Physics MCQs for Class 9 with Answers Chapter 7

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Physics MCQs for Class 9 with Answers


Latent heat of vaporization is denoted by:
H1
Hm
Hv
Hf

The Celsius lower reference point is 0oC while upper reference point is:
212 oC
180oC
100oC
110oC

Expansion in one meter steel is:
1.0 mm
0.1 mm
1.0 mm
1.3 mm

Water freezes at .
0o F
32 oF
-273 K
0 K

Water freezes at
0oF
32oF
273 K
0 K

Evaporation takes place at temperature :
100°C only
0°C only
35°C Only
At all temperature

There are types of thermometer:
1
2
3
4

In ___________ (CFC) was found reacting with ozone.
1920s
1970s
1950s
1960s

Evaporation causes:
Melting
Boiling
Freezing
Cooling

If the mass of a body is ‘m’ and change in its temperature isΔT, then the heat absorbed or released is given by
ΔQ = cmΔT
ΔQ = mΔT
ΔQ = 2cΔT
ΔQ = cmΔT2

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