In 1869 Mandeleev put forward his periodic law about _____...? Mcqs

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In 1869 Mandeleev put forward his periodic law about _____...?

(A) Atomic Number
(B) Chemical properties

(C) Physical properties
(D) Atomic Mass

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Animals which are at the risk of extinction in future called...?

(A) Vulnerable
(B) Extinct

(C) Threatened
(D) Endangered

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Earth rotates the sun in___________...?

(A) 23 hours 56 min 4 sec
(B) 24 hours

(C) 23 hours 57 min 9 sec
(D) Non of above

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Which bird has legs but can’t walk ...?

(A) Loons
(B) Grebes

(C) Hummingbirds
(D) None of these

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Quantity of fresh air required for a man is 1000 cubic feet of air for every____________...?

(A) 5 minutes
(B) 10 minutes

(C) 15 minutes
(D) 20 minutes

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The study Of GLANDS is called...?

(A) cardiology
(B) None of these

(C) Endocrinology
(D) Entomology

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Less than one percent of Earth’s water is fresh water but Ocean contains what percent of the total water of planet Earth...?

(A) 99%
(B) 89%

(C) 77%
(D) 97%

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When you put a drop of ink into water, why is the colour of ink moving in the glass...?

(A) Due to motion of molecules of water
(B) Due to motion of molecules of ink

(C) Due to gravity
(D) Due to light energy

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Water has been discovered on which potentially habitable super-Earth ...?

(A) K2-14d
(B) K2-15c

(C) K2-13a
(D) K2-18b

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The water has minimum density at _____...?

(A) O°C
(B) 2°C

(C) 3°C
(D) 4°C

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