Question Paper
Class / Subject: Class 9 (SSC) · Science and Technology (विज्ञान आणि तंत्रज्ञान)
Chapter: Chapter 14 — Chapter 14: Substances in Common Use
Time Allowed: 32 minutes
Max Marks: 16
1. What are examples of common substances? [1]
(A) Cleaning agents, preservatives, medicines
(B) Only water
(C) Only air
(D) Nothing chemical
2. How do soaps and detergents work? [1]
(A) Breaking down grease and dirt
(B) Adding more grease
(C) Doing nothing to dirt
(D) Only adding colour
3. What helps soaps work with water? [1]
(A) Their molecular structure
(B) Random chance
(C) Only heat
(D) Only pressure
4. What do food preservatives do? [1]
(A) Extend shelf life
(B) Shorten shelf life
(C) Have no effect
(D) Only add colour
5. What do flavour enhancers do? [1]
(A) Improve taste
(B) Worsen taste
(C) Have no taste effect
(D) Only add colour
6. Why do food additives need regulation? [1]
(A) To ensure safe usage and health
(B) They don't need regulation
(C) Regulation is harmful
(D) No reason
7. What is important about chemical substances? [1]
(A) Safe use, storage, and disposal
(B) Only their cost
(C) Only their colour
(D) Nothing is important
8. Why learn about common substances? [1]
(A) To understand safe usage in daily life
(B) No reason
(C) It's not useful
(D) Only for tests
9. What are examples of common substances? [1]
(A) Cleaning agents, preservatives, medicines
(B) Only water
(C) Only air
(D) Nothing chemical
10. How do soaps and detergents work? [1]
(A) Breaking down grease and dirt
(B) Adding more grease
(C) Doing nothing to dirt
(D) Only adding colour
11. What helps soaps work with water? [1]
(A) Their molecular structure
(B) Random chance
(C) Only heat
(D) Only pressure
12. What do food preservatives do? [1]
(A) Extend shelf life
(B) Shorten shelf life
(C) Have no effect
(D) Only add colour
13. What do flavour enhancers do? [1]
(A) Improve taste
(B) Worsen taste
(C) Have no taste effect
(D) Only add colour
14. Why do food additives need regulation? [1]
(A) To ensure safe usage and health
(B) They don't need regulation
(C) Regulation is harmful
(D) No reason
15. What is important about chemical substances? [1]
(A) Safe use, storage, and disposal
(B) Only their cost
(C) Only their colour
(D) Nothing is important
16. Why learn about common substances? [1]
(A) To understand safe usage in daily life
(B) No reason
(C) It's not useful
(D) Only for tests