CHAPTER 2
Practice Set 3
Measurement
Grade 6 Science • Maharashtra State Board • 30 Marks
Q.1 (A) Choose the correct option.
4 Marks
(1) The Romans divided each foot into __________ equal parts.
(2) Which instrument is used for highly precise measurements of machine parts?
(3) Which organisation records temperatures at different locations in India every day?
(4) What information is commonly provided for major cities in newspapers and television news?
Q.1 (B) Complete the analogies.
4 Marks
(1) Length : Metre :: Mass :
(2) Mass : kg :: Time :
(3) Body temperature : Clinical thermometer :: Room temperature :
(4) Curved surface : Flexible measuring tape :: Smaller-than-millimetre measurement :
Q.2 Study the assertion and reason. Choose the correct relation.
3 Marks
Assertion: Machine parts require highly precise measurements.
Reason: Their matching parts must fit together perfectly.
Assertion: A person’s body temperature can be measured from a distance using an infrared thermometer.
Reason: An infrared thermometer works using infrared rays.
Assertion: Every laboratory thermometer has exactly the same range and the same value for each small division.
Reason: Laboratory thermometers are available with different ranges and scales.
Q.3 Complete the table.
4 Marks
| Quantity or Object | Suitable Unit | Suitable Instrument |
|---|---|---|
| Length of a line segment | ________________ | Ruler |
| Length and breadth of a playground | Metre | ________________ |
| Very small thickness of a machine part | Smaller range than a millimetre | ________________ |
| Temperature of air in a room | Degree Celsius | ________________ |
Q.4 Answer in one or two sentences.
4 Marks
(1) What did the Roman term “mille passus” mean?
(2) Why is a centimetre convenient for measuring a line segment?
(3) What happens to mercury or coloured alcohol when the thermometer bulb receives heat?
(4) How are daily temperature records used by the India Meteorological Department?
Q.5 Solve the following thermometer-scale questions.
4 Marks
The temperature difference between two big marks is 10°C, and there are 10 equal small divisions between them.
(1) What temperature does each small division represent?
(2) If the liquid level is six small divisions above the 20°C mark, what temperature is shown?
The liquid level in a thermometer stabilizes three small divisions above the 40°C mark. Each small division represents 1°C.
(3) What temperature is recorded?
(4) Why must the value of each small division be determined before taking a reading?
Q.6 Give scientific reasons.
3 Marks
(1) Special measuring instruments are used in machinery-producing factories.
(2) Different types of measuring tapes are used by cloth merchants, carpenters and surveyors.
(3) An infrared thermometer was especially useful during the COVID-19 pandemic.
Q.7 Apply your knowledge.
4 Marks
(1) A tailor must measure the length of a shirt, while a factory worker must measure the thickness of a small machine component. Can both use the same instrument? Name the suitable instrument for each and explain why.
(2) A thermometer is hanging on a wall without touching any particular object. What temperature will it show? Explain.
CHAPTER 2
Practice Set 3 – Solutions
Measurement
Q.1 (A) Choose the correct option.
(1) Number of parts in a Roman foot
Answer: (b) Twelve
(2) Instrument for precise machine-part measurements
Answer: (c) Vernier caliper
(3) Organisation recording temperatures daily
Answer: (a) India Meteorological Department
(4) Temperature information given for major cities
Answer: (b) Minimum and maximum temperatures
Q.1 (B) Complete the analogies.
(1) Length : Metre :: Mass : ______
Answer: Kilogram
(2) Mass : kg :: Time : ______
Answer: s
(3) Body temperature : Clinical thermometer :: Room temperature : ______
Answer: Wall thermometer
(4) Curved surface : Flexible measuring tape :: Smaller-than-millimetre measurement : ______
Answer: Screw gauge or Vernier caliper
Q.2 Assertion and Reason.
(1) Machine parts require precise measurements because matching parts must fit perfectly.
Answer: Both statements are true, and the reason explains the assertion.
Option (a)
(2) An infrared thermometer measures from a distance because it works using infrared rays.
Answer: Both statements are true, and the reason explains the assertion.
Option (a)
(3) Every laboratory thermometer has the same range and scale.
Answer: The assertion is false, but the reason is true.
Option (d)
Q.3 Complete the table.
| Quantity or Object | Suitable Unit | Suitable Instrument |
|---|---|---|
| Length of a line segment | Centimetre | Ruler |
| Length and breadth of a playground | Metre | Metre tape |
| Very small thickness of a machine part | Smaller range than a millimetre | Screw gauge or Vernier caliper |
| Temperature of air in a room | Degree Celsius | Wall thermometer |
Q.4 Answer in one or two sentences.
(1) What did “mille passus” mean?
Answer: Mille passus was a Roman unit used for long distances. It meant one thousand paces.
(2) Why is a centimetre convenient for measuring a line segment?
Answer: A line segment is generally a short length. Therefore, centimetre is a convenient unit for measuring it accurately.
(3) What happens when the thermometer bulb receives heat?
Answer: The volume of mercury or coloured alcohol increases. It expands and rises through the narrow capillary tube.
(4) How are the IMD’s daily temperature records used?
Answer: The India Meteorological Department uses daily temperature records from different locations to formulate weather forecasts.
Q.5 Thermometer-scale questions.
(1) Ten-degree difference divided into ten equal parts
Answer: Each small division represents 1°C.
10°C ÷ 10 = 1°C
(2) Six divisions above the 20°C mark
Answer: 26°C
20°C + (6 × 1°C) = 26°C
(3) Three divisions above the 40°C mark
Answer: 43°C
40°C + (3 × 1°C) = 43°C
(4) Why determine the value of each small division?
Answer: Laboratory thermometers have different ranges and scales. Knowing the value of each small division is necessary for recording a precise and accurate temperature.
Q.6 Give scientific reasons.
(1) Special instruments are used in machinery-producing factories.
Answer: Machine parts must match and fit together perfectly. Their length and thickness must therefore be measured accurately to a range much smaller than one millimetre.
(2) Different measuring tapes are used for different occupations.
Answer: Cloth merchants, carpenters and surveyors measure different objects and distances. Measuring tapes have convenient markings according to these different requirements.
(3) Infrared thermometers were useful during COVID-19.
Answer: They could measure a person’s body temperature instantly from a distance without physical contact. This allowed many people to be checked quickly in crowded places.
Q.7 Apply your knowledge.
(1) Measuring a shirt and a small machine component
Answer: The same instrument should not be used for both.
A tailor should use a flexible measuring tape to measure the shirt. The factory worker should use a screw gauge or Vernier caliper because the machine component requires a much more precise measurement.
(2) Thermometer hanging on a wall
Answer: It will show the temperature of the surrounding air. A wall thermometer measures the air temperature inside the room.