Question
Why are athletes advised to put on extra clothes after competing on event?
✓
Answer
Athletes perspire profusely after competing in an event. The latent heat of evaporation of the ‘sweat’ is withdrawn from the body itself and therefore, cools the body. Hence, if they do not put on extra clothes, they are likely to catch cold.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
(a) Name the radioactive radiations which have the least penetrating power.
(b) Give one use of radio isotopes.
(c) What is meant by background radiation?
(b) Give one use of radio isotopes.
(c) What is meant by background radiation?
(a) What do you understand by the term electromagnet?
(b) You have been provided with a solenoid AB .
(i) What is the polarity at the end A?
(ii) Give one advantage of an electromagnet over a permanent magnet.
(b) You have been provided with a solenoid AB .
(i) What is the polarity at the end A?
(ii) Give one advantage of an electromagnet over a permanent magnet.
Show by a diagram the refraction of two incident rays parallel to the principle axis passing through a convex lens by treating it as a combination of a glass block and two triangular glass prisms.
Find the cost of operating an electric toaster for two hours if it draws 8 A current on a 110 volt circuit. The cost of electrical energy is 2.50 per kWh .
What is the noise? Give an example.
Draw a labelled diagram of a d.c. motor.
State one way to obtain greater moment of a given force about a given axis of rotation.
What determines the pitch of a sound?
A man standing $25 \ m$ away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of the sound in air is $350 m s ^{-1}$. (b) will the man be able to hear a distinct echo? Explain the answer.
→