Q1: Some lengths are given in Column I of Table 5.5. Some units are given in Column II. Match the lengths with the units suitable for measuring those lengths.Table 5.5
Ans:
Q2: Read the following statements and mark True (T) or False (F) against each.
(i) The motion of a car moving on a straight road is an example of linear motion.
Ans: True
(ii) Any object which is changing its position with respect to a reference point with time is said to be in motion.
Ans: True
(iii) 1 km = 100 cm
Ans: False
Q3: Which of the following is not a standard unit of measuring length?
(i) millimetre
(ii) centimetre
(iii) kilometre
(iv) handspan
Ans: (iv) handspan
Q4: Search for the different scales or measuring tapes at your home and school. Find out the smallest value that can be measured using each of these scales. Record your observations in a tabular form.
Ans: Observations of Different Scales or Measuring Tapes:
Q8: You are given a coin. Estimate how many coins are required to be placed one after the other lengthwise, without leaving any gap between them, to cover the whole length of the chosen side of a notebook. Verify your estimate by measuring the same side of the notebook and the size of the coin using a 15cm scale.
Ans:
Q9: Give two examples each for linear, circular and oscillatory motion.
Ans:
Q10: Observe different objects around you. It is easier to express the lengths of some objects in mm, some in cm and some in m. Make a list of three objects in each category and enter them in the Table 5.6.Ans:
Q12: Tasneem wants to make a metre scale by herself. She considers the following materials for it  plywood, paper, cloth, stretchable rubber and steel. Which of these should she not use and why?
Ans: Tasneem should not use stretchable rubber to make a metre scale.
Reason: Stretchable rubber is not suitable for making a measuring scale because it can stretch and deform easily, leading to inaccurate measurements. A metre scale needs to be rigid and nonstretchable to ensure that the measurements are consistent and reliable.
Better Options
Stretchable rubber should be avoided as it can change its length when stretched, which would not give consistent measurements.
Q13: Think, design and develop a card game on conversion of units of length to play with your friends.
Ans: Card Game: Length Master
Objective: Convert units of length correctly to win cards.
Setup
Length Cards: Each card has a length with a unit (e.g., 2 m, 150 cm).
Conversion Cards: Each card asks for a specific conversion (e.g., Convert to cm).
Reference Cards: Show conversion formulas (e.g., 1 m = 100 cm).
Rules: Draw one Length Card and one Conversion Card.
99 videos260 docs49 tests

1. How can we measure length accurately? 
2. What is the difference between distance and displacement? 
3. How do we calculate speed using the formula? 
4. What is the difference between speed and velocity? 
5. Why is it essential to measure length accurately in scientific experiments? 

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