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29 questions
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- Q1A balloon has a negative charge. A glass rod has a positive charge. What will happen when the glass rod is brought near the balloon?The balloon will remain in place.The balloon will be attracted to the rod.The balloon will spin in circles.The balloon will be repelled by the rod.30s
- Q2A balloon is rubbed with a piece of cloth. As a result, the balloon has a negative charge. What has happened?Electrons have moved from the balloon to the cloth.Positive charges have traveled from the balloon to the cloth.Electrons have moved from the inside to the outside of the balloon.Electrons have traveled from the cloth to the balloon.30s
- Q3Static electricity happens when electrons pass from one object to another, such as from your hair to a comb as you comb your hair. If you then hold the comb near your hair, strands of hair appear to move forward and “stick to the comb.” The hair and the comb ...repel each other because they have the same charges.attract each other because they have opposite charges.repel each other because they have opposite charges.attract each other because they have the same charges.30s
- Q4A teenager removes the plastic wrapping from a newly purchased music CD. The pieces of wrap cling to her hand. Which of the following forces causes the wrap to cling to her hand?gravitationalelectrostaticmagneticnet30s
- Q5A copper sphere, a glass sphere, a plastic sphere, and a rubber sphere are placed on individual insulating stands. A student touches each sphere with an electrically charged object. The sphere made of which material will distribute the electric charge fastest over its entire surface area?CopperGlassRubberPlastic30s
- Q6A neutral balloon is rubbed with a piece of wool cloth. As a result, the balloon has a negative static charge. Which of the following statements best explains why the balloon has a negative charge?The balloon transfers charges to the cloth.The balloon is a conductor.The balloon is an insulator.The balloon receives charges from the cloth.30s
- Q7Which statement best describes what will happen if Bulb 2 burns out? Look at the diagram of the circuit below.Bulb 1 will stay lit and become brighter.Bulb 1 will stay lit but will become less bright.Bulb 1 will flash on and off .Bulb 1 will also burn out.30s
- Q8Each picture shows a light bulb connected to a battery. Which bulb will light?BDAC30s
- Q9The diagram shows an electrical circuit. This circuit is a series circuit becausethe current is divided between the light bulbs.the same current flows through both light bulbs.it uses a single battery.it has two light bulbs.30s
- Q10Electricity in circuits can produce light, heat, sound, and magnetic effects. Electrical circuits require a complete loop through which the electrical current can pass. Which object would you attach to the wires in this picture to enable the bulb to light up. Explain why you chose this object.D. Cotton StringA. toothpickB. ChalkC. Metal Clip30s
- Q11In the electric circuit shown, a student wants to replace Wire 1 with a different conductor. Which of the following materials could be used in place of Wire 1 to make the bulb light?a wooden pencila cotton ribbonA plastic rulera steel clothes hanger30s
- Q12A circuit is shown. What will happen if a wire is disconnected?The bell will be unable to ring.Electricity will continue to flow.The battery will run out of energy.The bulb will stay lit.30s
- Q13Assuming that the light bulbs and batteries are the same, which of these circuits would allow light bulb A to shine the brightest?C. 2 batteries and 1 bulbA. 2 Batteries and 2 bulbsB. 2 Bulbs and 1 batteryD. 1 battery and 1 bulb30s
- Q14In which of the drawings will the bulb light?CDAB30s
- Q15Look at the diagram of the bar magnets. How will the magnitude of the force change between the two magnets if they are pulled farther apart?The force would reverse the poles.The force would be strongerThe force would stay unchangedThe force would be weaker.30s
