Q:

An incident ray strikes a plane mirror at an angle of 20 deg with the mirror. The angle between the incident ray and reflected ray is ____.

A) 140 deg	B) 40 deg
C) 50 deg	D) 20 deg

Answer & Explanation Answer: A) 140 deg

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Q:

Plants utilise ________ from the atmosphere foe photosynthesis

A) oxygen	B) nitrogen
C) Carbon dioxide	D) hydrogen

Answer & Explanation Answer: C) Carbon dioxide

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Filed Under: Biology

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Q:

Which organisms can help to carry out Vermicomposting?

A) Nitrifying Bacteria	B) Earthworms
C) Algae	D) Fungus

Answer & Explanation Answer: B) Earthworms

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Q:

Which type of pathogen causes the waterborne disease HepatitisA?

A) Parasitic	B) Viral
C) Protozoan	D) Bacterial

Answer & Explanation Answer: B) Viral

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Q:

Why do atoms bond?

A) To reduce potential energy and gain stability	B) To make atoms
C) To increase potential energy and lose stability	D) To increase potential energy and gain stability

Answer & Explanation Answer: A) To reduce potential energy and gain stability

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Q:

Common salt (NaCl) is made up of

A) a weak acid and a weak base	B) a strong acid and a weak base
C) a weak acid and a strong base	D) a strong acid and a strong base

Answer & Explanation Answer: D) a strong acid and a strong base

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Q:

Which of the following is an amphoteric oxide?

A) Aluminium oxide	B) Iron oxide
C) Magnesium oxide	D) Carbon dioxide

Answer & Explanation Answer: A) Aluminium oxide

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Q:

If hiring an extra worker increases a factory's output from 1000 to 1200 units per day, but the factory has to reduce the price of its product from Rs. 25 to Rs. 24 per unit to sell the additional output, the marginal revenue product of the last worker is

A) Rs. 3800	B) Rs. 200
C) Rs. 4000	D) Rs. 100

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