Q:

Which of the following is essential for the synthesis of thyroxin?

A) Potassium	B) Calcium
C) Iodine	D) Sodium

Answer & Explanation Answer: C) Iodine

Explanation:

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Q:

Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

A) 20	B) 40
C) 23	D) 12

Answer & Explanation Answer: A) 20

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Q:

Which one of the following is a good electrical conductor?

A) Graphite	B) Diamond
C) Peat	D) Charcoal

Answer & Explanation Answer: A) Graphite

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Q:

Which of the following classes of animals has/have three-chambered heart?

A) Pisces and Amphibia	B) Amphibia and Reptilia
C) Reptilia only	D) Amphibia only

Answer & Explanation Answer: B) Amphibia and Reptilia

Explanation:

Mammalian and avian hearts have four chambers two atria and two ventricles.Amphibians and reptiles, by contrast, have a three-chambered heart. The three-chambered heart consists of two atria and one ventricle.Fish possess the simplest type of true heart a two-chambered organ composed of one atrium and one ventricle.

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Filed Under: Biology
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Q:

Pepsin is an enzyme that digests ______.

A) proteins	B) starch
C) carbohydrate	D) fats

Answer & Explanation Answer: A) proteins

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Q:

According to the Indus water treaty which river will be not governed by Pakistan?

A) Indus	B) Chenab
C) Jhelum	D) Ravi

Answer & Explanation Answer: D) Ravi

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Q:

Who coined the term "Ecology"?

A) Ernst Haeckel	B) G. Evelyn Hutchinson
C) Hugo de Vries	D) Robert Brown

Answer & Explanation Answer: A) Ernst Haeckel

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Q:

Why metals conduct electricity?

A) Because of low melting point	B) Because of high tensile strength
C) Because of free electrons	D) Because of high atomic density

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