How many rows in the modern Periodic Table...? Mcqs

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How many rows in the modern Periodic Table...?

(A) 5
(B) 6

(C) 7
(D) None of these.

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Dental mirror is what type of a mirror...?

(A) Convex mirror
(B) Concave mirror

(C) Plane mirror
(D) none of these

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Which of the following is both endocrine and exocrine gland...?

(A) thyroid
(B) pancreas

(C) parathyroid
(D) all of these

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T.V. transmission cannot cover a very large area because...?

(A) the strength of T.V. waves is very limited
(B) picture cannot be transmitted clearly after a specific distance

(C) the shape of the earth is spherical
(D) the air is not a good conductor of light and sound/waves

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Which of the following phenomena of light are involved in the formation of a rainbow...?

(A) Refraction
(B) Dispersion

(C) Total internal reflection
(D) All of the above

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Water present in watermelon...?

(A) 92%
(B) 93%

(C) 94%
(D) 95%

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A ______ is an inclined plane wrapped around a cylinder, used to fasten objects....?

(A) Screw
(B) Lever

(C) Pulley
(D) Wheel

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A process in which light rays falls on any material object and these rays bounce back is known as...?

(A) Reflection
(B) Refraction

(C) Diffusion
(D) Absorption

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How is ammonia synthesized...?

(A) Herber process
(B) Regrigration process

(C) Contact process
(D) All of these

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The yellow colour in photochemical smog is due to the presence of____________...?

(A) Sulphur dioxide
(B) Carbon dioxide

(C) Nitrogen dioxide
(D) CFC’s

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