Question 1

Two identical beakers each contain 250 mL of water. The temperature of the water is 85°C in one beaker and 15°C in the other beaker. A drop of red food coloring is placed in each beaker at the same time. During the irst minute, which of the following is most likely to happen?

Accepted Answer

A)  The food coloring will spread out faster in the 85°C water than in the 15°C water.
B)  The food coloring will form a layer at the top of each beaker since it does not mix with water
C)  The food coloring will spread only halfway through the water in each beaker due to convection currents.
D)  The food coloring will settle faster at the bottom of the beaker containing 85°C water than at the bottom of the beaker containing 15°C water.E) A) and D)
F) B) and D)

Question 2

The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?

Accepted Answer

A)  It can do work more quickly.
B)  It can operate for a longer time.
C)  It can burn fuel more eficiently.
D)  It can store more potential energy.E) A) and B)
F) C) and D)

Question 3

Which of the following statements best explains why drops of liquid form on the outside of a glass of ice water on a hot day?

Accepted Answer

A)  Water molecules in the air are attracted to the surface of the glass.
B)  Water molecules in the ice water lose energy as they transfer heat to the air.
C)  Water molecules in the air lose energy as they transfer heat to the cold glass.
D)  Water molecules in the ice water move through the glass pores to the outside of the glass.E) A) and D)
F) B) and C)

Question 4

The power of a toaster can be determined if which of the following values are known?

Accepted Answer

A)  the dimensions of the toaster
B)  the resistance of the toaster's insulation
C)  the voltage applied to the toaster and the toaster's temperature
D)  the current through the circuit and the voltage applied to the toasterE) A) and B)
F) None of the above

Question 5

What is the mass of an object weighing 63 N on Earth?

Accepted Answer

A)  0) 1 kg
B)  6) 3 kg
C)  73 kg
D)  617 kgE) A) and B)
F) All of the above

Question 6

A student swings a bat horizontally, making contact with a ball thrown to her. The ball leaves the bat, and the bat continues moving through the rest ofthe swing.
Which of the following statements describes the change in energy ecessary to do work on the ball?

Accepted Answer

A)  All the kinetic energy of the bat is converted to work.
B)  All the potential energy of the bat is converted to work.
C)  Some of the kinetic energy of the bat is converted to work.
D)  Some of the potential energy of the bat is converted to work.E) B) and D)
F) B) and C)

Question 7

A heated rock is placed in a container of water that is cooler than room temperature. Which of the following statements best describes what happens?

Accepted Answer

A)  Cold is removed from the container of water until the rock, the container, and the water all reach the same final temperature.
B)  The heated rock loses heat to the container of water until the rock, the container, and the water all reach the same final temperature.
C)  The heated rock loses heat to the container of water until the rock, the container, and the water each reach a different final temperature.
D)  Cold is removed from the container of water until the rock, the container, and the water each reach a final temperature lower than their original temperatures.E) None of the above
F) B) and C)

Question 8

A large container of cold water is moved from a refrigerator to a table. A hot piece of metal is placed into the water.
Which of the following best describes the final temperature of the metal?

Accepted Answer

A)  higher than the final temperature of the water
B)  the same as the final temperature of the water
C)  lower than the initial temperature of the water
D)  the same as the initial temperature of the waterE) None of the above
F) All of the above

Question 9

A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill?

Accepted Answer

A)  The cart has no energy.
B)  The cart has maximum kinetic energy.
C)  The cart has maximum gravitational potential energy.
D)  The cart has equal gravitational potential and kinetic energy.E) B) and D)
F) All of the above

Question 10

Two oppositely charged objects are separated by a small distance. The objects are then moved three times farther apart from each other. Which of the following statements best describes what happens to the electrical force between the objects?

Accepted Answer

A)  The force of attraction increases.
B)  The force of attraction decreases.
C)  The force of attraction becomes zero.
D)  The force of attraction stays the same.E) A) and C)
F) A) and D)

Question 11

How many meters is equivalent to 36.2 inches?

Accepted Answer

A)  1435 meters
B)  1) 0 meters
C)  0) 72 meters
D)  0) 92 metersE) A) and D)
F) None of the above

Question 12

Radio waves, visible light, and x-rays are examples of electromagnetic waves that always differ from each other in

Accepted Answer

A)  amplitude.
B)  intensity.
C)  temperature.
D)  wavelength.E) A) and D)
F) C) and D) D

Question 13

A student pushes a book across a classroom table. Which of the following statements best explains the difference between the amount of force needed to start the book moving and the amount of force needed to keep it moving?

Accepted Answer

A)  Less force is needed to start the book moving, because there is less friction than when it is already moving.
B)  Less force is needed to start the book moving, because there is less potential energy in the table than in the book.
C)  More force is needed to start the book moving, because there is more potential energy in the table than in the book.
D)  More force is needed to start the book moving, because there is more friction than when it is already moving.E) C) and D)
F) A) and D)

Question 14

A racecar travels at an average speed of 80 m/s in a race. The total distance of the race is 640,000 m.
How long does it take the racecar to finish the race?

Accepted Answer

A)  800 s
B)  8,000 s
C)  6,400,000 s
D)  51,200,000 sE) A) and B)
F) All of the above

Question 15

To make ice, water must irst be cooled. The speciic heat of water is 4,186 J/kg • °C.
Approximately how much heat must be removed from 0.50 kg of water to change its temperature from 24°C to 5°C?

