We see green coloured plastic grass at many places these
days. Space around natural grass feels cooler than space
around the plastic grass. Can you find out why?
Identify in which of the given processes, evaporation is very
important—
(i) Colouring with
(a) crayons (b) water colours
(c) acrylic colours (d) pencil colours
(ii) Writing on paper with
(a) pencil (b) ink pen (c) ball point pen
Which of the following best describes condensation?
(i) The conversion of water into its vapour state.
(ii) The process of water changing from a liquid into
gaseous state.
(iii) The formation of clouds from tiny water droplets.
(iv) The conversion of water vapour into its liquid state.
Someone tells you that she has a fever of 101 degrees. Does
she mean it on the Celsius scale or Fahrenheit scale?
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
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