Waec Physics Past Questions For Year 1995
Question 21
The temperature of glass vessel containing 100cm3 of mercury is raised from 10oC to 100oC. Calculate the apparent cubic expansion of the mercury. (Real cubic expansivity of mercury = 1.82 x 10-4K-1) (Cubic expansivity of glass = 2.4 x 10-5K-1)
- A. 0.52cm3
- B. 1.42cm3
- C. 1.87cm3
- D. 5.22cm3
- E. 14.22cm3
Question 22
An object is placed on the principal axis at the centre of curvature of a concave mirror. The image of the object formed by the mirror is
- A. real, inverted and magnified
- B. at the principal focus
- C. real and diminished
- D. erect and virtual
- E. at the centre of curvature
Question 23
Which of the following is not self-luminous?
- A. Incandescent electric bulb
- B. Incandescent fluorescent tube
- C. Lighted candle
- D. The moon
- E. The sun
Question 24
The image of any real object formed by a diverging lens is always
- A. inverted
- B. magnified
- C. erect
- D. real
- E. the same size as the object
Question 25
Light travels in straight lines. In which of the following is this principle manifested? I. Pinhole camera II Formation of shadows III. Diffraction of light IV. Occurrence of eclipse
- A. I and III only
- B. II and III only
- C. I, II and III only
- D. I, II and IV only
- E. I, II, III and IV
