Physics - Study Mode
[#501] The pressure exerted by a 760 mm column of mercury at 0°C is known as
Correct Answer
(A) 1 pascal
Explanation
Solution: The pressure exerted by a 760 mm column of mercury at 0 °C is known as "Pascal".
[#502] Reading of a barometer going down is an indication of
Correct Answer
(B) Rainfall
Explanation
Solution: Barometer is instrument which is used to measure to pressure. A slow downfall of reading suggests a low pressure area is passing in a nearby region, it may rain. If the reading is going down very fast then its an indication of storm (within 5-6 hours).
[#503] Increased wind speed is accompanied by a reduced air ________
Correct Answer
(B) Pressure
Explanation
Solution: The increased wind speed is accompanied by low/reduced air pressure.
[#504] A vacuum cleaner works on the principle of pressure difference. On the moon it will
Correct Answer
(B) Not work at all
Explanation
Solution: Vacuum cleaners work by creating a lower pressure just inside the opening which touches the floor. Because there is no, or very little, atmosphere on the moon, we can't create a lower or higher gas pressure inside and outside the machine, so dirt cannot be sucked up from the ground.
[#505] Middle latitude cyclones are fueled by?
Correct Answer
(A) Air high in the atmosphere
Explanation
Solution: Cyclones are fueled by the temperature differences (hence pressure gradients) that exist along frontal boundaries. They are usually strongest during cold months when temperature differences between air masses can be most extreme.