General Science Test 4

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1. Why is a metal rim heated before fitting it to the wheel ?

Because the force of adhesion between a hot metal rim and wood is stronger.

Because, in this way, the metal rim has a firm grip on the wheel.

Because it removes the kinks in the metal rim.

Because it strengthens the metal rim.

2. Which of the two will be warmer, single thick blanket or two thin blankets (one placed over the other) ?

Both will be equally warm.

Nothing can be said.

Two blankets, one placed over the other.-

Single blanket.

3. Why water boils below IOOT at higher altitudes ?

Because atmospheric temperature is. more at higher altitudes.

Because atmospheric temperature is less at higher altitudes.

Because atmospheric pressure is le~3s at higher altitudes.

Because atmospheric pressure is,more at higher altitudes.

4. Why water gets cooled in an earthen pitcher ?

Recause of none of these.

Because water percolates through pores of the pitcher and evaporates. Evaporation causes cooling.

Because pitcher absorbs heat of the water.,

Because pitcher does not allow heat to enter but it allows heat to leave the water.

5. Why thick glass tumblers crack when very hot liquids are poured in them ?

Because thick glass tumblers are of a poor quality.

Because thick glass tumblers cannot withstand high temperatures.

Because of unequal expansion of inner and outer layers of tumbler.

Because thick glass tumblers cannot withstand sudden expansion.

6. Which formula is used to convert Centigrade into Fahernheit scale ?

C x 5/9 - 32.

C x 5/9 + 32.

C x 9/5 - 32.

C x 9/5 + 32.

7. Why does a big fire in the open appear to be fanned by strong winds ?

Because there is a continuous expansion of the air suff ounding the fire.

Because fire repels carbon dioxide of the atmosphere.

Because fire attracts oxygen of the air.

Because the air a~ove the flames becomes hot and rises up. The air surrounding the fire rushes to fill that vacuum. Thus, ars that the fire is fanned by strong winds.

8. Why mountains are cooler than plains ?

Because mountains absorb more heat.

Because mountains do not absorb any heat.

Because there is plenty of rainfall in the mountains.

Because air on mountains is less dense and, therefore, it absorbs much less heat from the rays of the sun.

9. When salt Is sprinkled on ice, ice does not readily melt. Why ?

Because salt lowers the temperature of ice.

The melting point of this compound is higher than that of ice.

Because salt acts as a preservative for ice.

Because salt reacts with ice and a compound is formed.

10. Which of the following statements is true about Cryogenics ?

Cryogenics is a branch of science which deals with genes.

It is a painful brain turnour.

It is a disease of the throat caused by excessive crying.

Cryogenics is a branch of science which deals with the production of ‘very low’ temperatures.

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