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A set of n bateries are connected in series ; the orientation of them being same (say right side positive and left side negative) out of which k batteries are such that their orientation is opposite.What is the net emf of the ...

A capacitor is connected to a battery of votage V.Then a dielectric of strength K is inserted between the plates of the capacitor while it is still connected to the battey.What is the voltage across the plates of the capacito ...

*Image* What is the resistance between A and B ? ...

What is the probability os a nucleus to stay intact till t = mean life ? ...

*Image* A current-carrying conductor which is in the for ma of a sine wave given as y = A sinx lies on a magetic field. What is the force exerted by the magnetic field ? ...

In the transformer core is made of soft iron to reduce ...

A particles velocity is given as v = t + 1/t where t is the time.What is the minimum possible value of relative velocity between its image wrt a fixed plane mirror and itself ? ...

When NPN transistor is used as an amplifier ...

A mole of N2H4 loses ten moles of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y?(there is no change in the oxidation number of ...

A solution is a mixture of 0.05 M NaCl and 0.05 M NaI. The conc. of iodide ion when AgCl just starts precipitating is equal to ( Ksp(AgCl)=10-10; Ksp(AgI)=4*10-16) ...

In decimolar solution, CH3COOH is ionised to the extent of 1.3%. If log1.3=0.11, what is the pH of the solution? ...

The equilibrium constant Kp for the reaction PCl5→PCl3+Cl2 is 1.6 at 200°C. The pressure at which PCl5 will be 50% dissociated at 200°C is ...

In what manner will increase of pressure affect the following equation? C(s)+H2O(g) → CO(g)+H2(g) ...

One mole of a non-ideal gas undergoes a change of state (2 atm, 3 L, 95 K)→(4 atm, 5 L, 245 K) with a change in internal energy, ΔU=30 L atm. The change in enthalpy(ΔH) of the process in L atm is ...

The correct expression relating molality(m), molarity(M), density(d), and molar mass(M2) of solute is ...

Equal weights of phosphorus and oxygen combine to form a mixture of P4O6 and P4O10. Both reactants are exhausted. The mole ratio of P4O6:P4O10 in the products is ...

A point charge is placed at ne of the vertex of the cube.What is the total flux through the cube ? ...

A particle is moving according to the equation X = 3 (sin(2t+λ) + cos(2t+λ)).What is its amplitude ? ...

The kinetic energy and the potential energy of a particle performing SHM will be same when ...

Thre discs A B and C having radii 2m , 4m and 6m are coated with carbon black on their surface.The wavlength corresponding to the maximum intensity are 300nm,400nm and 500nm respectively.The power emitted is maximum for ...

Which of the following law states that "good absorbers of heat are good emitters" ...

During an adiabatic process the pressure of a gas is found to be proportional to the cube of temperature of the gas.The Cp/Cv of the gas is ...

A solid X+Y- has a bcc structure. If the distance of closest approach between the the two atoms is 173 pm, the edge length of the cell is ...

The ratio between the root mean square velocity of H2 at 50 K and that of O2 at 800 K is ...

The set of all real numbers x for which x2-|x+2|+x>0, is ...

Find the area bounded by the curves 2|x|+3|y|=6 ...

Let f(x) be a function such that f(x), f'(x) and f''(x) are in GP, then function f(x) is ...

f(θ)=sinθ(sinθ+sin3θ). Then f(θ) ...

1 ∫ (1-x)/1+x) dx= 0 ...

Consider an infinite geometric series with first term a and common ratio r. If its sum is 4 and second term is 3/4, then a= ...