Physics Past Questions and Answers

All electromagnetic waves in a vacuum have the same

A Wavelength
B Frequency
C Speed
D Amplitude

Question 3872:

The diagram given illustrates two charged particles W and X. The charges on W and x are respectively

A Negative; negative
B Negative; positive
C Positive; positive
D Positive; negative

Question 3873:

An alternating current supply is connected to an electric lamp which lights with the same brightness as it does with direct current source emf 6v. The peak potential difference of the a.c supply is

A 4.6v
B 6.0v
C 8.5v
D 12.0v

Question 3874:

An electric generator rated 12 kW, 2 kV distribute power through a cable of resistance 20\(\Omega\). Calculate the power loss in the cable.

A 120 w
B 360 w
C 720 w
D 2400 w

Question 3875:

Which of the following statements is correct? When capacitors of different values are connected in series

A The same charge flows through them
B The same voltage appears across each capacitor
C Different quantities of charges flow through them in different voltages across them
D Different quantities of charges flows through them with the same voltage across them