Explanation

He wanted to know who spoke French

Explanation

A.      Do you always come to the office on a bike?

B.      Do you always come to the office by bike?

In sentence a, the word "riding" is implied. He goes to work by "riding on a bike".

In sentence b, "by bike" is a method of travel. He could go there "by bike" or "by bus" or "by train" or "by car" or "by taxi". Those are all different methods of travel.

Explanation

"Sweets are not liked by us" that is Passive and tense is using here Present continues when we change in Active voice we will use Present Indefinite tense so,

    Us = we

    Are not = do not

    Liked = like

    Sweet= Sweets

Explanation

A meteoroid is a small rocky or metallic body in outer space.

Explanation

Polite the conversation about unimportant or uncontroversial matters, especially as engaged in on social occasions.

Explanation

27 – 21 = √?  + 1

6 = √25 + 1

6 = 5 + 1

6 = 6

Explanation

The speakers receive audio input from a device such as a computer or an audio receiver. This input may be either in analog or digital form. Analog speakers simply amplify the analog electromagnetic waves into sound waves.

Explanation

A hygrometer is an instrument used to measure relative humidity.

Humidity is the measure of the amount of moisture in the air.

A psychrometer is an example of a hygrometer.

Explanation

Several words are sometimes used as adverbs or sometimes used as prepositions.

A word is a preposition when it governs a noun or a pronoun, It is an adverb when it does not.

He moved on. “On” is an adverb here

Keep your books on the table. “On” is a preposition here

Explanation

Enterobacteria phage λ