General Science carries 50 marks in the AISSEE Class 9 paper (25 questions × 2 marks). These 10 MCQs on Force, Friction and Pressure 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. The SI unit of force is ________.
(A) newton
(B) watt
(C) joule
(D) pascal
Q2. The SI unit of pressure is ________.
(A) metre
(B) joule
(C) pascal
(D) newton
Q3. Pressure is defined as ________.
(A) mass × velocity
(B) force × area
(C) force per unit area
(D) work per unit time
Q4. Why does a sharp knife cut better than a blunt one?
(A) It has more friction
(B) It is heavier
(C) It is made of better steel
(D) A sharp edge has a smaller area, so it applies more pressure
Q5. Friction always acts ________ the direction of motion.
(A) at right angles to
(B) opposite to
(C) along
(D) independent of
Q6. Which of these reduces friction?
(A) Applying oil or grease
(B) Adding sand
(C) Rough surfaces
(D) Treaded tyres
Q7. Ball bearings are used in machines to ________.
(A) reduce friction
(B) produce heat
(C) increase friction
(D) increase weight
Q8. Liquid pressure ________ with depth.
(A) decreases
(B) increases
(C) stays the same
(D) becomes zero
Q9. The force that pulls objects towards the Earth is called ________.
(A) frictional force
(B) muscular force
(C) gravitational force
(D) magnetic force
Q10. Atmospheric pressure is measured using a ________.
(A) speedometer
(B) thermometer
(C) ammeter
(D) barometer
Answer Key with Explanations
(A) newton — Force is measured in newtons (N).
(C) pascal — 1 pascal = 1 newton per square metre.
(C) force per unit area — Pressure = Force ÷ Area.
(D) A sharp edge has a smaller area, so it applies more pressure — For the same force, a smaller area gives greater pressure.
(B) opposite to — Friction opposes motion between surfaces in contact.
(A) Applying oil or grease — Lubricants make surfaces smoother and reduce friction.
(A) reduce friction — Rolling friction is smaller than sliding friction.
(B) increases — That is why dams are made thicker at the bottom.
(C) gravitational force — Gravity pulls all objects towards the centre of the Earth.
(D) barometer — A mercury barometer was invented by Torricelli.
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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