Please enter your email: Which of these is NOT a source of light? A. A candle flame B. The sun C. The moon D. A torch Imagine a candle flame. Light from the candle flame travels ……. A. in arcs B. in straight lines C. randomly D. All of the above How fast does light travel? A. 120 kilometres per hour B. 3,000 kilometres per hour C. 3,000 kilometres per second D. 300,000 kilometres per second Light travels slightly more slowly through air than through space. It is slowed down a little bit more by glass and ……. A. metal B. water C. concrete D. wood A beam of light shining on a glass prism will ……. A. be refracted B. be completely reflected C. be completely absorbed D. not be changed at all, instead being perfectly transmitted If you half fill a clear glass with water and place a straw in the glass, how does the straw appear when you look at it carefully? A. It appears normal B. It seems to change colour C. It appears bent or broken D. It disappears completely There are forms of light which are invisible to the human eye. Which of these is an example? A. Ultraviolet B. Reflections C. Dark matter D. Starlight Visible light contains many colours. Which of the following is NOT one of these colours? A. Green B. Yellow C. Black D. Red Why does a green apple look green? A. It absorbs green light, but reflects the other colours B. It reflects green light, but absorbs all of the other colours C. It absorbs green light, but transmits all of the other colours D. It transmits all of the light A submarine’s periscope allows someone on the boat to see objects that are above the water. How is this possible? A. Light reflecting off the object curves as it enters the periscope B. Light reflecting off the object is transmitted as it enters the periscope C. Mirrors within the periscope reflect the light, enabling it to change direction D. Periscope is another name for window Loading … Question 1 of 10
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