Explanation

Chlorine is the gas used to disinfect and purify water.

It is passed through water to kill bacteria.

Explanation

Electric power: Rate of energy transfer.

It is measured in watts (W), or one joule per second.

Energy/Work: Measured in joules (J).

Charge: Measured in coulombs (C).

Pressure: Measured in pascals (Pa).

Electric current: Measured in amperes (A).

Electric resistance: Measured in ohms (Ω).

Temperature: Measured in kelvin (K).

Torque: Measured in newton metres (N m).

Velocity: Measured in meters per second (m/s).

Acceleration: Measured in meters per second squared (m/s²).

Explanation

Health is preferable to riches. 

صحت دولت سے افضل ہے۔

Generally preferable is followed by To.

Explanation

Bound for is an idiom which means  منزل کی جانب رواں دواں

This flying coach is bound for Karachi.

AGM 02.05.2023

Explanation

The present perfect continuous is formed with have/has been and the -ing form of the verb.

We normally use the present perfect continuous to emphasize that something is still continuing in the present.

Here the person is asking “how long have you been learning?”, this sentence is a present perfect continuous because the subject is still learning English.

Explanation

Students are advised to write (their names) in ink. 

when we use ( pen) to write, we use ( ink) instead of (pen).

Then we have to use the preposition ( in ) but not ( with). Eg. I write in ink.

Explanation

If someone is burning the midnight oil, they are staying up very late in order to study or do some other work.

Here all the other idioms are incorrect.

Explanation

Keeping body and soul together means: having or get enough food and money to survive.

Here all the other idioms are incorrect.

Explanation

Explanation

A biological species is a group of organisms

that can reproduce with one another in nature and produce fertile offspring.

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ND17-1-2023