A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to____________?

A. Prop him up if he falls
B. Spread out his weight and reduce the pressure on the rope
C. Add extra weight to keep the rope tightly stretched
D. To keep the centre of gravity always vertically above the rope

During a total solar eclipse there is most likely to be_____________?

A. A decrease in the rate of photosynthesis
B. An increase in the rate of photosynthesis
C. A decrease in the rate of respiration
D. No effect on either photosynthesis or respiration

Heating element of an electric heater is made up of___________?

A. Tungsten
B. Graphite
C. Chromium
D. Nichrome

In an oil lamp, the oil rises up in the wick due to?

A. Capillary action
B. Atmospheric pressure
C. Viscosity of oil
D. Change in temperature

Why are soft drink made with chilled water rather than water at room temperature?

A. Ingredients dissolve better in chilled water
B. Chilled water enhances the taste
C. Chilled water attracts more carbon dioxide
D. Chilled water is more hygienic

Coke is made by heating coal in the absence of air at__________?

A. 700 °c
B. 900 °c
C. 1300 °c
D. 1700 °c

As the temperature of ice rises, the ice melts and its density?

A. Decreases
B. Remain constant
C. Increases
D. Increases upto 10c

Nitrogen occurs in plant and animals in the form of ___________?

A. Minerals
B. Fats
C. Carbohydrates
D. Proteins

Air contains volume of carbon dioxide approximately?

A. 3%
B. 33%
C. 0.3%
D. 0.03%

The gases which are used by drivers as an artificial atmosphere are helium and_____________?

A. Nitrogen
B. Oxygen
C. Neon
D. Carbon monoxide