Class-6 Science, Chapter-10 Motion and Measurement of Distances, Additional exercises with solutions in line with NCERT book / CBSE Syllabus
Chapter 10
Motion and Measurement of Distances
=========================================================
Exercises from
textbook
Additional
Exercises
Tables from
Textbook
Activities/Projects
Additional Exercises
Choose the correct answer;
1.
How
did people not move or carry goods long ago?
a.
On
their back
b.
Using
animals
c.
Using
motor vehicles (√)
2.
Which
of the following is a standard unit of measurement?
a.
Length
of foot
b.
Width
of finger
c.
Cubit
d.
Metre
(√)
3.
Which
of the following was not used as small length measurement in ancient India?
a.
Centimetre
(√)
b.
Angul
(finger)
c.
mutthi
(fist)
d.
balisht
(handspans)
4.
To
measure length we use
a.
meter
scale (√)
b.
liter
c.
Kilogram
d.
Thermometer
5.
In
one decimeter there are
a.
1
cm
b.
10
centimetre (√)
c.
100
cm
d.
1000
CM
6.
To
measure the time difference in sports competitions we use
a.
Wall
clock
b.
Railway
clock
c.
Sun
clock
d.
Stopwatch
(√)
7.
The
replicas of International standard units are placed under the security at
a.
Ahmedabad
b.
Bangalore
c.
Calcutta
d.
New
Delhi (√)
8.
Object
which does not change its position with time is said to be
a.
Moving
object
b.
Still
object (√)
c.
Fast
object
d.
None
of the above
9.
Kite
flying in the sky is an example of
a.
Linear
motion
b.
Circular
motion
c.
Irregular
motion (√)
d.
Periodic
motion
10. The SI unit for Speed is
a.
Centimetre
per second
b.
Kilometre
per second
c.
Metre
per second (√)
d.
Kilometre
per hour
10 times of a
millimetre is called centimetre.
There are 1000
metres in a kilometre.
The SI unit of
length is metre.
Kilogram is the
standard unit of mass.
Kelvin is the
SI unit of temperature.
Match the column
A
|
B
|
Length
|
kilogram
|
Time
|
kelvin
|
Temperature
|
second
|
Mass
|
metre
|
Ans-
A
|
B
|
Length
|
metre
|
Time
|
second
|
Temperature
|
kelvin
|
Mass
|
kilogram
|
Match these motions with
the type of motion:
A
|
B
|
Motion of a car
|
non periodic motion
|
Motion of the blades of
a fan
|
oscillatory motion
|
Motion of a swing
|
linear motion
|
Motion of a flying bird
|
circulatory motion
|
Ans-
A
|
B
|
Motion of a car
|
linear motion
|
Motion of the blades of
a fan
|
circulatory motion
|
Motion of a swing
|
oscillatory motion
|
Motion of a flying bird
|
non periodic motion
|
State whether the
following statements are true or false:
1.
For
Transport along water routes boats were used from ancient times. (True)
2.
Thermometer
is used to measure wind speed. (False)
3.
Motion
that repeats itself after some period of time is called non-periodic motion.
(False)
4.
Shapes
of boats imitated shapes of animals living in water. (True)
5.
Invention
of wheel made a great change in Modes of transport. (True)
6.
A
cubit is the length from the elbow to the fingertips. (True)
7.
Each
metre (m) is divided into 100 equal divisions, called centimetre (cm) (True)
8.
Each
centimetre has 10 equal divisions, called millimetres (mm) (True)
9.
The
replicas of standard units are placed under Security at' national Physical
Laboratory' new Delhi. (True)
10. The change in position can be determined
through time measurements. (False)
Answer the following
questions:
Q.
Name some modern means of communication.
Ans- Some
modern means of communication are follows:
1. Electric trains
2. Mono Rail
3. Supersonic aeroplanes
4. Spacecraft
Q.
Mention some applications of measurement in daily life.
Ans- Some
applications of measurement in daily life are as follows:
1 - The tailor
needs to measure the length of cloth to know if it is enough to stitch a dress.
2 - A carpenter
needs to measure the height and width of a cupboard to know how much would he
need to make it's door.
3 - A farmer
needs to know the length and breadth of the area of his land to know how much
seat he can sow how much water would be needed for his crops.
4 - We need to
measure our height to know how tall are we.
Q.
What do you understand by measurement?
Ans-
Measurement means the comparison of an unknown quantity with some known
quantity. This known quantity is called a unit.
The result of
measurement is expressed in two parts. One part is number and the other part is
the unit of measurement.
For example
- The length of my
table is 4 hand spans. Here 4 is the number and 'handspan' is the unit of
measurement.
Q.
Why do we need standard units of measurement?
Ans- We need
standard units of measurement as they do not change from person to person.
For example
length of fort hand span varies from person to person.
Q.
Have you seen someone using non standard unit measurement? Where?
Ans- Flower
sellers use their forearm as a unit of length for measuring garlands.
