Explanation

"Circumstances" fits the context, as it refers to the factors or conditions leading to flight cancellation.

"Investigate" makes sense as the action the Minister would take to look into the matter.

Explanation

Prime Minister Imran Khan laid the foundation stone of the Kartarpur Corridor on 28 November 2018 near Narowal, Pakistan.

The corridor was established to allow Indian Sikh pilgrims visa-free access to Gurdwara Darbar Sahib Kartarpur.

The corridor was officially inaugurated on 9 November 2019.

Explanation

The Paschen series involves electron transitions ending at the third energy level (n=3) in a hydrogen atom.

These transitions emit photons in the infrared region of the electromagnetic spectrum.

Explanation

"If you lose your passport, you will be in great trouble."

In a first conditional sentence, we use the present simple tense in the if clause and the future simple (will + verb) in the main clause.

Here, "lose" (present simple) is correct because it is used in the if clause to indicate a possible future event.

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

"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."