Physical Science

Correct Answer: C

The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect: Methane (CH4). Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: A

The major ingredient of leather is Collagen. This description follows from the defining characteristics and established facts associated with the subject.

Correct Answer: A

The metal that is used as a catalyst in the hydrogenation of oils is Ni. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: A

The most abundant element in sea water is Chlorine. Its geographic position or physical characteristics account for the description given.

Correct Answer: A

The most abundant element in the Earth’s crust is Oxygen. Astronomical observations and measurements establish this relationship among the relevant celestial bodies.

Correct Answer: B

The most abundant element in the universe is Hydrogen. Astronomical observations and measurements establish this relationship among the relevant celestial bodies.

Correct Answer: A

The most suitable thermometer for measuring boiling point of water is Mercury Thermometer. This value follows from the standard definition or accepted conversion used for the quantity.

Correct Answer: B

The only non metal exists in liquid state is Bromine. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: B

The position of an element in the Periodic Table is determined by its Proton number. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: B

The property by virtue of which metals can be beaten into thin sheets is known as: Malleability. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: D

The reaction between methane and chlorine in diffused sunlight is Radical substitution. Astronomical observations and measurements establish this relationship among the relevant celestial bodies.

Correct Answer: A

The second most abundant metal found in the earth’s crust is Silicon. Astronomical observations and measurements establish this relationship among the relevant celestial bodies.

Correct Answer: A

The three elements needed for healthy growth of plants are N, P, K. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: A

The toxicity of which of the following heavy metals leads to Liver cirrhosis: Copper. This follows from the structure and normal physiological function of the relevant organ, tissue, or body system.

Correct Answer: B

The two elements that are frequently used for making transistors are Silicon and Germanium. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: C

The yellow colour in photochemical smog is due to the presence of Nitrogen dioxide. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: D

There is no connection of supernova explosion with Quasars. This description follows from the defining characteristics and established facts associated with the subject.

Correct Answer: B

Water is a universal solvent for what reactions: Biochemical. This description follows from the defining characteristics and established facts associated with the subject.

Correct Answer: D

Considered the building blocks of matter are Atoms. This description follows from the defining characteristics and established facts associated with the subject.

Correct Answer: A

The three subatomic particles of an atom are Protons, Neutr ons & Electrons. This description follows from the defining characteristics and established facts associated with the subject.