Rest and Motion grade 7

The time period of a simple pendulum is the time taken by it to travel from

• A to B and back to A

• B to A, A to B and B to O

• O to A, A to B and B to A

• A to B

A simple pendulum takes 42 sec. to complete 20 oscillations. What is its time period?

• 21 s

• 2.1 s

• 8.40 s

• 4.2 s

Time period of a simple pendulum depends upon its

• weight of bob

• length

• both (a) and (b)

• None of these

The correct symbol to represent the speed of an object is:

• 5 m/s

• 5 s/m

• 5 mp

• 5 m/s-1

Give the basic unit of speed.

(a)  

Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is

• 8.3

• 5

• 7.2

• 3.6

Nearly all the clocks make use of

• periodic motion

• straight line motion

• random motion

• circular motion

A bus travels 54 km in 90 minutes. The speed of the bus is

• 0.6 m/s

• 10 m/s

• 5.4 m/s

• 3.6 m/s

Which of the following cannot be used for measurement of time

• A leaking tap

• Simple pendulum

• Shadow of an object during the day

• Blinking of eyes

On which axis is dependent variable represented?

• Depends on the data

• y-axis

• x-axis

• On any axis