Explanation

The correct preposition with "concerned" in this context is "about", meaning to be worried or aware of something.

Example: We should be concerned about climate change and its effects.

Explanation

To simplify the expression, follow the rules of exponents:

(x⁴)³ = x^(4×3) = x¹²

Now, divide x¹² by x⁻⁴:

x¹² ÷ x⁻⁴ = x¹² × x⁴ (since dividing by x⁻⁴ is the same as multiplying by x⁴)

= x^(12+4)

= x¹⁶

Explanation

Scuba tanks contain a mixture of nitrogen (N₂) and oxygen (O₂), commonly called compressed air or nitrox.

Nitrogen prevents oxygen toxicity at high pressures, which can occur in deep-sea diving.

Explanation

When comparing two things, we usually use better, but since "this is the" is present, we need the superlative form (best).

Good is the positive form.

Explanation

Not is an adverb because it modifies the verb are, indicating negation.

Adverbs often describe how, when, where, or to what extent an action occurs.

Explanation

حضرت ابوبکر رضی اللہ عنہ کا اصل نام عبداللہ بن ابی قحافہ تھا۔

عبد الکعبہ ان کا اسلام قبول کرنے سے پہلے کا نام بھی روایت میں آتا ہے، جسے بعد میں عبداللہ کر دیا گیا۔

Explanation

Dr. Ruth Pfau

• Date of Birth: 9 September 1929
• Date of Death: 10 August 2017
• Other Name: Mother Teresa of Pakistan (due to her work for leprosy patients)

Major Awards:

• Hilal-e-Imtiaz (Pakistan)
• Hilal-e-Pakistan
• Nishan-e-Quaid-i-Azam
• Staufer Medal (Germany)
• Dame of the Order of St. Gregory the Great (by Pope)

Explanation

To find the GST amount, multiply the cost of the milk powder by the GST percentage:

GST = 500 × 16/100

= 500 × 0.16

= 80

Explanation

Given that x = 3 is a solution to the equation:

x² + rx - 20 = 4

Substitute x = 3 into the equation:

(3)² + r(3) - 20 = 4

Simplify:

9 + 3r - 20 = 4

Combine like terms:

3r - 11 = 4

Add 11 to both sides:

3r = 15

Divide by 3:

r = 5

Explanation

Lord Wavell convened the Simla Conference in June 1945 to discuss India's political future.

The main issue was the representation of Muslims, but the talks failed due to disagreements between the Muslim League and Congress.