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 Name:    Practice Test 3A

Multiple Choice

Use the following information to answer the next two questions:

A transformer has 500 turns on its primary coil and 200 turns on its secondary coil.

1.

If the input voltage is 100 volts, what is the output voltage?
 A) 40 volts B) 250 volts C) 100 volts D) 500 volts

2.

If the current through the primary coil is 0.50 A, what is the current through the secondary coil?
 A) 0.50 B) 1.0 A C) 0.20 A D) 1.25 A

3.

A negatively charged body has
 A) lost protons B) gained electrons C) gained protons D) lost electrons

4.

The half-life of a radionuclide is 12 years.  How long does it take for a sample of this radionuclide to decay from 80 g to 10 g?
 A) 24 years B) 48 years C) 4 years D) 36 years

5.

What type of energy conversion does a generator perform?
 A) mechanical energy into chemical energy B) electrical energy into mechanical energy C) chemical energy into mechanical energy D) mechanical energy into electrical energy

6.

Which of the following is an isotope of ?
 A) B) C) D)

7.

The current running through a 60-watt lamp powered by a 120-volt source is
 A) 90 A B) 2 A C) 7200 A D) 0.5 A

8.

What happens to the atomic number (Z) and mass number (A) of a nuclide after an alpha decay?
 A) Z decreases by 1; A is unchanged B) Z decreases by 2; A decreases by 4 C) Z increases by 2; A increases by 4 D) Z increases by 1; A is unchanged

9.

Which of the following correctly describes the subatomic particles of a zinc atom (Z=30, A=65)
 A) 35 protons; 30 neutrons; 30 electrons B) 30 protons; 35 neutrons; 35 electrons C) 30 protons; 65 neutrons; 30 electrons D) 30 protons; 35 neutrons; 30 electrons

10.

The idea of the atomic nucleus was investigated experimentally by
 A) Curie B) Rutherford C) Bohr D) Becquerel

11.

One difference between electric charges and magnetic poles is that
 A) magnetic poles do not create magnetic fields. B) opposite magnetic poles repel. C) one magnetic pole cannot create magnetic poles in other materials. D) a magnetic pole cannot be ioslated.

12.

When undergoes beta decay, what is the identity of the daughter nuclide?
 A) B) C) D)

13.

Three resistors of 4, 6, and 10 ohms are connected in series to a 12-volt battery.  The current flowing through this circuit is
 A) 1.67 A B) 240 A C) 20 A D) 0.6 A

14.

Two equal positive charges are placed equal distance from another positive charge.  What force does the middle positive charge experience?
 A) A net force to the left B) A net force to the right C) a zero net force D) none of the above

15.

Two resistors of 4 and 6 ohms are connected in parallel.  The total resistance of this cirucuit is
 A) 2.4 ohms B) 4.8 ohms C) 2.0 ohms D) 3.6 ohms