Question
What type of clothes should we wear in summer? Why?

Answer

We should wear cotton clothes in hot summer days because we perspire more through the pores of the skin during such days. Since, sweat is mainly water and cotton clothes are good absorber of water, they absorb the sweat quickly and expose it to the atmosphere for evaporation. The evaporation of sweat from the cotton clothes takes the latent heat of vaporization from our skin hence the skin loses heat and makes us feel cool and comfortable.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A body of mass $2kg$ is thrown vertically upwards with an initial velocity of $20m/s$. What will be its potential energy at the end of $2s$? (Assume $g = 10m/s^2$).
Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take same time to reach the surface of earth. Justify your answer.
A ball thrown up vertically returns to the thrower after $6s$. Find its position after $4s$.
The velocity of a body in motion is recorded every second as shown-
time $(s)$ $0$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
velocity $(m/s)$ $60$ $54$ $48$ $42$ $36$ $30$ $24$ $18$ $12$ $6$  
Calculate the
$a.$ acceleration
$b.$ distance travelled and draw the graph.
A bus starting from rest moves with a uniform acceleration of $0.1 m s ^{-2}$ for 2 minutes. Find:
a. the speed acquired.
b. the distance travelled.
What is prokaryotic cell? Differentiate between prokaryotic cell & eukaryotic cell?
A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the filter paper was removed when the water moved near the top of the filter paper.

  1. What would you expect to see, if the ink contains three different coloured components?
  2. Name the technique used by the child.
  3. Suggest one more application of this technique.
Name three occupational diseases caused due to air pollution. Also mention their causative factors.
Why does the temperature of a substance remain constant during its melting point or boiling point?
If a sprinter runs a distance of $100$ metres in $9.83$ seconds, calculate his average speed in $km/h.$