Question Paper
Class / Subject: Class 9 (SSC) · Science and Technology (विज्ञान आणि तंत्रज्ञान)
Chapter: Chapter 4 — Chapter 4: Measurement of Matter
Time Allowed: 32 minutes
Max Marks: 16
1. What is Avogadro's number? [1]
(A) 6.022×10²³
(B) 6.022×10¹⁰
(C) 3.14×10²³
(D) 1×10²³
2. What does a mole represent? [1]
(A) 6.022×10²³ particles
(B) 100 particles
(C) 1 particle
(D) 1000 particles
3. What is molar mass? [1]
(A) Mass of 1 mole in grams
(B) Mass of 1 particle
(C) Mass of 1 litre
(D) Mass of 1kg always
4. How do we calculate the number of moles? [1]
(A) Mass ÷ molar mass
(B) Mass × molar mass
(C) Mass + molar mass
(D) Mass - molar mass
5. What is the molar mass numerically equal to? [1]
(A) Atomic or molecular mass
(B) Always 1
(C) Always 100
(D) Random number
6. Why is the mole concept important? [1]
(A) For balancing equations and stoichiometry
(B) No reason
(C) It's not useful
(D) Only for decoration
7. What is 1 mole of any substance equal to in particles? [1]
(A) 6.022×10²³
(B) 1
(C) 100
(D) 1000
8. Why learn about measurement of matter? [1]
(A) It's fundamental for quantitative chemistry
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is Avogadro's number? [1]
(A) 6.022×10²³
(B) 6.022×10¹⁰
(C) 3.14×10²³
(D) 1×10²³
10. What does a mole represent? [1]
(A) 6.022×10²³ particles
(B) 100 particles
(C) 1 particle
(D) 1000 particles
11. What is molar mass? [1]
(A) Mass of 1 mole in grams
(B) Mass of 1 particle
(C) Mass of 1 litre
(D) Mass of 1kg always
12. How do we calculate the number of moles? [1]
(A) Mass ÷ molar mass
(B) Mass × molar mass
(C) Mass + molar mass
(D) Mass - molar mass
13. What is the molar mass numerically equal to? [1]
(A) Atomic or molecular mass
(B) Always 1
(C) Always 100
(D) Random number
14. Why is the mole concept important? [1]
(A) For balancing equations and stoichiometry
(B) No reason
(C) It's not useful
(D) Only for decoration
15. What is 1 mole of any substance equal to in particles? [1]
(A) 6.022×10²³
(B) 1
(C) 100
(D) 1000
16. Why learn about measurement of matter? [1]
(A) It's fundamental for quantitative chemistry
(B) No reason
(C) It's not useful
(D) Only for tests