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

38 16692

Q:

' Misch metal ' is widely used in manufacture of which of the following

A) Material of car brake	B) Smoke detectors
C) Cigarette lighters	D) Emergency lights

Answer & Explanation Answer: C) Cigarette lighters

Explanation:

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Filed Under: Chemistry

49 16681

Q:

What factors would you consider to decide the target audience of your Ad?

Answer

The following are the factors to be considered before deciding the target audience for any advertisements:

Age

Working class (professionals)

Non working class (Retired/Home makers)

Socio economic status

Region specific

Religion/community etc.

Workspace

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Subject: Advertising and Media

15 16666

Q:

Who had founded the first women's university in india?

A) Rani Ahilya Devi	B) Ishwar Chandra Vidyasagar
C) Rani of Thomi	D) Dhondo Keshav Karve

Answer & Explanation Answer: D) Dhondo Keshav Karve

Explanation:

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Filed Under: Indian History

36 16664

Q:

Who among the following persons is called ' Desert Fox '

A) Walter Scott	B) Erwin Rommel
C) Eisenhower	D) Bismarck

Answer & Explanation Answer: B) Erwin Rommel

Explanation:

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Filed Under: Famous Personalities

57 16639

Q:

Name the bird that migrates from the north pole to the south pole and back?

A) Arctic tern	B) Swallow
C) Crane	D) Penguin

Answer & Explanation Answer: A) Arctic tern

Explanation:

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Filed Under: Animals and Birds

186 16638

Q:

The outer membrane that covers the brain is

A) Myelin sheath	B) Dura mater
C) Arachnoid membrane	D) Pia mater

Answer & Explanation Answer: B) Dura mater

Explanation:

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Filed Under: Biology

119 16625

Q:

The reduction potential of hydrogen half-cell will be negative if :
(1) $P (H_{2})$ = 2 atm and [H+] = 2.0 M
(2) $P (H_{2})$ = 1 atm and [H+] = 2.0 M
(3) $P (H_{2})$ = 1 atm and [H+] = 1.0 M
(4) $P (H_{2})$ = 2 atm and [H+] = 1.0 M

A) Option 1	B) Option 2
C) Option 3	D) Option 4

Answer & Explanation Answer: D) Option 4

Explanation:

$H^{+} - e^{-} \to \frac{1}{2} H_{2}$

Apply Nernst equation

$E = 0 - \frac{0.059}{1} \log (\frac{P H_{2}^{\frac{1}{2}}}{[H^{+}]})$

$E = - \frac{0.059}{1} \log (\frac{2^{\frac{1}{2}}}{1})$

Therefore E is Negative

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Filed Under: Chemistry
Exam Prep: AIEEE

26 16603

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