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?
|
|
|
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?
|
|
|
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
|
|
|
8.
|
The electric potential difference across a 5-ohm resistor with a current of 5
amps is
|
|
|
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.
|
Radioactivity was first discovered by
A) | Becquerel | B) | Roentgen | C) | Rutherford | D) | Cuie |
|
|
|
11.
|
An atom with 74 protons, 109 neutrons and 74 electrons has a mass number
of
|
|
|
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 |
|