chemistry: Acids, Bases & Salts 28Chemistry: Reactions 28Physics: Motion & Force 21Biology: Cell & Genetics 19Physics: Heat 18Biology: Plants 17Chemistry: Atoms & Periodic Table 12Biology: Nutrition & Diseases 11Chemistry: Carbon & Compounds 8
Q1RRB JE CBT-1, 18 Dec 2024, Shift 3 (4:30 PM)
What is the term for the band of colours produced when light is dispersed?
  1. AAbsorption
  2. BRefraction
  3. CSpectrum
  4. DReflection
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Correct answer: (C) Spectrum

Q2RRB JE CBT-1, 18 Dec 2024, Shift 3 (4:30 PM)
What type of image does a concave lens form when an object is placed at infinity?
  1. AReal, inverted and same size
  2. BVirtual, erect and point sized
  3. CVirtual, erect and larger
  4. DReal, erect and point sized
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Correct answer: (B) Virtual, erect and point sized

Q3RRB JE CBT-1, 18 Dec 2024, Shift 3 (4:30 PM)
An object is placed at 30 cm from a convex mirror with a focal length of 15 cm. Calculate the image distance (v) using the mirror formula.
  1. A15 cm
  2. B−15 cm
  3. C10 cm
  4. D−10 cm
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Correct answer: (C) 10 cm

Q4RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM)
A concave mirror can form a real, inverted and magnified image when the object is placed ____________.
  1. Aat the pole
  2. Bbetween the pole and the focus
  3. Cbeyond the centre of curvature
  4. Dbetween the focus and the centre of curvature
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Correct answer: (D) between the focus and the centre of curvature

Q5RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM)
The sirens of three companies sound together initially and then continue to sound at intervals of 12 minutes, 16 minutes, and 20 minutes, respectively. Over a period of 16 hours and 12 minutes from the time they first sound together, how many times will they sound simultaneously?
  1. A4 times
  2. B3 times
  3. C6 times
  4. D5 times
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Correct answer: (D) 5 times

Q6RRB JE CBT-1, 18 Dec 2024, Shift 2 (12:45 PM)
Why do stars appear to twinkle when viewed from the Earth?
  1. ARefraction in the Earth’s atmosphere
  2. BDiffraction by clouds
  3. CReflection in the atmosphere
  4. DScattering by particles
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Correct answer: (A) Refraction in the Earth’s atmosphere

Q7RRB JE CBT-1, 18 Dec 2024, Shift 1 (9:00 AM)
In a certain code language, ‘fan light door’ is coded as ‘dy ph mt’, ‘door window mat’ is coded as ‘lp ph st’, ‘mat fan glass’ is coded as ‘st bq dy’. What is the code for 'fan' in that language? (Note: All the codes are two-letter coded only.)
  1. Amt
  2. Bbq
  3. Cph
  4. Ddy
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Correct answer: (D) dy

Q8RRB JE CBT-1, 17 Dec 2024, Shift 3 (4:30 PM)
Where does the image form when an object is positioned at the centre of curvature of a concave mirror?
  1. AAt the centre of curvature
  2. BAt the pole
  3. CAt infinity
  4. DAt the focal point
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Correct answer: (A) At the centre of curvature

Q9RRB JE CBT-1, 17 Dec 2024, Shift 2 (12:45 PM)
For a concave mirror, where is the centre of curvature located relative to the mirror?
  1. AIn front of the mirror
  2. BBehind the mirror
  3. CAt the mirror's focal point
  4. DAt the mirror’s surface
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Correct answer: (A) In front of the mirror

Q10RRB JE CBT-1, 17 Dec 2024, Shift 2 (12:45 PM)
If the object is placed beyond the center of curvature (C) in front of a concave mirror, the image formed will be ___________.
  1. Avirtual, upright and diminished
  2. Breal, inverted and diminished
  3. Creal, inverted and enlarged
  4. Dvirtual, upright and enlarged
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Correct answer: (B) real, inverted and diminished

