Waec Physics 1997 Past Questions and Answers

Question 26:

• WAEC 1997

The half-life of a radioactive material is 6hrs. What quantity of 1kg of the material would decay in 24 hours?

A. 15/16kg
B. 1/2kg
C. 1/4kg
D. 1/8kg
E. 1/16kg

Question 27:

• WAEC 1997

The odor of a leaking gas is perceived at a distance from the source. This is made possible by the process of

A. Sublimation
B. Diffusion
C. Osmosis
D. Evaporation
E. Capillarity

Question 28:

• WAEC 1997

Lenz’s law of electromagnetic induction is essentially a statement of the

A. Inverse square law of gravitation
B. Inverse square law of magnetism
C. Inverse square law of electrostatics
D. Law of conservation of momentum
E. Law of conservation of energy

Question 29:

• WAEC 1997

The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using

A. Octet rule
B. Right hand grip rule
C. Maxwell’s screw rule
D. Ampere’s swimming rule
E. Fleming’s left hand rule

Question 30:

• WAEC 1997

The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and the secondary250 turns, calculate the current in the secondary coil. Neglect energy losses in the transformer

A. 0.2A
B. 0.5A
C. 2.5A
D. 5A
E. 12.5A