AnswersDCSS Physics CR 24-25Unit Test

Unit Test — Unit test Answers

0 verified answers
1
Free Preview

Which statements are supported by the graph? Check all that apply.

A
For large atoms, more neutrons than protons are needed to be stable.
B
Nuclei that have 90 or greater protons are always radioactive.
C
Atoms must have equal numbers of protons and neutrons to be stable.
D
Atoms that have less than 10 protons do not need neutrons to be stable.
2
Free Preview

Thermal energy from the Sun travels to Earth by

A
conduction.
B
charged molecules.
C
electromagnetic waves.
D
convection currents.
3

A steam turbine is a device in which high-pressure steam enters the turbine and causes blades to spin. The spinning blades have mechanical energy.

A
The turbine absorbs heat, which creates kinetic energy in the system and produces work to turn the blades.
B
The turbine destroys some of the thermal energy in the steam, which generates work and turns the blades.
C
The turbine generates heat from the steam, and some of the heat creates work and turns the blades.
D
Some of the heat used to make the steam is transformed into work as the steam pushes against the blades to make them turn.
4

What are the units for measuring specific heat?

A
degrees Celsius per gram
B
joules per degrees Celsius
C
joules per gram degree Celsius
D
degrees Celsius per joule gram
5

A piston uses 32 J of energy to do work as 68 J of heat are added to the cylinder of the piston. The change in internal energy of the system is J.

Answer not available
6

Temperature is a measure of the average energy of particles in a substance.

Answer not available
7

Temperature and kinetic energy have a relationship.

Answer not available
8

The nuclear equation is incomplete.

Question illustration
A
Superscript 12 Subscript 6 Baseline M g
Option A
B
Superscript 11 Subscript 5 Baseline B
Option B
C
Superscript 11 Subscript 5 Baseline N a
Option C
D
Superscript 12 Subscript 6 Baseline C
Option D
9

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) Celsius.

Answer not available
10

What is the energy equivalent of an object with a mass of 2.5 kg?

A
5.5 × 108 J
B
7.5 × 108 J
C
3.6 × 1016 J
D
2.25 × 1017 J
11

Which is not a form of ionizing radiation?

A
ultraviolet light
B
gamma rays
C
X-rays
D
infrared light
12

[BLANK]

A
decrease
B
increase
C
remain constant
D
constantly fluctuate
13

Water has a specific heat of 4.186 J/g°C. How much heat is required to increase 10.0 g of water from 25.0°C to 30.0°C?

A
5.0 J
B
21 J
C
42 J
D
209 J
14

Gazala makes a graphic organizer to compare nuclear fission and nuclear fusion.

Question illustration
A
X: Provides household electricityY: Has rods containing uranium
B
X: Provides household electricityY: Requires high temperature and pressure
C
X: Converts mass into energyY: Does not produce usable amounts of energy
D
X: Converts mass into energyY: Is controlled by neutron absorption
15

The diagram shows an example of convection.

Question illustration
A
Warmer water sinks
B
Warmer water rises
C
Cooler water sinks
D
Cooler water rises
16

What conditions are required for nuclear fusion?

A
high temperature and low pressure
B
high temperature and high pressure
C
low temperature and high pressure
D
low temperature and low pressure
17

Sadira makes a graphic organizer to show how geologists and archaeologists use radioisotopes.Which labels belong in the regions marked X and Y?

Question illustration
A
X: Uses carbon-14Y: Uses uranium-238
B
X: Uses uranium-238Y: Determines ages of objects
C
X: Determines ages of objectsY: Uses uranium-238
D
X: Uses isotopes with short half-livesY: Determines ages of objects
18

Which describes why radioisotopes can be used as tracers in studying the biological and chemical processes of plants?

A
The radioisotope is chemically identical to the nonradioisotope the plant normally uses.
B
The radioisotope is absorbed more quickly than the nonradioisotope the plant normally uses.
C
The radioisotope converts the nonradioisotope normally used by a plant into a radioisotope.
D
The radioisotope travels through the plant without participating in any chemical processes.
19

A measure of the disorder of a system is called .

Answer not available
20

Which formula can be used to solve problems related to the first law of thermodynamics?

A
Q = W + U
Option A
B
Q = U – W
Option B
C
Q = U + W
Option C
D
Q = U – W
Option D

Did you find these answers helpful?

More from this Course

Quiz
6 verified answers

Unit Test

Quiz
3 verified answers

Unit Test