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Q:

Ashwin fires two bullets from the same place at an interval of 15 minutes but Rahul sitting in a bus approaching the place hears the second sound 14 minutes 30 seconds after the first. If sound travels at the speed of 330 meter per second, what is the approximate speed of bus?

A) 330/29 m/s	B) 330 x 30 m/s
C) 330/14 m/s	D) 330/900 m/s

Answer & Explanation Answer: A) 330/29 m/s

Explanation:

Second gun shot take 30 sec to reach rahul imples distance between two.

given speed of sound = 330 m/s

Now, distance = 330 m/s x 30 sec

Hence, speed of the bus = d/t = 330x30/(14x60 + 30) = 330/29 m/s.

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Filed Under: Time and Distance
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Q:

When should you stop at green and go at red?

Answer

While eating a watermelon, we all go along the red and stops at green.

Workspace

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Subject: Logic Puzzles Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE
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Q:

Which organization is an interest group?

A) The National Rifle Association	B) The National Right to Life organization
C) The National Organization for Women	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

An interest group is an organization whose members share common concerns and try to influence government policies affecting those concerns. Interest groups are also known as lobbies.

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Filed Under: World Organisations
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Q:

Light travels fastest in

A) Air	B) Water
C) Glass	D) Diamond

Answer & Explanation Answer: A) Air

Explanation:

Light travels fastest in Vacuum. The fastest thing in the whole universe is the speed of light in a vacuum like outer space. It is about 2.99 x 10⁸ m/s.

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Filed Under: Physics
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Q:

Who was the first englishman to sail around the world?

A) Magellan	B) Sir Francis Drake
C) Juan Sebastian Elcano	D) Henry Hudson

Answer & Explanation Answer: B) Sir Francis Drake

Explanation:

Sir Francis Drake was the first Englishman to sail around the world.

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Filed Under: General Awareness
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Q:

Which continent has the least countries?

A) Africa	B) South America
C) Antarctica	D) Europe

Answer & Explanation Answer: C) Antarctica

Explanation:

Africa - 54 countries

South America - 12 countries

Antarctica - 0 countries

Europe - 43 countries.

Hence, Antarctica continent has the least countries.

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Filed Under: World Geography
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Q:

A man went downstream for 28 km in a motor boat and immediately returned. It took the man twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow.

A) 12 km/hr, 3 km/hr	B) 9 km/hr, 3 km/hr
C) 8 km/hr, 2 km/hr	D) 9 km/hr, 6 km/hr

Answer & Explanation Answer: B) 9 km/hr, 3 km/hr

Explanation:

Let the speed of the boat = p kmph

Let the speed of the river flow = q kmph

From the given data,

$2 x \frac{28}{p + q} = \frac{28}{p - q}$

=> 56p - 56q -28p - 28q = 0

=> 28p = 84q

=> p = 3q.

Now, given that if

$\frac{28}{3 q + 2 q} + \frac{28}{3 q - 2 q} = \frac{672}{60} = > \frac{28}{5 q} + \frac{28}{q} = \frac{672}{60} = > q = 3 kmph = > x = 3 q = 9 kmph$

Hence, the speed of the boat = p kmph = 9 kmph and the speed of the river flow = q kmph = 3 kmph.

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Filed Under: Boats and Streams
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Q:

Which letter indicates systolic pressure?

A) i	B) b
C) c	D) a

Answer & Explanation Answer: D) a

Explanation:

a - at the peak of changes in blood pressure indicates the systiolic pressure.

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Filed Under: Biology
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