Q11RRB JE CBT-1, 17 Dec 2024, Shift 1 (9:00 AM)
Equipment such as geysers and air conditioners, compared to light bulbs and fans, require:
  1. Aless power
  2. Bless voltage
  3. Chigher voltage
  4. Dhigher power
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Correct answer: (D) higher power

Q12RRB JE CBT-1, 17 Dec 2024, Shift 1 (9:00 AM)
Seeds that are dispersed by animals often:
  1. Ahave hooks or edible flesh
  2. Bare very small and light weight
  3. Chave wings or parachutes
  4. Dcan float easily in water
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Correct answer: (A) have hooks or edible flesh

Q13RRB JE CBT-1, 17 Dec 2024, Shift 1 (9:00 AM)
If an image is formed by a spherical mirror with a magnification of +1, which of the following statements is true?
  1. AThe image is real and equal in size to the object.
  2. BThe image is virtual and half the size of the object.
  3. CThe image is virtual and equal in size to the object.
  4. DThe image is real and twice the size of the object.
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Correct answer: (C) The image is virtual and equal in size to the object.

Q14RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM)
When light exits a prism, what is the result of its interaction with the prism surfaces?
  1. ALight is refracted.
  2. BLight passes through without any change.
  3. CLight is only reflected.
  4. DLight is only absorbed.
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Correct answer: (A) Light is refracted.

Q15RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM)
Which factor does NOT affect the electric power consumed by an electric device?
  1. AFrequency of the device
  2. BResistance of the device
  3. CVoltage applied to the device
  4. DCurrent passing through the device
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Correct answer: (A) Frequency of the device

Q16RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM)
In the case of a thin lens, how are the centres of curvature typically positioned relative to the optical centre?
  1. AThey are equidistant from the optical centre.
  2. BThey are located on the lens surface itself.
  3. CThey are closer to the edge than to the optical centre.
  4. DThey coincide with the optical centre.
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Correct answer: (A) They are equidistant from the optical centre.

Q17RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM)
In which case will a lens produce a magnification of exactly 1?
  1. AWhen the object is at infinity
  2. BWhen the object is placed at twice the focal length
  3. CWhen the object is placed between centre of curvature and focal point
  4. DWhen the object is placed at the focal point
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Correct answer: (B) When the object is placed at twice the focal length

Q18RRB JE CBT-1, 16 Dec 2024, Shift 3 (4:30 PM)
In which of the following scenarios does the focal length of a concave mirror vary?
  1. AWhen placed in a vacuum
  2. BWhen placed in air
  3. CFocal length does not vary in any media
  4. DWhen placed in water
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Correct answer: (C) Focal length does not vary in any media

Q19RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM)
A dentist uses a mirror to obtain a large image of a patient’s tooth. Which mirror should the dentist use and why?
  1. APlane mirror, because it gives a real image
  2. BConcave mirror, because it gives a magnified image
  3. CSpherical mirror, because it gives a virtual image
  4. DConvex mirror, because it gives a magnified image
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Correct answer: (B) Concave mirror, because it gives a magnified image

Q20RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM)
Ozone shields the surface of the Earth from which type of radiation coming from the Sun?
  1. AX rays
  2. BWhite light
  3. CInfra-red
  4. DUltra violet
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Correct answer: (D) Ultra violet

Q21RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM)
What is the sign of the focal length for a convex lens as per the sign convention for spherical lenses?
  1. AZero
  2. BVariable
  3. CNegative
  4. DPositive
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Correct answer: (D) Positive

Q22RRB JE CBT-1, 25 Feb 2026, Shift 3 (4:30 PM)
A student uses a convex lens to project an image of a tree onto a wall. If the image is found to be smaller than the tree, what can be inferred about the tree's position relative to the lens?
  1. AThe tree is at twice the focal length from the lens.
  2. BThe tree is placed beyond twice the focal length (beyond 2F) of the lens.
  3. CThe tree is between the lens and its focal point.
  4. DThe tree is at the focal point of the lens.
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Correct answer: (B) The tree is placed beyond twice the focal length (beyond 2F) of the lens.

