Physics - Mock Test 39

Question 381

Dioptre power of an concave lens of 10 cm focal length is?

A) 10 dioptre B) 10 dioptre C) 1 / 10 dioptre D) 1 / 10 dioptre

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Question 382

Unit of power of a lens is?

A) meter B) watt C) dioptre D) horsepower

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Question 383

In going form a denser to rarer medium a ray of light is?

A) undeviated B) bent away form the normal C) bent towards the normal D) polarized

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Question 384

The diameter of a lens is called?

A) focal length B) principal axis C) aperture D) radius of curvature

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Question 385

A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called?

A) center of curvature B) focus C) optical center D) aperture

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Question 386

A lens which converges a beam of parallel rays to a point is called?

A) diverging (or concave) lens B) converging (or convex) lens C) plano concave lens D) plano convex lens

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Question 387

The energy absorbed by a body is ________________ at resonance?

A) maximum as well minimum B) minimum only C) maximum only D) zero

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Question 388

In case of a simple pendulum the cause of damping is?

A) drag force of air B) gravity C) tension in string D) none of these

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Question 389

A cup of milk is placed in a microwave oven. Tell which statements is false (1) Milk will be heated up only (2) Cup will remain cool (3) Both cup and mild will get hot?

A) both B) 1 C) 2 D) 3

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Question 390

The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body?

A) 10 cm B) 5 cm C) 15 cm D) 7.5 cm

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