Waec Physics Past Questions
Question 1711
The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. calculate the effort required to lift a load of mass 20kg using this machine, [g = 10 m s\(^{-2}\)]
- A. 20N
- B. 25N
- C. 40N
- D. 100N
Question 1712
Which of the following descriptions of the image formed by a plane mirror is not correct. the image is----
- A. erect and of the same size as the object
- B. laterally inverted and of the same size as the object
- C. erect and bigger than the object
- D. virtual and if the same size
Question 1713
The magnetic material produced from the chemical combination of metal oxides and has a very high resistance to electric current is called
- A. ferrite substance
- B. paramagnetic substance
- C. ferromagnetic substance
- D. diamagnetic substance
Question 1714
The period of a 10 kHz radio wave traveling at 10\(^{8}\) ms\(^{-1}\) is--
- A. 3.0 x 10\(^{-5}\)s
- B. 1.0 x 10\(^{-4}\) s
- C. 1.0 x 10\(^{4}\)s
- D. 3.0 x 10\(^{4}\)s
Question 1715
Current is passed through two parallel conductors in the same direction. If the conductors are placed near each other, they will------------------
- A. move in a circle
- B. repel each other
- C. remain stationary
- D. attract each other
