Q:

A periscope works by the principle of

A) Total internal reflection	B) Refraction
C) Diffraction	D) Reflection & Refraction

Answer & Explanation Answer: A) Total internal reflection

Explanation:

A periscope is an optical instrument that uses a system of prisms, lenses, or mirrors to reflect images through a tube.

per11526634345.jpg image

Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye.

Hence, A periscope works by the principle of Total internal reflection.

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Filed Under: Physics
Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk , Analyst

37 14169

Q:

Rearrange the parts of the sentence in correct order.

The NSG

P- of nuclear trade, spelt out in its guidelines and trigger-lists
Q- covering every aspect
R- has already made its rules,

A) QRP	B) QPR
C) PRQ	D) RQP

Answer & Explanation Answer: D) RQP

Explanation:

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Filed Under: English
Exam Prep: Bank Exams

0 14156

Q:

Two cubes have their volumes in the ratio 1 : 27. Find the ratio of their surface areas.

A) 2:9	B) 3:9
C) 1:9	D) 4:9

Answer & Explanation Answer: C) 1:9

Explanation:

Let their edges be a and b. Then,

a3/b3 = 1/27 (or) (a/b)3 = (1/3)3 (or) (a/b) = (1/3).

\Ratio of their surface area = 6a2/6b2 = a2/b2 = (a/b)2 = 1/9, i.e. 1:9.

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Filed Under: Quantitative Aptitude - Arithmetic Ability

31 14142

Q:

What is page cannibalizing?

Answer

Page swapping or page replacements are called page cannibalizing.

Workspace

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Subject: Operating Systems

22 14141

Q:

Which of the following has largest atomic radius?

A) Li	B) Be
C) B	D) O

Answer & Explanation Answer: A) Li

Explanation:

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Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

0 14141

Q:

Who wrote a book describing the theory of economic drain of India during British rule

A) Late lajpat rai	B) Mahatma Gandhi
C) Jawaharlal nehru	D) Dadabhai naoroji

Answer & Explanation Answer: D) Dadabhai naoroji

Explanation:

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Filed Under: Indian Economy

23 14139

Q:

Improve the bracketed part of the sentence.

There is a compelling case for privatising the airline and freeing (locked at) funds for education and health.

A) locked of	B) locked on
C) locked up	D) No improvement

Answer & Explanation Answer: C) locked up

Explanation:

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Filed Under: English

0 14133

Q:

Syadvada was the fundamental basis of which religion?

A) Buddhism	B) Jainism
C) Vaishnavism	D) Shaivism

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