Physics Past Questions and Answers

Which of the following obeys Ohm's law?

Which of the following statements are TRUE of isotopes?
I. Isotopes of an element have the same chemical properties because they have the same number of electrons
II. Isotopes of elements are normally separated using physical properties
III. Isotopes of an element have the same number of protons in their nuclei

In the diagram given the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static

Which of the following may be used to explain a mirage?
I. Layers of air near the road surface have varying refractive indices in hot weather
II. Road surfaces sometimes become good reflectors in hot weather
III. Light from the sky can be reflected upwards after coming close to the road surface.

In the diagram given if the atmospheric pressure is 760mm, the pressure in the chamber G Is