Everyday Science

 Which one of the following mixture of gases is required in gas welding? 

(a) Oxygen and ethylene

(b) Oxygen and hydrogen

(c) Acetylene and oxygen

(d) All of the above

Pure gold is

(a) 17 carats

(b) 20 carats

(c) 24 carats

(d) 36 carats

Which of the following gases is used for the purification of water?

(a) Oxygen

(b) Ammonia

(c) Chlorine

(d) None of above

 Which of the following is a gas?

(a) Thorium

(b) Plutonium

(c) Mercury

(d) Chlorine

Which material is used for bleaching paper?

(a) Caustic soda

(b) Sodium

(c) Lime

(d) None of these

Soft drinks contain significant quantities of

(a) Caffeine

(b) Nicotine

(c) Tannin

(d) None of these

A transformer is used to

(a) Increase DC voltage

(b) Increase or decrease AC voltage

(c) Decrease DC voltage

(d) None of these

Brass is an alloy of

(a) Copper and Tin

(b) Copper and Zinz

(c) Copper and Nickel

(d) None of these

The most abundant element in Earth’s crust is?

(a) Silicon

(b) Oxygen

(c) Aluminum

(d) None of these

The penetration of X-rays through an object depends upon the objects

(a) Density

(b) Shape

(c) Pressure

(d) Size

When water boils, its temperature

(a) Begins to increase

(b) Begins to decrease

(c) Remains constant

(d) All of these

To find the hidden secrets under the water, the ships and submarines use the

(a) Radiation system

(b) Sonar system

(c) X-ray system

(d) Radiation system