Assertion: An open-tube manometer is a useful instruement for measuring pressure differences.
Reason: 1 bar `= 10^(5)` Pa.

Assertion : Potentiometer is used only to compare potential differences. Reason: The potentiometer draws current from the voltage source being measured .

Two U- tube manometers are connected to a same tube as shown in figure. Datermine difference of pressure between X and Y . Take specific gravity of mercury as 13.6. (g = 10 m//s^(2), rho_(Hg) = 13600 kg//m^(3))

Compute the fractional change in volume of glass slab when subjected to a hydraulic pressure of 10 atm. (1 atm = 1.013 xx 10^(5) Pa, Bulk modulus of glass = 37 xx 10^(9) pa)

Assertion Microwaves are used in microwave oven for cooking purpose. Reason The frequency of microwaves is from 10^(14) to 10^(17) Hz .

Assertion: Pressure can not be subtracted from pressure gradient. Reason: Pressure and pressure gradient have different dimensions.

A open ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Initially manometer shows no difference in mercury level in both columns as shown in diagram. After sparking 'A' dissociates according to following reaction A(g)rarrB(g)+3C(g) If pressure of Gas "A" dissociates to 0.9 atm, then (Assume temperature to be constant and is 300 K)

Assertion: In the measurement of physical quantities direct and indirect methods are used. Reason : The accuracy and precision of measuring instruments along with errors in measurements should be taken into account, while expressing the result.

Two ideal gas thermometer A and B use oxygen and hydrogen respectively . The following observations are made: Temperature, Pressure therometer A, Pressure therometer B Triple point of water, 1.250xx10^(5)Pa , 0.200xx10^(5)Pa Normal melting point of sulphur, 1.797xx10^(5)Pa , 0.287xx10^(5)Pa (a) What is the absolute temperature of normal melting point of sulphur as read by thermometers A and B ? (b) What do you think is the reason for the slightly different answers from A and B ? (The thermometers are not faulty). what further procedure is needed in the experiment to reduce the discrepancy between the two readings.

Assertion : Absolute error may be negative or positive. Reason : Absolute error is the difference between the real value and the measured value of a physical quantity.

Assertion: The diffusion of carbon dioxide is 20 times faster then oxygen. Reason: It is due to difference in partial pressure as well as solubility of diffusing gases .