Accepted Answer

A)  0 J
B)  19,900 J
C)  39,800 J
D)  79,500 JE) B) and D)
F) C) and D) C

Question 16

Why does a plastic rod have a negative charge after being rubbed with a piece of fur?

Accepted Answer

A)  The fur gives up protons to the rod.
B)  The rod gives up electrons to the air.
C)  The fur gains protons from the rod.
D)  The rod gains electrons from the fur.E) A) and D)
F) B) and D) D

Question 17

Which of the following observations is a result of the Doppler effect?

Accepted Answer

A)  Noise from across a lake is louder at night than during the day
B)  A person walking notices that the pitch of a car's engine decreases as the car passes by.
C)  Beats are produced when two tuning forks with different frequencies are heard together.
D)  A person hears the sound from a radio more clearly in certain areas of a room than in others.E) All of the above
F) B) and D)

Question 18

Which of the following statements best describes the force of Earth's gravity on a rocket moving upward?

Accepted Answer

A)  The gravitational force is constant for all altitudes.
B)  The gravitational force is weaker when the rocket is higher.
C)  The gravitational force is stronger when the rocket is higher.
D)  The gravitational force is zero when the altitude is greater than 10,000 miles.E) B) and C)
F) None of the above

Question 19

Which of the following conditions results in the buildup of static charge on an object?

Accepted Answer

A)  when neutrons outnumber electrons
B)  when there are more protons than neutrons
C)  when there are more electrons than protons
D)  when all neutrons have been removed from the objectE) None of the above
F) A) and D)

Question 20

Two full 2 L bottles of water are placed on a table. Bottle 1 was just removed from a refrigerator; bottle 2 is at room temperature.
Which of the following statements describes the average molecular kinetic energy and the speed of the molecules in each bottle?

Accepted Answer

A)  Bottle 1 has the same average molecular kinetic energy as bottle 2, and the molecules have the same average speed in both bottles.
B)  Bottle 1 has a smaller average molecular kinetic energy than bottle 2, and the molecules have the same average speed in both bottles.
C)  Bottle 1 has a smaller average molecular kinetic energy than bottle 2, and the molecules have a slower average speed in bottle 1 than in bottle 2.
D)  Bottle 1 has a larger average molecular kinetic energy than bottle 2, and the molecules have a slower average speed in bottle 1 than in bottle 2.E) A) and D)
F) A) and C)

Exam 36: Praxis II Physics Content Knowledge

Two identical beakers each contain 250 mL of water. The temperature of the water is 85°C in one beaker and 15°C in the other beaker. A drop of red food coloring is placed in each beaker at the same time. During the irst minute, which of the following is most likely to happen?

Correct AnswerverifiedShow Answer

The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?

Correct AnswerverifiedShow Answer

Which of the following statements best explains why drops of liquid form on the outside of a glass of ice water on a hot day?

Correct AnswerverifiedShow Answer

The power of a toaster can be determined if which of the following values are known?

Correct AnswerverifiedShow Answer

What is the mass of an object weighing 63 N on Earth?

Correct AnswerverifiedShow Answer

A student swings a bat horizontally, making contact with a ball thrown to her. The ball leaves the bat, and the bat continues moving through the rest ofthe swing. Which of the following statements describes the change in energy ecessary to do work on the ball?

Correct AnswerverifiedShow Answer

A heated rock is placed in a container of water that is cooler than room temperature. Which of the following statements best describes what happens?

Correct AnswerverifiedShow Answer

A large container of cold water is moved from a refrigerator to a table. A hot piece of metal is placed into the water. Which of the following best describes the final temperature of the metal?

Correct AnswerverifiedShow Answer

A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill?

Correct AnswerverifiedShow Answer

Two oppositely charged objects are separated by a small distance. The objects are then moved three times farther apart from each other. Which of the following statements best describes what happens to the electrical force between the objects?

Correct AnswerverifiedShow Answer

How many meters is equivalent to 36.2 inches?

Correct AnswerverifiedShow Answer

Radio waves, visible light, and x-rays are examples of electromagnetic waves that always differ from each other in

Correct AnswerverifiedD

A student pushes a book across a classroom table. Which of the following statements best explains the difference between the amount of force needed to start the book moving and the amount of force needed to keep it moving?

Correct AnswerverifiedShow Answer

A racecar travels at an average speed of 80 m/s in a race. The total distance of the race is 640,000 m. How long does it take the racecar to finish the race?

Correct AnswerverifiedShow Answer

To make ice, water must irst be cooled. The speciic heat of water is 4,186 J/kg • °C. Approximately how much heat must be removed from 0.50 kg of water to change its temperature from 24°C to 5°C?

Correct AnswerverifiedC

Why does a plastic rod have a negative charge after being rubbed with a piece of fur?

Correct AnswerverifiedD

Which of the following observations is a result of the Doppler effect?

Correct AnswerverifiedShow Answer

Which of the following statements best describes the force of Earth's gravity on a rocket moving upward?

Correct AnswerverifiedShow Answer

Which of the following conditions results in the buildup of static charge on an object?

Correct AnswerverifiedShow Answer

Two full 2 L bottles of water are placed on a table. Bottle 1 was just removed from a refrigerator; bottle 2 is at room temperature. Which of the following statements describes the average molecular kinetic energy and the speed of the molecules in each bottle?

Correct AnswerverifiedShow Answer

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