1.Units and Measurements
1]. Choose the correct option: i) [L¹M¹T‐²] is the dimensional formula for (A) Velocity (B) Acceleration (C) Force (D) Work Ans) c) Force ii) The error in the measurement of the sides of a rectangle is 1%. The error in the measurement of its area is (A) 1% (B) (½)% (C) 2% (D) None of the above. Ans) c) 2% iii) Light year is a unit of (A) Time (B) Mass (C) Distance (D) Luminosity Ans) c) distance iv) Dimensions of kinetic energy are the same as that of (A) Force (B) Acceleration (C) Work (D) Pressure Ans) c) Work v) Which of the following is not a fundamental unit? (A) cm (B) kg (C) centigrade (D) volt Ans) d) volt 2]. Answer the following questions. i) Star A is farther than star B. Which star will have a large parallax angle? Ans) Answer: Parallax angle is given by, θ = b / D Here, b is constant for the two stars. ∴ θ ∝ 1 / D ...