Question 4351:

• NECO 2000

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 4352:

• NECO 2000

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 4353:

• NECO 2000

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 4354:

• NECO 2000

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 4355:

• NECO 2000

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