Question # 1

Two alloys contain zinc and copper in the ratio of 2 : 1 and 4 : 1. In what ratio the two alloys should be added together to get as a new alloy having zinc and copper in the ratio of 3 : 1 ?

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7 : 5

5 : 7

3 : 5

None of these

The population of a town has increased from 133575 to 138918. The per cent increase in population is

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2.5

3

3.5

4

Artifical selection was practiced by the

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Arabs

Chines

Romans

None of these

If 70% of students in a school are boys and the number of girls is 504, the number of boys is:

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1680

1176

1276

None of these

Bronze modal is made up of metal:

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copper.zinc

copper,nickel

Copper,tin

Sopper, Silver

86.04/4000 is equal to:

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.10215

.02151

.15201

.21015

Fuel used in a Fast Breeder Reactor is:

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Uranium oxide

Uranium plutonium carbide

Uranium thorium oxide

Uranium plutonium oxide

If 5^x+3 = (25)^3x-4, then the value of x is:

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5/11

11/5

11/3

13/5

What is the difference between the largest and the smallest fractions 5/8, 21/35, 9/16 and 6/7 ?

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33/112

11/37

13/41

9/35

How many numbers are in the region labeled x ?

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4

5

6

7

8

Dry ice is

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Methane hydrate

Liquid nitrogen

Solid Carbon dioxide

Frozen water

If 5a + 3b/2a-3b = 23/5, then the value of a : b is

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2 : 1

1 : 4

1 : 2

4 : 1

When a ray of of sunlight enters a dark room, its straight path become visible because of dust particles hanging in the air, it is because light is;

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Visible

Transparent

Invisible

Opaque

The three elements needed for healthy growth of plants are:

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N,P,K

N,C,P

N,K

N,S,P

The severity of 2005 earthquake in Pakistan on Richter scale was

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6.9

7.6

7.1

None of these

The sum of the interior angels of a polygon is twice the sum of its exterior angles. how many sides does the polygon have?

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8 sides

9 sides

12 sides

6 slides

When sound is reflected from floor,ceiling or a wall,it mixes with the original sound and change its complexion,it is called as

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Sound

Echo

Reverberation

Noise

Humming bird belong to a category called:

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Ectotherm

Endotherm

Exotherm

Hetrotherm

In winter an iron pipe feel colder than a wooden window. this is because wood is:

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Conductor

Non conductor

Semi conductor

Not a solid while iron is a solid

A number is increased by 20% and then decreased by 20%, the final value of the number

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Does not change

Decrease by 2%

Increases by 4%

Decreases by 4%

Express 7/8 as percentage.

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67 1/2 %

87 1/2 %

97 1/2 %

None of these

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