Science

Final Revision Q3– Grade 4

Multiple Choice

Identify the choice that best completes the statement or answers the question.

  1. Jake hangs two balloons from a desk so that they are close together but not touching. Jake rubs one balloon with a wool cloth. He does nothing to the other balloon. What happens when he lets go of the balloons?

  1. They push one another apart.

  1. They touch one another and pop.

  1. They touch one another and stick together.

  1. They are close together but do not touch.

  1. Cecilia is combing her hair. What will most likely happen when she holds the comb near a small, uncharged object?

  1. The object will stay where it is.

  1. The object will stick to the comb.

  1. The object will be pushed away by the comb.

  1. The object will gain a charge opposite that of the comb.

  1. Carlos wanted to know how positive and negative charges affect balloons. The balloons shown below are part of his investigation.

How could Carlos cause the balloons to attract one another and stick together?

  1. Give them both a negative charge.

  1. Give them both a positive charge.

  1. Give only one of them a positive or negative charge.

  1. Remove any positive or negative charge from both balloons.

  1. The pictures below show objects that are charged and objects that are not charged. Which shows two objects with the same charge?
  1. Which of the following best explains what happens when an object with a negative charge comes near another object with a negative charge?

  1. The objects will not move.

  1. The objects will repel each other.

  1. The objects will attract each other.

  1. The objects will cancel each other.

____

  1. Erica looked at a group of objects and classified them as electrical conductors or insulators. She made the table below to show her results.

Object / Classification
glass bead / insulator
plastic plate / insulator
aluminum foil / conductor
silver bracelet / conductor
wooden craft stick / conductor

How many objects are not classified correctly?

  1. 0

  1. 1

  1. 2

  1. 4

  1. Ariel wants to build an electric circuit with a device that can be turned on and off. Which list contains all of the materials she needs for her circuit?

  1. wire, ruler, switch, battery

  1. string, buzzer, battery, switch

  1. buzzer, wire, switch, light bulb

  1. battery, wire, light bulb, switch

  1. Clayton tries to build an electric circuit using a battery, a light bulb, a paper clip, and copper wire. The diagram below shows what he builds.

Which statement best explains why the circuit would not conduct electricity?

  1. The circuit lacks a power source.

  1. The circuit is not a complete loop.

  1. The light bulb uses the electric current.

  1. The paper clip stops the electric current.

  1. Roberto makes an electric circuit that has a switch as one of its parts. The diagram below shows the circuit that he makes.

What would happen to the light bulb if Roberto changes the switch from closed to open?

  1. It would be duller.

  1. It would be brighter.

  1. It would stop glowing.

  1. It would start glowing.

  1. Which of the following items would work best to complete a circuit?

  1. metal coin

  1. glass bead

  1. plastic straw

  1. wooden toothpick

  1. . What is the purpose of the battery in the circuit?

  1. to use the electric current

  1. to connect the components

  1. to provide a source of energy

  1. to slow the flow of electricity

  1. Joy builds an electric circuit out of several pieces of wire, a light bulb, and a battery. Now she wants to add a switch to the circuit. Which of the following would be best to use for a switch?

  1. a cotton string

  1. a metal paper clip

  1. a plastic spoon

  1. a wooden stick

  1. A boy walks across a carpet on a cold day. Then he starts to touch a doorknob, and a spark jumps from his finger to the doorknob. If the boy’s hand has a negative charge, what is the charge on the area of the doorknob close to the boy’s hand?

  1. Negative

  1. Neutral

  1. Positive

  1. both positive and negative

  1. What is static electricity?

  1. a flow of electrons

  1. an electric discharge

  1. a repelling between electrons

  1. a build up of electric charge on something

  1. Suppose you rub a plastic object on a piece of fur, causing static electricity to form on both objects. The fur now has a positive charge. What happened to the plastic object?

  1. It lost protons.

  1. It lost electrons.

  1. It gained protons.

  1. It gained electrons.

  1. An electron is the particle most easily removed from an atom. Suppose the atom in the diagram lost an electron.

What electric charge would the atom then have?

  1. Negative

  1. Neutral

  1. Positive

  1. Static

  1. . Imagine you bring a negatively charged balloon near a wall. What happens within the wall?

  1. Protons in the wall move toward the balloon.

  1. Electrons in the wall move toward the balloon.

  1. Protons in the wall move away from the balloon.

  1. Electrons in the wall move away from the balloon.

  1. During a storm, Lia saw a flash of lightning hit a tree. Later she observed that the lightning left a burn mark on the tree. Which of the following best describes what Lia can infer from what she saw?

  1. Static electricity can build up when water droplets rub against each other.

  1. Electrical energy can be transformed into light and produce heat.

  1. Atoms usually have a neutral charge but can build up a positive or negative charge.

  1. Electric current flows steadily along a path.

  1. What happens when an object with a negative charge comes near another object with a negative charge?

  1. The objects repel each another.

  1. The two objects attract each other.

  1. The objects both gain electric charges.

  1. The objects neither repel nor attract each other.

  1. Which material would be best to wrap around a very hot cup to prevent getting burned?

  1. Foam

  1. Paper

  1. plastic wrap

  1. aluminum foil

  1. Cala has two metal cups and two foam cups. She places one of each type on a metal plate and one of each type on a foam plate. She then fills each cup with very hot water.

Which cup will lose heat most slowly?

