Motion and Time Cl 7

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

(a) A to B and back to A

(b) O to A, A to B and B to A

(c) B to A, A to B and B to O

(d) A to B

• a)

• b)

• c)

• d)

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

(a) 2.1 s

(b) 4.2 s

(c) 21 s

(d) 8.40 s

• a)

• b)

• c)

• d)

A ………………… is one billionth of a second.

• second

• microsecond

• nanosecond

• minute

Speed =

• distance covered

• distance covered X time taken

• distance covered / time taken

• time taken / distance covered

When a body covers unequal distances in equal intervals of time then it is said to be in ............. motion

• uniform

• non uniform

• periodic

• vibratory

Earlier time measuring instrument

• 
• 
• 

In modern wrist watch , time is measured by the vibrations of a ................crystals

• Quartz

• Diamond

• GOLD

A distance time graph has distance as .............

• x and Y axis

• x axis

• Y axis

Device used to measure speed of a car is

• graph

• odometer

• speedometer

• none

What can you depict from the graph?

• object is in uniform motion

• object is in non uniform motion

• object has constant speed

• object is stationary