Blog Log in Get Started Free

NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

● ● ● ● ●

$\overset{H}{\overset{|}{{CH}_{2}}} - \overset{Cl}{\overset{|}{{CH}_{2}}} \to_{alk .}^{NaOH} {CH}_{2} = {CH}_{2}$

Most probable mechanism for this reaction is-

$E 1_{C B}$

$α$ elimination

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

strong basic medium generally gives E 2 mechanism.

● ● ● ● ●

Propadiene, $C_{3} H_{4}$ molecule contains –

Two $s p^{2}$ and one sp hybrid carbon

One $s p^{2}$ and two sp hybrid carbons

One $s p^{2}$ and three sp hybrid carbons

None of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which one of the following is not a common component of photochemical smog?

Ozone

Acrolein

Peroxyacetyl nitrate

Chlorofluorocarbons

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which one of the following statements regarding photochemical smog is not correct?

Carbon monoxide does not play any role in photochemical smog formation

Photochemical smog is an oxidising agent in character

Photochemical smog is formed through photochemical reaction involving energy

Photochemical smog does not cause irritation in eyes and throat

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(d) Photochemical smog is formed in warm and sunny climate during day time by the action of sunlight on primary pollutants. It contains nitrogen oxides , ozone, PAN etc., which are oxidising in nature. So, photochemical smog is an oxidising agent in character. It causes irritation in eyes and throat.

● ● ● ● ●

Which one of the following statements is not true?

Concentration of DO below 6 ppm is good for the growth of fish

Clean water would have a BOD value of less than 5 ppm

Oxides of sulphur, nitrogen and carbon arc the most widespread air pollutant

pH of drinking water should be between 5.5-9.5

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Growth of fish is inhibited if concentration of DO is below 6 ppm.

● ● ● ● ●

Biosphere is

In which individual interact to each other

By which life originated

The name of a bird

Organic compound by which life diminishes

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

All of the ecosystems in the world make up the biosphere. Plants take in carbon dioxide and release oxygen, thus transferring carbon from the atmosphere into the biosphere, where it stays until the plant dies

● ● ● ● ●

Which is not a renewable source

sunlight

Coal

Water

wind energy

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Coal is a non renewable source

● ● ● ● ●

Noosphere is synonyms of

Environment

Atmosphere

Hydrosphere

Stratosphere

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Noosphere is synonym of environment. It is is the sphere of human thought. The noosphere is the third in a succession of phases of development of the Earth, after the geosphere (inanimate matter) and the biosphere (biological life)

● ● ● ● ●

When biosphere turns into human-dominated environment it is called

Noosphere

Troposphere

Mesosphere

Man sphere

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The noosphere is a dynamic manifestation of the most advanced life-form on this planet, Homo sapiens , realized through the complex mental activity in which only humans engage. The noosphere

● ● ● ● ●

The living organisms on or around the earth constitute

Biome

Biosphere

Community

Biocoenosis

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

biosphere Sentence Examples. All of the ecosystems in the world make up the biosphere.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.