Which of the following is always found In free stable in nature ?

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Which of the following is always found In free stable in nature ?

AGold

BSilver

CSodium

DCopper

Nithin K ? Apr 21 '2018 at 20:6

Correct Answer: A [Gold]

Explanation:

Gold is chemically very less active and hence found in free state in nature.

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Which of the following is acidic In nature ?

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Which of the following is acidic In nature ?

ASugar

BLime

CBaking Powder

DVlnegar

Nithin K ? Apr 21 '2018 at 18:39

Correct Answer: D [Vlnegar]

Explanation:

Vinegar is chemically : 4-8% Acetic Acid CH₃COOH and hence it is acidic in nature.

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The logarithm of 0.0625 to the 2 is

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The logarithm of 0.0625 to the 2 is

A-4

B-2

C0.25

D0.5

Nithin K ? Apr 21 '2018 at 18:16

Correct Answer: A [-4]

Explanation:

\(log_{2}0.0625=log_{2}\Big(\frac{625}{10000}\Big)\)

\(=log_{2}\Big(\frac{1}{16}\Big)\)

\( =log_{2}{1} - log_{2}16\)

\(=-log_{2}16\)

\(= - \text{ log}_{2}2^4\)

\(=-4\text{ log}_{2}2\)

=-4

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180 15 12 20

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$$\frac{180 \times 15- 12 \times 20}{ 140 \times 8 + 2 \times 55} = ?$$

A\frac{1}{7}

B\frac{4}{5}

C2

D4

Nithin K ? Apr 21 '2018 at 17:46

Correct Answer: C [2]

Explanation:

\(\frac{180 \times 15 - 12 \times 20}{140 \times 8 + 2 \times 55}\)

\(=\frac{20 \times 3 [9 \times 5-4]}{10[14 \times 8 +1]}\)

\(=\frac{6 \times 41}{112+11}\implies \frac{6 \times 41}{123}\)

\(=6 \times \frac{1}{3}\)

\(=2\)

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The gas used to extinguish fire, is

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The gas used to extinguish fire, is

ANeon

B Nitrogen

C Carbon dioxide

DCarbon monoxide

Nithin K ? Apr 21 '2018 at 16:30

Correct Answer: C [Carbon dioxide]

Explanation:

carbon dioxide Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire. That is, the gas drives oxygen away from the fire, thus stopping the chemical reaction.

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Which of the following law not relate to gases?

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Which of the following law not relate to gases?

ABoyle’s law

BCharles law

CGay-Lussac’s law

DFaraday’s law

Nithin K ? Apr 21 '2018 at 16:26

Correct Answer: D [Faraday’s law]

Explanation:

Faraday's laws deals with electrolysis  and not with gases.

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A does a work in 10 days and b does the same work In 15 days In how many days they together will do the same work?

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A does a work in 10 days and b does the same work In 15 days In how many days they together will do the same work?

A5 days

B6 days

C8 days

D10 days

Nithin K ? Apr 21 '2018 at 16:18

Corrct Answer: B [6 days]

Explanation:

\(\text{A's one day work =}\frac{1}{10}\)

\(\text{B's one day work = }\frac{1}{15}\)

\(\text{(A+B)'s one day's work }\)

\(=\frac{1}{10} + \frac{1}{15}\)

\(=\frac{3+2}{30}\)

\(=\frac{1}{6}\)

\(\therefore \text{A and B together work in 6 days. }\)

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