Question

Which of the following objects is/are not opaque? [4 marks]
A. Eraser
B. Wooden plank
C. Empty glass
D. Cardboard
E. Wax paper
F. Steel bottle

Answer 1

• We know that erasers, wooden plank, cardboard box and steel bottle are opaque because they do not allow any light to pass through them. [1 mark]
  
• An empty glass is a transparent object because it allows light to completely pass through it. Hence, it is a transparent object and is not opaque. [1 mark]
• Wax paper also allows some amount of light to pass through. Hence, it is a translucent object and is not opaque. [1 mark]

So, the answer is C and E - empty glass and wax paper

• They are not opaque because they allow completely or partially the light to pass through it [1 mark]