1. Many years ago it was thought that the Earth was at the centre of the Solar System. This idea is called a ................... model.

• A. Heliocentric
• B. Geocentric
• C. Galilean
• D. Newtonian

2. Scientists now know through careful observations that the Sun is at the Centre of the Solar System. Which of the following was NOT used to observe the Solar System?

• A. Telescopes
• B. The naked eye
• C. Photography
• D. Periscopes

3. The diagram below shows a type of lens. This is called a ..

• A. Converging lens
• B. Diverging lens
• C. Dispersing lens
• D. Diffracting lens

4. The point X on the diagram above is called the

• A. image point
• B. lens point
• C. focus
• D. objective

5. Light enters the lens from a distant object. The distance from the lens to point X can then be used to find the

• A. size of the lens
• B. distance to the object
• C. wavelength of the light
• D. focal length of the lens

6. Telescopes and binoculars have two lenses - the eyepiece and the objective lens. Which answer correcly describes these?

7. All waves can be used to transmit

• A. matter and energy.
• B. matter and information.
• C. information and energy.
• D. matter, information and energy.

8. The diagram shows a light ray being bent as it enters a block of glass. Whish ray shows the correct path?

9. When light bends in this way it is called

• A. reflection
• B. refraction
• C. diffraction
• D. compression

10. The formula to calculate the speed of a wave is  v= ƒ λ . What does λ represent?

• A. frequency
• B. wave speed
• C. wavelength
• D. amplitude

11. The units used to measure frequency are hertz (Hz). 2 MHz means

• A. 2 micro hertz
• B. 200 000 Hz
• C. 2 million hertz
• D. 0.000 002 Hz