When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by:

1. I²Rt
2. IR²t
3. IRt
4. IRt²

Specific latent heat of a substance:

1. is directly proportional to the mass
2. is directly proportional to the change in the temperature
3. depends on the material
4. is inversely proportional to the mass

Two notes are produced from two different musical instruments, such that they have same loudness and same pitch. The produced notes differ in their:

1. Waveform
2. Frequency
3. Wavelength
4. Speed

If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it:

1. decreases
2. increases
3. remains the same
4. first increases then decreases