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AIPMT 2010 Physics
Q. 17. A particle of mass M is situated at the centre of a spherical shell of same mass
and radius a. The gravitational potential at a point situated at a 
distance from
the centre, will be:
Sol : Potential at a point =
Answer : (1)
Q. 18. A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating
string of a piano. The beat frequency decreases to 2 beats per sec when the
tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was:
- 510 Hz
- 514 Hz
- 516 Hz
- 508 Hz
Sol.
Answer : (4)
Q. 19. A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be:
- 900 Ω
- 1800 Ω
- 500 Ω
- 1000 Ω
Sol.
Answer : (1)