Q:

The notable hardness of bone is attributed to

A) the presence of inorganic hydroxyapatites	B) the presence of glycoproteins
C) the presence of collagen fibers	D) the presence of cartilage

Answer & Explanation Answer: A) the presence of inorganic hydroxyapatites

Explanation:

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Q:

The light reactions of photosynthesis supply the calvin cycle with

A) CO2and ATP	B) ATP and NADPH
C) light energy	D) H2O and NADPH

Answer & Explanation Answer: B) ATP and NADPH

Explanation:

The light reactions of photosynthesis supply the calvin cycle with ATP and NADPH.

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Q:

Improve the bracketed part of the sentence.
The doctor (has advice) him to take proper diet.

A) has advised	B) had been advised
C) was advised	D) No improvement

Answer & Explanation Answer: A) has advised

Explanation:

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Q:

Which of the following is a property of sodium hydroxide?

A) It is insoluble in ether and other Non-polar solvents	B) It is slowly soluble in water
C) It has an odor of rotten egg smell	D) All the above

Answer & Explanation Answer: A) It is insoluble in ether and other Non-polar solvents

Explanation:

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na+ and hydroxide anions OH−.

Properties:

1. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air.

2. NaOH is insoluble in ether and other non-polar solvents.

3. It is an odorless compound.

Uses:

Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner.

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Q:

Rearrange the parts of the sentence in correct order.

The whole biosphere, like

P : a chemically dynamic state
Q : the individual organisms that
R : live inside it, exists in

A) RQP	B) QRP
C) QPR	D) PQR

Answer & Explanation Answer: B)

QRP

Explanation:

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Q:

Valve between the left ventricle and Aorta?

A) Pulmonic valve	B) Tricuspid valve
C) Aortic valve	D) Mitral valve

Answer & Explanation Answer: C) Aortic valve

Explanation:

The Aortic valve - located between the left ventricle and the aorta

The Mitral valve - located between the left atrium and left ventricle

The Tricuspid valve - located between the right atrium and the right ventricle (and)

The Pulmonary (pulmonic) valve - located between the right ventricle and the pulmonary artery.

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Q:

Select the antonym of
frazzle

A) prostration	B) vigour
C) enervation	D) lassitude

Answer & Explanation Answer: B) vigour

Explanation:

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Q:

Which one of the following is the cause for a change in the season?

A) Earth’s Rotation and Revolution	B) Earth’s Rotation
C) Earth’s Revolution	D) None of the above

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