10 COMMON QUESTION

Question 1

Neutrons were discovered by?

  Faraday

  J.J. Thomson

  Chadwick

  Dalton

It's 'Chadwick '
Sir James Chadwick was an English physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932.

Question 2

Which of the following is used in preparation of dynamite?

  glycerol

  ethyl alcohol

  methyl alcohol

  glycol

It's 'glycerol '
Dynamite is an explosive material based on nitroglycerin, using diatomaceous earth or another adsorbent substance such as powdered shells or clay

Question 3

An alloy used in making heating elements for electric heating devices is _____?

  solder

  alloy steel

  nichrome

  German silver

It's 'nichrome '
Nichrome generally refers to any alloy of nickel, chromium, and often iron and other elements or substances. Nichrome alloys are typically used in resistance wire.

Question 4

Oxygen and ozone are _______.

  Allotropes

  Isomers

  Isotopes

  Isobars

It's 'Allotropes '
Allotropy is a behavior exhibited by certain chemical elements that can exist in two or more different forms, known as allotropes of that element. In each allotrope, the element's atoms are bonded together in a different manner. Thus, allotropes are different structural modifications of an element.

Question 5

Which hydrocarbon is mainly present in gobar gas?

  Butane

  Propane

  Methane

  Ethane

It's 'Methane '
Bio gas is produced from cattle dung in a bio gas plant commonly known as gobar gas plant through a process called digestion.

Question 6

A radioactive substance emits______?

  alpha particle

  beta particle

  gamma particle

  all of the three

It's 'all of the three '
Radioactive substances are continually producing three kinds of dangerous radiation, alpha particles, beta particles and gamma rays. These types of radiation are invisible to the naked eye and so you won't see a green glow.

Question 7

Which one among the following polymers is used for making bullet-proof material?

  Polyvinyl chloride

  Polystyrene

  Polyethylene

  Polyamide

It's 'Polyethylene '
A bullet-proof material is made of polyethylene. It is a higher grade of the plastic found in Tupperware.

Question 8

Hydrogen bomb is based on the principle of_______?

  nuclear fission

  nuclear fusion

  natural radioactivity

  artificial radioactivity

It's 'nuclear fusion '
Hydrogen bomb derives a large portion of its energy from the nuclear fusion of hydrogen isotopes.

Question 9

Which of the following is the lightest metal?

  Mercury

  Silver

  Lithium

  Lead

It's 'Lithium '
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.

Question 10

The inert gas abundantly found in widely distributed is_____?

  Xe

  Kr

  He

  Ar

It's 'Ar '
Argon (Ar) is the most prevalent of the noble gases in Earth's crust with the element composing 0.00015% of this crust.