Grade 8 Natural Sciences Quiz

An object will become positively charged if..........

• A. electrons are added to atoms.

• B. electrons are removed from atoms

• C. protons are added to atoms

• D. protons are removed from atoms

The following component can be used to control the current that flows in a circuit diagram.

• A. a cell

• B. an ammeter

• C. a switch

• D. a voltmeter

By passing white light through a prism, you can tell —

• A. that white light is actually a mixture of different colors

• B. the mass of the prism

• C. the original source of the light

• D. that blue light is brighter than white light

Which of these cause the bits of paper to be attracted to the comb?

• A. Magnetic forces

• B. Chemical reactions

• C. Static electricity

• D. Heat differences

During a thunderstorm, you see the lightning before you hear thunder. This is because —

• A. light has a greater mass than sound

• B. sound has longer wavelengths than light

• C. light travels faster than sound

• D. sound and light travel at the same speed

What part of the eye acts like a movie screen where images focus?

• A. iris

• B. lens

• C. pupil

• D. retina

Which type of vision makes nearby objects appear fuzzy?

• A. far-sightedness

• B. irregular

• C. near-sightedness

• D. normal

What spectrum of light is seen by humans?

• A. electromagnetic

• B. infrared

• C. ultraviolet

• D. visible

A neutral object will obtain a positive charge when

• A. protons are added to the object.

• B. electrons are added to the object.

• C. protons are removed from the object.

• D. electrons are removed from the object.

When you are riding a bicycle at night, your bicycle's reflectors help people in cars see your bicycle. How do bicycle reflectors work?

• A. They are made of a special material that gives off its own light.

• B. They are hooked up to batteries that allow them to produce light.

• C. They bounce light back from other sources.

• D. They are covered with paint that glows in the dark.