The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then

A

$${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months

B

It will completely disintegrate in two months

C

It will completely disintegrate in four months

D

$${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months

The variety of coal in which the deposit contains recognizable traces of the original plant material is

A

Bitumen

B

Anthracite

C

Lignite

D

Peat

When water itself combines chemically with some element or mineral it is called

A

Carbonation

B

Desilication

C

Hydration

D

Oxidation

If no multivalued attributes exist and no partial dependencies exist in a relation, then the relation is in what normal form?

A

First normal form

B

Second normal form

C

Third normal form

D

Fourth normal form

In each of the questions 20-21 , there are two quantities : Quantity A and Quantity B. You are to compare those quantities . Quantities A 5 (a-7) Quantity B 5a - 7

A

Quantity A is greater

B

Quantity B is greater

C

Both quantities are equal

D

It is impossible to determine

A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to 8 times itself?

A

12 years

B

8 years

C

16 years

D

64 years

Chemically, marble is known as

A

Metamorphic rock

B

Argillaceous rock

C

Calcareous rock

D

Siliceous rock

Neoprene is chemically known as

A

Polybutandiene

B

Styrene butadiene rubber (SBR)

C

Polyurethane

D

Poly chloroprene

Chemically ‘Quick Silver' is known as

A

Mercury

B

Silver

C

Aluminium

D

Copper

Aspirin is chemically known as

A

Methyl salicylate

B

Hydroxysalicylate

C

Acetylsalicylic acid

D

Alkylsalicylic acid

The smallest quantity of a substance, which can exist by itself in a chemically recognizable form is known as

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