Q:

Permanent hardness of water is due to the presence of ?

A) Calcium sulphate	B) Calcium bicarbonate
C) Sodium bicarbonate	D) Magnesium bicarbonate

Answer & Explanation Answer: A) Calcium sulphate

Explanation:

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Q:

Which of the following is a radioactive element

A) Sulphur	B) Polonium
C) Tellurium	D) Selenium

Answer & Explanation Answer: B) Polonium

Explanation:

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Q:

Plants having body that is differentiated into roots, stems and leaves and have specialized tissue for the conduction of water and other substances, fall in which group?

A) Bryophyta	B) Thallophyta
C) Pteridophyta	D) All option are correct

Answer & Explanation Answer: C) Pteridophyta

Explanation:

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Q:

Who was the first Indian batsman to have achieved 300 runs in an innings in tests

A) Sachin Tendulkar	B) Sourav Ganguly
C) Bishen Singh Bedi	D) Virender Sehwag

Answer & Explanation Answer: D) Virender Sehwag

Explanation:

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Q:

Seawater (i.e. saltwater) freezes at:

A) at a slightly higher temperature than fresh water	B) at a slightly lower temperature than fresh water.
C) the same temperature as fresh water.	D) seawater does not freeze.

Answer & Explanation Answer: B) at a slightly lower temperature than fresh water.

Explanation:

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Q:

The Information Security Policy should be available to which groups of people?

A) Senior business managers and all IT staff	B) Information Security Management staff only
C) All customers, users and IT staff	D) Senior business managers, IT executives and the Security Manager

Answer & Explanation Answer: C) All customers, users and IT staff

Explanation:

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Q:

The oxidation number of Cr in $K_{2} {Cr}_{2} O_{7}$ is

A) +6	B) -5
C) +3	D) -4

Answer & Explanation Answer: A) +6

Explanation:

We will rewrite the formula as an equation.

2K + 2Cr + 7O = 0

The zero comes from there being no overall charge on the compound.

Each oxidation number is represented by the element's symbol.

Since this compound is not a peroxide or superoxide, the oxidation value for O is -2

K being in group 1 has a +1 charge and therefore has an oxidation number of K is +1

Now, by putting known values in we have:

2(+1) + 2(Cr) + 7(-2) = 0

2 + 2Cr -14 = 0

2Cr = +12

Cr = +6.

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Q:

Humayun Nama was written during the reign of Emperor Akbar's reign, both Hindi and persian,belongs to

A) Gulbadan Begum	B) Ahmad Yadgar
C) Abbas Sarwani	D) Faizi Sarhindi

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