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Q:

A boat takes 2 hours to travel from point A to B in still water. To find out its speed upstream, which of the following information is/are required?

A. Distance between point A and B.

B. Time taken to travel downstream from B to A.

C. Speed of the stream of water.

A) Only A and B B) Only B and C
C) All are required D) Any one pair of A and B, B and C or C and A is sufficient
 
Answer & Explanation Answer: D) Any one pair of A and B, B and C or C and A is sufficient

Explanation:

Let distance between A & B = d km
Let speed in still water = x kmph
Let speed of current = y kmph

from the given data,
d/x = 2

From A) we get d
From B) we get d/x+y
From C) we get y

 

So, Any one pair of A and B, B and C or C and A is sufficient to give the answer i.e, the speed of upstream.

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Filed Under: Boats and Streams
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Q:

Find the next number in the given number series?

3, 10.5, 36.75, 128.625, ?

A) 295.651 B) 354.146
C) 398.78 D) 450.187
 
Answer & Explanation Answer: D) 450.187

Explanation:

Here the given number series  3, 10.5, 36.75, 128.625, ? follows a pattern that

3

3 x 3.5 = 10.5

10.5 x 3.5 = 36.75

36.75 x 3.5 = 128.625

128.625 x 3.5 = 450.187

 

Hence the next number in the given number series is 450.187.

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Filed Under: Odd Man Out
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Q:

The longest ship canal in the world is the

A) Suez canal, Egypt B) Kiel canal, Germany
C) Panama canal, Central America D) St. Laurence Seaway (USA and Canada)
 
Answer & Explanation Answer: D) St. Laurence Seaway (USA and Canada)

Explanation:
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Filed Under: World Geography
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Q:

Which of the following is tropical grassland?

A) Savannah B) Pampas
C) Prairies D) Taiga
 
Answer & Explanation Answer: A) Savannah

Explanation:

Tropical grasslands, or savannas, are also the homes of primates in Africa and Asia; no savanna-living primates exist in South America. Tropical grasslands comprise a mixture of trees and grasses, the proportion of trees to grass varying directly with the rainfall.

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Filed Under: Indian Geography
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Q:

Lux is the SI unit of

A) luminous flux B) luminous efficiency
C) intensity of illumination D) luminous intensity
 
Answer & Explanation Answer: C) intensity of illumination

Explanation:

The lux (lx) is the SI derived unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square meter.

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Filed Under: Physics
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Q:

Which organelle is the control center of a cell?

A) Nucleus B) Cytoplasm
C) Cell membrane D) endoplasmic reticulum
 
Answer & Explanation Answer: A) Nucleus

Explanation:

Nucleus serves as the control center for cell metabolism and reproduction.

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Filed Under: Biology
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Q:

When a computer prints a report this output is called

A) Soft copy B) Hard copy
C) Printing D) Program
 
Answer & Explanation Answer: B) Hard copy

Explanation:

Hard copy is the output which is printed by the computer.

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Filed Under: Computer
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Q:

Not including the sun, the closest stars to earth are

A) 4300 light-years away B) 430 light-years away
C) 43 light-years away D) 4.3 light-years away
 
Answer & Explanation Answer: D) 4.3 light-years away

Explanation:

The nearest stars to Earth are in the Alpha Centauri triple-star system, about 4.37 light-years away. One of these stars, Proxima Centauri, is slightly closer, at 4.26 light-years.

 

Of all the stars closer than 15 light-years, only two are spectral type G, similar to our sun: Alpha Centauri A and Tau Ceti. The majority are M-type red dwarf stars.

 

Only nine of the stars in this area is bright enough to be seen by the naked human eye from Earth. These brightest stars include Alpha Centauri A and B, Sirius A, Epsilon Eridani, Procyon, 61 Cygni A and B, Epsilon Indi A and Tau Ceti.

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Filed Under: World Geography
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