Answers2001310 Earth Science Sem 1 - ReevesTypes of Radioactive Decay

Types of Radioactive Decay — Unit test Answers

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1
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What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
C
It is magnetized by the field of the solenoid and increases the magnetic field strength.
D
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
2
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A
mass-energy equivalence
B
mass defect
C
binding energy
D
mass-energy conservation
3

A relationship exists between gravity, mass, and distance. The greater the mass of the objects, the greater the gravitational force between them. The greater the distance between the objects, the weaker the gravitational force between them.

A
two objects, each with a mass of 10 kg, separated by a distance of 10 m
B
two objects, each with a mass of 20 kg, separated by a distance of 10 m
C
two objects, each with a mass of 20 kg, separated by a distance of 15 m
D
two objects, each with a mass of 10 kg, separated by a distance of 15 m
4

If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next room? (Assume the wall between rooms is composed of concrete.)

A
None, because the wall will block the radiation.
B
The radiation will travel through the person’s body.
C
None, because the radiation will bounce off the person’s body.
D
The radiation will be totally absorbed by the person’s body.
5

Which device converts kinetic energy into electrical energy?

A
an electric generator
B
an electric motor
C
a step-down transformer
D
a step-up transformer
6

Which best describes fusion nuclear reactors?

A
They use rods containing uranium for fuel.
B
They are currently used for electricity in several highly populated countries.
C
They are used in some naval vessels, such as submarines.
D
They have been successful, but they are very expensive to operate.
7

Yoon Ki investigates electromagnetic induction by moving a bar magnet into a coil of wire. His experimental setup is shown.

Question illustration
A
moving the magnet faster
B
using more loops of wire in the coil
C
using the south pole of the magnet
D
connecting the galvanometer to the coil
8

Which change can make a generator stronger?

A
decreasing the size of the slip rings
B
increasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the number of coils in the armature
9

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops.

A
replacing the battery, because it is not providing current
B
installing new brushes, because they are not making a good connection
C
checking the commutator, because the current is not reversing
D
adding more wire coils in the armature, because the electromagnet is too weak
10

Which remains the same as the distance of an object from Earth changes?

A
size of the force
B
strength of gravity
C
mass of the object
D
weight of the object
11

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.

Question illustration
A
reversing the battery
B
reversing the nail and using the nail’s head
C
wrapping the wire around the nail more times
D
unwrapping several loops of the wire from the nail
12

Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions.

Question illustration
A
X: Smaller nuclei formY: Thermal energy is producedZ: A larger nucleus forms
B
X: Large amounts of energy are releasedY: One or more neutrons is releasedZ: Smaller nuclei form
C
X: One or more neutrons is releasedY: A larger nucleus formsZ: Large amounts of energy are released
D
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei form
13

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

A
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
B
For large nuclei, the mass of the original nucleus is less than the mass of the products.
C
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
D
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
14

Which is a factor that keeps Earth in orbit around the Sun?

A
the orbital path of the moon
B
the gravitational pull of the Sun
C
the continuous motion of the universe
D
Earth’s changing speed and direction
15

A large atom decays and emits a particle. After the reaction is complete, the atom’s mass has changed substantially. What kind of particle has most likely been emitted?

A
alpha particle
B
beta particle
C
positron
D
photon

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