Draw the scale of a thermometer in which the smallest
division reads 0.5 °C. You may draw only the portion
between 10 °C and 20 °C.
A laboratory thermometer has 50 divisions between 0 °C
and 100 °C. What does each division of this thermometer
measure?
A laboratory thermometer is not used to measure our body
temperature. Give a reason
Fill in the blanks:
(i) The hotness or coldness of a system is determined by its
.
(ii) The temperature of ice-cold water cannot be measured
by a thermometer.
(iii) The unit of temperature is degree .
37 °C is the same temperature as .
(i) 97.4 °F
(ii) 97.6 °F
(iii) 98.4 °F
(iv) 98.6 °F
1. The normal temperature of a healthy human being is
close to .
(i) 98.6 °C
(ii) 37.0 °C
(iii) 32.0 °C
(iv) 27.0 °C
You are provided with the following materials—vinegar,
honey, mustard oil, water, glucose and wheat flour.
Make any two pairs of materials where one material is
soluble in the other. Now, make two pairs of materials where
one material remains insoluble in the other material.
(i) Who am I? Identify me on the basis of the given
properties.
(a) I have lustre.
(b) I can be easily compressed.
(c) I am hard and soluble in water.
(d) You cannot see clearly through me.
(e) I have mass and volume but you
cannot see me.
(ii) Make your own ‘Who am I?’
Imagine you have two mysterious materials, X and Y. When
you try to press material X, it feels rigid and does not change
its shape easily. On the other hand, material Y easily changes
its shape when you press it. Now, when you mix both
materials in water, only material X dissolves completely while material Y remains unchanged. What can materials
X and Y be? Can you identify whether material X is hard or
soft? What about material Y? Justify your answer.
Air is all around us but does not hinder us from seeing each
other. Whereas, if a wooden door comes in between, we
cannot see each other. It is because air is
and the wooden door is . Choose the most
appropriate option:
(i) transparent, opaque
(ii) translucent, transparent
(iii) opaque, translucent
(iv) transparent, translucent
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