Q:

In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers?

Answer

Zero. You are selecting names from the list, so they are all listed.

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Subject: Math Puzzles

6 7072

Q:

Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

A) K1k2/k1+k2	B) 2k1k2/k1+k2
C) K1+k2/k1k2	D) None

Answer & Explanation Answer: B) 2k1k2/k1+k2

Explanation:

We know that,

The equivalent K = $\frac{L 1 + L 2}{\frac{L 1}{K 1} + \frac{L 2}{K 2}}$

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

But here L1 = L2 = L (say)

Then K = L+L/(L/K1 + L/K2) = $\frac{2 K 1 K 2}{K 1 + K 2}$

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Filed Under: Physics
Exam Prep: GATE , Bank Exams , AIEEE
Job Role: Network Engineer

12 7069

Q:

An object at rest may have

A) Momentum	B) Potential energy
C) Velocity	D) Kinetic energy

Answer & Explanation Answer: B) Potential energy

Explanation:

An object at rest may have Potential energy.

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Filed Under: Physics
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Job Role: Analyst , Bank Clerk , Bank PO

14 7068

Q:

Which of the following element is NOT a metal?

A) Al	B) P
C) Ca	D) K

Answer & Explanation Answer: B) P

Explanation:

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Filed Under: Chemistry
Exam Prep: AIEEE , Bank Exams

1 7068

Q:

Germany signed the Armistice Treaty on ____ and World War I ended

A) January 19, 1918	B) May 30, 1918
C) November 11, 1918	D) February 15, 1918

Answer & Explanation Answer: C) November 11, 1918

Explanation:

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Filed Under: General Awareness

20 7063

Q:

Central processing unit is combination of

A) Arithmetic and Control unit	B) Control and Output unit
C) Control and Storage unit	D) Arithmetic logic and input unit

Answer & Explanation Answer: A) Arithmetic and Control unit

Explanation:

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Filed Under: Computer
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9 7060

Q:

Gold and silver are extracted from their respective ores by _______

A) Smelting	B) Roasting
C) Leaching	D) Hydro metallurgy

Answer & Explanation Answer: D) Hydro metallurgy

Explanation:

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Filed Under: Chemistry

24 7059

Q:

Select the synonym of

deviance

A) accordance	B) compliance
C) alliance	D) aberrance

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