Waec Physics Past Questions For Year 1996
Question 31
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
- A. 2.0cm
- B. 3.3cm
- C. 5.0cm
- D. 10.0cm
- E. 15.0cm
Question 32
The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.
- A. 18o
- B. 34o
- C. 45o
- D. 68o
- E. 90o.
Question 33
A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?
- A. 1.65
- B. 1.58
- C. 1.52
- D. 1.50
- E. 1.48
Question 34
The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)
- A. 1320m
- B. 660m
- C. 600m
- D. 330m
- E. 165m
Question 35
A sound wave of velocity 350 ms-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water
- A. 82.4ms-1
- B. 148.8ms-1
- C. 350.0ms-1
- D. 1487.5ms-1
- E. 3500.5ms-1.
