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Q:

3 pumps working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

A) 9	B) 10
C) 11	D) 12

Answer & Explanation Answer: D) 12

Explanation:

Let the required no of working hours per day be x.

More pumps , Less working hours per day (Indirect Proportion)

Less days, More working hours per day (Indirect Proportion)

$\begin{array}{r} \begin{matrix} P u m p s & 4 : 3 \end{matrix} \\ \begin{matrix} D a y s & 1 : 2 \end{matrix} \end{array}\} ⋮ ⋮ 8 : x$

=> (4 * 1 * x) = (3 * 2 * 8)

=> x=12

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Q:

If the Price of 6 toys is Rs. 264.37, What will be the approximate price of 5 toys?

A) Rs.120	B) Rs.100
C) Rs.200	D) Rs.220

Answer & Explanation Answer: D) Rs.220

Explanation:

Let the required Price be Rs. X .Then, Lest toys , Less cost (Direct Proportion)

Therefore 6 : 5 :: 264.37 : x

=> 6 * x = 5 * 264.37

=> X= 220.308

Therefore, Approximate price of 5 toys = Rs. 220

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Q:

The blue colour of the clear sky is due to

A) Diffraction of light	B) Dispersion of light
C) Reflection of light	D) Refraction of light

Answer & Explanation Answer: B) Dispersion of light

Explanation:

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Filed Under: General Science

Q:

Which one of the following types of laser is used in laser printers?

A) Semiconductor laser	B) Dye laser
C) Gas laser	D) Excimer laser

Answer & Explanation Answer: A) Semiconductor laser

Explanation:

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Q:

The power of a lens is measured in:

A) diopters	B) aeon
C) lumen	D) candela

Answer & Explanation Answer: A) diopters

Explanation:

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Filed Under: General Science

Q:

Special 3-D photographs which have been taken with laser beams (and which make the objects look real) are called what?

A) Holograms	B) 3D special effects
C) Portraits	D) DVD

Answer & Explanation Answer: A) Holograms

Explanation:

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Q:

The amount of water vapour in the air is called...?

A) snow	B) humidity
C) sunsafe factor	D) water cycle

Answer & Explanation Answer: B) humidity

Explanation:

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Q:

What invisible force holds you onto the earth, so that you don't simply fall off?

A) gravity	B) magnetism
C) wind	D) speed

Answer & Explanation Answer: A) gravity

Explanation:

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Filed Under: General Science

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