General Science Questions and Answers Part-5

1. Monazite is an ore of
a) Titanium
b) Zirconium
c) Iron
d) Thorium

Answer: d
Explanation: Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits.

2. Carbon, diamond and graphite are together called:
a) Allotrope
b) Isomers
c) Isomorphs
d) Isotopes

Answer: a
Explanation: Carbon, diamond and graphite are together called Allotrope

3. Potassium nitrate is used in
a) Medicine
b) Fertilizer
c) Salt
d) Glass

Answer: b
Explanation: Used in solid propellants, explosives, fertilizers. Potassium nitrate is the inorganic nitrate salt of potassium. It has a role as a fertilizer.

4. Permanent hardness of water may be removed by the addition of:
a) Sodium Carbonate
b) Alum
c) Potassium Permanganate
d) Lime

Answer: a
Explanation: Temporary hardness can be removed by boiling or by addition of Ca(OH)2. Permanent hardness can be removed by the addition of washing soda commonly known as sodium carbonate.

5. Soda water contains
a) Carbonic acid
b) Sulphuric acid
c) Carbon dioxide
d) Nitrous acid

Answer: a
Explanation: Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. It is carbonic acid. This produces a bubbly drink that's also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.

6. Which of the following is used in pencils?
a) Graphite
b) Silicon
c) Charcoal
d) Phosphorous

Answer: a
Explanation: Graphite is used in pencils

7. Which of the following metals forms an amalgam with other metals?
a) Tin
b) Mercury
c) Lead
d) zinc

Answer: b
Explanation: Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum.

8.Chemical formula for water is
a) NaAlO2
b) H2O
c) Al2O3
d) CaSiO3

Answer: b
Explanation: Chemical formula for water is H2O.

9. The gas usually filled in the electric bulb is
a) Nitrogen
b) Hydrogen
c) Carbon dioxide
d) Oxygen

Answer: a
Explanation: Incandescent light bulbs are filled with an inert gas like nitrogen, argon, or krypton - so that the filament doesn't catch fire. Early ones were a vacuum.

10.Washing soda is the common name for
a) Sodium Carbonate
b) Calcium Bicarbonate
c) Sodium Bicarbonate
d) Calcium Carbonate

Answer: a
Explanation: Sodium carbonate decahydrate, also known as washing soda, is the most common hydrate of sodium carbonate containing 10 molecules of water of crystallization.