Assignment-2 (Physics)---MOTION IN ONE DIMENSION

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1. A projectile is fired with a velocity of 9.8 ms^-1 in the vertical direction. Its velocity after one second is:

a. Zero

b. 2.45 ms^-1

c. 4.5ms^-1

d. 9.8 ms^-1

2. A projectile has maximum range 500m. If the projectile is thrown up an inclined plane of 30^o with same velocity the distance covered by it along the inclined plane will be

a. 250m

b. 500m

c. 750m

d. 1000m

3. A projectile is projected with linear momentum ^→p making an angle with the horizontal. The change in momentum of projectile on return to the ground will be

a. 2p

b. 2p cos

c. 2p sin

d. 2p tan

4. Which of the following is essential characteristic for projectile?

a. Initial velocity inclined to horizontal

b. Zero velocity for highest point

c. constant acc. to the vector

d. None of these

5. Which of the following remains constant for projectile fired from earth?

a. K.E.

b. Momentum

c. horizontal component of velocity

d. vertical component of velocity

6. The range of the projectile is Maximum. If the range is R, what is maximum height

a. 2R

b. R

c. R/2

d. R/4

7. A ball is thrown horizontally from the top of the tower. What happens to the horizontal component of velocity?

a. Increases

b. decreases

c. unchanged

d. first decreases then increases

8. Two projectiles are fired at different angles with same magnitude of velocity such that they have same range. At what angle they might have been projected?

a. 10^o and 50^o

b. 25^o and 65^o

c. 30^o and 75^o

d. none of these

9. A ball is projected from top of the tower at angle 60^o with vertical. What happens to the vertical component of velocity?

a. Increases continuously

b. Decreases continuously

c. remains unchanged

d. first decreases then increases

10. A particle covers equal distances around a circular path in equal interval of time. It has uniform non zero rate of change of:

a. Linear displacement

b. Angular displacement

c. linear velocity

d. angular velocity

11. A particle is moving around circular path with uniform angular speed . The radius of the circular path is r. the acc. Of the particle is:

a. ²/r

b. /r

c. r²

d. r²

12. Which of the following statement about the rotatory motion along a circular path is true?

a. Linear velocity is uniform when angular velocity is uniform

b. Magnitude of acc. Is constant

c. Acc. Is directed along the tangent to the circular path.

d. None of these

13. A particle is moving along circular path with uniform speed. What is the angle b/w its instantaneous velocity and acc.?

a. Unchanged

b. Halved

c. Doubled

d. b’comes 4 times

14. A particle is moving along circular path of radius 2m and with uniform speed of 5ms^-1. What will be the change in velocity when the particular completes half of the revolution?

a. 0

b. 10ms^-1

c. 10 ms^-1

d. 10/ ms^-1

15. A particle is moving along a circular path of radius 5m and with uniform speed 5ms^-1. What will be the average acc. When the particle completes half revolution

a. 0

b. 10ms^-2

c. 10 ms^-2

d. 10/ ms^-2

16. A car moves on a circular road. It describes equal angles about the centre in equal intervals of time. Which of the following statements about the velocity of the car is true?

a. Velocity is constant

b. Magnitude of velocity is constant but direction changes

c. both magnitude and direction of velocity changes

d. Velocity is directed towards the centre of the circle.

17. A wheel is subjected to uniform angular acc. About its axis. Initially its angular velocity is 0. In the first 2 sec ,it rotates through angle ₁. In the next 2 sec, it rotates through angle ₂. What is the ratio ₂/₁?

a. 1

b. 2

c. 3

d. 4

18. If a cyclist doubles his speed while negotiating a curve, how does the tendency to overturn vary?

a. Unchanged

b. Doubled

c. Halved

d. Quadrupled

19. The radius of circular path of particle is doubled but it frequency of rotation remains unchanged. If the initial centripetal force be F. then the final value of centripetal force will be

a. F

b. 2F

c. 4F

d. F/4

20. A body of mass 1 kg is rotating in vertical circle of radius 1m. What will be the difference in its K.E at the top and bottom of the circle? Take g=10 ms^-2

a. 10 J

b. 20J

c. 30J

d. 50J