Two girls are playing on identical stringed instruments. The strings of the both instruments are adjusted to give notes of same pitch. Will the quality of two notes be same? Justify your answer.

The following table gives the distribution of students of two sections according to the marks obtained by them: Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.

Two identical heavy spheres are separated by a distance 10 times their radius. Will an object placed at the mid-point of the line joining their centres be in stable equilibrium or unstable equilibrium ? Give reason for your answer.

Comprehension-1 Two closed identical conducting containers are found in the laboratory of an old scientist. For the vertification of the gas some experiments are performed on the two boxes and the results are noted. Experimenet 1. When the two containers are weighed W_(A) = 225tg, W_(B) = 160 g and mass of evacuated container W_(C) = 100g . Experiment 2. When the two containers are given same amount of heat same temperature rise is recorded. The pressure changes found are DeltaP_(A) = 2.5 atm, Deltap_(B) = 1.5 atm . Required data for unknown gas: |(underset("molar mass")(Mono)",He,Ne,Ar,Kr,Xe,Rd),(,4g,20g,40g,84g,131g,222g),(underset(molar mass)(Dia),H_(2),F_(2),N_(2),O_(2),CI_(2),),(,2g,19g,28g,32g,71g,)| Total number of molecules in 'A' (here N_(A) = Avagadro number)

Comprehension-1 Two closed identical conducting containers are found in the laboratory of an old scientist. For the vertification of the gas some experiments are performed on the two boxes and the results are noted. Experimenet 1. When the two containers are weighed W_(A) = 225tg, W_(B) = 160 g and mass of evacuated container W_(C) = 100g . Experiment 2. When the two containers are given same amount of heat same temperature rise is recorded. The pressure changes found are DeltaP_(A) = 2.5 atm, Deltap_(B) = 1.5 atm . Required data for unknown gas: |(underset("molar mass")(Mono)",He,Ne,Ar,Kr,Xe,Rd),(,4g,20g,40g,84g,131g,222g),(underset(molar mass)(Dia),H_(2),F_(2),N_(2),O_(2),CI_(2),),(,2g,19g,28g,32g,71g,)| The initial internal energy of the gas in container 'A'. If the container were at room temperature initially

Two vibrating strings of same material stretched under same tension and vibrating with same frequency in the same overtone have radii 2r and r. Then the ratio of their lengths is:

Two identically charged spheres are suspended by strings of equal length. The strings make an angle of 30^(@) with each other. When suspended in a liquid of density 0.8 g// c c the angle remains same. What is the dielectric constant of liquid. Density of sphere =1.6 g//c c