Excessive exposure of human to UV-rays results in
(i) damage to immune system, (ii) damage to lungs
(iii) skin cancer, (iv) peptic ulcers

Give definition: (i) closed system (ii) adiabatic system (iii) open system (iv) isolated system.

A small rise in the body terperature of humans is correctly by : (i) Sweating (ii) Dilating the skin arteries (iii) Constricted the skin arteries (iv) Inreased tension of muscles in the skin

A small rise in the body terperature of humans is correctly by : (i) Sweating (ii) Dilating the skin arteries (iii) Constricted the skin arteries (iv) Inreased tension of muscles in the skin

Food items on exposure to atmosphere become rancid due to the process of : (i) oxidation (ii) reduction (iii) corrosion (iv) hydrogenation

Give one use of each of the following: (i) Infrared rays (ii) Gamma rays (iii) microwaves (iv) Ultraviolet rays.

A small rise in the body temperature of humans is corrected by i) sweating ii) dilating the skin arteries iii) constructing the skin arteries vi) Increased tension of muscles in the skin,