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Q:

In the structure of planet Earth ,below the mantle, the core is mainly made up of which one of the following

A) Aluminium	B) Chrromium
C) Iron	D) Silicon

Answer & Explanation Answer: C) Iron

Explanation:

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Q:

Which is the second most abundant metal in the earth's crust

A) Iron	B) Aluminum
C) Copper	D) Zinc

Answer & Explanation Answer: B) Aluminum

Explanation:

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Q:

An instrusion of magma along a bedding plane is called a

A) Dyke	B) Still
C) Batholith	D) Laccolith

Answer & Explanation Answer: C) Batholith

Explanation:

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Q:

The most abundent metal in the Earth's crust is

A) Calcium	B) Aluminium
C) Iron	D) Magnesium

Answer & Explanation Answer: B) Aluminium

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Q:

Which of the following is present in the largest amount in terms of percent by mass in the earth's crust

A) Silicon	B) Oxygen
C) Carbon	D) Calcium

Answer & Explanation Answer: B) Oxygen

Explanation:

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Q:

If $3 x + 7 = x^{2} + p = 7 x + 5$ , what is the value of P ?

A) 17/2	B) 25/3
C) 33/4	D) 41/5

Answer & Explanation Answer: A) 17/2

Explanation:

$3 x + 7 = 7 x + 5 = > 7 x - 3 x = 2 = > 4 x = 2 = > x = 2$

Now, $3 x + 7 = x^{2} + p = \frac{3}{2} + 7 = \frac{1}{4} + p = > p = \frac{17}{2}$

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Filed Under: Simplification

Q:

If 2 tables and 3 chairs cost Rs, 3500 and 3 tables and 2 chairs cost Rs. 4000, then how much does a table cost ?

A) 500	B) 1000
C) 1500	D) 2000

Answer & Explanation Answer: B) 1000

Explanation:

Let the cost of a table and that of a chair be Rs. x and Rs, y respectively.

Then, 2x + 3y = 3500 ...(i)

and 3x + 2y = 4000 .....(ii)

solving (i) and (ii) we get x = 1000, y = 500

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Q:

Which of the following layers of the earth is believed to have the heavist mineral materials of highest density

A) Central core	B) Crust
C) Mantle	D) Both (B) and (C)

Answer & Explanation Answer: A) Central core

Explanation:

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