Waec Physics 1996 Past Questions and Answers

Question 41:

• WAEC 1996

The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms^-1, calculate the distance between two successive particles which are in phase

A. 20m
B. 2.5m
C. 3.0m
D. 5.0m
E. 50.0m

Question 42:

• WAEC 1996

The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.

A. 128ms^-1
B. 192ms^-1
C. 384ms^-1
D. 768ms^-1
E. 1536ms^-1

Question 43:

• WAEC 1996

CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.

A. 2.38 x 10⁷W
B. 7.92 x 10⁶W
C. 3.96 x 10⁶W
D. 2.64 x 10⁶W
E. 7.92 x 10⁴W

Question 44:

• WAEC 1996

The main function of the mouth of a telephone is to convert sound energy into

A. Heat energy
B. Light energy
C. Chemical energy
D. Electrical energy
E. Mechanical energy

Question 45:

• WAEC 1996

Which of the following is not a component of a d.c. electric motor?

A. Commutator
B. Field magnets
C. Slip rings
D. Armature
E. Carbon brushes