Physics
Assertion (A) : Water is not used as a barometric liquid because it does not stick to the glass surface.
Reason (R) : Barometric liquid should be such that should neither wet nor stick to the glass surface.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Answer
assertion is false but reason is true
Explanation
Assertion (A) is false because water is not used as a barometric liquid mainly due to it's low density, so the height of the water column would be very large to balance atmospheric pressure and it also sticks to glass, which is not desirable in a barometer.
Reason (R) is true because this is the essential property of a good barometric liquid as it should neither wet nor stick to the glass for accurate readings and clear visibility of the level.
Related Questions
Altimeter is used in an aircraft to measure :
- atmospheric pressure
- altitudes
- speed
- distance travelled
Assertion (A) : As we move to higher altitudes, at times nose bleeding occurs.
Reason (R) : The reason for nose bleeding is excess of atmospheric pressure over the blood pressure.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : A brick exerts maximum pressure on ground when it is placed with its longest side vertical.
Reason (R) : Larger the area on which a given thrust acts, lesser is the pressure exerted by it.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Assertion (A) : The walls of a dam are made thicker at the bottom.
Reason (R) : Pressure is the same in all directions about a point inside the liquid.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false