Explanation

Chemical changes involve a transformation where new substances with different properties are created.

It often through reactions like combustion, rusting, or digestion.

Explanation

Escape velocity is the minimum speed a spacecraft needs to completely overcome Earth's gravitational pull without further propulsion.

For Earth, this velocity is approximately 11.2 km/s.

Explanation

Crocus means ایک قسم کا پھول

Crocus means a small yellow, white, or purple spring flower.

Explanation

Isobars are atoms of different elements that have the same mass number but different atomic numbers.

Example: Argon-40 and Calcium-40 both have mass number 40 but different atomic numbers.

Explanation

Oxygen has 8 protons and typically 8 neutrons, giving it a mass number of 16.

Mass number = Number of protons + Number of neutrons.

Explanation

The idiom "flogging a dead horse" means trying to continue with something that has no hope of success.

In this context, it suggests further appeals are pointless and a waste of time.

Explanation

The correct phrasing requires "Was the microwave" to form a proper question about the invention of the microwave.

It follows the structure of asking about the invention of a specific item in the past.

Explanation

Greatest 5-digit number = 99,999

Smallest 4-digit number = 1,000

Sum = 99,999 + 1,000 = 100,999

Explanation

دَاتَا گَنْجْ بَخْش نے مجِستَان میں جنم لیا اور اجمیر میں وفات پائی۔

وہ ایک عظیم صوفی بزرگ تھے۔

ان کا اصل نام سید محمد تھا اور ان کی تعلیمات نے بہت سے لوگوں کو متاثر کیا۔

Explanation

"Listen boys!" is giving a command or instruction, which is the key feature of an imperative sentence.

Imperative sentences often start with a verb and address someone directly.