Explanation

Ibn Khaldūn was born on May 27, 1332 in Tunisia.

He died on March 17, 1406, in Cairo, Egypt.

He was an Arab sociologist, philosopher, and historian.

He was  the father of historiography, sociology, economics, and demography studies.

His best-known book, the Muqaddimah or Prolegomena ("Introduction".

Explanation

A seismograph is an instrument used to detect and record earthquakes.

It consists of a mass attached to a fixed base

During an earthquake, the base moves and the mass does not.

Explanation

کلام کا مطلب ہے گفتگو کرنا، چونکہ حضرت موسیؑ اللہ تعالی سے کوہ طور پر کلام کیا کرتے تھے

اسی وجہ انہیں کلیم اللہ بھی کہا جاتا ہے۔

Bibi Safoora the wife of (Prophet Moosa) was the daughter of Prophet:  Hazrat Shoaib A.S

Hazrat Musa also known as Kaleemullah was one of 124,000 prophets of God.

Moses, also known as Moshe Rabbenu

Hazrat Musa was granted 9 miracles

Hazrat Musa (A.S) met with Holy Prophet ﷺ on the 6 heavens. 

ND7-5-2023

Explanation

Ball falls 20m, so time taken is found using:

s = 1/2 gt²

20 = 1/2 × 10 × t²

t = 2s

Vertical velocity when it hits the ground:

v_y = gt = 10 × 2 = 20 m/s

Since it hits at 45°, v_x = v_y = 20 m/s

Explanation

Step 1: Parallel Combination

C_parallel = C + C = 2C

Step 2: Series with Third Capacitor

1/C_eq = 1/2C + 1/C

= (1/2C) + (2/2C)

= 3/2C

C_eq = 2C/3

Explanation

Impossible Situation:

Constant velocity requires zero acceleration (Newton’s First Law).

Variable acceleration would imply a changing net force, which must alter velocity (contradicting "constant velocity").

Possible Situations:

Zero velocity, non-zero acceleration:

Example: A ball at the top of its vertical toss (v=0, a=9.8 m/s² downward).

Velocity east, acceleration west:

Example: A car moving east while braking (deceleration acts west).

Velocity east, acceleration east:

Example: A car speeding up in the east direction.

Explanation

• When blue litmus paper is dipped in an acid, it turns red.
• This is because the acid changes the color of the litmus paper from blue to red.

Note: When red litmus paper is dipped in a base, it turns blue.

Explanation

Ionization energy (potential) is measured in:

• Electron volts (eV) (for single atoms).
• Kilojoules per mole (kJ/mol) (for molar quantities).

Explanation

Water is called the "universal solvent".

Because it dissolves more substances (e.g., salts, sugars, acids) than any other liquid due to its polarity (uneven charge distribution).

Explanation

The biosphere is the global ecological system integrating all living organisms (biotic) and their interactions with the non-living (abiotic) components (e.g., air, water, soil).

It spans from the deepest oceans to the atmosphere, encompassing all ecosystems where life exists.