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COMBUSTION

Total questions: 58

Worksheet time: 34mins

Name
Class
Date
1.

Which substance give heat and light after combustion

a)

flame

b)

fuel

c)

combustion

d)

none of these

2.

The substances which have very low ignition temperature will

a)

catch fire easily

b)

will not catch fire

c)

catch fire after some time

d)

none of these

3.

ignition temperature is

a)

any temperature at which a substance catches fire

b)

highest temperature at which a substances catches fire

c)

lowest temperature at which a substance catches fire

4.

CNG and LPG are the examples of

a)

solid fuels

b)

liquid fuels

c)

gaseous fuels

d)

they aren't fuels

5.

the products of combustion are

a)

carbon dioxide

b)

oxygen & water

c)

water and fire

6.
Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?
a)
Water
b)
Carbon Dioxide 
c)
Dry Chemical
d)
Foam
7.
Wood is a better fuel than LPG.
a)
True
b)
False
8.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
9.
Which is not combustible substance
a)
Wood
b)
Cow dung cake
c)
stone
d)
paper
10.
In which form the colfloric value represent?
a)
(kJ/kg)
b)
gram
c)
kilogram 
d)
both 1 & 3
11.
What is produced when combustable substance is in the vapour state and burn strongly in the presence of of air?
a)
heat 
b)
light
c)
flame
d)
fumes
12.
The condition which are required for combustion to take place are:
a)
fuel
b)
ignition temperature
c)
oxygen
d)
all of these
13.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
14.

What is NOT product of complete combustion?

a)

carbon dioxide

b)

water

c)

carbon monoxide

d)

water

15.

If a flame is giving off smoke, this type of combustion is occurring...

a)

Complete combustion

b)

Incomplete combustion

16.

This type of combustion occurs when there is a limited supply of oxygen

a)

Complete Combustion

b)

Incomplete Combustion

17.

Which one of the following gases is used in combustion?

a)

Hydrogen

b)

Oxygen

c)

Nitrogen

d)

Carbon dioxide

18.

Which is non-combustible substance?

a)

Wood

b)

Paper

c)

Iron nails

d)

Straw

19.

Which zone of a flame does a goldsmith use for melting gold and silver ?

a)

Outer zone

b)

Middle zone

c)

Inner zone

d)

Lower zone

20.

Substances which catch fire are called

a)

acids

b)

bases

c)

combustible

d)

burners

21.

Which of the following is not a fossil fuel?

a)

Coal

b)

Petroleum

c)

Natural gas

d)

Water gas

22.

A temperature at which the substance starts burns is called

a)

melting

b)

boiling temperature

c)

ignition temperature

d)

evaporation

23.

If 150g of fuel is burned the energy produced is 45,000J then find the calorific value of the fuel .

a)

3,00,000Kj

b)

2,30,000Kj

c)

30,000Kj

d)

4,50,000Kj

24.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
25.
Is combustion a reversible reaction?
a)
Yes.
b)
No.
26.
What are the types of combustion?
a)
Complete & incomplete
b)
Incomplete & inexact
c)
Impossible & complete
d)
Computer & incompete
27.
A good fuel burns neither too fast nor too slowly.
a)
True
b)
False
28.
Complete combustion is when there is plenty of oxygen to react with. 
a)
True
b)
False
29.
Incomplete combustion is when there is a limited amount of oxygen.
a)
True
b)
False
30.
What is carbon monoxide?
a)
A toxic gas
b)
A large solid
31.

Identify the luminous zone in the given picture

a)

A

b)

C

c)

B

d)

None

32.

Burning of LPG is an example of

a)

Spontaneous

b)

Rapid

c)

Explosion

d)

None

33.

The amount of heat produced on burning one kilogram of fuel completely is called its (a)   '

34.

When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?

a)

Explosion

b)

Random combustion

c)

Rapid combustion

d)

Spontaneous combustion

35.

Which is the hottest part in the flame of the candle

a)

Yellow

b)

Wax part

c)

Black

d)

Blue

36.

Good fuel is

a)

Readily available

b)

Cheap

c)

Burn easily in air

d)

All of these

37.

The least hot zone of a candle flame is

a)

non-lumious zone

b)

luminous

c)

dark zone

d)

blue zone at the base of the wick

38.
what is the type of combustion 
which occurs rapidly and produce heat and light?
a)
rapid combustion
b)
spontaneous combustion
c)
fast combustion
d)
explosion
39.

Fire is extinguished by

a)

removing all combustible substance

b)

cutting off supply of air

c)

cooling the burning substance

d)

all the these

40.
Which of the statements is true?
a)
The bottom of the boot exerts more pressure than the shoe as a result of an increase in surface area.
b)
The bottom of the shoe exerts more pressure than the boot as a result of an decrease in surface area.
c)
The bottom of the shoe exerts the same pressure as the bottom of the boot.
41.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
42.
What is the equation used to calculate pressure?
a)
pressure= force/mass
b)
pressure =mass/volume
c)
pressure=area/force
d)
pressure=force/area
43.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
44.
Which of these animals would probably cause the greatest pressure on the ground?
a)
A fat cow with big feet
b)
A fat cow with small feet
c)
 A calf with big feet
d)
A calf with small feet
45.
Look at the pressure triangle. How do we calculate the area?
a)
f ÷ a
b)
f x p
c)
p x f
d)
f ÷ p
46.
Look at the pressure triangle. How do we calculate the force?
a)
f ÷ a
b)
f x p
c)
p x a
d)
f ÷ p
47.
Pressure can be measured in Pascales (Pa) or Newtons per square metre.
1 Pa = 1N/m2
a)
True
b)
False
48.
What does pressure measure?
a)
Strength
b)
Force exerted on a given area of surface
49.
Fluids can also include__ and__. 
a)
solids and liquids
b)
solids and gases
c)
liquids and gases
d)
liquids
50.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
51.
What is the instrument that measures air pressure called?
a)
Graduated cylinder
b)
Barometer
c)
Force scale
d)
Anemometer
52.
The amount of force pushing on an area is the definition of....
a)
Fluid
b)
Viscosity
c)
Barometer
d)
Pressure
53.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
54.
Army tank tracks are useful for travelling through the mud because..
a)
they decrease the force the vehicle exerts on the ground
b)
they increase the force the vehicle exerts on the ground
c)
they decrease the pressure the vehicle exerts on the ground
d)
they increase the pressure the vehicle exerts on the ground
55.
Where is pressure the greatest on the dam?
a)
D
b)
C
c)
B
d)
A
56.
The pressure resulting from a force of 50 N exerted over an area of 5 m2 is
a)
10 N
b)
0.1 N
c)
10 N/m2
d)
0.1 Pa
57.

A rocket has been fired upwards to launch a satellite in its Orbit name the forces acting downwards on the rocket immediately after leaving the launching pad

a)

Propelling force of gases emitted by combustion of fuel

b)

magnetic force of Earth

c)

gravitational force of Earth

d)

no force acting downwards

58.

Which type of force is force of gravity

a)

contact force and attraction

b)

non contact force and attraction

c)

contact force and repulsive

d)

Non contact force and repulsive

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