CBSE Class 8 Science The Invisible Living World: Beyond Our Naked Eye (Class 8 NCERT New) Quiz 27

1. As light passes through the air, some of the light energy is transferred to the particles in the air. What process is occurring with this transfer of energy?

A absorption B reflection C refraction D transmission

2. Kareem told his friend about the beautiful rainbow he saw just after a rainstorm. Kareem then explained to his friend how a rainbow forms. What was Kareem’s explanation?

A The light waves were refracted by moisture in the air and separated into colors. B Tiny droplets of water reflected the light waves that struck them. C Light traveled faster after the rainstorm because of the moisture in the air. D The intensity of light increased as the waves passed through tiny droplets of water.

3. The image shows light entering water. Which statement explains why light bends when it reaches the surface of the water?

A Light bends because water changes the amount of energy it carries. B Light bends because water absorbs some of the light that reaches it. C Light bends because the water reflects some of the light that reaches it. D Light bends because water changes its speed when it moves from air into water.

4. The drawing illustrates a wave in motion. What is the name given to the substance through which a wave travels?

A a crest B a frequency C a medium D a state

5. Sound waves can move at different speeds. What can affect the speed at which sound waves travel?

A the amplitude of sound waves B the material through which sound waves travel C the distance over which sound waves travel D the frequency of sound waves

6. Look closely at the graph of the speed of sound waves in air and water. What can you conclude from the data on this graph?

A The speed of sound waves is constant. B Sound waves travel faster than light waves. C Both air and water transmit sound waves at the same speed. D The speed of sound waves depends on the medium through which they travel.

7. Sound waves travel the fastest through solids. What will slow the speed of a sound wave?

A a decrease in the distance the sound travels B an increase in the distance the sound travels C a decrease in the density of the material through which it is passing D an increase in the density of the material through which it is passing

8. Based on what Mia learned, which of the following types of electromagnetic radiation has the longest wavelength?

A red light B violet light C radio waves D infrared light

9. Based on what Mia learned, which of the following types of electromagnetic radiation has the highest frequency?

A ultraviolet light B radio waves C red light D X-rays

10. Elijah observes a flower and sees that its color is yellow. Which of the following describes why Elijah sees this color of the flower?

A The flower absorbs and reflects light. B The flower absorbs and refracts light. C The flower reflects and refracts light. D The flower refracts and blocks light.