G10 Physics Chapter 4 - Revision Problems – Answer Key
Multiple Choice Questions.
Q1.
The potential energy in a spring is equal to ………..
a.
b.
c.
d.
One-half times the square of the spring constant and the square of the displacement.
One-half times the product of the force and the square of the displacement.
One-half times the product of the spring constant and the square of the displacement.
One-half times the product of the square of the force and displacement.
Q2.
What is the value of the spring constant of a spring with a potential energy of 8.67 J when it is
stretched 300 mm?
a.
b.
c.
d.
70.2 N/m
71.1 N/m
142 N/m
193 N/m
Q3.
What is the magnitude of the force acting on a spring with a spring constant of 300 N/m that is
stretched 15.3cm?
a.
b.
c.
d.
2.81 N
19.2 N
39.3 N
45.9 N
Q4.
Simple harmonic motion is defined as ………………………
a.
b.
c.
d.
motion in which the velocity acting to restore an object to its equilibrium position is directly
proportional to its displacement.
motion in which the force acting to restore an object to its equilibrium position is directly proportional
to its displacement.
motion in which the displacement acting to restore an object to its equilibrium position is inversely
proportional to its force.
motion in which the acceleration acting to restore an object to its equilibrium position is inversely
proportional to its displacement.
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Q5.
Determine the length of a pendulum that has a period of 3.52 seconds.
a.
b.
c.
d.
3.1 m
5.9 m
11.1 m
19.3 m
Q6.
Which of the following best describe transverse waves?
a.
b.
c.
d.
Oscillations that occur in line with the direction of wave travel.
Oscillations that occur opposite to the direction of wave travel.
Oscillations that occur perpendicular to the direction of wave travel.
Oscillations that occur parallel to the direction of wave travel.
Q7.
The graph below represents a wave. What do the numbers 1,2, and 3 represent?
a.
b.
c.
d.
1 = frequency, 2 = amplitude, 3 = wavelength
1 = amplitude, 2 = wavelength, 3 = frequency
1 = crest to trough, 2 = amplitude, 3 = wavelength
1 = amplitude, 2 = crest to trough, 3 = wavelength
Q8.
Wave speed can be calculated using the which equation?
a.
b.
c.
d.
v=fλ
v = λ /f
v = f/ λ
v = f/ λ 2
2
Q9.
Under which conditions are particles in a medium said to be in phase with one another?
a.
b.
c.
d.
When they have the same frequency from equilibrium position and the same wavelength.
When they have the same displacement from the equilibrium position and the same velocity .
When they have the same displacement from the equilibrium position but different velocities.
When they have the same frequency from the equilibrium position but different velocities.
Q10.
Which of the following best describe the frequency of a wave?
a.
b.
c.
d.
The number of half oscillations a point on a wave makes each minute
The number of half oscillations a point on a wave makes each second
The number of quarter oscillations a point on a wave makes each minute
The number of complete oscillations a point on a wave makes each second
Q11.
The diagram below shows two waves with equal but opposite displacements. What type of
interference is exhibited?
a.
b.
c.
d.
Horizontal
Destructive
Constructive
Antinode
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Q12.
Which characteristic(s) remain unchanged when a wave crosses a boundary into a different medium?
a.
b.
c.
d.
Frequency only
Frequency and amplitude only
Amplitude only
Amplitude and wavelength only
Q13.
When a wave changes direction as it passes from one medium to another is known as ___________.
a.
b.
c.
d.
Superposition
Reflection
Diffraction
Refraction
Q14.
How does a wave pulse reflected from a rigid wall differ from the incident pulse?
a.
b.
c.
d.
The relected pulse is exactly the same
The reflected pulse is longer
The reflected pulse is inverted
The reflected pulse is shorter
Q15.
If a standing wave is vibrating in four parts, there are points where it can be touched without
disturbing its motion (nodes). How many of these point exist?
a.
b.
c.
d.
2
3
4
5
4
Constructed Response Questions.
Q1
Hamdan shouts toward a vertical cliff 500 meters away from him. The echo is heard 3 seconds
later.
a.
What is the average speed of sound of Hamdan’s voice in air?
