Explanation

• Sunlight travels at the speed of light (~3 × 10⁸ m/s).
• Takes 8 minutes 20 seconds on average to reach Earth.
• Sunlight takes approximately 499 seconds to travel from the Sun to Earth.
• Distance traveled: 150 million km from Sun to Earth.
• Moonlight takes only 1.3 seconds to reach Earth.

Last verified on 13-03-2026

Explanation

• Comets: huge masses of snow and rocks that revolve around the Sun in orbits.
• Comets: have huge glowing tails.
• Halley's Comet was last seen in: 1986
• Halley's Comet will be next seen in: 2062

Last verified on 18-03-2026

Explanation

The Pythagoras theorem asserts that in a right-angled triangle, the square of the hypotenuse's length (C) is equivalent to the combined sum of the squares of the lengths of the other two sides (A and B)

Pythagoras Theorem:

It states that in a right-angled triangle:

c = √(a² + b²)

where c is the hypotenuse, and a and b are the other two sides.

This formula helps calculate the length of the hypotenuse.

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

An aqueous solution is one where the solute is dissolved in water.

"Aqua" means water, making it the key solvent in such solutions.

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

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

In the sentence "The team has had enough practice":

"Enough" is an adjective modifying the noun "practice" (quantifying it).

"Team" is a noun (subject).

"Practice" is a noun (object).

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.

Explanation

An element with 7 valence electrons needs 1 more electron to complete its octet.

Therefore, its valency is 1, as it tends to gain 1 electron during bonding.