Physics Past Questions and Answers

To convert a galvanometer to a voltmeter, a

A High resistance is connected to it in series
B High resistance is connected to it in parallel
C Low resistance is connected to it in parallel
D Low resistance is connected to it in series

Question 42:

Induced emfs are best explained using

A Ohm's law
B Faraday's law
C Colomb's law
D Lenz's law

Question 43:

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

A 2.4g
B 3.2g
C 4.6g
D 4.8g

Question 44:

Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV

A -9.20eV
B -8.20eV
C -2.75eV
D -1.75eV

Question 45:

In photo-emission, the number of photo-electrons ejected per second depends on the

A Frequency of the beam
B Work function of the metal
C Threshold frequency of the metal
D Intensity of the beam