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.

Would you expect the first ionisation enthalpies for two isotopes of the same element to he the same or different? Justify your answer.

A proton and an alpha particle are accelerated through the same potential difference. Which one of the two has less kinetic energy? Justify your answer.

Two identical loops, one of copper and the other of aluminium are rotated with the same angular speed in the same magnetic field, compare current produced in the two coils. Justify your answer.

An electron and a proton are accelerated through the same potential. Which one of the two has (i) greater value of de Broglie wavelength associated with it and (ii) less momentum? Justify your answer.

Net capacitance of three identical capacitors in series is 2 mu F . Find the ratio of the energy stored in the two configurations if they are both connected to the same source.

Two stretched strings has lengths 'l' and '2l' while tensions are 'T' and '4T' respectively. If they are made of same material the ratio of their frequency is

Two posts were offered to a man. In the first one the starting salary was Rs. 120 per month and the annual increment was Rs. 8, In the second post the salary commenced at Rs. 85 per month but the annual increment was Rs. 12. The man decided to accept that post which would give him more total earnings in the first twenty years of his service. Which post was acceptable to him ? Justify your answer.

A deuteron and a proton are accelerated by dee cyclotron. Can both be accelerated with the same oscillator frequency ? Give reason to justify your answer.

An alpha -particle and a proton are released from the centre of a cyclotron and made to accelerate. Can both be accelerated at the same cyclotron frequency ? Give reason to justify your answer.