Using v = ∆d/∆t
Total distance is 500 x 2 = 1000 m
V = 1000/3 = 333 m/s
b.
The wavelength of the sound is 0.780 m. What is the frequency?
Using v = f λ we can rearrange to get f = v / λ
f = 333/0.780 = 427 Hz
c.
What is the period of the wave?
Using T = 1 / f we get 1 / 427 = 0.0023 s
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Q2
Wavefronts pass at an angle from one medium into a second medium, where they travel at a
different speed.
a.
Describe two changes in the wavefront.
The wavelength and direction of the wave fronts change due to refraction.
b.
What does not change?
The frequency does not change/remains the same.
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Grade 10 Physics Chapter 5 Revision Problems – Answer Key
Multiple Choice Questions.
Q1.
What type of wave is a sound wave?
a.
b.
c.
d.
Electromagnetic Wave
Longitudinal Wave
Transverse Wave
Ultraviolet Wave
Q2.
Which of the following best describes the distance from any point on a wave to the corresponding
point on the next wave?
a.
b.
c.
d.
Amplitude
Frequency
Wavelength
Wave Height
Q3.
The speed of sound, like all waves, depends on the _________________ through which it travels.
a.
b.
c.
d.
conductor
medium
object
vacuum
Q4.
The loudness (or intensity) of a sound wave is related to the ___________.
a.
b.
c.
d.
amplitude
frequency
temperature
wavelength
Q5.
The speed of sound in air depends on the _____________________ of the air.
a.
b.
c.
d.
amplitude
frequency
temperature
wavelength
1
Q6.
A person is at a concert moves away from the music speaker. The frequency observed by that person
________.
a.
b.
c.
d.
Q7.
a.
b.
c.
d.
Q8.
a.
b.
c.
d.
becomes zero
decreases
increases
stays the same
Which one of the following factors determines the pitch of a sound?
Amplitude
Distance of sound wave from the source
Frequency
Speed of the sound wave
For a musical instrument, the lowest frequency of sound that resonates is called the _____________.
fundamental
harmonic
overtone
resonance
Q9.
Calculate the wavelength of a soundwave of frequency 600 Hz travelling at 340 m/s.
a.
b.
c.
d.
Q10
a.
b.
c.
d.
0.56 m
1.29 m
450 m
149600 m
In order for two sound waves to produce audible beats, it is essential that the two waves have
______________.
the same amplitude
the same frequencies
the same number of overtones
slightly different frequencies
2
Q11
A car is moving away from a stationary siren which emits a sound frequency of 657 Hz. If the car is
moving at 20 m/s and the speed of sound in air is 343 m/s, what is the frequency of the sound heard by
the driver?
a.
b.
c.
d.
543 Hz
619 Hz
647 Hz
698 Hz
Q12
The diagrams above represent four different standing wave patterns in air columns of equal length.
Which of the columns will produce the note having the highest pitch?
a.
b.
c.
d.
Q13
a.
b.
c.
d.
A
B
C
D
You are in a car travelling at 24.6 m/s. A second car is moving toward you at the same speed. Its horn
emits a sound wave of 475 Hz. What frequency do you hear? Use 343 m/s as the speed of sound
80 Hz
150 Hz
250 Hz
548 Hz
Q14
Which of the following is an example of a open-pipe resonator?
a.
b.
c.
d.
Drums
Flute
Guitar
Piano
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Grade 10 Physics Chapter 6 Revision Problems – Answer Key
Multiple Choice Questions.
Q1.
Two point-charges are separated by distance r. The distance between them triples (x3). What happens
to the electrostatic force acting on each charge?
a.
b.
c.
d.
Increases by 3
Decreases by 1/3
Increases by 9
Decreases by 1/9
Q2.
Three rods made from different materials P, Q, and R, are charged by various methods. When the rods
are brought near each other, the rods P and Q repel each other, while the rods P and R attract each
other. Which of the following could be the signs of the charges on the rods?
Answers in order of: Rod P, Rod Q, Rod R.
a.
b.
c.
d.
Negative, Positive, Negative
Positive, Positive, Positive
Negative, Negative, Positive
Negative, Negative, Negative
Q3.
