Physics MCQ Set 7

Question : The magnetic flux through the area A is

1. A×B
2. B · A
3. B × A
4. B/A

Question : When a wire of length 3cm is moved with a velocity of 2m/s perpendicularly in a magnetic field of strength 10 tesla then the e.m.f induced is

1. 0.2V
2. 0.4V
3. 0.6V
4. 0.8V

Question : To convert a galvanometer into ammeter we connect

1. Small resistance in series with galvanometer
2. Small resistance in parallel with galvanometer
3. Higher resistance in series with galvanometer
4. A shunt of zero resistance in parallel with galvanometer

Question : For accurate measurement of voltage, the voltmeter resistance should be

1. Small compared to the circuit resistance
2. Large compared to the circuit resistance
3. Neither too small nor too large
4. Equal to the circuit resistance

Question : The wavelength of last spectral line in Lyman series in terms of Rydberg constant (R) is equal to

1. R
2. R²
3. I/R
4. I/R²

Question : An electron from K-shell is knocked out and another electron jumps from higher shell to fill it. The energy is released by the second electron in the form of

1. Light-rays
2. Gamma-rays
3. X-rays
4. Beta-rays