PH | MCQs

Explanation

• Antoine Lavoisier, a French chemist, is credited with discovering the law of conservation of mass in 1789 (1785).
• He demonstrated that matter cannot be created or destroyed in a chemical reaction, only transformed from one substance to another.

Explanation

The mass of the proton is almost 1836 times heavier than that of an electron.

while

A neutron is 1842 times heavier than an electron.

Explanation

• Light travels in a straight line.
• It is also known as a rectilinear path.
• It in a homogeneous medium like air or vacuum.

Explanation

Light travels at about 300,000 kilometers per second in a vacuum with a refractive index of 1.0,

but slows down to 225,000 kilometers per second in water

and 200,000 kilometers per second in the glass.

ND16-3-2023

Explanation

Light is a form of energy.

Light is actually energy made of small particles called photons.

Explanation

The young, thin boy surprised his wrestling opponent with his wiry strength

Wiry means پتلا لیکن طاقتور Someone who is wiry is somewhat thin but is also strong.

wiry is the best option to make a meaningful sentence

ND-8-08-2023

Explanation

The vowel sound in "cool" is a long vowel sound, pronounced /u:/ as in "food."

It is held longer than the short /u/ sound.

Explanation

A diphthong is a complex vowel sound that begins with one vowel and glides into another within the same syllable.

"Toil" contains the diphthong /ɔɪ/ (as in "oil").

Explanation

If there is ing form in first word (giving) we need to use also ing form (receiving) in the last word. 

Giving is better than receiving means دینا وصول کرنے سے بہتر ہے

***

Explanation

An adverb is a word that typically modifies a verb, an adjective,

or another adverb to provide more information about when,

how, where, or to what extent something happens but not a noun.

Additional trick: Mostly words ending with (ly) are all adverbs. But a little bit of explanation below: Noun ke Sath (ly ) ho to adjective bn jata hai. Adjective ke sath ly ho Adverb ban jata hai.e.g Beautiful adjective hai Beautifully adverb hai.