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 16392

Q:

Missing letters puzzle

Answer

Answer: V

Explanation: Starting at the top left, and moving anti-clockwise around the figure, letters advance through the alphabet 5 letters at a time.

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Subject: Missing letters puzzles

78 16345

Q:

How many minutes is it until 6 o'clock if 50 minutes ago it was 4 times as many minutes past 3 o'clock ?

A) 26 min	B) 24 min
C) 22 min	D) 20 min

Answer & Explanation Answer: A) 26 min

Explanation:

Let the required number of minutes = M
Total minutes between 3o'clock and 6o' clock = 180 minutes
M + 50 + 4M = 180
5M + 50 = 180
5M = 130
M = 26 minutes.

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Filed Under: Clock puzzles
Exam Prep: Bank Exams , CAT
Job Role: Bank Clerk , Bank PO

27 16338

Q:

What goes in the water black and comes out red

Answer

A Lobster is one which goes black in water and comes out red.

lobster1585556605.jpg image

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Subject: Word Puzzles Exam Prep: GRE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk , Analyst

45 16329

Q:

In terms of population which is the largest city of China?

A) Beijing	B) Shanghai
C) Guanzhou	D) Shenzhen

Answer & Explanation Answer: B) Shanghai

Explanation:

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Filed Under: World Geography
Exam Prep: Bank Exams

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Q:

Read the following information carefully and answer the questions that follow:

Seven persons Tina, Vini, Yasir, Rishi, Sanya, Pankaj and Urmila live on the separate floors of a 7- floor building. Ground floor is number one; second floor is number two and so on. Each of them goes to a city viz. Paris, Istanbul, Shanghai, Durban, London, Madrid and Dubai but not necessarily in the same order.

Only three people live above the floor on which Sanya lives. Only one person lives between Sanya and the one who goes to Paris. Vini lives just below the person who goes to Madrid. Only three people live between the one who goes to Paris and London. The person who goes to Madrid lives on an even numbered floor. Urmila lives just above Rishi. Urmila does not go to London. Only two persons live between Pankaj and the one who goes to Durban. Pankaj lives above the person who goes to Durban. Yasir does not go to Istanbul. Tina does not live just above or just below Sanya. The one who goes to Shanghai does not live just above or just below Pankaj.

Who among the following lives on floor number 7?

A) Tina	B) Yasir
C) Pankaj	D) Urmila

Answer & Explanation Answer: A) Tina

Explanation:

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Filed Under: Verbal Reasoning - Mental Ability

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Q:

The plateau rich in minerals in india is

A) Malwa plateau	B) Chhota Nagpur Plateau
C) Deccan Plateau	D) Mysuru Plateau

Answer & Explanation Answer: B) Chhota Nagpur Plateau

Explanation:

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Filed Under: Indian Geography

52 16273

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
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