CHAPTER 2
Practice Set 1
Measurement
Grade 6 Science • Maharashtra State Board • 30 Marks
Q.1 (A) Choose the correct option.
4 Marks
(1) Which of the following is a non-standard unit of length?
(2) Which unit is suitable for measuring the distance between two cities?
(3) Which instrument is most suitable for measuring the circumference of a ball?
(4) Which thermometer can measure body temperature quickly without touching a person?
Q.1 (B) Fill in the blanks.
4 Marks
(1) One centimetre is divided into ten equal parts called .
(2) The fixed point from which a distance is measured is called a .
(3) A thermometer used to measure body temperature is called a thermometer.
(4) The normal temperature of the human body is approximately .
Q.2 State whether true or false. Correct the false statement.
3 Marks
(1) Measurements taken with the hand spans of different people may vary.
(2) A kilometre is smaller than a metre.
(3) Touching an object tells us its exact temperature.
Q.3 Match the pairs.
4 Marks
| Group A | Group B |
|---|---|
| (1) Length of a piece of chalk | (a) Flexible measuring tape |
| (2) Height of a door | (b) Laboratory thermometer |
| (3) Circumference of a tree trunk | (c) 15 cm ruler |
| (4) Temperature of boiling liquid | (d) Metre scale or measuring tape |
Q.4 Answer in one or two sentences.
4 Marks
(1) Why are measurements made using footsteps not always the same?
(2) What is meant by standard measurement?
(3) Why should the object being measured be in direct contact with the ruler?
(4) What is the function of the liquid inside the bulb of a laboratory thermometer?
Q.5 Give scientific reasons.
3 Marks
(1) A flexible measuring tape is used to measure a curved surface.
(2) A thermometer must be used to determine accurate temperature.
(3) The bulb of a laboratory thermometer should not touch the bottom or sides of the container.
Q.6 Complete the following conversions.
3 Marks
(1) 3 metres = centimetres
(2) 5 centimetres = millimetres
(3) 2 kilometres = metres
Q.7 Apply your knowledge.
5 Marks
(1) The zero mark of a ruler is broken. An object begins at the 2 cm mark and ends at the 11 cm mark. Find the length of the object and state the method used.
(2) A student holds a laboratory thermometer at an angle and observes the liquid level from above. Identify the two mistakes and state the correct method.
CHAPTER 2
Practice Set 1 – Solutions
Measurement
Q.1 (A) Choose the correct option.
(1) Non-standard unit of length
Answer: (c) Hand span
(2) Unit for the distance between cities
Answer: (d) Kilometre
(3) Instrument for the circumference of a ball
Answer: (b) Flexible measuring tape
(4) Non-contact thermometer
Answer: (c) Infrared thermometer
Q.1 (B) Fill in the blanks.
(1) Ten equal parts of a centimetre
Answer: Millimetres
(2) Fixed point used while measuring distance
Answer: Reference point
(3) Thermometer used for body temperature
Answer: Clinical or medical thermometer
(4) Normal human body temperature
Answer: Approximately 37°C
Q.2 True or false. Correct the false statement.
(1) Measurements taken with different hand spans may vary.
True.
(2) A kilometre is smaller than a metre.
False.
A kilometre is larger than a metre. One kilometre is equal to 1000 metres.
(3) Touching an object tells us its exact temperature.
False.
Touch only gives a relative sensation of hotness or coldness. A thermometer is required to measure exact temperature.
Q.3 Match the pairs.
| Correct Pair | Appropriate Instrument |
|---|---|
| (1) – (c) | Length of a piece of chalk — 15 cm ruler |
| (2) – (d) | Height of a door — Metre scale or measuring tape |
| (3) – (a) | Circumference of a tree trunk — Flexible measuring tape |
| (4) – (b) | Temperature of boiling liquid — Laboratory thermometer |
Q.4 Answer in one or two sentences.
(1) Why are measurements made using footsteps not always the same?
Answer: The length of a footstep varies according to a person’s age and body size. Therefore, different people may obtain different measurements.
(2) What is standard measurement?
Answer: A system in which everyone uses a fixed and uniform unit so that the measurement remains the same regardless of who measures it is called standard measurement.
(3) Why must an object be in direct contact with the ruler?
Answer: Direct contact allows the object’s edges to align properly with the ruler markings and helps us obtain its accurate length.
(4) What is the function of the liquid inside a laboratory thermometer?
Answer: When the bulb receives heat, the mercury or coloured alcohol expands and rises through the capillary tube. Its stabilized level indicates the temperature.
Q.5 Give scientific reasons.
(1) A flexible measuring tape is used for a curved surface.
Answer: A flexible tape can bend and follow the complete curved surface of an object. A rigid ruler cannot follow such a curve accurately.
(2) A thermometer is required for accurate temperature.
Answer: The sensation of hotness or coldness can vary from person to person. A thermometer provides an exact temperature reading.
(3) The thermometer bulb must not touch the container.
Answer: If the bulb touches the bottom or sides, it may measure the temperature of the container instead of only the substance. This can give an inaccurate reading.
Q.6 Complete the conversions.
(1) 3 metres
Answer: 300 centimetres
3 × 100 = 300 cm
(2) 5 centimetres
Answer: 50 millimetres
5 × 10 = 50 mm
(3) 2 kilometres
Answer: 2000 metres
2 × 1000 = 2000 m
Q.7 Apply your knowledge.
(1) An object begins at 2 cm and ends at 11 cm.
Answer: Subtract the initial reading from the final reading.
Length = Final reading − Initial reading
Length = 11 cm − 2 cm = 9 cm
Therefore, the object is 9 cm long.
Length = 11 cm − 2 cm = 9 cm
(2) Thermometer held at an angle and observed from above
Answer: The two mistakes are:
- The thermometer is held at an angle instead of straight and vertical.
- The liquid level is observed from above instead of at eye level.