Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are R1 and R2 (R2 > R1). If the potential difference across the source having internal resistance R2 is zero, then

Anonymous User Physics Current Electricity 10 Apr, 2020 1 Answer 66 views


In a metre bridge experiment null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y?

Anonymous User Physics Current Electricity 10 Apr, 2020 1 Answer 62 views

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then what will be the ratio of the currents passing through the wire?

Anonymous User Physics Current Electricity 10 Apr, 2020 1 Answer 60 views



The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant temperature. At high temperature and high pressure, Z is usually more than one. This fact can be explained by van der Waals equation when

Anonymous User Chemistry 09 Apr, 2020 1 Answer 84 views

















The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is  If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is

Anonymous User Physics Current Electricity 08 Apr, 2020 1 Answer 56 views









The ionisation energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water is endothermic to the extent of 1 kcal per mol. If the solvation energies of Na+ and Cl– ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion

Anonymous User Chemistry 07 Apr, 2020 1 Answer 59 views

At 88°C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in mixture with toluene that will boil at 88°C at 1 atm pressure assuming ideal solution.

Anonymous User Chemistry 07 Apr, 2020 1 Answer 210 views


Salts of A (atomic weight 7), B (atomic weight = 27) and C (atomic weight 48) were electrolysed under identical conditions using same quantity of electricity. It was found that when 2.1g of A was deposited, weights of B and C deposited were 2.7g and 7.2g. The valencies of A, B and C are respectively.

Anonymous User Chemistry 07 Apr, 2020 1 Answer 71 views




A charged particle q is shot towards another charged particle Q which is fixed, with a speed v. It approaches Q upto a closest distance r and then returns. If q were given a speed 2v, what will b the closest distances of approach?

Anonymous User Physics Electrostatic 07 Apr, 2020 1 Answer 59 views

Two spherical conductors B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having the same radius as that of B but uncharged is brought in contact with B, then brought in contact with and finally removed away from both. The new force of repulsion between B and C is

Anonymous User Physics Electrostatic 07 Apr, 2020 1 Answer 78 views