Page 173 - Science Class 07

3. _____________ clocks display me in digits.
4. Rest and mo on are defined on the basis of the change of the _____________ of the
object with me.
5. _____________ is calculated by dividing the distance covered by an object by the me
taken.

C. Match the following columns.
Column I Column II
1. Pendulum a. 1926
2. Quartz clock b. Unequal distance in equal interval of me
3. Sundial c. Metre per second

4. Speed d. Speed in km
5. Odometre e. 1656
6. Non-uniform mo on f. Maharaja Jai Singh
D. Very short answer ques ons.
1. What do you mean by sundial?

2. Write any three modern me measurement devices.
3. Why do we use stopwatch.
4. What is rest?

5. What is speed?
6. What is uniform mo on.
E. Short answer ques ons.
1. In ancient me, how people used to measure me?

2. How do we measure me with the help of a sand clock?
3. Write the working of a pendulum.
4. What do you mean by quartz watches?

5. Differen ate between rest and mo on.
6. Differen ate between uniform and non-uniform mo on.
F. Long answer ques ons.
1. Explain the me measurement devices used in the ancient me.

2. Explain the differences between quartz watch and digital watch.
3. What do you mean by speed? How can you calculate the speed if the me and distance is
given?
4. Explain about the devices used to measure distance and speed of a moving object.

Project
Project ActivityActivityActivity
Project
Project Activity
A. Make a model of sundial using thermocol, s cks, etc. and try to measure me with the help of
the shadow casted by the sun.
B. The radius of a wheel of a cycle in 35 cm. How much distance it will cover if the wheel moves
105 mes.

Science-7 173