Motion

1. In a free fall the velocity of a stone is increasing equally in equal intervals of time under the effect of gravitational force of the earth. Then what can you say about the motion of this stone? Whether the stone is having:

• a. Uniform acceleration

• b. Non- Uniform acceleration

• c. Constant speed

• d. Retardation

2. A particle is moving in a circular path of radius r. The displacement after half a circle would be:

• a. zero

• b. πr

• 3. 2r

• 4. 2πr

3. Acceleration is a vector quantity, which indicates that its value

• a. Can be positive

• b. Can be negative

• c. Can be Zero

• d. Always positive

4. The speedometer of a car measures its______________ speed.

5. SI unit of speed is ______________

• m/s

• metres per second

• Metres per second square

• kilometers

6. The numerical ratio of displacement to distance for a moving object is_______

• a. always less than 1

• b. always more than 1

• c. always equal to 1

• d. equal or less than 1

7. A driver decreases the speed of a car from 25m/s to 10m/s in 5seconds. Find the acceleration of the car.

• a. 3 ㎨

• b. - 3㎨

• c. 5 ㎨

• d. - 5 ㎨

8. A worker covers a distance of 40 km from his house to his place of work, and 10 km towards his house back. Then the displacement covered by the worker in the whole trip is___________

• a. 0

• b. 10 km

• c. 30 km

• d. 50 km

9. Rate of change of displacement is called _____________

10. An object travels 40m in 5 sec and then another 80m in 5 sec. What is the average speed of the object?

• a. 10 m/s

• b. 6 m/s

• c. 12 m/s

• d. 0