Waec Physics 1993 Past Questions and Answers

Question 31:

• WAEC 1993

Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?

A. Electrophorus
B. Ebonite rod
C. Proof plane
D. Gold-leaf electroscope
E. Capacitor

Question 32:

• WAEC 1993

The unit of inductance is

A. Farad
B. Henry
C. Hertz
D. Weber
E. Tesla

Question 33:

• WAEC 1993

A household refrigerator consumes electrical energy at the rate of 200 W. lf electricity costs 5 k per kWh, calculate the cost of operating the appliance for 30 days.

A. N7.20
B. N12.00
C. N30.00
D. N33.33
E. N72.00

Question 34:

• WAEC 1993

Calculate the escape velocity of a satellite launched from the earth’s surface (Take g as 10ms^-2 and the radius of the earth as 6.4 x 10⁶m)

A. 8.00 x 10⁶ms^-1
B. 1.13 x10⁴ms^-1
C. 3.58x10²ms^-1
D. 5.59 x10^-2ms^-1
E. 3.95x10^-2ms^-1

Question 35:

• WAEC 1993

What is the gravitational potential due to a point mass m at a distance from it? (G = gravitational constant)

A. -Gm²/r²
B. -Gm²/r
C. –Gm/Gr²
D. –Gm/r
E. –Gm/2