# Exams

• #### TOEFL

Q:

Hydrogen bomb is based on the principle of

 A) nuclear fission B) nuclear fusion C) natural radioactivity D) artificial radioactivity

Explanation:

Hydrogen Bomb is based on the principle of Nuclear Fusion.

• Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.

• The difference in mass between the reactants and products is manifested as either the release or absorption of energy.

Filed Under: Chemistry
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381 66200
Q:

Tea worth of Rs. 135/kg & Rs. 126/kg are mixed with a third variety in the ratio 1: 1 : 2. If the mixture is worth Rs. 153 per kg, the price of the third variety per kg will be____?

 A) Rs. 169.50 B) Rs.1700 C) Rs. 175.50 D) Rs. 180

Explanation:

Since first second varieties are mixed in equal proportions, so their average price = Rs.(126+135)/2= Rs.130.50

So, Now the mixture is formed by mixing two varieties, one at Rs. 130.50 per kg and the other at say Rs. 'x' per kg in the ratio 2 : 2, i.e., 1 : 1. We have to find 'x'.

Cost of 1 kg tea of 1st kind         Cost of 1 kg tea of 2nd kind

x-153/22.50 = 1  => x - 153 = 22.50  => x=175.50.

Hence, price of the third variety = Rs.175.50 per kg.

451 64888
Q:

The working principle of a washing machine is

 A) reverse osmosis B) diffusion C) centrifugation D) dialysis

Explanation:

The working principle of a washing machine is centrifugation.

Centrifugation is a separation process which uses the action of centrifugal force to promote accelerated settling of particles in a solid-liquid mixture.

The washing machine consists of centrifuge for this purpose. A centrifuge is a piece of equipment that puts an object in rotation around a fixed axis, applying a force perpendicular to the axis of spin that can be very strong.

Filed Under: Physics
Exam Prep: GATE , CAT , Bank Exams , AIEEE
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382 63931
Q:

How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

 A) None B) One C) Two D) Three

Explanation:

Given Number:     4  2  1  5  7  9  3  6  8

Ascending order:  1  2  3  4  5  6  7  8  9

Hence the required pairs are  12, 49, 16

880 61639
Q:

MS-Word is an example of _____

 A) An operating system B) A processing device C) Application software D) An input device

Explanation:

Microsoft Word or MS-Word is an Application software developed by the company Microsoft. It allows users to Type and Save documents.

Filed Under: Computer
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325 61019
Q:

At what time between 4 and 5 o'clock will the hands of a watch point in opposite directions?

 A) 54 past 4 B) (53 + 7/11) past 4 C) (54 + 8/11) past 4 D) (54 + 6/11) past 4

Explanation:

4 o'clock, the hands of the watch are 20 min. spaces apart.
To be in opposite directions, they must be 30 min. spaces apart.
Minute hand will have to gain 50 min. spaces.
55 min. spaces are gained in 60 min

50 min. spaces are gained in $6055×50$ min. or $54611$

Required time = $54611$ min. past 4.

208 59433
Q:

If the diagonal of a rectangle is 17cm long and its perimeter is 46 cm. Find the area of the rectangle.

 A) 110 B) 120 C) 130 D) 140

Explanation:

let length = x and breadth = y then

2(x+y) = 46         =>   x+y = 23

x²+y² = 17² = 289

now (x+y)² = 23²

=> x²+y²+2xy= 529

=> 289+ 2xy = 529

=> xy = 120

area = xy = 120 sq.cm

208 59382
Q:

Epsom(England) is the place associated with

 A) Snooker B) Shooting C) Polo D) Horse racing

Explanation:

Epsom is a market town in Surrey, England, 22.0 km south-west of London.

Epsom Downs Racecourse holds The Derby, now a generic name for sports competitions in English-speaking countries. The town also gives its name to Epsom salts, extracted from mineral waters there.

Within the centuries-old boundaries is Epsom Downs Racecourse which features two of the five English Classic horse races; The Derby and The Oaks, which were first run in 1780 and 1779 respectively.