Physics Quiz on AC and Radiation

Which of the following is the correct formula for root mean square (r.m.s.) value of an alternating current?

• I_rms = I_peak

• I_rms = I_peak / sqrt(2)

• I_rms = I_peak * sqrt(2)

• I_rms = I_peak / 3

The opposition to current flow in an AC circuit due to capacitance is called:

• Inductive reactance

• Impedance

• Conductance

• Capacitive reactance

In an AC circuit, the phase difference between voltage and current in a purely inductive circuit is:

• 0°

• 45°

• 90°

• 180°

Which of these is NOT a part of an RLC circuit?

• Resistor

• Inductor

• Capacitor

• Transformer

The total opposition to AC flow in a circuit is called:

• Resistance

• Inductance

• Impedance

• Capacitance

Who proposed the planetary model of the atom?

• J.J. Thomson

• Niels Bohr

• Ernest Rutherford

• James Chadwick

The cathode rays in J.J. Thomson’s experiment are actually:

• Protons

• Neutrons

• Electrons

• Alpha particles

Which type of radiation has the highest penetrating power?

• Alpha radiation

• Beta radiation

• Gamma radiation

• X-rays

Which of the following is a property of alpha particles?

• They have no charge

• They are negatively charged

• They are positively charged

• They travel at the speed of light

What happens to an atom that undergoes beta decay?

• Its mass number increases by 1

• Its atomic number increases by 1

• Its atomic number decreases by 1

• It loses two protons