Waec Physics Past Questions For Year 2022
Question 11
The periodic rise and fall in the intensity of sound produced whn two notes of nearly equal frequencies are sounded together is called?
- A. doppler effect
- B. beat
- C. interference
- D. resonance
Question 12
An object is placed at different distances, u, from a converging lens of focal length, 15.0cm. For what value of u does the lens act as a microscope?
- A. u = 15cm only
- B. u = 30cm only
- C. M < 15cm only
- D. u > 30cm only
Question 13
A freely suspended compass needle on the earth's surface settles in a plane called----------
- A. geographic meridian
- B. magnetic meridian
- C. magnetic declination
- D. isoganals
Question 14
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 15
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
