Page 39 - Physics - XI

Q16. The least count of a spherometer is given by
a. pitch × no. of circular divisions

pitch
b.
no. of circular divisions

c. no. of circular divisions

pitch
pitch
d.
mean distance between two consecutive legs of the spheerometer

Q17. A spherometer has 100 equal divisions marked along the periphery of its disc, and one full
rotation of the disc advances on the main scale by 0.01 cm. The least count of the system is
a. 10 cm b. 10 cm c. 0.01 cm d. 0.1 cm
–4
–3
Q18. A physical balance is an example of
a. inclined plane b. wedge
c. lever d. composite machine

Q19. The quantity of matter possessed by a body is known as
a. mass b. length c. volume d. density

Q20. Which of the following is the standard unit of measurement of mass?
a. Gram b. Kilogram c. Pound d. Dozen
Q21. The force by which the body is attracted by the Earth towards its centre is known as
a. mass b. weight c. pressure d. frictional force

Q22. The SI unit of weight is
a. gram b. kilogram c. newton d. dyne

Answer key
1. (c), 2. (b), 3. (a), 4. (b), 5. (d), 6. (c), 7. (d), 8. (b), 9. (d), 10. (a) , 11. (a), 12. (b), 13. (a),
14. (b), 15. (c), 16. (b), 17. (a), 18. (c) , 19. (a), 20. (b), 21. (b), 22. (c)

Case Study-Based Questions

Read the paragraph and answer the questions that follow.

The smallest division on the main scale of a Vernier Calliper is 1 mm and 10 Vernier divisions coincide
with 9 main scale divisions. The Vernier Calliper is used to measure the edge of a cube. The main scale
reading was found to be 10 and the fi rst division of the Vernier scale was found to be coinciding with the
main scale. The mass of the cube is 2.736 g.

Q1. What is the least count of the given Vernier Calliper?
a. 0.1 mm b. 0.1 cm c. 0.01 mm d. 1 µm

Q2. What is the edge length of the cube?
a. 1.01 mm b. 1.01 cm c. 10.1 cm d. 1.001 cm

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