Explanation

Number of neutrons = Mass number − Atomic number = 19 − 9 = 10

Atomic number (9) is the number of protons; mass number (19) is protons + neutrons.

Explanation

Red Blood Cells (RBCs) are disc-shaped with a central depression (biconcave), not irregular in shape.

Their regular shape helps efficient oxygen transport throughout the body.

Explanation

Neuter gender refers to non-living things; knife is an object, so it is neuter.

Mother and wife are feminine (living beings).

Explanation

The gall bladder stores and concentrates bile produced by the liver.

Bile helps in the digestion and absorption of fats in the small intestine.

Explanation

"Neater" is the correct comparative form of the adjective "neat" to compare two things.

The comparative adjective "neater" is used to show the difference between two items (his handwriting vs. hers).

Explanation

Given:

Height of the hill = 240 m

Angle of depression to the top of the minaret = 30°

Angle of depression to the bottom of the minaret = 60°

Let's denote the distance from the base of the hill to the minaret as x.

For the bottom of the minaret (60° angle):

tan(60°) = 240 / x

√3 = 240 / x

x = 240 / √3

For the top of the minaret (30° angle):

tan(30°) = (240 - h) / x

1/√3 = (240 - h) / (240 / √3)

Simplifying:

240 - h = 240 / 3

240 - h = 80

h = 160

Explanation

Observation allows learners to explore, analyze, and understand concepts independently.

It promotes curiosity and critical thinking, making it highly effective for self-learning.

Explanation

Explanation

حضرت ابو طالب کی وفات رجب 10 نبوی میں ہوئی۔

ان کی وفات کے بعد یہ سال عام الحزن (غم کا سال) کہلایا۔

Explanation

لاحقہ وہ لفظی جز ہوتا ہے جو کسی لفظ کے آخر میں آ کر اس کا مفہوم بدل دیتا ہے۔"

گری ایک لاحقہ ہے جو پیشے یا خصوصیت کو ظاہر کرتا ہے، جیسے "ساہ گری" (سوداگر کا پیشہ)۔