Worksheet Solutions: Measurement of Length and Motion - 2 | Science for Class 6 PDF Download

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Q1: Fill in the blanks:

(i) Measurement is the comparison of an unknown quantity with some              quantity.
Ans: fixed

(ii) 1 km =            m.
Ans: 1000

(iii) Standard unit of length is              .
Ans: metre

(iv) The length of curved line can be measured using a               .
Ans: thread

(v)              is the distance between two points or ends of an object.
Ans: Length

(vi)                   means the change in position of an object with time.
Ans: Motion

Q2: True/False

(i) The choice of device used for the measurement depends on the type of measurement to be made. 
Ans: True

(ii) Our senses are reliable for accurate measurement. 
Ans: False

(iii) 1m = 100cm. 
Ans: True

(iv) 5km = 5000cm. 
Ans: False

(v) Motion of a child on a swing is periodic motion. 
Ans: True

(vi) Motion of a wheel of a cycle is random motion. 
Ans: False

Q3: Which measuring device can be used to measure the girth of a tree?
Ans: Measuring tape

Q4: Write the type of motion in which a body moves along a straight path.
Ans: Rectilinear or linear motion

Q5: Which unit of length is used to measure a large distance?
Ans: Kilometre

Q6: Write one example of circular motion.
Ans: Motion of hands of a clock

Q7: Write one example of rectilinear motion.
Ans: Motion of an apple falling from a tree

Q8: Write one example of periodic motion.
Ans: A bouncing ball

Q9: Name the type of motion in which a body moves along a curved path.
Ans: Circular or Rotational motion

Q10: Name the type of motion in which motion repeats after equal time interval.
Ans: Periodic motion

Q11: The distance between Ria’s house and temple is 1340 m. Express this distance in kilometre.
Ans: 1 km = 1000m
1340/1000 = 1.340 km

Q12: Find the length of square in mm.

Ans: Each side = 5 x 10 = 50mm (All sides of square are equal)

Q13: Define ‘unit’.
Ans: The fixed quantity with which we compare an unknown quantity is called unit.

Q14: When object is said to be in rest?
Ans: If the position of an object does not change with time, it is said to be at rest.

Q15: What do you understand by ‘measurement’?
Ans: Measurement means the comparison of some unknown quantity with a known fixed quantity of same kind.

Q16: What is the common in between hand span, pace, angul and fist?
Ans: All of these are non-standard units of measurement that changes from person to person.

Q17: When object is said to be in motion?
Ans: When an object changes its position with time with respect to another object, it is said to be in motion.

Q18: Why is the hand span not considered as a reliable unit for measuring the length?
Ans: Hand span is not considered as a reliable unit for measuring the length because length of hand span varies from person to person.

Q19: What do you understand by standard unit of measurement?
Ans:The unit which is acceptable to the majority of people as a basic unit of measurement is called standard unit of measurement.

Q20: Assertion and Reason Questions
(i) Assertion (A): Motion of moon around the earth is a circular motion.
Reason (R): In a circular motion, the distance of object from a fixed point remains the same.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)

(ii) Assertion (A): In ancient times bullock cart was used as a means of transport.
Reason (R): Aeroplanes were developed only in 1800 AD.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (c)

(iii) Assertion (A): The motion of a ball rolling on the ground is nothing but a rectilinear motion.
Reason (R): The motion of ball rolling on the ground is a combination of different types of motion.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (d)