SCIENCE CHAP10 MOTION & MEASUREMENT WORKBOOK WORK

 

Ch.10: Motion and Measurement of Distance

I. Fill in the blanks.
a) ______________and _______________motion are the two types of translator motion.
Ans: Rectilinear and curvilinear

b)	Length is the ____________ between any two points. Ans: distance

c) The SI unit of temperature is ______________.
Ans: Kelvin
II. Name the following.
a) A device used to measure the distance between two points.
Ans.: Measuring tape or ruler or a meter scale.
b) The motion of a swing.
Ans.: Periodic motion
c) A device used to measure the temperature of a body.
Ans.: Thermometer.
d) A unit of time which is equal to a tenth of a century.
Ans.: decade
e) The SI unit of mass.
Ans.: Kilogram.

III.	In the following questions, two statements are given- one labeled Assertion (A) and the other labeled Reason (R). Read the statements carefully and choose the correct alternative (A), (B), (C) and (D) as given below:
(A) (B)	Both A and R are true and R is the correct explanation of the assertion. Both A and R are true but R is not the correct explanation of the assertion.

(C) A is true but R is false.
(D) A is false but R is true.
Assertion: Rest and motion are relative terms.
Reason: An object appears to be in motion in relation to one observer and may appear to
be at rest in relation to the other observer.
Ans: (A) Both A and R are true and R is the correct explanation of the assertion.

IV.	Answer the following questions in brief. (2 to 3 lines) a) Enlist two olden means and two modern means of transport.

Ans.: Old means of transport: bullock carts and horse carts
Modern means of transport: buses and cars
(answers may vary accept all the correct responses)
b) A wooden plank is placed alongside a meter scale. The reading at one end of the
plank on the scale is 37 and at the other end it is 84. Both the readings are in
centimeters.
Determine the length the plank.
Ans.: The length of the plank = subtraction of the readings at the two ends
= 84 – 37 = 47cm
Thus, the length of the plank is 47 cm.
c) Explain one practical method to measure the length of a curved line.
Ans.:
i. Take a thread and put it on the curved line in such a way that it coincides with
the curved line.
ii. Then measure the length of the thread after cutting the rest of the noncoinciding thread.
iii. Thus the length of curved line can be measured easily.
V. Define the following.
a) Physical quantity:
Ans.: A quantity that can be measured and expressed in numbers is called a
physical quantity.
b) Translatory Motion:
Ans.: An object is said to be translatory motion if it moves as a whole and all the
parts cover the same distance in the same interval of time.
c) Periodic motion:
Ans.: A motion that repeats itself at regular intervals of time is called a periodic
motion.
VI. Answer the following questions in detail. (3 to 4 lines)
a) Why are standard units of measurement preferred over ancient units of
measurement?
Ans.:
i. Ancient units of measurement are based on body parts of human such as
arms and feet.
ii. Therefore, they are not accurate because the body parts vary in size from
one person to person.
iii. The system of standard units of measurement makes it possible that a
person from one part of the world can measure a quantity with the same
accuracy as the other person in the other part of the world.
b) Convert the following measurements into m.
i. 380 cm
ii. 54200 mm
iii. 6.3 km
Ans.:

VII. Observe the given pictures and answer the questions that follow.
a) The length of an object is measured using the ruler given below. What is its length in
milimetres ?
Ans.:

Size of the object = 6.5cm-3 cm= 3.5 cm =3.5×10mm= 35mm
b) Find out the length of (𝑥) in cm with help of the diagram.

Ans.:
X = (8 cm-2.5 cm)-1.5 cm
= 5.5 cm – 1.5 cm
= 4 cm
VIII. Word Search
Find the following words hidden in the puzzle. The words may be hidden in any direction –
horizontal, vertical, diagonal, from left to right, top to bottom.

a) Coincide

b) Precaution

c) Translatory

d) Periodic

e) Stationary

Ans.:

How would you measure the thickness of a single sheet of paper with a ruler? (In this
case, only one sheet of paper is available.)
Ans.:

i. Ans.: i       The thickness of a sheet of paper can be measured with the help of an ordinary ruler by folding the sheet of paper large number of times. ii     After measuring the folded paper, divide the reading of the ruler with the number of times the paper has been folded. iii   Then, the thickness of the paper can be obtained. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

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Higher Order Thinking Skills (HOTS)
questions