Elements And Metals(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1.

Chemical formula for water is

NaAlO2
H2O
Al2O3
CaSiO3

Explanation:-

Answer: Option B. -> H2O

Question 2.

Which of the following is an element?

Ruby
Sapphire
Emerald
Diamond

Explanation:-

Answer: Option D. -> Diamond

Question 3.

Potassium Permanganate is used for purifying drinking water, because

it is a sterilising agent
it dissolves the impurities of water
it is a reducing agent
it is an oxidising agent

Explanation:-

Answer: Option D. -> it is an oxidising agent

Question 4.

Which of the following metals remain in liquid for under normal conditions?

Radium
Zinc
Uranium
Mercury

Explanation:-

Answer: Option D. -> Mercury

Question 5.

Which of the following is the lightest metal?

Mercury
Lithium
Lead
Silver

Explanation:-

Answer: Option B. -> Lithium

Question 6.

Amalgams are

highly coloured alloys
alloys which contain mercury as one of the contents
alloys which have great resistance to abrasion
alloys which contain carbon

Explanation:-

Answer: Option B. -> alloys which contain mercury as one of the contents

Question 7.

Bell metal is an alloy of

nickel and copper
zinc and copper
brass and nickel
tin and copper

Explanation:-

Answer: Option D. -> tin and copper

Question 8.

The main constituents of pearls are

calcium oxide and ammonium chloride
calcium carbonate and magnesium carbonate
aragonite and conchiolin
ammonium sulphate and sodium carbonate

Explanation:-

Answer: Option B. -> calcium carbonate and magnesium carbonate

Question 9.

Water is a good solvent of ionic salts because

it has a high specific heat
it has no colour
it has a high dipole moment
it has a high boiling point

Explanation:-

Answer: Option C. -> it has a high dipole moment

Question 10.

Which of the following is not an isotope of hydrogen?

Tritium
Deuterium
Protium
Yttrium

Explanation:-

Answer: Option D. -> Yttrium

http://en.wikipedia.org/wiki/Isotopes_of_hydrogen