CHAPTER 2
Practice Set 4
Measurement
Grade 6 Science • Maharashtra State Board • 30 Marks
Q.1 (A) Choose the correct option.
4 Marks
(1) Two children obtain different distances after measuring fifteen steps mainly because __________.
(2) The uniform system of measuring instruments and units is called the __________.
(3) Which symbol represents Fahrenheit?
(4) Which liquid may be present in the bulb of a laboratory thermometer?
Q.1 (B) State whether true or false. Correct the false statement.
4 Marks
(1) One centimetre is equal to one hundred millimetres.
(2) The zero mark of a ruler should align with the beginning edge of an object.
(3) A digital body thermometer generally measures temperatures from 0°C to 110°C.
(4) The symbol of Kelvin is K.
Q.2 Complete the measurement table.
4 Marks
| Measurement | Unit | Symbol |
|---|---|---|
| Length or distance | ________________ | m |
| Mass | Kilogram | ________________ |
| Time | ________________ | s |
| Temperature in scientific research | Kelvin | ________________ |
Q.3 Complete the concept map of a laboratory thermometer.
4 Marks
Lower End
↓
Small part:
Liquid Inside
↓
Mercury or
Narrow Inner Passage
↓
tube
Common Scale
↓
scale
Q.4 Answer in one or two sentences.
4 Marks
(1) What problems arose when different regions used different measuring instruments and units?
(2) How does the first fixed pole act as a reference point while marking a Kho-Kho field?
(3) Why are milestones considered reference points while travelling?
(4) Why is a digital temperature display easier to read than the liquid level and markings of an older clinical thermometer?
Q.5 Answer the following in detail.
5 Marks
(1) Explain the importance of a reference point while measuring distance.
(2) Describe the main parts and working of a laboratory thermometer.
(3) State any two correct precautions for using a laboratory thermometer.
Q.6 Read the situations and answer.
5 Marks
A shopkeeper measures one metre of cloth using a metre scale. The same cloth is measured again at home using another correct metre scale.
(1) Should both measurements be the same or different?
(2) Which type of measurement is used?
(3) Why is this method reliable?
A student stands in an open ground holding a thermometer without placing its bulb against any particular object.
(4) Which temperature will the thermometer show?
(5) What should the student do to measure the temperature of a leaf?
Q.7 Give scientific reasons.
4 Marks
(1) A reference point is necessary while marking a sports field.
(2) A digital thermometer is convenient for many users.
(3) The bulb of a thermometer must touch the substance whose temperature is measured.
(4) Standard units are important in trade and daily activities.
CHAPTER 2
Practice Set 4 – Solutions
Measurement
Q.1 (A) Choose the correct option.
(1) Reason for different fifteen-step measurements
Answer: (a) Their steps are of different lengths
(2) Uniform system of measurement
Answer: (b) International System of Units
(3) Symbol of Fahrenheit
Answer: (c) °F
(4) Liquid in a laboratory thermometer
Answer: (b) Mercury or coloured alcohol
Q.1 (B) True or false. Correct the false statement.
(1) One centimetre equals one hundred millimetres.
False.
One centimetre is equal to ten millimetres.
(2) The zero mark should align with the beginning edge.
True.
(3) A digital body thermometer measures from 0°C to 110°C.
False.
A digital body thermometer generally measures temperatures from 35°C to 42°C.
(4) The symbol of Kelvin is K.
True.
Q.2 Complete the measurement table.
| Measurement | Unit | Symbol |
|---|---|---|
| Length or distance | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | s |
| Temperature in scientific research | Kelvin | K |
Q.3 Laboratory thermometer concept map.
Lower End
↓
Small bulb
Liquid Inside
↓
Mercury or coloured alcohol
Narrow Inner Passage
↓
Capillary tube
Common Scale
↓
Celsius scale
Q.4 Answer in one or two sentences.
(1) Problems caused by different regional instruments and units
Answer: Different regions obtained measurements using different instruments and units. This caused significant difficulties in trade and other daily tasks.
(2) First fixed pole as a Kho-Kho reference point
Answer: The required fixed distance is measured from the first pole. Therefore, the first pole acts as the reference point for locating the second pole.
(3) Milestones as reference points
Answer: Milestones are fixed objects that indicate the distance to the next town from a specific location. They provide a fixed basis for expressing distance.
(4) Convenience of a digital display
Answer: A digital thermometer shows the temperature directly as a number. The user does not need to judge the level of mercury against small markings.
Q.5 Answer the following in detail.
(1) Importance of a reference point
Answer: Whenever distance is measured, it must begin from a fixed object or specific point. This fixed point is called a reference point. It gives everyone the same starting position and helps mark or compare distances correctly.
(2) Parts and working of a laboratory thermometer
Answer: A laboratory thermometer has a long, narrow, hollow glass tube with one end sealed. A small bulb at its lower end contains mercury or coloured alcohol. A fine capillary tube extends from the bulb through the glass tube.
When the bulb receives heat, the liquid expands and rises through the capillary tube. The temperature is recorded from the mark where the liquid level becomes stable.
(3) Any two precautions for using a laboratory thermometer
Answer:
- Keep the thermometer straight and vertical.
- Do not allow its bulb to touch the bottom or sides of the container.
- Read the stabilized liquid level at eye level.
Q.6 Read the situations and answer.
(1–3) One metre of cloth measured using two correct metre scales
Answer: Both measurements should be the same. This is standard measurement because both people use the same fixed unit—a metre. It is reliable because a standard unit does not change from person to person.
(4) Thermometer held in an open ground
Answer: It will show the temperature of the surrounding air.
(5) Measuring the temperature of a leaf
Answer: The bulb of the thermometer should be placed in contact with the leaf. The thermometer should be held correctly until the liquid level stabilizes.
Q.7 Give scientific reasons.
(1) A reference point is necessary while marking a sports field.
Answer: A sports field has fixed length and breadth. A reference point provides a definite starting position from which its boundaries and required distances can be measured correctly.
(2) A digital thermometer is convenient for many users.
Answer: It displays temperature directly as a digital number. Therefore, users do not have to observe a thin liquid level against small scale markings.
(3) The thermometer bulb must touch the substance.
Answer: The bulb receives heat from the substance being measured. Direct contact is necessary for the liquid inside to respond and show that substance’s temperature accurately.
(4) Standard units are important in trade and daily activities.
Answer: Standard units are fixed and uniform for everyone. They prevent differences and confusion in measurements used for trade and daily work.