Physics Test 15...

200 MeV of energy may be obtained per fission of U²³⁵. A reactor is generating 1000 kW of power. The rate of nuclear fission in the reactor is :-

In an α-decay kinetic energy of α particle is 98 MeV and Q-value of the reaction is 100 MeV. The mass number of the mother nucleus is. (Assume that daughter nucleus is in ground state):-

The electric potential between a proton and an electron is given by  where r₀ is a constant. Assuming Bohr's model to be applicable, write variation of r_n with n, n being the principal quantum number :-

10 gm of ice at –5°C is added to 10 gm of water at 60°C. Specific heat of water = 1 cal/gm-°C; specific heat of ice = 0.5 cal/gm-°C and latent heat of ice = 80 cal/gm. The resulting temperature of the mixture is :-

28 gm of N₂ gas is contained in a flask at a pressure of 10 atm and at a temperature of 57°C. It is found that due to leakage in the flask, the pressure is reduced to half and the temperature reduced to 27°C. The quantity of N₂ gas that leaked out is

The average translational energy and the rms speed of molecules of a sample of oxygen gas at 300 K are 6.21 × 10^–21 J and 484 m/s respectively. The  corresponding values at 600 K are nearly (assuming ideal gas behaviour) :

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A particle is projected with a velocity v, so that its range on a horizontal plane is twice the greatest height attained. If g is acceleration due to gravity, then its range is :

A balloon of mass M is descending with a constant acceleration g/3. When a mass m is released from the balloon it starts rising with the same acceleration g/3. The value of m is (Assuming that its volume does not change) :-

A body is sliding down an inclined plane (angle of inclination 45°). If the coefficient of friction is 0.5 and g = 9.8 m/s². then the downward acceleration of the body in m/s² is :-