PHY101 Final Term Solved MCQs by Junaid

Q1. The units of the Planck constant h are those of:

1. energy
2. power
3. momentum
4. angular momentum

E. frequency

Q2. Which of the following is true of all virtual images?

1. They can be seen but not photographed
2. They are ephemeral
3. They are smaller than the objects
4. They are larger than the objects

E. None of the above

Answer: E

Q3. In constructing a thermometer it is NECESSARY to use a substance that:

1. expands with rising temperature
2. expands linearly with rising temperature
3. will not freeze
4. will not boil

E. undergoes some change when heated or cooled

Q4. A 60-watt light bulb carries a current of 0.5 A. The total charge passing through it in one hour is:

1. 120 C
2. 3600 C
3. 3000 C
4. 2400 C

E. 1800 C

Q5. If the charge on a parallel-plate capacitor is doubled:

1. the capacitance is halved
2. the capacitance is doubled
3. the electric field is halved
4. the electric field is doubled

Q6. the wavelength of red light is 700 nm. Its frequency is:

1. 4.30*104 Hertz
2. 4.30*105 Hertz NOT SURE
3. 4.30*103 Hertz
4. 4.30*102 Hertz

Q7. A capacitor C “has a charge Q”. The actual charges on its plates are:

1. Q, Q
2. Q/2, Q/2
3. Q , −Q
4. Q/2, −Q/2

Q8. How fast should you move away from a 6.0 × 1014 Hz light source to observe waves with a frequency of 4.0 × 1014 Hz?

1. 0.20c
2. 0.38c
3. 0.45c
4. 0.51c

E. 0.76c

Q9. The units of the electric field are:

1. J/(C·m)
2. J/C
3. J·C
4. J/m

Q10. If two light waves are coherent:

1. their amplitudes are the same
2. their frequencies are the same
3. their wavelengths are the same
4. their phase difference is constant

Q11. In a photoelectric effect experiment at a frequency above cut off, the

1. the energy of the least energetic electron before it is ejected
2. the energy of the least energetic electron after it is ejected
3. the energy of the most energetic electron before it is ejected