Practice MCQ Questions and answers on General Science-GK

1

The tree which sends down roots from its branches to the soil is known as:

A) Oak B) Pine C) Banyan D) Palm

Discuss

Answer & Solution

Answer: Option C

Solution:

The tree which sends down roots from its branches to the soil is known as banyan tree.

2

Electric bulb filament is made of

A) Copper B) Aluminum C) Lead D) Tungsten

Discuss

Answer & Solution

Answer: Option D

Solution:

Electric bulb filament is made of tungsten.

3

Brass gets discoloured in air because of the presence of which of the following gases in air?

A) Oxygen B) Hydrogen Sulphide C) Carbon dioxide D) Nitrogen

Discuss

Answer & Solution

Answer: Option B

Solution:

Brass gets discolored in air because of the presence of Hydrogen sulphide.

4

Which of the following is a non metal that remains liquid at room temperature?

A) Phosphorous B) Bromine C) Chlorine D) Helium

Discuss

Answer & Solution

Answer: Option B

Solution:

Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.

5

Chlorophyll is a naturally occurring chelate compound in which central metal is

A) Copper B) Magnesium C) Iron D) Calcium

Discuss

Answer & Solution

Answer: Option B

Solution:

One such chelate is chlorophyll, the green pigment of plants. In chlorophyll the central ion is magnesium, and the large organic molecule is a porphyrin. The porphyrin contains four nitrogen atoms that form bonds to magnesium in a square planar arrangement.

6

Which of the following is used in pencils?

A) Graphite B) Silicon C) Charcoal D) Phosphorous

Discuss

Answer & Solution

Answer: Option A

Solution:

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

Discuss

Answer & Solution

Answer: Option B

Solution:

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

8

Chemical formula for water is

A) NaA1O₂ B) H₂O C) Al₂O₃ D) CaSiO₃

Discuss

Answer & Solution

Answer: Option B

Solution:

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

Discuss

Answer & Solution

Answer: Option A

Solution:

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

Discuss

Answer & Solution

Answer: Option A

Solution:

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