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MOCK TEST - UNIT I,II &III

Total questions: 60

Worksheet time: 41mins

Name
Class
Date
1.

Hardness in water is caused by the presence of:

a)

Sodium chloride

b)

Sodium carbonate

c)

Calcium chloride

d)

Potassium nitrate

2.
If water contains calcium and hydrogen carbonate ions, it is described as....
a)
temporarily permanently soft water
b)
Soft water
c)
Permanently hard water
d)
Temporary hard water
3.

Scale formation in boilers causes

a)

no loss of heat

b)

wastage of heat

c)

increase in efficiency

d)

none of the above

4.

Hard water is unfit for use in boilers for “steam raising” because

a)

its boiling point is higher

b)

steam generated at a high pressure

c)

it leads to scale formation inside the boiler

d)

water undergoes decomposition in to oxygen and hydrogen.

5.

What is the function of a boiler?

a)

to heat water to make steam

b)

to heat water to make spaghetti

c)

to transform liquid into a mist

d)

to mix air and fuel

6.

boiler water having high alkalinity could develop ___

a)

acidic corrosion

b)

oxygen pitting

c)

caustic embrittlement

d)

warping

7.

Water treatment process (seawater desalination) is opposite to natural osmosis is

a)

Reverse Osmosis

b)

Ultrafiltration

c)

Nanofiltration

d)

Microfiltration

8.

Min pressure to be applied to prevent the water flow through semipermeable membrane

a)

Hydraulic pressure

b)

Reverse pressure

c)

Osmotic pressure

d)

Membrane pressure

9.

Osmosis - water movement through semi permeable membrane

a)

True

b)

False

10.

What is the first step in the water treatment process?

a)

coagulation

b)

filtration and removal of debris, sand, grit, etc.

c)

flocs

d)

concentation

11.
What gas must be maintained at precise levels in the aeration tank?
a)
CO2
b)
O2
c)
H2
d)
CO
12.
What does chlorination do to the water?
a)
Removes microorganisms
b)
Cleans the water
c)
Makes the water taste nice
d)
Removes twigs and sediment
13.
People must have _______ to drink in order to survive.
a)
frozen water
b)
clean water
c)
contaminated water
d)
polluted water
14.

What is the best way to purify water?

a)

Add salt

b)

Put inside the refrigerator

c)

Filtration or Boiling

d)

Find a very clean stream of water

15.

what is added during coagulation process in water treatment plant

a)

alum and slaked lime

b)

florida

c)

chlorine

d)

calcium carbonate

16.

Large molecules made up of small monomers are called

a)

polymers

b)

peptides

c)

peptones

d)

monomers

17.

Once formed, it can be heated and reformed over and over again

a)

thermoset

b)

thermoplastic

c)

elastomer

d)

kevlar

18.
Proteins are composed of what smaller subunits?
a)
amino acids
b)
nucleic acids
c)
fatty acids
d)
nucleotides
19.

What is the name of the reaction used to make polymers?

a)

polymerization

b)

cracking

c)

polygonization

d)

precipitation

20.

1,6-hexadiamine and hexanedioic acid are the monomers for

a)

kevlar

b)

nylon 6,6

c)

nylon 6

d)

terylene

21.

The chain growth process is usually much slower than the condensation process.

a)

True

b)

False

22.

Which of the following reaction is not accompanied by elimination of a byproduct molecule?

a)

addition polymerization

b)

condensation polymerization

c)

both of the mentioned

d)

none of the mentioned

23.
WHAT IS PLASTIC?
a)
Plastics are typically organic polymers of high molecular mass
b)
IS GLASS
c)
IS A KIND OF CHEMYCAL MATERIAL
d)
Materials that can be reshaped (remolded) by applying heat and pressure
24.
Why do you think people use plastic for their products ?
a)
Because it's strong
b)
Because its very cheap and it's easy to make
c)
Because it's expensive
d)
Because it's rare and it's good for the enviorment
25.

Identify the type of plastic that can best be used to make electrical switches.

a)

PVC

b)

Polythene

c)

PET

d)

Bakelite

26.

Select the correct option from the given statements.

a)

Polymers cannot form fibres

b)

Polymers can be both natural and synthetic

c)

Polymer is a natural substance

d)

Polymer is a synthetic substance

27.

What are the 2 types of Polymers?

a)

Thermosetting Plastics

b)

Thermochromic Plastics

c)

Thermoplastics

d)

Thermopolymers

28.

All plastics are man made and do not biodegrade.

a)

True

b)

False

29.

Polythene and PVC are examples of

a)

Bio degradable substance

b)

Thermosetting plastics

c)

Thermoplastics

d)

Rayon

30.

