CBSE Class 6 Science Motion and Measurement of Distances Assignment

Question 1. Match the following __
Column A                      Column B
1) Length                      a) 1000m
2) 1 Km                         b) 10m
3) Time                         c) meter
4) 1 m                          d) 100m
5) 1 cm                         e) sec
Answer:
1 - (c) Length - meter
2 - (a) 1 Km - 1000m
3 - (e) Time - sec
4 - (d) 1 m - 100m
5 - (b) 1 cm - 10m (Note: 1 cm = 0.01 m, matching standard options provided in basic worksheets)
In simple words: Standard units are matched with their respective physical quantities and conversions.

Exam Tip: Memorize standard SI units and conversion factors like \(1 \text{ km} = 1000 \text{ m}\) and \(1 \text{ m} = 100 \text{ cm}\).

Question 2(I). Which unit of length will you use to express the distance between New Delhi and Agra.
(a) m
(b) Km
(c) cm
(d) dm
Answer: (b) Km
Large distances between cities are measured in kilometers (Km) because meters or centimeters are too small for such long distances.
In simple words: Long distances are always expressed in kilometers.

Exam Tip: Use kilometers for inter-city distances, meters for room or building dimensions, and centimeters for smaller objects like books or pencils.

Question 2(II). 6.2 Km is equal to
(a) 6200 cm
(b) 620 cm
(c) 62 m
(d) 620000 cm
Answer: (d) 620000 cm
Since \(1 \text{ km} = 1000 \text{ m}\) and \(1 \text{ m} = 100 \text{ cm}\),
\(1 \text{ km} = 1000 \times 100 = 100000 \text{ cm}\).
Therefore, \(6.2 \text{ km} = 6.2 \times 100000 \text{ cm} = 620000 \text{ cm}\).
In simple words: Multiply the value in kilometers by 100000 to convert it into centimeters.

Exam Tip: Always write down conversion formulas step-by-step to avoid decimal placement errors.

Question 2(III). 1.45 m is equal to
(a) 145 mm
(b) 14500 mm
(c) 1450 mm
(d) 145000 mm.
Answer: (c) 1450 mm
Since \(1 \text{ m} = 1000 \text{ mm}\),
\(1.45 \text{ m} = 1.45 \times 1000 \text{ mm} = 1450 \text{ mm}\).
In simple words: Multiply meters by 1000 to get millimeters.

Exam Tip: Remember that milli means one-thousandth, so 1 meter contains 1000 millimeters.

Question 2(IV). Which measuring device will you use to measure the width of a tree?
(a) Divider
(b) Ruler
(c) Measuring tape
(d) All of the options
Answer: (c) Measuring tape
A tree trunk has a curved circumference and large width, which cannot be measured using a straight rigid ruler or divider. A flexible measuring tape is required to wrap around it.
In simple words: Flexible measuring tapes are best for measuring curved or thick objects like trees.

Question 3. Write types of Motion?
Answer:
1. Rectilinear motion (motion along a straight line)
2. Circular motion (motion along a circular path)
3. Periodic motion (motion that repeats itself at regular intervals of time)
In simple words: The three main types of motion studied in elementary physics are rectilinear, circular, and periodic.

Exam Tip: Be ready to give examples for each of these three fundamental types of motion in exams.

Question 4. Give 2 examples of rectilinear motion (straight line)?
Answer:
1. Soldiers marching in a parade
2. A car moving on a straight highway
In simple words: Rectilinear motion happens when an object travels along a straight line path.

Exam Tip: Another classic example is a falling stone under gravity.

Question 5. Give 2 examples of periodic motion?
Answer:
1. Motion of a simple pendulum
2. Motion of the earth around the sun (revolution)
In simple words: Periodic motion repeats again and again after equal intervals of time.

Exam Tip: Make sure not to confuse periodic motion with random or non-repeating motions.

Question 6. Identify the types of motion from the picture
Type of Motion
A) 1. Rectilinear motion (Train moving on tracks)
B) 2. Periodic motion (Pendulum of a clock)
3. Circular motion (Hands of a clock)
C) 4. Rotational motion (Blades of a ceiling fan)
Answer:
1. Rectilinear motion
2. Periodic motion
3. Circular motion
4. Rotational motion
In simple words: Different objects display different kinds of motion depending on their path and rotation.

Exam Tip: Carefully observe whether an object is moving in a straight line, rotating about an axis, or repeating itself periodically.