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Chapter 23: Series and Parallel Circuits

Practice Test
  1.What happens to lights in a series if one goes out?  
  a.   every other one goes out  
  b.   they stay lit  
  c.   they flicker  
  d.   they all go out  
  2.What is the purpose of a voltage divider?  
  a.   to produce a higher voltage from a lower-voltage battery  
  b.   to produce a lower voltage from a higher-voltage battery  
  c.   to produce exactly half the voltage of a higher-voltage battery  
  d.   to produce exactly twice the voltage of a lower-voltage battery  
  3.A 60- and a 30- resistor are in parallel. What is the equivalent resistance?  
  a.   90  
  b.   2  
  c.   30  
  d.   20  
  4.Why must an ammeter have an extremely low resistance?  
  a.   High resistance reduces risk of fire.  
  b.   High resistance ensures there are fewer ohms.  
  c.   High resistance changes the voltage reading.  
  d.   High resistance will change the current in the circuit you want to measure.  
  5.What is the equation to find current in a series of three resistors?  
  a.   I = V(R1 + R2 + R3)  
  b.   I = V/(R1 × R2 × R3)  
  c.   I = V/(R1 + R2 + R3)  
  d.   I = V(R1 × R2 × R3)  
  6.What happens when an electric switch is turned off?  
  a.   The circuit is broken.  
  b.   There is a short circuit.  
  c.   A circuit breaker turns off.  
  d.   The circuit becomes a series circuit.  
  7.A 1.5 V battery is attached to a 1.0- resistor and a 2.0- resistor in series. What is the current?  
  a.   3.0 A  
  b.   4.5 A  
  c.   2.0 A  
  d.   0.50 A  
  8.If you have a 90 V power source with a 30- and 60- resistor in series, what is the voltage drop over the 60- resistor?  
  a.   90 V  
  b.   2 V  
  c.   30 V  
  d.   60 V  
  9.Two 240.0- resistors are connected in parallel and placed across a 12.0-V battery. What is the current in each branch of the circuit?  
  a.   0.0500 A  
  b.   0.0250 A  
  c.   0.100 A  
  d.   0.0125 A  
  10.Five lights of equal resistance connected in series will __________.  
  a.   never light up  
  b.   be brighter the closer they get to the positive end  
  c.   flicker  
  d.   be equally bright  

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