CBSE Science Class 7
Heat
Heat - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Define temperature.
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Ans:
A reliable measure of hotness of the hotness of an object is its temperature
Q2: Name the device used to measure temperature.
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Q3: Name the two types of thermometer.
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Ans:
Clinical thermometer and laboratory thermometer.
Q4: What do you mean by clinical thermometer?
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Ans:
Thermometer means to measure our body temperature is called clinical thermometer.
Q5: The bulb in thermometer contains _____________.
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Q6: Thermometer should be washed before and after use with, preferably with an _________ solution.
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Q7: Before use the mercury level of thermometer should be below_________________________.
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Q8: We should hold the thermometer by the bulb while holding it. True/False.
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Q9: What is the unit of temperature as adopted by India?
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Ans:
Degree Celsius (°c )
Q10: What is the average body temperature of a healthy person?
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Q11: What is the range of laboratory thermometer?
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Q12: Laboratory thermometer should be kept upright and not tilted. True/False.
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Q13: The bulb of laboratory thermometer should not touch the surface of the ________________.
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Q14: What is the use of kink in a clinical thermometer?
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Ans:
Kink prevents mercury level from falling on its own.
Q15: Give an example to show the transfer from heat from one body to another.
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Ans:
Any utensil kept on flame, becomes hot because heat transfers from flame to the utensil.
Q16: Heat always flows from a hotter object to ________________________.
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Q17: In solid heat is transferred by the process of
- Conduction
- convection
- Radiation
- None of these
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Q18: Give examples of conductors.
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Ans:
Aluminium, copper, iron etc.
Q19: Give examples of insulators.
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Q20: Insulators are ________ conductor of heat.
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Q21: Conductors are _____________ conductor of heat.
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Q22: Name the process by which heat transfer in air.
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Q23: From the sun the heat comes to us by the process called __________________.
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Q24: Transfer of heat by radiation requires any medium or not?
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Q25: All hot bodies __________________ heat.
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Q26: An iron rod at 30°c is dropped by chance into a bucket containing water at 30°c, the heat will flow or not in this case?
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Q27: An wooden spoon is dipped in a cup of ice-cream ,its other end
- Becomes clod by the process of convention
- Becomes hot by the process of conduction
- Does not become cold
- None of these.
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Ans:
Does not become cold
Q28: Which of the two absorbs more radiation- a dark coloured object or a light coloured object?
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Ans:
A dark coloured object.
Q29: Temperature of boiling water cannot be measured by a ________________________.
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Ans:
Clinical thermometer.
Q30: Land breeze blows at the time of ______________.
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Q31: Sea breeze blows at the time of ______________.
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Q32: Which type of cloth should be preferredin the month of June?
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Ans:
Light coloured clothes
Q33: Which type of cloth should be preferredin the month of January?
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Ans:
Dark coloured clothes.
Q34: A cold steel spoon is dipped into a cup of hot coffee, it will transfer heat to its other end or not? If yes then by which process?
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Q35: One litre of water at 30°c is mixed with one litre of water at 48°c, the temperature of the mixture will be.
- 48°c
- 30°c
- Between 30°c and 48°c
- More than 48°c
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Ans:
Between 30°c and 48°c
