Grade 9 Energy and Change Quiz

Which of the following is a non-contact force?

• Tension force

• Normal force

• Friction force

• Electrostatic force

What is the relationship between the mass and the weight of the astronaut on the moon?

• The mass and the weight will both remain the same.

• The mass and the weight will both become less.

• The mass will be the same and the weight will be less.

• The mass will be less and the weight will be the same.

What precautionary measures should you follow when you find yourself in lightning storms?

• Run home as fast as possible.

• Find shelter under nearby trees.

• Stand next to tall objects.

• Become the shortest object.

What forces are being exerted on the bag above?

• It is only the Earth’s gravitational force on the bag.

• It is only the muscular force of the boy’s arm on the bag.

• The force of gravity and the boy’s muscular force on the bag.

• The normal force of the boy’s hand and the weight of the bag.

What is the magnitude and direction of the net force?

• 10 N to the left

• 10 N to the right

• 110 N to the right

• 110 N to the left

How did the balloon obtain the negative charge?

• Protons were transferred from the jersey to the balloon.

• Electrons were transferred from the jersey to the balloon.

• The protons and electrons were transferred from the jersey.

• The balloon initially had too many negative charges.

Why can lemons be used as electric cells?

• The lemon cells have an acidic juice which acts as an electrolyte.

• The lemon cells consist of copper and zinc which are electrolytes.

• The lemon cells have a salt bridge which completes the circuits.

• The lemon cells have an acidic juice which produces electricity.

What will the direction of the electrons in this electro-chemical cell be?

• Electrons will flow from the anode to the cathode.

• Electrons will flow from the cathode to the anode.

• Electrons will flow from the anode to the salt bridge.

• The salt bridge will transfer electrons to the cathode.

Define what the electrical resistance of a conductor is.

• A flow of electric charges throughout a circuit.

• An electrical component with a high resistance.

• A source that transfers electrical energy to charges.

• An opposition against the movement of charges.

What is the relationship between the length and the resistance of the conductor?

• The shorter the conductor the higher the resistance.

• The longer the conductor the higher the resistance.

• The length of the conductor has no effect on the resistance.

• The longer the conductor the lower the resistance.