Physics Past Questions and Answers

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

A Yellow and red
B Orange and green
C Violet and blue
D Blue and green
E Red and indigo

Question 2342:

Given that the gravitational constant is 7 X 10^-11 Nm2kg^-2, what is the force of attraction between 10⁶kg mass of lead hanging one metre away from a 10³kg mass of iron?

A 7 x10^-20N
B 7 x 10^-5N
C 7x10^-2N
D 7x10³N
E 7x10⁰N

Question 2343:

Calculate the current in the 3Î© resistor shown in
the diagram above.

A 3.0A
B 4.0A
C 4.3A
D 12.0A
E 39.0A

Question 2344:

What is the electric potential energy between two protons each of charge q and at a distance of r apart? (Permittivity of free space = Îµ_o)

A 4Ï€Îµ_oq²r
B Qr/4πε_o
C Q/4Ï€Îµ_or
D Q²/4Ï€Îµ_or
E Q²/4Ï€Îµ_or

Question 2345:

A work of 30 joules is done is transferring 5 millicoulombs of charge from a point B to a point A in an electric Held. The potential difference between B and A is

A 1.7 x 10^-4V
B 3.4x10^-4V
C 1.5x10^-1V
D 6.0 x10³V
E 1.2 x10⁴V