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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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Filed Under: Chain Rule

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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Filed Under: General Science

Q:

'Pencillin' which is used as an antibiotic is obtained from

A) Bacteria	B) Fungi
C) Algae	D) Lichens

Answer & Explanation Answer: B) Fungi

Explanation:

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Filed Under: General Science

Q:

Potassium Permanganate is used for purifying drinking water, because

A) it is a sterilising agent	B) it dissolves the impurities of water
C) it is a reducing agent	D) it is an oxidising agent

Answer & Explanation Answer: D) it is an oxidising agent

Explanation:

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Filed Under: General Science

Q:

In fireworks, the green flame is produced because of

A) Sodium	B) Potassium
C) Barium	D) Mercury

Answer & Explanation Answer: C) Barium

Explanation:

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Filed Under: General Science

Q:

The gases used in different types of welding would include

A) oxygen and hydrogen	B) oxygen and acetylene
C) oxygen, acetylene and argon	D) oxygen, hydrogen, acetylene and nitrogen

Answer & Explanation Answer: B) oxygen and acetylene

Explanation:

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Filed Under: General Science

Q:

Which of the following is used in pencils?

A) Silicon	B) Phosphorous
C) Graphite	D) Charcoal

Answer & Explanation Answer: C) Graphite

Explanation:

A pencil is an implement for writing or drawing. It is a thin core of graphite well mixed with clay, inside a wooden body as protective casing that prevents the core from being broken.

Which_of_the_following_is_used_in_pencils1558506948.jpg image

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Filed Under: General Science
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Q:

Den Bosch and Eastbourne are two famous cities 300 km apart. Maradona starts from Den Bosch at 8:24 am . An hour later pele starts from Den Bosch. After travelling for 1 hour , Pele reaches Nottingham that Maradona had passed 40 minutes earlier. Nottingham falls on the way from Den Bosch to Eastbourne. If pele and Maradona just reaches Eastbourne at the same time, what are thespeeds of the Maradona and Pele Respectively?

A) 100 km/h , 125 km/h	B) 60 km/h , 80 km/h
C) 60 km/h , 75 km/h	D) 75 km/h , 100 km/h

Answer & Explanation Answer: D) 75 km/h , 100 km/h

Explanation:

Let Pele x km in 1 hour. so Maradona takes (2h-40min)=1 h 20 min to cover x km. Let speed of Maradona and Pele be M and P respectively than

x =M x (4/3) and x= P x 1

=> M/P = 3/4

Again $\frac{300}{M} = \frac{300}{P} = 1$

$\Rightarrow \frac{300}{3 k} - \frac{300}{4 k} = 1$

=> k= 25

M= 3k = 75 km/h and P= 4k = 100 km/h

( Through options it is very easy to solve)

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Filed Under: Time and Distance

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