  1. foam on foam

  1. foam on metal

  1. metal on foam

  1. metal on metal

  1. . Oki’s house gets very cold on winter nights. She has one thin blanket on her bed. What could she do to stay warmer?

  1. use another thin blanket

  1. use two fluffy blankets instead

  1. use a fluffy blanket and a thin blanket

  1. use a fluffy blanket instead of the thin blanket

  1. Nadia is planning to take a hot sandwich to school for lunch. She wants to wrap it in something to keep it warm. Which material would best keep the sandwich warm?

  1. foam wrap

  1. plastic wrap

  1. waxed paper

  1. aluminum foil

  1. The pots and pans in Sarah’s kitchen are made of steel, copper, and aluminum. What is the best reason Sarah’s pots and pans are made of these materials?

  1. They are easy to shape.

  1. They have low melting points.

  1. They are excellent conductors of heat.

  1. They have the ability to stop the flow of heat.

  1. Ellie plugs a radio into an electrical outlet and turns it on. What change in energy takes place when she does this?

  1. Light energy changes into sound energy.

  1. Electrical energy changes into sound energy.

  1. Sound energy changes into electrical energy.

  1. Chemical energy changes into sound energy.

  1. . Fossil fuels are a major source of energy. Which material is not a fossil fuel?

  1. Coal

  1. natural gas

  1. oil

  1. wood

  1. Fossil fuels are the most common source of energy. What else is true of fossil fuels?

  1. They are renewable.

  1. They form quickly underground.

  1. They can be made in a laboratory.

  1. They are burned to release energy.

  1. A rolling ball has kinetic energy. What does it mean for an object to have kinetic energy?

  1. The object is in motion.

  1. The object has stored energy.

  1. The object has used all of its energy.

  1. The object is passing on its energy.

  1. Objects can have potential energy because of their position. Which object has potential energy?

  1. book sitting on a table

  1. hands turning on a clock

  1. spinning wheels on a bike

  1. flag flapping in the wind

  1. Shawn and his family sit around a campfire. What provides energy to keep the fire going?

  1. Flames

  1. Heat

  1. Matchstick

  1. Wood

  1. To make sure your measurements are clear, it is important to use appropriate units. Which of these is a unit of distance?

A. / Gram
B. / Liter
C. / Meter
D. / Second
  1. To make sure your measurements are clear, it is important to use appropriate units. Which of these is a unit of time?

A. / Gram
B. / liter
C. / Meter
D. / Minute
  1. Cars, bicycles, and people can all be objects in motion. What is it about an object in motion that is constantly changing?

A. / Acceleration
B. / Position
C. / Speed
D. / Velocity
  1. Cars, bicycles, animals, and people are all objects that can be in motion. Which statement about motion is correct?

A. / An object in motion is accelerating.
B. / Motion is the change in position of an object.
C. / Gravity and friction are responsible for all motion.
D. / An object in motion has no speed, but it does have velocity.
  1. Velocity is a measurement related to motion. What is velocity?

A. / the rate at which acceleration changes
B. / a force that opposes motion between two surfaces that are touching.
C. / a measure of both the speed and direction of a moving object
D. / the same as speed, that is, a measure of how fast something moves
  1. Which best describes friction?

A. / a unit of the metric system
B. / a unit that is a measure of force
C. / energy in the form of pushing or pulling
D. / a force that opposes motion between two surfaces that are touching
  1. Forces can affect the rate of an object’s motion. Which of these is a force?

A. / Acceleration
B. / Gravity
C. / Speed
D. / Velocity
  1. Jareem rode his bike. He traveled 30 km. It took him 3 hr. If Jareem rode at a constant speed, how fast was he traveling?

A. / 3 km/hr
B. / 10 km/hr
C. / 30 km/hr
D. / 90 km/hr
  1. A train travels 200 km in the same direction in 2 hr. What is this train’s velocity?

A. / 2 km/hr
B. / 100 km/hr
C. / 200 km/hr
D. / 400 km/hr
  1. Kinan runs at a speed of 8 min/mi. How long would it take Kinan to run 4 mi at this rate?

A. / 2 min
B. / 8 min
C. / 32 min
D. / 64 min
  1. Ashwath walked for 3 hr at a speed of 10 km/hr. How far did Ashwath walk?

A. / 3 km
B. / 10 km
C. / 30 km
D. / 300 km
  1. An object moves from point A to point B in 2 min, at a constant rate.

What is the velocity of the object?

A. / 2 min/m
B. / 9 min/m
C. / 9 m/min
D. / 18 m/min
  1. Velocity and speed are both measurements describing an object’s motion. What is a difference between velocity and speed?

A. / Speed depends on acceleration, but velocity does not.
B. / Speed does not depend on direction, but velocity does.
C. / Speed depends on velocity, but velocity does not depend on speed.
D. / Velocity depends only on friction, but speed depends only on gravity.
  1. Benny drops a ball off a bridge. The ball drops straight down, as shown in the diagram.

What happens to the ball as it falls?

A. / Both its speed and acceleration stay the same.
B. / Both its speed and acceleration increase.
C. / Its speed decreases, but its acceleration increases.
D. / Its speed increases, but its acceleration decreases.
  1. Aviv is riding his bicycle. He pedals hard to gain speed. Then he coasts along without pedaling. What kind of energy does the coasting represent?

A. / chemical energy
B. / potential energy
C. / thermal energy
D. / kinetic energy