Explanation

When using future perfect tense ("will have passed"), the clause with "when" takes present simple tense — not future.

So, the correct sentence is: "Three hours will have passed when the bell rings."

Explanation

We are told:

• Circumference of a circle = a

• Area of the circle = b

• And a = b

We know the formulas:

• Circumference:

  $$a = 2pi r$$
  

• Area:

  $$b=\pi r^2$$r=0orr=

Since $a = b$, set the formulas equal:

$$2pi r = pi r^2$$

Divide both sides by $pi$:

$$2r = r^2$$

Rearrange:

$$r^2 - 2r = 0 Rightarrow r(r - 2) = 0$$

So the solutions are:

r=0 or r=2

Explanation

A mosquito produces a high-frequency sound, while a lion produces a low-frequency roar.

The difference in frequency is what makes their sounds so distinct to our ears.

Higher frequencies sound more like buzzing or whines, while lower frequencies sound deeper and more powerful.

Explanation

"All will go to Karachi in April."

• "To" is used for direction or destination → go to Karachi.

• "In" is used for months, years, and longer periods → in April.

 So, the correct and natural usage is: to Karachi, in April.

Explanation

Institutions refer to long-standing practices or structures—leadership fits this description.

Passion for knowledge implies a strong desire to understand, making the phrase contextually accurate.

Institutions means ادارے

Passion means جذبہ

Explanation

The eye lens focuses light to form a real and inverted image on the retina.

The brain then processes this image and interprets it as upright.

Explanation

 The correct structure is “so + adjective + that” to show cause and effect.

"The question paper was so complicated that it was completely incomprehensible."

Explanation

Sin (گناہ)
Vice  برائی یا بدکرداری، جو عادت کے طور پر اپنائی جا سکتی ہے اور نقصان دہ ہوتی ہے۔

Explanation

Tuzk-e-Babri, was written initially by Emperor Babur in Chagatai Turkic, which he referred to as "Turki"

Tuzuk-i-Baburi is written by Babur.

Babarnama is also known as Tuzuk-i-Baburi.

Babur and Jahangir are the only two emperors of Mughal Empire who wrote their own biographies.

Explanation

• $172÷5=34.4$ (approximate, doesn't fit exactly)

• $172-138=34$

• $34+6=40$

• $40-22=18$

Observing the sequence, there may be an alternating pattern of subtraction and addition:

• $172 - 138 = 34$

• $34+6=40$

• $40-22=18$

• $18 + 2 = 10$