AnswersDCSS Physical Science CR 24-25Cumulative Exam

Cumulative Exam Answers

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1
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A probe is launched from Earth and lands on Mars. The gravitational acceleration on Mars is 3.7 m/s2.

A
The mass of the probe remains the same, but the weight of the probe increases.
B
The mass of the probe remains the same, but the weight of the probe decreases.
C
The mass of the probe increases, but the weight of the probe remains the same.
D
The mass of the probe decreases, but the weight of the probe remains the same.
2
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Jan is holding an ice cube. What causes the ice to melt?

A
Thermal energy from the ice is transferred to the air.
B
Thermal energy from Jan’s hand is transferred to the ice.
C
The air absorbs thermal energy from Jan’s hand.
D
Jan’s hand absorbs thermal energy from the ice.
3

What is the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high? (Formula: PE = mgh)

A
75 J
B
735 J
C
245 J
D
37.8 J
4

Which best describes a difference between electric current and static electricity?

A
Electric current is continuous, and static electricity is not continuous.
B
Static electricity is continuous, and electric current is not continuous.
C
Electric current involves the movement of electrons, and static electricity involves the movement of protons.
D
Static electricity involves the movement of electrons, and electric current involves the movement of protons.
5

Pravat exerts a force of 30 N to lift a bag of groceries 0.5 m. How much work did Pravat do on the bag?Note : Work = Force x Distance

A
0 J
B
15 J
C
30 J
D
60 J
6

Sonya reads the element riddle below.I am shiny. I form +1 ions. There’s more!I am the most reactive metal in Period 4. Who am I?Which element is the answer to the riddle?

A
krypton
B
potassium
C
sodium
D
bromine
7

This chart lists four elements from the periodic table.Atoms from which two elements would form ionic bonds?

Question illustration
A
calcium and gold
B
gold and argon
C
argon and iodine
D
iodine and calcium
8

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

A
magnesium (Mg)
B
barium (Ba)
C
cesium (Cs)
D
rubidium (Rb)
9

Carlos is making phosphorus trichloride using the equation below. 2P +3Cl2 _PCl3What coefficient of PCl3 would show that the law of the conservation of mass is represented in the chemical equation?

Question illustration
A
4
B
3
C
2
D
1
10

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
11

Which would increase the speed of a sound wave?

A
A wave passes from a solid to a liquid while remaining the same temperature.
B
The medium increases in temperature while remaining in the same phase.
C
The medium decreases in temperature while remaining in the same phase.
D
A wave passes from a liquid to a gas while remaining the same temperature.
12

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O?

A
CaCO3 is a reactant; it is present before the reaction occurs.
B
CaCl2 is a reactant; it is present before the reaction occurs.
C
CO2 is a reactant because it is most likely a gas.
D
H2O is a reactant because it is most likely a liquid.
13

What is the kinetic energy of a toy truck with a mass of 0.75 kg and a velocity of 4 m/s? (Formula: )

Question illustration
A
3 J
B
6 J
C
12 J
D
24 J
14

Which sound is most likely the most intense?

A
a whisper
B
a rock concert
C
normal speech
D
the sound of rain
15

The field lines around one end of a bar magnet are shown below.

Question illustration
A
It is a south pole because the field lines spread out from this end.
B
It is a north pole because the field lines spread out from this end.
C
It is a south pole because the field lines enter the magnet at this end.
D
It is a north pole because the field lines enter the magnet at this end.
16

Bill does 1500 J of work on a lever, which is a simple machine. The lever does 1350 J of work on a stone.What is the efficiency of the lever?

A
0.9%
B
1.1%
C
90%
D
111%
17

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration?

A
negative acceleration of 4 m/s2
B
positive acceleration of 4 m/s2
C
positive acceleration of 9 m/s2
D
negative acceleration of 9 m/s2
18

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

A
physical change: breaking stickschemical changes: lighting the fire, boiling water
B
physical change: boiling waterchemical change: breaking sticks, lighting the fire
C
physical changes: lighting the fire, boiling waterchemical change: breaking sticks
D
physical changes: breaking sticks, boiling waterchemical change: lighting the fire
19

How does a machine, such as a ramp, help make work easier?

A
A machine can help decrease the input force and the output force.
B
A machine can help increase the input force and the output force.
C
A machine can help increase the input force and decrease the output force.
D
A machine can help decrease the input force and increase the output force.
20

Which is an example of negative acceleration?

A
a snowboarder who increases speed when traveling downhill
B
a biker who maintains a constant speed through a race
C
a skateboarder who reduces speed when moving up a hill
D
a runner who fluctuates speed by increasing and decreasing speed

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