Physics - Mock Test 37

Question 361

A lens, which is thicker at the center and thinner at the edges is called?

A) concave lens B) convex lens C) plano convex lens D) plano concave lens

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Question 362

The electrical signals change into light signals for transmission through optical fibre. A light pulse represent?

A) zero (0) B) One (1) C) both zero (0) and one (1) D) neither zero (0) nor one (1)

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Question 363

There is no noticeable boundary between core and cladding?

A) multi mode step index fibre B) multi mode graded index fibre C) single mode step index fibre D) all types of fibre

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Question 364

Critical angle is that incident angle in denser medium for which angle of refraction is?

A) 0? B) 45? C) 90? D) 180?

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Question 365

Which one type of fibre is more suitable for transmission of signals in which white light is used ?

A) mono mode step index fibre B) multi mode step index fibre C) multi mode graded index fibre D) single mode step index fibre

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Question 366

Light signals passes through multimode graded index fibre due to?

A) continuous refraction B) total internal reflection C) both continuous refraction and total internal reflection D) diffraction

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Question 367

Dispersional effect may produce error in light signals. This type of error?

A) single mode step index fibre B) multimode step index fibre C) multimode graded index fibre D) monomode step index fiber

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Question 368

In multimode step index fibre the refractive index of core and cladding is?

A) same B) different C) zero D) different with refractive index of core higher than cladding

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Question 369

For normal adjustment, length of astronomical telescope is?

A) fo + fe B) fo - fe C) fo / fe D) fe / fo

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Question 370

Final image produced by a compound microscope is?

A) real and inverted B) real and erect C) virtual and erect D) virtual and inverted

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