Q.
For measuring large distances, metre is not a convenient unit. How do we
measure large distances in SI unit?
Ans- For
measuring large distances, metre is not a convenient unit. We use the unit
called kilometre for it.
1 km is equal
to 1000 m.
Q.
You cannot measure the girth of a tree or the size of your chest using a metre
scale. How would you measure them?
Ans- We cannot
measure the girth of a tree or the size of our chest using a metre scale. We
will use a measuring tape for these measurements.
Q.
What are the precautions that we need to take while measuring the length?
Ans- We need to
take following precautions while measuring the length:
1 - Scale
should be in contact with the object along its length.
2 - We should
take measurements from the zero mark of the scale.
3 - If the zero
mark of scale is not visible, we can any other full mark on the scale. Then
first subtract the reading of this mark from the reading at the other end.
4- Our eye must
be exactly in front of the point where the measurement is to be taken.
Q.
Name some sub standard units.
Ans- Following
are the names of some sub standard units of measurement.
Angul
Muthi
balisht
Hath
Kadam (steps)
Q.
What is motion? Explain rectilinear motion, circular motion, periodic motion.
Ans- Motion is
a change in the position of an object with time.
Rectilinear
motion - when an object
moves along a straight line, its motion is said to be rectilinear motion.
For example -
the Falling of a stone, sprinter in a 100m race, vehicles on a straight road,
march- past of soldiers in a parade.
Circular
motion - any object
moving on a circular path is said to be in circular motion.
For example -
the motion of a point marked on the blade of an electric fan or the hands of a
clock.
Periodic
motion - when object or
a part of it repeats its motion after a fixed interval of time, it is said to
be in periodic motion.
Example -
motion of a pendulum, motion of a child on a swing, a guitar or the surface of
Drums being played.
Exercises from
Textbook
Give two examples of each, of modes of transport used on land water and air.
Ans- Modes of transport used on land -
Train
Bus
Modes of transport used on water -
Ship
Submarine
Modes of transport used in air
Airplane
Spacecraft
Fill in the blanks:
1. One metre is equal to 100 cm.
2. Five kilometre is equal to 5000 m.
3. Motion of a child on a swing is periodic motion.
4. Motion of the needle in a sewing machine is periodic motion.
5. Motion of the wheel of a bicycle is circular motion.
Why can pace or a footstep not be used as a standard unit of length?
Ans- The length of a pace or a footstep varies from person to person. Therefore, this cannot be used as standard unit of length.
Arrange the following lengths in their increasing magnitude:
1 m, 1 cm, 1 kilometre, 1 millimetre
Ans- These lengths can be arranged in the order of increasing magnitude as below:
1 millimetre, 1 centimetre, 1 metre, 1 kilometre, 1 millimetre
The height of a person is 1.65 m. Express it into centimetre and millimetre.
Solution-
Given -
Height of person= 1.65 metre
1 m = 100 centimetre
1.65 m = 1.65 x 100 = 165 centimetre
1 m = 1000 millimetre
1.65 m = 1.65 x 1000 = 1650 millimetre
The distance between Radha's home and her school is 3250 m. Express this distance into kilometres.
Solution
Given-
Distance = 3250 m
1000 m = 1 kilometre
3250 m = 3250/ 1000 = 3.25 kilometre
While measuring the length of a knitting needle, the reading of the scale at women and is 3.0 cm and at the other end is 33.1 cm what is the length of the needle?
Solution-
Actual length of the needle= reading at the other end- reading at the first end
= 33.1 - 3.0
= 30.1 cm
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Similarities-
Motion of any point on the blades of fan and _______ is circular.
Difference-
Motion of bicycle is horizontal while the motion of ceiling fan is vertical.
Tables from Textbook
Table 10.1 Measuring length and breadth of classroom
Name
of student
|
Length
of the classroom
|
Width
of the classroom
|
1
|
||
2
|
||
3
|
Table 10.2
Measuring width of a table
Who
measured the width of the table?
|
Number
of handspan
|
1
|
|
2
|
|
3
|
Table 10.3
Measurement of height
Who
measured the height
|
Height
in handspans
|
Height
in cm
|
1
|
||
2
|
||
3
|
Table 10.4 Objects in rest and motion
Objects
in rest
|
Objects
in motion
|
House
|
A flying bird
|
Table
|
Second’s hand of the
clock
|
Clock
|
A fish in water
|
A stone
|
A horse
|
A wall
|
Butterfly
|
Sofa
|
Moving train
|
Clock
|
Hands of clock
|
Tree
|
Ants
|
Projects and
activities-
1-
Draw
a map of your classroom. Roll a ball on the floor. In your map mark the points
where the ball started and where it stopped. Show also the path it moved along.
Did the ball move along? Did the ball move along a straight line?
2-
Using
a string and a scale, let each student measure the length of his / her foot.
Prepare a bar graph of the foot length measurements that have been obtained for
the whole class.
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