Physics 2000 NECO Past Questions

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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

View Answer & Discuss (1) 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)

View Answer & Discuss (7) 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

View Answer & Discuss NECO 2000

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400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 30°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)