Physics Past Questions and Answers

What is the coefficient of static friction between a load of mass 2kg and a horizontal surface, if the limiting frictional force is 10N? (g = 10 ms^-2)

A 0.2
B 0.5
C 2
D 5
E 8

Question 32:

When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is ____________

A Anti-clockwise
B Clockwise
C Equal to the product to the forces
D Numerically equal to the total forces acting
E Equal to zero

Question 33:

The specific heat of a substance in the solid state is C₁; its specific beat in the liquid state is C₂ and its latent heat of fusion is L. If a mass M of the substance is changed from the solid state at temperature T, to the liquid state, also at temperature T, the amount of heat required will be ____________

A M(C₁ ÷ C₂) x T
B ML
C L
D M(C₁ + C₂) × T ÷ ML
E ML(C₁ + C₂ ÷ 2) × T

Question 34:

An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively

A (A – 2) and (Z – 2)
B (A + 4) and (Z + 2)
C (A– 4) and (Z+2)
D (A+ 4) and (Z – 2)
E (A – 4) and (Z – 2)

Question 35:

The force exerted on a charged body in an electric field depends on

I. the charge on the body
II. the electric field intensity
III. the square of the mass of the body

A I only
B II only
C I and II only
D I and III only
E II and III only