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Q:

Which of the following plays an important part in photosynthesis?

A) Chloroplast	B) Centrosome
C) Tonoplast	D) Nematoblast

Answer & Explanation Answer: A) Chloroplast

Explanation:

The Chloroplast contains the wonder green pigment chlorophyll which is able to trap solar energy and use it for synthesis of food

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Filed Under: Biology

Q:

Which of the following organelle is known as the 'Power House' of the cell?

A) Golgi Bodies	B) Ribosomes
C) Mitochondria	D) None of these

Answer & Explanation Answer: C) Mitochondria

Explanation:

Mitochondria are known as 'Power House' of the cell because they produce energy in the form of ATP.

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Filed Under: Biology

Q:

The soaps used in shaving cream are

A) Calcium soaps	B) lead soaps
C) soft soaps	D) hard soaps

Answer & Explanation Answer: C) soft soaps

Explanation:

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Filed Under: Chemistry

Q:

The main element used in the vulcanisation of rubber is

A) nickel	B) copper
C) sulphur	D) graphite

Answer & Explanation Answer: C) sulphur

Explanation:

In vulcanization, cruder rubber is heated with 3% sulphur at about for $120^{0} C$ for 2-3 hours.

Vulcanised rubber is a vastly improved product.

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Filed Under: Chemistry
Exam Prep: AIEEE , GATE

Q:

Acute diabets patients smell of

A) acetone	B) ether
C) ethyl alcohol	D) methyl alcohol

Answer & Explanation Answer: A) acetone

Explanation:

Acute diabetes results in the formation of acetone in the body. Hence such patients smell of acetone.

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Filed Under: Chemistry

Q:

Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise

A) it becomes coloured	B) it gets evaporated in air
C) it gets oxidised to phosgene	D) it gets decomposed to chloropicrin

Answer & Explanation Answer: C) it gets oxidised to phosgene

Explanation:

Chloroform, $C H C l_{3}$ is easily oxidised to the highly poisonous gas known as phosgene or carbonyl chloride COCl2. Hence if it is used as anaesthetic it should be kept free from sunlight and air.

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Filed Under: Chemistry
Exam Prep: AIEEE

Q:

Dust particles in the air of large industrial cities are removed by

A) Sedimentation	B) Electrophoresis
C) Tyndall effect	D) Brownian movement

Answer & Explanation Answer: B) Electrophoresis

Explanation:

Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.

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Filed Under: Chemistry

Q:

Stainless steel contains steel and

A) manganese	B) vanadium
C) nickel	D) chromium

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