Which gas is used to extinguish fire?

A. Nitrous Oxide
B. Methane
C. Carbon Dioxide
D. Carbon Dioxide & Nitrous Oxide

Submitted by: Rizwan Ahmed Panhwar

Carbon dioxide (CO2) is used in some hand-held extinguishers and in fixed systems to displace oxygen and smother the fire. CO2 is used in some dry chemical (powder) hand-held and wheeled extinguishers as a propellant to expel the agent (dry chemical) which, through a chemical reaction, extinguishes the fire.

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Water is heated in a kettlE. The inside water is heated by convection. A person sitting near the fire receives heat by ________?
A. Conduction
B. Convection
C. Radiation
D. Reflection
E. None of these
Which ocean is called “Ring of Fire”?
A. Indian Ocean
B. Pacific Ocean
C. Atlantic Ocean
D. Antarctic Ocean
Submitted by: Bilawal Tunio
The gas, commonly known as “laughing gas”, is
A. Carbon Dioxide
B. Sulfur Dioxide
C. Nitrous Oxide
D. Sodium Oxide
Which of the gas is not known as green house gas?
A. Methane
B. Nitrous oxide
C. Carbon dioxide
D. Hydrogen
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As comets get close to the sun, they start to “melt” and release gas and dust. This gas and dust forms what?
A. “coma” around the comet’s nucleus and a long tail that points away from the sun
B. “coma” that points away from the sun and a long tail around the comet’s nucleus
C. Only “coma” around the comet’s nucleus
D. Only a long tail that points away from the sun
Submitted by: Muhammad Abdullah
Which gas was discovered on the sun about 151 years ago during total solar eclipse?
A. Hydrogen
B. Helium
C. Nitrogen
D. Flourine
Submitted by: Kashif Ashraf
Which of the following is the most toxic gas?
A. Carbon dioxide
B. Carbon monoxide
C. Nitrogen
D. Hydrogen
Submitted by: ABDUL HAYEE
What is the name of the gas used in an air conditioner?
A. Ammonia
B. Nitrous oxide
C. Freon
D. CO2
Submitted by: waqas shah
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?
A. Argon
B. Xenon
C. Helium
D. Krypton
Submitted by: Rashid Mehmood
In the human body, the lungs remove which gas from the blood?
A. Nitrogen
B. Hydrogen
C. Carbon Dioxide
D. Argon
Submitted by: Kashif Ali Gaad