Name:    Practice Test 3B

Multiple Choice

1.

How many electrons are in a neutral atom of iron (Fe) if it has a mass number of 58 and atomic number of 26?
 A) 32 B) 84 C) 58 D) 26

2.

Which type of radiation emitted from a nucleus has the most penetrating power?
 A) beta B) gamma C) positron D) alpha

3.

Two charges a distance of 2 cm apart are moved to a distance of 10 cm apart.  What happends to the force between the two charges?
 A) It decreases by 25 times B) It decreases by 5 times C) It increases by 5 times D) It increases by 25 times

4.

decays to by emitting which of the following?
 A) alpha B) gamma C) positron D) beta

5.

A transformer with 1200 turns on its primary coil is used to decrease the voltage from 3600 volts to 120 volts.  How many turns should there be on the secondary coil?
 A) 80 B) 30 C) 40 D) 60

6.

The current in a 60-watt lamp connected to a 120-V source is
 A) 7200 A B) 90 A C) 2 A D) 0.5 A

7.

When undergoes a beta decay, the daughter nuclide is
 A) B) C) D)

8.

The electric potential difference across a 5-ohm resistor with a current of 5 amps is
 A) 100 V B) 10 V C) 25 V D) 1 V

9.

Two resistros of 20-ohms each are connected in parallel.  What is the total resistance for this arrangement?
 A) 40 ohms B) 20 ohms C) 5 ohms D) 10 ohms

10.

 A) Becquerel B) Roentgen C) Rutherford D) Cuie

11.

An atom with 74 protons, 109 neutrons and 74 electrons has a mass number of
 A) 148 B) 109 C) 74 D) 183

12.

The half-life of Na-24 is 15 hours.  Starting with 1000 g of radionuclide, how many grams would remain after 45 hours?
 A) 250 g B) 125 g C) 333 g D) 500 g

13.

The magnitude of the electric force between two charges is
 A) inversely proportional to the square of the distance between them. B) inversely proportional to the magnitude of the charges. C) directly proportional to the square of the distance between them. D) none of the above.

14.

A magnetic field is produced
 A) by electric charges in motion B) by both static and moving electric charges C) only by a permanent magnet D) by static electric charges

15.

Rutherford’s “gold foil” experiment proved that
 A) atoms are mostly empty space B) nuclei have positive charges C) nuclei are very small D) all of the above