Motion in st line

1. A body moves along a quadrant of a circle of radius r. the displacement and distance traveled are

• r √2, πr/2
• r, πr
• 2 √2, πr
• r, πr/2

2. The magnitude of average velocity is equal to the average speed when a particle moves

• on a curved path
• in the same direction
• constant acceleration
• constant retardation

3. A student travels along a straight road for five minutes with velocity v1 and then for five minutes with a velocity of v2. the mean velocity will be given by

• (v1 v2)/2
• 2/(v1 v2)
• (v1+v2)/2
• (v1 v2)/(v1+v2)

4. The position time graph of two children A and B returning from their school O to their homes P and Q respectively is shown in the figure

• child A lies close to the school
• child B ;lies close to the school
• both lies at the same distance from the school
• all the above statements are wrong

5. the distance traveled by a body is given by S=8t^2-8t^3 , it is moving with

• uniform velocity
• uniform acceleration
• variable acceleration
• variable retardation

6. look at the velocity time graph.The graph is for a body

• starting from rest and moving with uniform velocity
• moving with uniform retardation
• moving with uniform acceleration
• having same initial and final velovity

7. Two parallel rail tracks run North -South.Train A moves North with a speed 54 km/h and train B moves South with a speed of 90 km/h. The relative speed of B with respect to A is

• 40 m/s towards north
• 40 m/s towards south
• 10 m/s towards north
• 10 m/s towards south

8. The velocity acquired by the body moving with uniform acceleration is 40 m/s in 2 s and 60 m/s in 4 sec. The initial velocity is

• 20 m/s
• 10 m/s
• 30 m/s
• 5 m/s

9. A particle is dropped from the height 50 m. find the distance traveled in 3rd second of motion

• 20m
• 15m
• 22m
• 25m

10. which type of the motion is "the pendulum of a wall clock" ?

• vibratory
• translational
• circular
• none of the above