Page 38 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

7. The dark-coloured clothes .................. heat and make us feel warm and comfortable

in winters.
Ans. absorb

C. State whether the following statements are true (T) or false (F).
1. A laboratory thermometer should be kept upright and not tilted.

2. We should hold the thermometer by the bulb while reading the temperature on it.
3. Alcohol cannot be used to measure high temperatures.

4. A thermometer has three main parts.
5. Windows in homes located in coastal areas face the sea.

6. A clinical thermometer is used for measuring human or animal body temperature.
7. Mercury is solid at room temperature.

Ans. 1. (T) 2. (F) 3. (T) 4. (T) 5. (T) 6. (T) 7. (F)
D. Match the following.

Column A Column B
1. Land breeze blows during (a) Summers

2. Sea breeze blows during (b) Winters
3. Dark-coloured clothes are preferred during (c) Day

4. Light-coloured clothes are preferred during (d) Night
Ans. 1. (d) 2. (c) 3. (b) 4. (a)

E. Very short-answer questions

1. Which scales are commonly used to measure temperature?
Ans. Celsius scale, Fahrenheit scale and Kelvin scale are commonly used to measure

temperature.
2. Name the different modes of transfer of heat.

Ans. The different modes of transfer of heat are :

• Conduction • Convection • Radiation
3. Give two examples each of hot and cold objects.

Ans. Examples of hot objects : A frying pan placed over a burning stove, a bucket full of

hot water.
Examples of cold objects: A water bottle kept inside a refrigerator, a bucket full of

ice.

4. What is the body temperature of a healthy human being?
Ans. The body temperature of a healthy human being is 37°C or 98.6°F.

5. Give one example each of a good conductor and a bad conductor of heat.
Ans. Copper metal is a good conductor of heat and wood is a bad conductor of heat.

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