Q23RRB JE CBT-1, 20 Feb 2026, Shift 3 (4:30 PM)
If atmospheric refraction did not occur, which change would be most noticeable during the observation of stars from Earth?
  1. AStars would change color rapidly.
  2. BStars would disappear from the night sky.
  3. CPlanets would twinkle like stars.
  4. DStars would not twinkle; their light would remain steady.
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Correct answer: (D) Stars would not twinkle; their light would remain steady.

Q24RRB JE CBT-1, 20 Feb 2026, Shift 2 (12:45 PM)
A room heater and an electric bulb both convert electrical energy to heat, but why does only the bulb emit significant visible light?
  1. AThe bulb's filament reaches a higher temperature, emitting visible light
  2. BThe heater uses magnetic effect instead of heating effect
  3. CThe heater is made of a different material
  4. DThe circuit design is different
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Correct answer: (A) The bulb's filament reaches a higher temperature, emitting visible light

Q25RRB JE CBT-1, 20 Feb 2026, Shift 2 (12:45 PM)
A security mirror in a store is required to provide a wide field of view and always form diminished, upright images regardless of the position of objects. Which type of mirror and principle should be used for its design?
  1. APlane mirror for undistorted images
  2. BConcave mirror using the mirror formula for real, inverted images
  3. CConcave mirror for magnification
  4. DConvex mirror using the mirror formula for virtual, diminished images
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Correct answer: (D) Convex mirror using the mirror formula for virtual, diminished images

Q26RRB JE CBT-1, 20 Feb 2026, Shift 1 (9:00 AM)
Which property explains why the path of light is not visible when a beam passes through a true solution?
  1. AParticles are smaller than one nanometre
  2. BParticles can be removed by filtration
  3. CParticles are heavier than solvent molecules
  4. DParticles settle down on standing still
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Correct answer: (A) Particles are smaller than one nanometre

Q27RRB JE CBT-1, 20 Feb 2026, Shift 1 (9:00 AM)
When an object is placed at the center of curvature (C) of a concave mirror, what is the nature of the image formed?
  1. AEnlarged and inverted
  2. BHighly diminished, point-sized
  3. CReal and inverted
  4. DVirtual and erect
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Correct answer: (C) Real and inverted

Q28RRB JE CBT-1, 19 Feb 2026, Shift 3 (4:30 PM)
A bi-convex lens forms a real, inverted image twice as large as the object. Where is the object located relative to the lens?
  1. ABetween one focal length and twice the focal length from the lens
  2. BBeyond twice the focal length from the lens
  3. CAt twice the focal length from the lens
  4. DAt the focal length from the lens
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Correct answer: (A) Between one focal length and twice the focal length from the lens

Q29RRB JE CBT-1, 19 Feb 2026, Shift 2 (12:45 PM)
When an object is placed at infinity in front of a convex mirror, what is the nature of the image formed?
  1. AReal and inverted
  2. BReal and erect
  3. CVirtual and erect
  4. DVirtual and inverted
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Correct answer: (C) Virtual and erect

Q30RRB JE CBT-1, 19 Feb 2026, Shift 2 (12:45 PM)
A person with both myopia and hypermetropia is most likely to use which type of lens?
  1. AConcave lens
  2. BCylindrical lens
  3. CConvex lens
  4. DBi-focal lens
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Correct answer: (D) Bi-focal lens

Q31RRB JE CBT-1, 19 Feb 2026, Shift 1 (9:00 AM)
If a convex mirror forms a point-sized image at its focus, where is the object located?
  1. AAt infinity
  2. BBetween F and the pole
  3. CBetween P and F
  4. DAt the pole
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Correct answer: (A) At infinity

Q32RRB JE CBT-1, 19 Feb 2026, Shift 1 (9:00 AM)
What is the function of the iris in the human eye?
  1. AControls the size of the pupil
  2. BRefracts incoming light rays
  3. CTransmits signals to the brain
  4. DForms the image on the retina
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Correct answer: (A) Controls the size of the pupil

How to use these RRB JE General Science questions

Every question here was asked in a real RRB JE paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full RRB JE papers as timed tests to check your speed under exam conditions.

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