Waec Physics Past Questions For Year 1988
Question 21
The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.
- A. 1.2
- B. 1.0
- C. 0.8
- D. 0.6
- E. 0.3
Question 22
A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.
- A. 2/5
- B. 3/5
- C. 3/2
- D. 5/3
- E. 5/2
Question 23
Which of the following statements is/are not correct about image formed by a plane mirror?
I. The magnification produced is 1
II. The image distance is same as the object distance
III. The image is real
IV. The image is laterally inverted
- A. The magnification produced is 1
- B. I only
- C. II only
- D. III only
- E. I & II only
- F. II & IV only
Question 24
Which of the following will affect the saturation vapour pressure of a liquid?
- A. Temperature of the liquid
- B. Humidity of air
- C. Volume of vapour
- D. Volume of the liquid
- E. mass of the liquid
Question 25
Which of the following instrument may be used to measure the relative humidity?
- A. Hydrometer
- B. Barometer
- C. Manometer
- D. Hypsometer
- E. Hygrometer
