Important Questions: Motion and Measurement of Distances | Science Class 6 PDF Download

Very Short Answer Type Questions

Q1: Define motion.
Ans: Motion is the change in position of an object or body with respect to time.

Q2: What is the SI unit for length?
Ans: The SI unit for length is the meter (m).

Q3: Give an example of circular motion.
Ans: The blades of a ceiling fan.

Q4: What are rest and motion in relative terms?
Ans: Rest and motion are relative terms. An object can be at rest with respect to one object but in motion with respect to another.

Q5: Name one type of periodic motion.
Ans: The swinging of a cradle.

Q6: What is the oldest known wheel and where was it discovered?
Ans: The oldest known wheel was discovered in Mesopotamia, and it is believed to be over 5,500 years old.

Q7: What is the base measurement for the pyramids?
Ans: The base measurement for the pyramids is the cubit, which is equal to 18 inches.

Q8: What is the SI unit for measuring large distances?
Ans: The SI unit for measuring large distances is the kilometer (km).

Q9: What is the procedure to measure the length of a curved line using a string or thread?
Ans: Tie a knot at one end of the string, place the knotted end at one end of the curved line, stretch the string along the curve, mark the point where it reaches the other end, and measure the length of the string.

Q10: What is rectilinear motion?
Ans: Rectilinear motion is the motion of an object that moves in a straight line.

Short Answer Type Questions

Q11: Explain why standards for measurement were needed and how the SI system standardized measurements.
Ans: Standards were needed for consistency in measurements. The SI system introduced standardized units like meters and kilometers, ensuring uniformity in measurements worldwide.

Q12: Describe the procedure for measuring the length of an object using a ruler.
Ans: Place the ruler along the edge of the object, aligning the zero mark with one end, and note the reading at the other end. Ensure the eye is directly in line with the reading for accuracy.

Q13: Provide examples of circular motion in everyday life.
Ans: Examples of circular motion include the hands of a clock, a spinning top, and the wheels of a moving vehicle.

Q14: Explain how a body can display both rectilinear and circular motion simultaneously.
Ans: A moving car displays rectilinear motion on the road, while its wheels, which rotate, display circular motion.

Q15: Differentiate between rest and motion in relative terms with examples.
Ans: Rest and motion are relative terms. For instance, a person on a moving train is at rest with respect to fellow passengers but in motion with respect to an observer on the ground.

Long Answer Type Questions

Q16: Discuss the historical development of measurement standards and the transition to the SI system.
Ans: Measurement standards evolved from non-standard units like palms and fingers to the SI system, which introduced standardized units like meters and kilometers. This transition ensured global uniformity in measurements.

Q17: Explain the procedure for measuring the length of a curved line using a non-stretchable string or thread.
Ans: To measure a curved line, tie a knot to one end of the string, place it along the curve, mark where it reaches the other end, and measure the length of the string.

Q18: Describe the concept of rest and motion as relative terms with real-world examples.
Ans: Rest and motion are relative terms. A tree may be at rest with respect to a building, but both are in motion relative to an observer on a moving train. Provide examples to illustrate this concept.

Q19: Explain the types of motion, including rectilinear, circular, and periodic motion, with suitable examples for each.
Ans: Rectilinear motion is motion in a straight line (e.g., a train on a track), circular motion is motion in a fixed distance from a point (e.g., spinning top), and periodic motion repeats at regular intervals (e.g., a pendulum).

Q20: Discuss the importance of accurate measurements in daily life and the role of standardized units in achieving consistency.
Ans: Accurate measurements are crucial in various aspects of daily life. Standardized units like the SI system ensure consistency, enabling people worldwide to communicate and work with precision. Give examples to highlight this importance.