General Science - Mock Test 39

Question 381

A body is charged negatively. It implies that?

A) it has acquired some electrons from outside B) it has lost some of its electrons C) it has lost some of its protons D) None of these

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Question 382

A balloon filled with helium rises in air because?

A) Helium pushes down on the air below the balloon B) Helium is less dense than air C) Air exerts an upward force on the balloon D) The balloon is weightless

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Question 383

Which of the following is the best conductor of electricity?

A) Warm water B) Cold water C) Saline water D) Distilled water

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Question 384

A tree's age can be found by?

A) counting the number of annual rings B) counting the number of branches C) measuring its girth D) measuring its height Show Answer

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Question 385

A substance which changes readily into vapour without heating is called?

A) Effervescent B) Efflorescent C) Synthetic D) Volatile

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Question 386

A solid cannot change its shape easily compared to liquid because of?

A) higher density of solid B) bigger molecular size of solid C) stronger intermolecular force in solid D) larger intermolecualr seperation in solid

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Question 387

A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers?

A) reflection B) refraction C) diffraction D) total internal reflection

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Question 388

A double convex air bubble in water would behave as a ?

A) Convergent lens B) Divergent lens C) Both as convergent and divergent lenses D) None of these

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Question 389

A compound used in medicine as a pain killer is?

A) Ethyl alcohol B) Aspirin C) Urotropine D) Chloroform

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Question 390

A plant with compound leaves?

A) Hibiscus B) Coconut Palm C) Papaya D) Peepal

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