Fill in the blanks:

(a) Burning of wood and coal causes _ of air.

(b) A liquid fuel used in homes is _.

(c) Fuel must be heated to its _ before it starts burning.

(d) Fire produced by oil cannot be controlled by ____ _.

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Solution

(a) Burning of wood and coal causes pollution of air.

(b) A liquid fuel used in homes is __liquefied petroleum gas (LPG)_.

(c) Fuel must be heated to its ignition temperature before it starts burning.

(d) Fire produced by oil cannot be controlled by water.

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Similar questions

Fill in the blanks:

(a) Burning of wood and coal causes _______ __ of air.

(b) A liquid fuel used in homes is ___________.

(d) Fire produced by oil cannot be controlled by ________ _.

Fill in the following blanks with suitable words :

(a) A fuel must be heated to its___ before it starts burning.

(b) The most common supporter of combustion around us is___

(d) A liquid fuel used in homes is___

(e) The amount of heat evolved when 1 kg of a fuel is burnt completely is called its___

(f) The substances which vaporise during burning, give___

(g) Burning of wood and coal causes___ of air.

Q. Which of the following is not a criterion for a good fuel?
(a) The burning of the fuel should release heat in a controlled manner.
(b) The fuel should be easy to store and transport.
(c) The fuel should not pollute the air by emanating harmful gases.
(d) The fuel should have low calorific value.

Fill in the following blank with a suitable word:
The amount of heat produced by burning a unit mass of a fuel completely is known as its ................ value.

Q. A hard material X which is mined from the earth is used as a house hold fuel and also for the generation of electricity at Thermal Power Stations. A soft material Y is also used us a fuel in the form of candles. A gaseous material Z which occurs along with petroleum is increasingly being used as a fuel in running vehicles in its compressed form.

(a) What are materials, X, Y and Z?
(b) When materials X, Y and Z are burned separately:
(i) Which material burns by producing a yellow, luminous flame?
(ii) Which material ultimately burns without producing a flame?
(iii) Which material can burn in a gas stove by producing a blue flame?

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Fill in the blanks: (a) Burning of wood and coal causes _______ __ of air. (b) A liquid fuel used in homes is ___________. (c) Fuel must be heated to its ___________ before it starts burning. (d) Fire produced by oil cannot be controlled by ________ _.

(a) Burning of wood and coal causes __pollution__ of air. (b) A liquid fuel used in homes is __liquefied petroleum gas (LPG)_. (c) Fuel must be heated to its __ignition temperature__ before it starts burning. (d) Fire produced by oil cannot be controlled by __water__.

Fill in the blanks:

(a) Burning of wood and coal causes _ of air.

(b) A liquid fuel used in homes is _.

(c) Fuel must be heated to its _ before it starts burning.

(d) Fire produced by oil cannot be controlled by ____ _.

(a) Burning of wood and coal causes pollution of air.

(b) A liquid fuel used in homes is __liquefied petroleum gas (LPG)_.

(c) Fuel must be heated to its ignition temperature before it starts burning.

(d) Fire produced by oil cannot be controlled by water.