Projectile Motion

[Pages:8]The module presented herein is a sequel to the units on Rotational motion and Oscillations etc. posted earlier. The

contents of the document are intended to give the student a revision of the topic PROJECTILE MOTION in Class XI.

Projectile Motion

Multiple Choice Questions

IKGOGIA

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Q1. A ball is projected with velocity 10 m/sec at angle of 30o with the horizontal surface. The speed of the ball after 1 second will be (Use g=10m/sec2)

a. 5 m/sec b. 20 m/sec c. 8 m/sec d. 10 m/sec e. 12 m/sec

Q2. A ball is projected with velocity 10 m/sec at angle of 30o with the horizontal surface. The time taken by ball to reach the ground is

a. 1 sec b. 2 sec c. 3 sec d. 4 sec e. 5 sec

Q3. A ball is projected with velocity 10 m/sec at angle of 30o with the horizontal surface. The range of the projectile is

a. 10 m b. 103m c. 203m d. 303m e. 403m

Q4. A ball is projected with velocity 10 m/sec at angle of 30o with the horizontal surface. The maximum height attained by the projectile is

a. 5 m b. 10 m c. 15 m d. 20 m e. 25 m

Q5. A ball is projected with velocity 10 m/sec at angle of 30o with the horizontal surface. The angle made by the line joining point of projection with the point of maximum height is

a. tan? 2/3

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b. tan? 1/23 c. tan? 3 d. tan? 1/3 e. tan? 3/2

Q6. The angle of projection for the range of projectile to be equal to its maximum height is

a. =tan? (2) b. =tan? (3) c. =tan? (4) d. =tan?(2/3) e. =tan?(1/3) Q7.For a projectile fired with a certain velocity, the Maximum possible Range and the Maximum height attainable are related as

a. Rmax=2Hmax b. Rmax=Hmax/2 c. Rmax=3Hmax d. Rmax=Hmax e. Rmax=-Hmax

Q8. A ball projected at an angle , attains a maximum height H1 and if the ball is projected at angle of (90-) and the maximum height attained by the ball is H2. Then the range of projectile will be

a. R= H1H2 b. R= H1H2 /2 c. R= 2H1H2 d. R= 3H1H2 e. R= H1H2/3

Q9. The motion of a projectile is described by the equation y=ax - bx?. The range of projectile is

a. a?/b? b. a/2b c. 2a/b d. a/b

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e. a/b?

Q10. A body is projected with kinetic energy E so as to attain maximum horizontal range. Its potential energy at the highest point is

a. E b. E/2 c. 2E d. 2E

Q11. A gun with a muzzle velocity of 500 m/s shoots a bullet at a target 50m away. To hit the target the gun should be aimed (g=10m/s?)

a. directly towards the target along the line joining the gun and bird b. 10 cm high above the target. c. 5 cm high above the target. d. 5cm below the target. Q12. For a body thrown horizontally from the top of a tower, a. the time of flight depends on both h and v. b. the horizontal Range depends only on v but not on h. c. the time of flight and horizontal Range depends on h but not on v. d. the horizontal Range depends on both v and h. Q13. Two particles are projected with same velocity but at angles of projection (45-) and (45+). Then their horizontal ranges are in the ratio of a. 1:2 b. 2:1 c. 1:1 d. 90/2

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Q14. A body is projected horizontally from a height of 78.4m with a velocity 10m/s. The angle made by velocity vector with x axis after 4 seconds is

a. tan?3 b. tan?4 c. tan?5 d. tan?6 Q15. A body is projected vertically downwards with the velocity 5m/s from a height of 60m. Its time of descent is a. 2s b. 3s c. 4s d. 5s Q16. The acceleration of a projectile relative to another projectile is a. -g b. g c. 2g d. 0 Q17. An aeroplane flying horizontally at an altitude of 490m with a speed of 180km/h drops a bomb. The horizontal distance at which it hits the ground is(g=9.8m/s?) a. 500m b. 1000m c. 250m

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d. 50m Q18. A body projected with velocity 30m/s reaches its maximum height in 1.5s. Its range is (g=10m/s?)

a. 45m b. 108m c. 453m d. 54m Q19. A body is thrown with the velocity (4i + 3j) m/s. Its maximum height is (g=10m/s?) a. 2.5m b. 0.8m c. 0.9m d. 0.45m Q20. A stone is projected horizontally with a velocity 9.8m/s from a tower of height 100m. Its speed 1 s after projection is a. 9.8m/s b. 4.9m/s c. 9.82m/s d. 4.92m/s

ANSWERS 1. d 2. b 3. c 4. a 5. b 6. c 7. a 8. d 9. d 10. d 11. c 12d 13c

14. b 15b 16. d 17.a 18. c 19. d 20c

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