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Class seven science Motion and Time Short answers

# Chapter 13: Motion and Time

#### Objective Questions

A. Write whether the following statements are True/False:

1. Speed is the total distance covered multiplied by the total time taken.

2. If the speed of an object, moving along a straight line keeps changing, its motion is said to be Uniform motion.

3. An object moving along a straight line with a constant speed is said to be in non-uniform motion.

4. The basic unit of time is second.

5. The device used to measure speed is called speedometer.

6. The meter that measures the distance moved by the vehicle is called

thermometer.

1. False 2. False 3. False 4. True 5. True 6. False

1. B 2. A 3. D 4. C

#### C. Fill in the blanks:

1. The distance covered by an object in a unit time is taken as the ________ of that object.

2. When we say that a car is moving with a speed of 50 kilometres per hour, it implies that it will cover a distance of _________

kilometres in one hour. 3. _________ is the total distance covered

divided by the total time taken.

4. An object moving along a straight line with a constant speed is said to be in _______ motion.

5. The metallic ball is called the _____ of the pendulum.

6. One ___________ is one millionth of a second.

1. Speed

2. 50

3. Speed

4. Uniform

5. Bob

6. Microsecond

#### Very short Questions

1. What is a speedometer?

2. Define Speed?

3. What do you understand by Oscillation motion?

4. What is a simple pendulum?

5. What is a bob of the pendulum?

6. Define average speed?

7. Name the basic unit of time?

1. The speedometer is an instrument that indicates the speed of a vehicle.

2. The distance moved by an object in a unit time is called its speed.

3. The to and fro motion of an object is called oscillatory motion.

4. A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread.

5. The metallic ball is called the bob of the pendulum.

6. Average speed is the total distance covered divided by the total time taken.

7. The basic unit of time is second. Its symbol is s.

#### B. Short Questions:

1. Differentiate between Uniform and Non-uniform speed?

2. What is a quartz clock?

3. What is the Oscillation of a pendulum?

4. List different types of motion?

5. Describe one complete oscillation of a pendulum.

6. How time was measured in ancient time?

1. An object moving along a straight line with a constant speed is said to be in uniform motion. If the speed of the object moving along a straight line keeps varying, its motion is said to be non-uniform.

2. Nowadays most clocks or watches have an electric circuit with one or more cells. These clocks are called quartz clocks.

3. One complete to and fro motion of a pendulum from rest position is called one oscillation. The time taken by the pendulum to complete one oscillation is termed as its time period. The time period of a pendulum depends on the length of the string of pendulum.

4. The different types of motion are –

a. Translatory motion

b. Rectilinear motion

c. Curvilinear motion

d. Rotatory motion

e. Vibratory motion

5. One complete to and fro motion of a pendulum from rest position is called one oscillation. The time taken by the pendulum to complete one oscillation is termed as its time period. The Time period of a pendulum depends on the length of the string of pendulum. VI. Many time measuring devices were used in different parts of the world before the pendulum clocks became popular. Sundials, and clocks and water clocks are some examples of such devices.

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