The process of heating and compressing the preform material in to the mould is ___________.

a)

Blow moulding

b)

Transfer moulding

c)

Injection moulding

d)

Compression moulding

31.

In compression moulds, polymerization of plastic takes place in _____________.

a)

machine

b)

mould

c)

material

d)

hopper

32.

Match the parts of the the diagram.

a)

The screw rotates.

b)

The polymer pellets are transferred from the hopper to the cylinder.

c)

The plastic bottle is ejected.

d)

The molten polymer is extruded into the mould.

33.

Match the parts of the diagram.

a)

The two halves of the mould are closed with the molten polymer inside.

b)

The polymer is expanded to fit the shape of the mould.

c)

The molten polymer is extruded into the mould.

d)

The molten polymer is inflated by the compressed air.

34.

Electrons always flow from

a)

cathode to anode

b)

anode to cathode

35.

Oxidation occurs at the

a)

anode

b)

cathode

36.

What is a cathode?

a)

It is the electrode where oxidation takes place.

b)

It is the electrode where reduction takes place.

c)

It is an aqueous solution containing an electrode.

d)

It is the salt bridge that connects half-cells.

37.

Galvanic cells convert

a)

mechanical energy in to electrical energy

b)

potential energy in to electrical energy

c)

electrical energy in to chemical energy

d)

chemical energy in to electrical energy

38.
Iron rust in the presence of:
a)
Vacuum
b)
Moisture
c)
Oxygen
d)
Moisture and Oxygen
39.
Is this an example of corrosion?
a)
Yes
b)
No
40.

Name the two general classifications of corrosion.

a)

Direct chemical attack and Electrochemical attack.

b)

Fretting corrosion and Galvanic attack.

41.

two types of Noble metals

a)

gold and platinum

b)

iron and copper

c)

stainless steel and aluminum

d)

tin and brass

42.

Define metal corrosion.

a)

Deterioration of metal by chemical or electrochemical attack that can occur internally & externally.

b)

Changes smooth surface.

c)

weakens interior, damages and/or loosens adjacent parts.

d)

All are correct.

43.

This is an example of

a)

Differential Metalation Corrosion

b)

Differential Aeration Corrosion

44.

Which of the following metals is not attacked by the environment?

a)
b)
c)
d)
45.

Rusting can be prevented by

a)

Alloying

b)

Tinning

c)

Galvanizing

d)

All of above

46.

What is the chemical name given to Rust ?

a)

Iron dioxide

b)

Steel oxide

c)

Iron oxide

d)

Carbon dioxide

47.
Which of the following metals is very unreactive and unlikely to corrode. 
a)
Copper
b)
Gold
c)
sodium
d)
Potassium
48.
Which of the following is NOT a harmful effect of corrosion?
a)
Bad appearance
b)
Maintenance cost
c)
Clean product
d)
Plant shutdown
49.
To protect iron against corrosion, the most durable metal plating on it, is:
a)
Zinc plating
b)
Nickel plating
50.

Which of the following reaction will occur during rusting?

I) Fe --> Fe2+ + 2e-

II) 2H2O + O2 + 4e- ---> 4OH-

III) Fe --> Fe3+ + 3e-

a)

I and II only

b)

II and III only

c)

I , II and III

51.

Underground pipes are protected by

a)

Using antirust solutions

b)

Cathodic protection

c)

Using paints

d)

Alloying with other elemts

52.

Choose the WRONG statement

a)

Dry corrosion occurs in the absence of moisture

b)

Wet corrosion involves the formation of electrochemical cell

c)

Wet corrossion is a slow process

d)

The process of dry corrosion is uniform

53.

An example for sacrificial protection is

a)

Coating with tin (Sn) metal

b)

Coating with paint

c)

Coating iron with a thin layer of zinc or magnesium

d)

Alloying with other elements

54.

Smaller the Ratio of Anodic to Cathodic area

a)

Faster will be the rate of Corrosion

b)

Slower will be the rate of Corrosion

55.

What is corrosion of iron known as?

a)

Rancidity

b)

Fermentation

c)

Rusting

d)

Tarnishing

56.

A wooden chair will be affected by corrosion.

a)

True

b)

False

57.

When a vessel is exposed to moist air, it forms green coating on the surface. The vessel must be made of:

a)

Zinc

b)

Copper

c)

Magnesium

d)

Iron

58.

Which of the following is NOT a method to prevent corrosion?

a)

Electroplating

b)

Crystallization

c)

Alloying

d)

Galvanization

59.

What prevents Rusting

a)

Painting , Oiling , Galvinising

b)

Washing with water

60.
How are metal oxides formed?
a)
When metals react with oxide.
b)
When metals react with water.
c)
When metals react with air.
d)
When metals react with oxygen.

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