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1. The ^ ratio of time taken for half of the way to that of the whole journey by a free falling ^ object in air is A. B. C. D. E. 2:1 1:2 (2)1/2 : 2 (3)1/2 : 2 2 : (2)1/2 2. Which ^ of the following physical quantities is NOT a vector? ^ A. displacement B. velocity C. acceleration D. work E. force 3. Pressure ^ is measured in the unit ^ A. joule (J) B. kg ms-2 C. N m-2 D. volt (V) E. watt (W) 4. The ^ motion of an object is recorded ^ by a ticker timer with frequency 100 Hz. The tape obtained is shown. Calculate its acceleration. A. B. C. D. E. 2 ms-2 4 ms-2 6 ms-2 8 ms-2 10 ms-2 5. An ^ object is thrown vertically upwards and returns to its starting point in a time t. Which ^ of the following statements is/are correct ? (1) (2) (3) A. B. C. D. E. The displacement of the object in time t is zero. The object takes a time t/2 to reach the highest point. The acceleration of the object is zero at the highest point. (1) only (3) only (1) & (2) only (2) & (3) only (1), (2) & (3) 6. A ^ nucleus originally at rest split into two fragments of unequal mass. The fragment ^ with larger mass has a smaller (1) momentum (2) speed (3) kinetic energy A. B. C. D. E. (1) only (3) only (1) and (2) only (2) and (3) only (1), (2) and (3) 7. A ^ ball is projected from the ground vertically upwards at a velocity of 5 m s-1. What ^ is the time elapsed before it returns to the ground? A. B. C. D. E. 0.5 s 1.0 s 1.5 s 2.0 s 2.5 s 8. A ^ heavy box of 20 kg moves down a^ slope with acceleration 4.5 m s-2 . Find the friction acting on the box. A. B. C. D. E. 38.6 N 44.4 N 57.9 N 90.0 N 129.0 N 40 9. Two ^ metal spheres, X and Y, of mass m and 2m are projected vertically upward. If they ^ return to the ground at the same time, which of the following statements is/are (1) (2) (3) A. B. C. D. E. correct? They are projected with the same speed. They are projected to the same maximum height. The acceleration of Y is two times that of X. 1. Only 2. Only 1. and 2. Only 1. and 3. Only 2. and 3. Only 10. Two ^ balls of masses m and 2m respectively, ^ roll down from inclined planes as shown in figure. Determine the ratio of speed A to speed B as they reach the bottom point. A. B. C. D. E. 1:1 1: 2 1:2 1:4 1: 5