1. The mean length of an object is 5 cm. Which of the following measurements is most accurate?

2. A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane. Its coordinates at a later time are the path of the particle makes with the x-axis an angle of

3.  Which of the following measurements is most precise?

4. Absolute error of the measurement is

5. Which of the following physical quantity is dimensionless?

6. Electron volt is a unit of

7. The number of significant figures in 0.06900 is:

8. The atmospheric pressure is 106 dyne/cm². What is its value in SI unit?

9. Resolution is

10. The weight of a body is 12g. This statement is not correct because:

11. Young’s modulus of steel is 1.9 × 10¹¹ N/m². When expressed in CGS units of dynes/cm², it will be equal to:

12. What is the number of significant figures in (3.20 + 4.80) × 10⁵?

13. Physical quantities are

14. Which of the following is not the name of physical quantity?

15. Light year is a unit of

16. Which of the following groups have different dimensions?

17. The dimensional formula for angular momentum is same as that for:

18. The dimensions of kinetic energy is same as that of

19. ML-1T -2 is the dimensional formula of

20. Give that the displacement of a particle is given by x = A² sin² kt, where t denotes the time. The unit of k is