Question : Water is not effective in extinguish a fire cause by petrol because
Option 1: The flame is too hot for water to cool it down
Option 2: Water and petrol react chemically
Option 3: Water and petrol are miscible with each other
Option 4: Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Correct Answer: Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Solution : The correct option is Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn.
Because petrol is lighter than water, water is ineffective in extinguishing a fire caused by petrol. When water is put on a petrol fire, the petrol will float to the surface and continue to burn. The water will also vaporise and produce steam, which will help to spread the fire. Furthermore, water may worsen a petrol fire. This is due to the fact that water may cool the fuel, causing it to vaporise faster. The vaporised fuel can then combine with the air to form an explosive combination. The best technique to put out a petrol fire is to use a fire extinguisher made primarily for petrol fires. These fire extinguishers contain foam or powder that smothers the flames and prevents it from spreading.
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Question : Water is used in a hot water bag because:
Option 1: it is easily available
Option 2: it has high specific gravity
Option 3: it has high specific heat
Option 4: it is a liquid substance
Question : Which of the followinf is FALSE with respect to rain water harvesting ?
Option 1: It is a device of water conservation
Option 2: It helps in raising water table
Option 3: It helps in meeting rising water demands
Option 4: It increases run off losses
Question : Select the option that expresses the given sentence in passive voice.
The sewage water smells foul.
Option 1: Foul is smelt by the sewage water.
Option 2: The sewage water is foul when it is smelt.
Option 3: The sewage water has a foul smell.
Option 4: Passive construction is not possible.
Question : Comprehension: In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. A great fire (1)______ in London in 1666, which (2)____ the city and made around 1,00,000 people homeless. This fire is said to have begun in a pudding lane. It (3)____ through the crowded streets and wooden houses. However, after the fire, London was (4)___ with wider streets and improved water supplies. New buildings were (5)___ using bricks instead of wood. Question: Select the most appropriate option to fill in the blank no. 3.
Option 1: glided
Option 2: carried
Option 3: swept
Option 4: pulled
Question : Comprehension: In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank. A great fire (1)______ in London in 1666, which (2)____ the city and made around 1,00,000 people homeless. This fire is said to have begun in a pudding lane. It (3)____ through the crowded streets and wooden houses. However, after the fire, London was (4)___ with wider streets and improved water supplies. New buildings were (5)___ using bricks instead of wood. Question: Select the most appropriate option to fill in the blank no. 2.
Option 1: destroyed
Option 2: smashed
Option 3: shattered
Option 4: demolished
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