[1 Mark Question Answer]

Question 11 Mark

Which gas is chiefly responsible for global warming?

Answer

Carbon dioxide gas is chiefly responsible for global warming.

Question 21 Mark

What is greenhouse effect?

Answer

The process by which absorption and emission of infra-red radiation by the atmospheric gases warm up the surface of a planet and its lower atmosphere is called green-house effect.

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Question 31 Mark

A deep pond of water has its top layer frozen. What will be the likely temperature of water layer
1. just in contact with ice
2. at the bottom of pond?

Answer

1. Temperature of water layer just in contact with ice is $0^{\circ} C$.
2. At the bottom of pond is $4^{\circ} C$.

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Question 41 Mark

At what temperature the pure water has (a) maximum density (b) minimum volume?

Answer

At $4^{\circ} C$, pure water has maximum density and minimum volume.

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Question 51 Mark

Explain why do vegetables and fruits get damaged during severe frost?

Answer

Vegetables and fruits get damaged during severe fruits because the water present in them on freezing expands and burst open the cell walls of cells.

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Question 61 Mark

A body radiates out 300 calories of heat energy. How much heat energy is radiated out by the body in joules?

Answer

Heat energy radiated by the body $= Q =300 Cal$
As $1 cal =4.2 J$
$
\begin{array}{l}
Q=300 Cal=300 \times 4.2 J \\
Q=1260 J
\end{array}
$

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