Question Paper
Class / Subject: Class 9 (CBSE) · Science
Chapter: Chapter 1 — Chapter 1: Matter in Our Surroundings
Time Allowed: 15 minutes
Max Marks: 6
1. Particles are most closely packed in: [1]
(A) solids
(B) gases
(C) liquids
(D) plasma
2. According to kinetic theory, increasing temperature: [1]
(A) increases particle kinetic energy
(B) stops particle motion
(C) decreases particle spacing in gases
(D) has no effect on particles
3. Gases have high compressibility mainly because: [1]
(A) their particles are widely spaced
(B) their particles are tightly packed
(C) they have no particles
(D) they are always hot
4. Evaporation increases with: [1]
(A) higher temperature
(B) higher humidity
(C) lower surface area
(D) no wind
5. Evaporation causes cooling because: [1]
(A) high-energy particles escape, leaving cooler particles
(B) low-energy particles escape
(C) all particles escape equally
(D) no particles escape
6. Boiling differs from evaporation because boiling occurs: [1]
(A) throughout the liquid at a fixed temperature
(B) only at the surface at any temperature
(C) only in solids
(D) only in gases