General Science carries 50 marks in the AISSEE Class 9 paper (25 questions × 2 marks). These 10 MCQs on Light and Sound are based on the NCERT Class 8 topics listed in the official syllabus.
Quick facts: AISSEE 2027 will be held on Sunday, 31 January 2027. There is no negative marking, so attempt every question. Online applications are open until 2 December 2026 on exams.nta.nic.in/sainik-school-society.
Practice Questions
Q1. Light travels fastest in ________.
(A) glass
(B) diamond
(C) water
(D) vacuum
Q2. The angle of incidence is always ________ the angle of reflection.
(A) less than
(B) equal to
(C) double
(D) greater than
Q3. The image formed by a plane mirror is ________.
(A) magnified and real
(B) smaller and real
(C) virtual and of the same size
(D) real and inverted
Q4. Splitting of white light into seven colours is called ________.
(A) reflection
(B) refraction only
(C) scattering
(D) dispersion
Q5. Sound cannot travel through ________.
(A) air
(B) iron
(C) vacuum
(D) water
Q6. Sound travels fastest in ________.
(A) liquids
(B) gases
(C) vacuum
(D) solids
Q7. The unit of frequency is ________.
(A) hertz
(B) metre
(C) newton
(D) decibel
Q8. Humans can hear sounds of frequency between ________.
(A) 50,000 Hz and 1,00,000 Hz
(B) 20 Hz and 20,000 Hz
(C) 1 Hz and 10 Hz
(D) 0 Hz and 5 Hz
Q9. Loudness of sound is measured in ________.
(A) decibels
(B) watts
(C) metres
(D) hertz
Q10. Which part of the eye controls the amount of light entering it?
(A) Iris and pupil
(B) Cornea only
(C) Retina
(D) Optic nerve
Answer Key with Explanations
(D) vacuum — Light's speed in vacuum is about 3 × 10⁸ m/s.
(B) equal to — This is the first law of reflection.
(C) virtual and of the same size — Plane mirror images are virtual, erect and laterally inverted.
(D) dispersion — A prism disperses white light into VIBGYOR.
(C) vacuum — Sound needs a medium, so it cannot travel in vacuum.
(D) solids — Particles in solids are close together, so sound moves fastest.
(A) hertz — One hertz means one vibration per second.
(B) 20 Hz and 20,000 Hz — Sounds above 20,000 Hz are ultrasonic.
(A) decibels — Loudness is measured in decibels (dB).
(A) Iris and pupil — The iris adjusts the size of the pupil.
How did you score?
9–10 correct: excellent — move on to a full-length mock test. 6–8: good — revise the explanations of the questions you missed. Below 6: study this topic again from your NCERT book and retry these questions after two days.
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