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Explanation

Sunlight travels at the speed of light.

Sunlight an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.

Light from Sun travels a distance of  150 Million km before it reaches Earth

Moonlight an average of 1.3 seconds to travel from the moon to the Earth.

ND16-3-2023

Explanation

A hexagon is a polygon with 6 sides.

It has 6 angles, one at each vertex.

It also has 6 vertices.

Explanation

Sodium is a chemical element with the symbol Na and atomic number 11.

It is a soft, silvery-white, highly reactive metal.

Sodium is an alkali metal, being in group 1 of the periodic table.

Explanation

"The petrol boat picked up signals of a ship in distress."

• "Distress" is a noun that refers to a state of danger or emergency.

• "Distressed" is an adjective, but it doesn’t fit the grammatical structure of the sentence.

• "Distressing" is a present participle/adjective that refers to something causing distress, but here we need the noun "distress".

Explanation

"As it was a minor offence, the traffic policeman let him off with a warning."

• "Offence" (noun) means a violation or a wrongdoing, especially of a law or rule.

• The sentence is talking about a small violation, so "minor offence" is the correct phrase.

Explanation

"I laughed at him for making a silly mistake."

• "Laughed at" is the correct phrase used when you are mocking 

• "For" is used to explain the reason for the action (in this case, making a silly mistake).

Explanation

• On Earth, surface water covers 70% area.
• 70-71 percent of the Earth's surface is water-covered.
• The oceans hold about 96.5 percent of all Earth's water.
• ***
• This includes oceans, rivers, lakes, glaciers, and groundwater.
  

Explanation

"Wise people do not spend their money foolishly."

• "Wise" is an adjective describing people.

• We use adjectives before nouns (e.g., wise people).

• "Wisely" is an adverb, and "wisdom" is a noun — both do not fit here.

Explanation

"The gift was bought for her."

"For" is used to indicate the recipient of the gift or action.

The gift was bought from her.

The correct preposition is "from" when indicating the source or seller.

So, the sentence becomes: "The gift was bought from her."

The gift was bought by her.

The correct preposition is "by" when indicating the agent performing an action (who bought the gift).

So, the sentence becomes: "The gift was bought by her."

Explanation

Photosynthesis occurs most efficiently in this temperature range, as enzymes involved in the process function optimally.

Temperatures above 35°C can inhibit enzyme activity, reducing the rate of photosynthesis.