Electric forces can be either repulsive or attractive, whereas gravitational force is always _________.
a.
b.
c.
d.
attractive
repulsive
both attractive and repulsive
neither attractive nor repulsive
Q4.
What happens when a rubber rod is rubbed with a piece of fur to give it a negative charge?
a.
b.
c.
d.
Protons are removed from the rod.
Electrons are added to the rod.
Electrons are added to the fur.
The fur is left neutral
1
Q5.
A repelling force occurs between two charged objects when the charges are of ________ ________.
a.
b.
c.
d.
unlike signs
equal magnitude
like signs
unequal magnitude
Q6.
In which of the following is charge most easily transferred?
a.
b.
c.
d.
Q7.
a.
b.
c.
d.
Q8.
a.
b.
c.
d.
nonconductors.
semiconductors.
conductors.
insulators
Name the process of charging a conductor by bringing it near another charged object.
Conduction
Induction
Friction
Grounding
What occurs when two charges are moved closer together?
The force between the charges increases
The total charge increases.
Coulomb’s law takes effect.
The electric field doubles
Q9.
Insulators can by charged only by this method.
a.
b.
c.
d.
Induction
Conduction
Grounding
Friction
2
Q10
a.
b.
c.
d.
The electric field just outside a charged conductor in electrostatic equilibrium is _______________
zero
the same as it is in the center of the conductor
perpendicular to the conductor’s surface
at its minimum level
Q11
Materials, such as glass, plastic, and cloth, in which electric charges do not move freely are called
electrical ________________.
a.
b.
c.
d.
insulators
semiconductors
conductors
chargers
Q12
Sphere A, with a charge of +8.0 μC, is placed at a distance of 5.0 cm from another sphere B. The
charge on sphere B is -4.0 μC and is located to the right of sphere A. A third sphere C is placed 4.0
cm beneath sphere A. The charge on sphere C is +2.0 μC. Determine the net force on sphere A.
a.
b.
c.
d.
75 N
150 N
225 N
300 N
Q13
Which sentence best describes electrical conductors?
a.
b.
c.
d.
Electrical conductors have low mass density.
Electrical conductors have high tensile strength
Electrical conductors are poor heat conductors
Electrical conductors have electric charges that move freely
Q14
If the charge is tripled for two identical charges maintained at a constant separation, the electric force
between them will be changed by what factor?
a.
b.
c.
d.
9
18
3
6
3
Q15
a.
b.
c.
d.
Two equal charges are separated by 3.7  10 − 10 m. The force between the charges has a magnitude of
2.37  10 − 3 N. What is the magnitude of q on the charges? (kC = 8.99  10 9 N•m2/C2)
1.60  10 − 19 C
1.90  10 − 16 C
1.30  10 − 19 C
1.60  10 − 16 C
Constructed Response Questions.
Q1
Two like charged balloons, at a distance of 0.50 m apart, experience a repulsive force of 0.32
N. What is the force if the distance between the balloons is doubled?
The electrostatic force between two charged objects is given by:
F = KQ₁Q₂/r²
where
K is the Coulomb's constant
q1 and q2 are the charges of the two objects
r is the separation between the two objects
We see that the force is inversely proportional to the square of the distance: Therefore, if the
distance is doubled, the force decreases by a factor 4, and the new force will be:
F’ = F/4 = 0.32 N/4 = 0.08 N
and it will still be a repulsive force, since the two balloons have charges of same sign .
4
Q2.
Three-point charges as shown in the figure on the
right. What is the magnitude of force experienced by
Charge B?
(k = 9 x 10 9 Nm2C−2)
There are two forces acting on charge B, the force between charge A and B (FAB) and the force
between charge B and C (FBC). The force experienced by charge B is the net force of FAB and FBC.
Force between charge A and B:
Charge A signed positive and charge B signed positive so that F AB points to charge C.
Force between charge B and C:
Charge B signed positive and charge C signed positive so that FBC points to charge A.
Net force experienced by charge B:
FB = FBC – FAB = 180 – 90 = 90 N
The force experienced by charge B (FB) is 90 Newton. The direction of FB same as the direction of
FBC points to charge A.
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