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CBSE Class 6  >  Class 6 Notes  >  Science  >  Very Short Question Answers: Measurement of Length and Motion

Very Short Question Answers: Measurement of Length and Motion | Science for Class 6 PDF Download

Q1: What is the SI unit of length?
Ans: Metre (m).

Q2: How many centimetres are in a metre?
Ans: 100 centimetres.

Q3: What body part was commonly used for measurement in the past?
Ans: Handspan or cubit.Very Short Question Answers: Measurement of Length and Motion

Q4: What is the smallest unit of length in a centimetre?
Ans: Millimetre (mm).

Q5: How can measuring with different handspans lead to errors?
Ans: Variability in handspan size.

Q6: What should you do if a scale's ends are broken?
Ans: Use a full mark as the starting point.

Q7: What is the purpose of the International System of Units?
Ans: To standardise measurements globally.

Q8: How should the scale be positioned when measuring?
Ans: In contact with the object.

Q9: What is the correct way to write units of length?
Ans: Lowercase letters with a space before the number.

Q10: How do visually challenged students measure lengths?
Ans: Using special scales with raised markings.

Q11: What is a reference point?
Ans: A reference point is a fixed point used to describe the position of an object.Very Short Question Answers: Measurement of Length and Motion

Q12: Give an example of a reference point in daily life.
Ans: The bus stop is in front of my house.

Q13: What ensures accurate measurements of positions?
Ans: Using consistent reference points ensures accuracy in measurements.

Q14: When is an object considered to be in motion?
Ans: An object is in motion if its position changes relative to a reference point.

Q15: What type of motion occurs along a straight line?
Ans: Rectilinear motion occurs when an object moves along a straight line.

Q16: Name an example of circular motion.
Ans: The motion of a merry-go-round is circular motion.

Q17: What is oscillatory motion?
Ans: Oscillatory motion involves movement back and forth about a fixed position.Very Short Question Answers: Measurement of Length and Motion

Q18: What defines periodic motion?
Ans: Periodic motion repeats its path after a fixed interval of time.

Q19: List one traditional method of measurement.
Ans: Using body parts for measurement was a traditional method.

Q20: What is the importance of standard units of measurement?
Ans: Standard units provide a uniform way of measuring for consistency.

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FAQs on Very Short Question Answers: Measurement of Length and Motion

1. What is the difference between distance and displacement in motion?
Ans. Distance is the total path length travelled by an object, while displacement is the shortest straight-line distance between starting and ending positions, including direction. For example, walking 5 km north then 3 km south gives 8 km distance but 2 km displacement northward. Displacement is a vector quantity; distance is scalar.
2. How do you measure length accurately using a metre scale in Class 6 science?
Ans. Place the metre scale with zero mark at one end of the object being measured. Ensure the scale lies flat against the object without tilting. Read the measurement at the other end, keeping your eye level with the scale to avoid parallax error. For precision, always use the correct end of the scale and note measurements in centimetres or metres.
3. What are the different units used for measuring length and when should each be used?
Ans. Standard length measurement units include millimetre (mm) for very small objects, centimetre (cm) for medium objects, metre (m) for larger distances, and kilometre (km) for very long distances. Millimetres measure thickness; centimetres measure notebooks; metres measure room dimensions; kilometres measure distances between cities. Choosing the right unit depends on object size.
4. Why is speed different from velocity and how do we calculate motion speed?
Ans. Speed measures how fast an object moves (distance per time), while velocity includes direction (displacement per time). Speed is calculated as distance ÷ time. For example, a car travelling 100 km in 2 hours has speed of 50 km/h. If it moved 100 km north, its velocity is 50 km/h north. Speed is always positive; velocity can be negative.
5. What common mistakes do students make when measuring objects with a ruler in practical exams?
Ans. Common errors include: starting measurement from 1 cm instead of zero mark, tilting the scale sideways, placing eyes at an angle causing parallax error, and misreading measurements between markings. Students also forget to note units or measure curved objects incorrectly. To avoid these, always align zero properly, keep eyes perpendicular to scale, and practise reading intermediate values accurately during CBSE practical assessments.
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