Option “2” is correct. Electrolyte substance used in a car battery is Sulphuric acid (H_2 SO_4 ). It is a strong acid.
474. ‘Nobel Oil’ is the name of which one of the following explosives?
1. TNG
2. TNP
3. TNA
4. TNT
Option “1” is correct. Tri Nitro Glycerin (TNG) also known as Nobel Oil, is an explosive fluid.
475. Which of the following fossil fuels in the cleanest fuel?
1. Coal
2. Petrol
3. Natural gas
4. Diesel
Option “3” is correct. The use of natural gas in power generation provides a cleaner alternative to coal and other fossil fuels.
476. Which gas is mixed with Oxygen for respiration by divers in deep sea?
1. Helium
2. Nitrogen
3. Xenon
4. Ammonia
Option “1” is correct. Heliox is a breathing gas composed of a mixture of Helium (He) and Oxygen This is frequently used for respiration by divers in the deep sea.
477. The atomic nucleus was discovered by:
1. Rutherford
2. Dalton
3. Einstein
4. Thompson
Option “1” is correct. The nucleus is a very dense region consisting of protons and neutrons at the centre of an atom. It was discovered in 1911 as a result of Ernest Rutherford’s interpretation of the 1909 Geiger-Marsden gold foil experiment.
478. Which one of the following mixtures is homogeneous?
1. Starch and sugar
2. Methanol and water
3. Graphite and charcoal
4. Calcium carbonate and calcium bicarbonate
Option “2” is correct. A mixture of methanol (a liquid) and water (a liquid) is homogeneous.
479. Polymer of Natural Rubber is-
1. Ethylene
2. Isoprene
3. Acetylene
4. Hexane
Option “2” is correct. Polymerization is the process of joining together a large number of small molecules to make a number of the very large molecule. Natural rubber is the natural polymer of Isoprene.