- Q1: What physical quantity is defined as force per unit area?
Answer: Pressure
Explanation: Pressure is calculated by dividing the force applied by the area on which it is applied. - Q2: What happens to pressure when the same force is applied on a smaller area?
Answer: Increases
Explanation: Pressure increases when area decreases, because pressure is inversely proportional to area. - Q3: Which part of a knife is made sharp to increase pressure?
Answer: Edge
Explanation: A sharp edge has less area, so it exerts more pressure and cuts easily. - Q4: What is the SI unit of pressure?
Answer: Pascal
Explanation: Pressure is measured in pascals (Pa), where 1 pascal = 1 newton per square meter. - Q5: What force does a liquid or gas exert on the walls of a container?
Answer: Pressure
Explanation: Fluids exert pressure on all surfaces in contact with them, including the walls of containers. - Q6: What happens to liquid pressure as depth increases?
Answer: Increases
Explanation: Pressure in a liquid increases with depth due to the weight of the liquid above. - Q7: What do we call the pressure exerted by air?
Answer: Atmospheric
Explanation: Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere. - Q8: What instrument is used to measure atmospheric pressure?
Answer: Barometer
Explanation: A barometer is used to measure atmospheric pressure accurately. - Q9: What is reduced when skis are used on snow to prevent sinking?
Answer: Pressure
Explanation: Skis increase the surface area, reducing pressure on snow and preventing sinking. - Q10: Which gas layer around Earth exerts atmospheric pressure?
Answer: Air
Explanation: The blanket of air around the Earth applies pressure due to its weight.
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