Which of the following can cause depletion of Ozone layer ?

• Hydrogen Sulphide
• Smoke
• Aerosols
• Hydrogen gas
Solution
Correct Option: C  [ Aerosols ]

Explanation:

Which is the correct order to show units from largest to smallest ?

• Millilitres, decilitre, lite
• Litre, decilitre, millilitre
• Decilitre, millilitre, litre
• Litre, millilitre, decilitre
Solution
Correct Option: B  [ Litre, decilitre, millilitre ]

Explanation:

Consider the following statements:

(i) Optical fibre communication is based on the principle of refraction of light.

(ii) Optical fibre communication is based on the principle of total internal reflection of light.

(iii) In optical fibre communication, light is the carrier wave.

(iv) Optical fibre permits communication over short distances only.

Select the correct statement(s) using the codes given below.

• Only (i) and (ii)
• Only (ii)
• Only (ii) and (iii)
• Only (iii) and (iv)
Solution
Correct Option: C  [ Only (ii) and (iii) ]

Explanation:

What is the meaning of the word 'Tsunami' in Japanese?

• High waves
• Destructive waves
• Harbour waves
• none of these
Solution
Correct Option: C  [ Harbour wave ]

Explanation: Indian Ocean Tsunami occurred on 26 December, 2004 with an epicentre off the west coast of Sumatra, Indonesia.

The layer of the atmosphere in which Radio Waves are reflected back is called:

• Exosphere
• Ionosphere
• Troposphere
• Stratosphere
Solution
Correct Option: B  [ Ionosphere ]

Explanation:

What is the scientific name of vitamin A

• Retinol
• Riboflavin
• Ascorbic acid
• Calciferol
Solution
Correct Option: A  [ Retinol ]

Explanation: Vitamin A is a fat-soluble vitamin that is essential for various biological processes, including vision, immune system function, and skin health.

The red planet is

• Venus
• Saturn
• Mars
• Neptune
Solution
Correct Option: C  [ Mars ]

Explanation:

Blood Circulation was discovered by?

• Mary Anderson
• William Harvey
• Virginia Apgar
• Robert Feulgen
Solution
Correct Option: B  [ William Harvey ]

Explanation: William Harvey an English physician discovered the principle of the circulation of the blood through the body.

Oxidation is a process which involves

• addition of Oxygen.
• addition of Hydrogen.
• removal of Oxygen.
• addition of Nitrogen.
Solution
Correct Option: A  [ addition of Oxygen. ]

Explanation: the term "oxidation" is defined as the addition of oxygen/electronegative element to a substance or removal of hydrogen/electropositive element from a substance.

Sound waves in air are

• Transverse
• Longitudinal
• Electromagnetic
• Polarized
Solution
Correct Option: B  [ Longitudinal ]

Explanation: