a. Because the force of attraction between the molecules of ice and alcohol is greater than the force of attractioa between

b. Because the specific gravity of ice is less than that of water but more than that of alcohol.

c. Because water is more viscDus than alcohol.

d. Because of all of these reasons.

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.

a. Because repairs can be carried out conveniently.

b. It is done to allow for expansion because a lot of heat is produced on the rails.

c. It is done to reduce the force of friction between the wheels of the train and the railway line.

d. Because the small space acts as an outlet for air when the train is passing.

a. Because the surface of water behaves like a stretched membrane.

b. Because the gravitational pull on the needle is balanced by the upward thrust of water.

c. Because the needle is generally made of a magnetic substance and, therefore, its motion is guided by the earth's magnetic field.

d. Because the needle is in stable equilibrium.

a. greater than 8-2 km/sec.

b. greater than 9,2 km/sec.

c. greater than 10-2 km/sec.

d. greater than 1 P2 km/sec.

a. The mass of a body will become zero.

b. The mass of a body will become infinite.

c. The weight of a body will become zero.

d. The weight of a body will become infinite.

a. Eating a variety of foods.

b. Freedom from infection.

c. Eating lots of tonics.

d. None of t hese.

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. 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. Because visibility is better in winter than in'summer.

b. Because the moisture in the breath condenses, as it comes o of the mouth, during winter.

c. Because of both of these reasons.

d. Because of neither of these reasons.