NTPC CBT-2 Chemistry Quiz

Question 1:

In hydrogen atom , it is observed that , on absorbing energy , value of n changes from n = 2 to n = 6. This means

Electron is going farther away from nucleus

Electron is coming near to nucleus

Electron is not moving

Electron is at infinity

Question 2:

The property which forms the basis of sieving-

Difference in weight

Difference in colour

Difference in shape

Difference in size

Question 3:

Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using

Aluminium as reducing agent

Sodium as reducing agent

Carbon as reducing agent

Magnesium as reducing agent

Question 4:

A good quality of water will have

High DO
High BOD
High COD

Only 1

Only 2

Both 2 and 3

Only 3

Question 5:

Which of the following model is similar to Christmas pudding?

Dalton atomic theory

Rutherford model of an atom

Thomson model of an atom

Bohr theory

Question 6:

The poisonous gases which contain chlorine are

Phosgene gas
Tear gas
Laughing gas
Chloropicrin gas

1, 2

1, 2, 4

3, 4

2, 3, 4

Question 7:

Chemical properties of lithium is similar to magnesium because

Both carry same charge

Both have nearly the same size

Both have similar electronic configuration

The ratio of their charge and size (i.e. charge density) is nearly the same

Question 8:

Why does a farmer put lime (calcium oxide) on the soil?

Act as a fertilizer

To kill pests

To make the soil less acidic

To make the soil less alkaline

Question 9:

Placing elements together in the groups or periods is essential as it helps in

Understanding the physical properties of elements

Understanding the chemical properties of elements

Both 1 and 2

Neither 1 nor 2

Question 10:

A very few alpha particles bounced back by 180⁰. This conclude that

The nucleus is very small
Nucleus is positively charged
Electrons are revolving around nucleus of an atom
Alpha particles are negatively charged

1,2

1,2,3

2,3,4

2,3

NTPC CBT-2 Chemistry Quiz - 14

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NTPC CBT-2 Chemistry Quiz - 14

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