a. Reflection.

b. Refraction.

c. Total internal reflection.

d. Rectilinear propagation of light.

a. milk production.

b. her own health.

c. both of these.

d. none of these. .

a. Transformation of mechanical energy spent in compressing the air particles against the pressure of air inside.

b. Transformation of mechanical energy spent in overcoming friction.

c. Both of these.

d. None of these.

a. the7e is more catabolism.

b. it helps in quick recovery.

c. both of these.

d. digestion is improved.

a. diet surveys of normal healthy people.

b. chemical assay.

c. ralcrobiological assay.

d. methods involving laboratory animals.

a. Because the free surface of water tends to contract.

b. Because the cohesive force between the molecules of water more in air than in water.

c. Because the water glues the hair together.

d. Because the adhesive force between the molecules of water and the molecules of hair is very strong.

a. equal amount of energy and protein.

b. less energy, more protein.

c. more energy.

d. more protein.

a. The rotatory motion of the wheels of the vehicle contributes to this increase in pressure.

b. When the vehicle is in motion, the molecules of the air in the tyres acquire more kinetic energy. This increase in kinetic energy is responsible for the increase in pressure.

c. Because the tyres suffer a slight contraction when they are in motion.

d. The temperature increases, air in the tyres expands. . Therefore, there is a slight increase in the pressure of air.

a. Because steam contains a greater amount of heat.

b. Because the temperature of steam is more than that ~off bboiling water.

c. Both of these.

d. None of these.

a. Taking heights and weights and comparing these with normal heights and weights meant for that particular age.

b. Any clinical symptoms.

c. Anthropometric measurements.

d. All of these.