Class 6 Science Chapter 9 Measurement of Length and Motion

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Class 6 Science Chapter 9 Measurement of Length and Motion

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Measurement of Length and Motion

Chapter: 9

PART – II

EXERCISE

1. Match each item in Column Ⅰ with most appropriate units of column ⅠⅠ:

Column Ⅰ	Column ⅠⅠ
(a) Height of building	(i) cm
(b) Distance between two cities	(ii) m
(c) Length of pencil	(iii) mm
(d) Thickness of your notebook	(iv) km

Ans: 

Column Ⅰ	Column ⅠⅠ
(a) Height of building	(ii) m
(b) Distance between two cities	(iv) km
(c) Length of pencil	(i) cm
(d) Thickness of your notebook	(iii) mm

2. Classify the following objects based on the most appropriate measuring instrument: i.e. scale and measuring tape.

(a) Height of a building.

Ans: Measuring tape.

(b) Length of a pencil.

Ans: Scale. 

(c) Length of a paper clip.

Ans: Scale. 

(d) Circumference of the stem of a tree.

Ans: Measuring tape.

(e) Width of an eraser.

Ans: Scale.

(f) Length of football field.

Ans: Measuring tape.

3. True or false?

(a) 1 m = 100 cm.

Ans: True. 

(b) 5000 m = 5 cm.

Ans: False.

(c) 2000 mm = 2 cm.

Ans: False.

(d) Movement of a clock hand is an example of linear motion.

Ans: False.

(e) Motion in a straight line is called as oscillatory motion.

Ans: False.

4. Darken the circle of correct answer.

(i) Which of the following is an example of periodic motion?

(a) A bus moving in the road.

(b) A swing pendulum.

(c) A falling ball.

(d) A walking person.

Ans: (b) A swing pendulum.

(ii) Which of the following is an example of circular motion?

(a) A swing in motion.

(b) A moving train.

(c) A ceiling fan’s blade in motion.

(d) A moving cycle.

Ans: (c) A ceiling fan’s blade in motion.

5. Convert the following.

(a) 250 mm to m.

Ans: 250mm = 250​/1000m = 0.25m.

(b) 7.5 km to m.

Ans: 7.5km = 7.5×1000m = 7500m.

(c) 3 m to cm.

Ans: 3 m = 3×100 cm = 300 cm.

(d) 1.25 m to mm.

Ans: 1.25m = 1.25×1000mm = 1250mm.

6. Distance between your home and school is 2000 m, convert it into kilometer.

Ans: Distance = 2000m.

2000m = 2000/1000​km = 2 km

7. With the help of a thread measure the length of different objects around you, such as pencil, pen, geometry box etc. Express each length in millimeter, centimeter and record your findings in a table.

Ans: 

Object	Length (mm)	Length (cm)
Pencil	150	15
Geometry Box	200	20
Pen	140	14
Ruler	300	30
Eraser	50	5

8. Observe different objects in your classroom and classify them based on their length. Less than 10 cm, between 10 cm and 1 m and more than 1 m. Record your observations in appropriate table.

Ans: 

Less than 10 cm	Between 10 cm and 1 m	More than 1 m
Eraser	pencil	Classroom height
Chalk	Pen	Room length
Sharpener	Geometry Box	Hallway length

9. Ask three of your friends to stand against a wall. Mark their height on the wall. Now measure their height and express each measurement in meter and centimeter.

Ans: Height of Friends.

Friend	Height (cm)	Height (m)
Rahul	160	1.60
Priya	155	1.55
Rohan	162	1.62

10. Identify different types of motion in your surrounding: linear, circular and oscillatory. Give two examples for of motion.

Ans: 

Types of motion	Examples
(i) Linear Motion.	Car moving on a straight road, Falling stone.
(ii) Circular Motion.	Blades of a fan, Wheel of a bicycle.
(iii) Oscillatory Motion.	Swing, Pendulum of a clock.

11. Complete the table by referring to the diagram.

Ans: 

Reference point	Distance	Distance
Pritam	To Bikash  3 m	To Anima 3m
Ankur	To Gargi 3 m	To Pritam 6 m
Anima	To Pritam 3 m	To Bikash  6 m
Gargi	To Bikash 6 m	To Ankur 3 m

11. (b)  

Reference Points	Distance to Guwahati
A
B
C
D
	Distance to Raha
A
B
C
D
From Guwahati

Ans: 

Reference Points	Distance to Guwahati
A	20 km
B	40 km
C	60 km
D	80 km
	Distance to Raha
A	80 km
B	60 km
C	40 km
D	20km
From Guwahati	0 km