Explanation

A geostationary satellite orbits the Earth at a speed that matches the Earth's rotation, staying fixed above the same point on the Earth's surface.

This allows it to maintain a constant position relative to the Earth.

Explanation

Insulin production through modern biotechnology involves using genetically modified organisms to produce insulin for treating diabetes.

This method has revolutionized the treatment of diabetes, providing a reliable and abundant supply of insulin.

Explanation

"Who" is used as the subject of a sentence referring to a person.

The sentence is asking about the person performing the action (knocking).

Explanation

The spinal cord controls movement by transmitting signals between the brain and body; damage can cause paralysis.

The severity depends on the injury location, but mobility loss is a common result.

Explanation

"Which" is used when choosing from a known or limited set (like specific paintings).

The sentence is asking to identify one from several, so "Which" fits correctly.

Explanation

Vertical angles are equal. Given:

80° = 4x

Divide both sides by 4:

x = 80° / 4

x = 20°

Explanation

Potassium permanganate (KMnO₄) gives a pink to purple color when dissolved in water, depending on the concentration.

It is commonly used as a disinfectant and in redox reactions.

Explanation

In the lab, oxygen gas is prepared by heating potassium chlorate (KClO₃) in the presence of manganese dioxide (MnO₂) as a catalyst.

MnO₂ speeds up the decomposition of KClO₃ without being consumed.

Explanation

قرآن کریم کے مطابق قتال (لڑائی) صرف فتنہ و فساد کو ختم کرنے کے لیے جائز ہے۔

اس کا مقصد ظلم، جبر اور فساد کو روکنا ہے، نہ کہ زبردستی دین مسلط کرنا۔

Explanation

1 / (2/3)

= 1 × (3/2)

= 3/2