Explanation

We are given the expression:

100² − 99²

This is a difference of squares:

a² − b² = (a − b)(a + b)

So:

100² − 99² = (100 − 99)(100 + 99) = 1 × 199 = 199

Explanation

7 + 2 - 1 = 8 → H  

22 + 8 - 6 = 24 → W

Now match the number to alphabet (A = 1, B = 2, ..., Z = 26):

- 8 = H

- 24 = X, not W (W = 23) → So seems like small mistake here in example.

Let’s check:

7 + 2 - 1 = 8 → H (correct)  

22 + 8 - 6 = 24 → should be X, not W

Now solve:

11 + 6 - 1 = 16 → 16th letter is P

Explanation

Work is inversely proportional to the number of men.  

So,  

(120 men × 90 days) = (270 men × x days)  

⇒ 10800 = 270x  

⇒ x = 10800 / 270  

⇒ x = 40 days

Explanation

 Motor nerves carry signals from the brain and spinal cord to muscles, causing them to contract and produce movement.

- Sensory nerves do the opposite — they carry information from the body to the brain (like touch, pain, temperature).

- Mixed nerves contain both sensory and motor fibers and serve both functions.

- Cranial nerves can be sensory, motor, or mixed, but not all of them control muscle movement.

Explanation

The brain is divided into two hemispheres: the right and left cerebrum.

- Left Cerebrum is dominant for:

  - Logical reasoning  

  - Language  

  - Analytical thinking  

  - Mathematical calculations  

  - Reading and writing  

- Right Cerebrum is dominant for:

  - Creativity  

  - Artistic skills  

  - Intuition  

  - Spatial ability  

  - Recognizing faces and patterns  

- Mnemonic:  

  - Left = Logic, Right = Creativity

Explanation

Total parts = 4 + 3 + 5 = 12
One part = 4800 ÷ 12 = 400

C’s share = 5 × 400 = 2000

Explanation

Ammonia reacts with carbon dioxide to form:

Urea (NH₂CONH₂)

Reaction Equation:

2NH₃ + CO₂ → NH₂CONH₂ + H₂O

- Urea is a nitrogen-rich compound used primarily as a fertilizer.

- The process is part of the Bosch-Meiser process (also called the urea cycle in industrial production).

- Ammonia (NH₃) and Carbon Dioxide (CO₂) are key raw materials obtained from natural gas reforming.

- Water (H₂O) is produced as a byproduct.

- Urea contains 46% nitrogen, making it one of the most concentrated nitrogen fertilizers.

- Urea is also used in plastics, resins, and animal feed.

Industry Use:  

- Fertilizer industry  

- Chemical manufacturing  

- Agriculture

Explanation

 Ammonium Nitrate is a chemical compound made from:

  - Ammonium ion (NH₄⁺)

  - Nitrate ion (NO₃⁻)

- It is widely used in:

  - Fertilizers (due to its high nitrogen content)

  - Explosives (when mixed with fuel oil - ANFO)

  - Cold packs (due to their endothermic dissolution)

Molecular Formula: NH₄NO₃  

Molar Mass: 80.04 g/mol

Explanation

FIA stands forThe Federal Investigation Agency

Federal Investigation Agency as mentioned in section 2 of the FIA Act 1974. 

FIA was Codified under the Constitution of Pakistan in 1974,

FIA Formed: 13 January 1975

(FIA) has its headquarters in Islamabad.

FIA Parent agency: Ministry of Interior

Major Units: 13

How many members can be appointed in FIA?

As per Federal Govt. policy and vacant seats

ND12_8_2023

Explanation

The cerebrum is the largest part of the brain.

The largest part of the brain, the cerebrum has two hemispheres (or halves).

The cerebrum controls voluntary movement, speech, intelligence, memory, emotion, and sensory processing.

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RY4-12-2022