Answers TX-Physics BUnit Test

Unit Test — Cumulative exam Answers

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Which device converts kinetic energy into electrical energy?

an electric generator

an electric motor

a step-down transformer

a step-up transformer

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The table below shows the speed of sound waves from musical sound sources at 20°C.Which conclusion can be made based on the information in the table?

Wave speed and wavelengths can vary inversely to produce the same frequency.

Frequency and wave speed can vary directly to produce the same wavelength.

Wavelengths and frequency can vary inversely to produce the same wave speed.

Frequency and wavelengths can vary directly to produce the same wave speed.

_______interference occurs when two waves overlap and the resulting wave has a larger amplitude.

Destructive

Constructive

Reflection

Refraction

Which animals can hear a sound wave that has 18,500 cycles in 0.75 seconds? Check all that apply.

bats

moths

cats

humans

birds

fish

crickets

A point charge is used to determine the electric field around a charged particle. Why is it necessary that the point charge does not affect the position of the charge being tested?

The amount of charge will increase if the charged particle moves closer to the point charge, so any change in position changes the field.

The amount of charge will decrease if the charged particle moves closer to the point charge, so any change in position changes the field.

Electric fields are inversely proportional to the square of the distance, so any change in position changes the field.

Electric fields are directly proportional to distance, so any change in position changes the field.

Which change can make a generator stronger?

decreasing the size of the slip rings

increasing the size of the slip rings

decreasing the number of coils in the armature

increasing the number of coils in the armature

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.

No, the interfering waves will always be above X.

No, the interfering waves will always fall below X.

Yes, the overlap will occur during the slope of the waves.

Yes, the overlap will occur when the first wave hits point X.

A 40 W bulb is left on from 9:00 p.m. to 6:30 a.m.

0.10 kWh

0.38 kWh

100 kWh

380 kWh

The transverse wave shown has a wavelength of 1.5 m and is traveling in the x-direction.

0.13 seconds

0.67 seconds

2.0 seconds

8.0 seconds

A point charge of 6.8 C moves at 6.5 × 104 m/s at an angle of 15° to a magnetic field that has a field strength of 1.4 T.

1.6 × 10–1 N

6.0 × 10–1 N

1.6 × 105 N

6.0 × 105 N

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

moving the magnet faster

using more loops of wire in the coil

using the south pole of the magnet

connecting the galvanometer to the coil

Yellow light has a frequency of 5.2 × 1014 Hz and travels at a speed of 3.0 × 108 m/s. What is the wavelength of yellow light, in meters?

5.8 × 10–7 m

2.2 × 10–6 m

1.7 × 106 m

8.2 × 1022 m

Current X is 2.5 A and runs for 39 seconds. Current Y is 3.8 A and runs for 24 seconds.Which current delivered more charge, and how much more charge did it deliver?

X delivered 97.5 C more than Y.

X delivered 6.3 C more than Y.

Y delivered 91.2 C more than X.

Y delivered 1.3 C more than X.

The table lists the values of the constants used to calculate the electrical force and the gravitational force.

The electrical force is much smaller than the gravitational force because 8.99 is much greater than 6.67.

The electrical force is much larger than the gravitational force because 8.99 is much greater than 6.67.

The electrical force is much smaller than the gravitational force because 109 is much greater than 10–11.

The electrical force is much larger than the gravitational force because 109 is much greater than 10–11.

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

replacing the battery, because it is not providing current

installing new brushes, because they are not making a good connection

checking the commutator, because the current is not reversing

adding more wire coils in the armature, because the electromagnet is too weak

A 12.0 cm object is 9.0 cm from a convex mirror that has a focal length of -4.5 cm. What is the distance of the image from the mirror?

–3 cm

–4 cm

3 cm

4 cm

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

open

inverted

closed

short

Trina makes a diagram to summarize how to use the right-hand rule to determine the direction of the magnetic force on each type of charge.

X: Thumb, for velocityY: Fingers, for magnetic fieldZ: Palm of hand, for force

X: Back of hand, for forceY: Thumb, for velocityZ: Palm of hand, for force

X: Palm of hand, for forceY: Thumb, for velocityZ: Fingers, for magnetic field

X: Palm of hand, for forceY: Fingers, for magnetic fieldZ: Back of hand, for force

The diagram shows an image of an object being reflected off a plane mirror.

Lucas makes a graphic organizer to compare ways electrical energy is produced.

X: Uses turbines to turn generatorsY: Boils water to form steam

X: Boils water to form steamY: Uses turbines to turn generators

X: Uses uraniumY: Uses falling water to turn turbines

X: Uses generators to produce electrical energyY: Burns fuel to form steam

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Unit Test — Cumulative exam Answers

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