Page 1 :
PHYSICS Total Marks : 24, , D [> Pp DPP No. 15 Max. Time : 24 min., , DAILY PRACTICE PROBLEMS:, , , , Topic : Projectile Motion, , , , , , , , Type of Questions, Single choice Objective ('-1" negative marking) Q.1 to Q.8 (3 marks, 3 min.), 4, A particle travels according to the equation x = at’, y = bt”. The equation of the trajectory is, wy @) y=2= cy (y=, b a a a, 2 Speed at the maximum height of a projectile is half of its initial speed u. Its range on the horizontal, plane is: = ‘, au? Yau? v ie, (A) oO (8) 2g (c) 39 (D) 29, 3. Acricket ball is hit for a six leaving the bat at an angle of 45° to the horizontal with kinetic energy k. At, the top of trajectory the kinetic energy of the ball is ke ‘, (A) zero (B)k (Cc) EB (0) 2, 4 Apartide is projected from a horizontal floor with speed 10 m/s at an angle 30° with the floor and striking the, floor after sometime. State which is correct., (A) Velocity of particle will be perpendicular to initial direction two seconds after projection., (8) Minimum speed of particle wall be 5 m/sec., (C) Displacement of particle after half second will be 35/4 m., (D) Noneofthese, 5. Abody is projected with a speed u at an angle to the horizontal to have maximum range. At the highest, point the speed is :, u, (A) zero (8) u v2 (yu OG, 6. Ratio of the ranges of the bullets fired from a gun (of constant muzzie speed) at angle 0, 20 & 40 is foundin, the ratio x : 2: 2, then the value of x will be (Assume same muzzle speed of bullets), (Ay4 (B)2 ©) 3 (0) none of these, % A particle is projected with a speed 10 /2 m/s making an angle 45° with the horizontal. Neglect the, effect of air friction. Then after 1 second of projection. Take g=10 m/s?, (A) the height of the particle above the point of projection is 5m, (B) the height of the particle above the point of projection is 10 m_, (C) the horizontal distance of the particle from the point of projection is § m., (D) the horizontal distance of the particle from the point of projection is 15m., 8. Aparticie has initial velocity, ¥ =3)+4] and a constant force F = 4i-3] acts on the partide. The path of the, , Particle is (A) straight line (B) parabolic (C) circular (0) elliptical