Physics Past Questions and Answers

The working of the beam balance is based on the principle of

A Moments
B Conservation of energy
C Equivalence
D Floatation

Question 12:

Which of the following is a type of incandescent light source?

A Fluorescent lamp
B LED lamp
C Tungsten filament lamp
D Neon lamp

Question 13:

From the diagram above, if the potential difference across the resistor, capacitor and inductor are 60V, 120V and 30V respectively, the effective potential difference is

A 81
B 67
C 59
D 73

Question 14:

When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?

A The stopping potential does not change.
B The stopping potential decreases.
C The stopping potential can either increase or decrease, depending on the intensity of the light.
D The stopping potential increases.

Question 15:

Which of the following is NOT a limitation of experimental measurements?

A Systematic error
B Instrument resolution
C Random errors
D Human error