
Grade 9 Topics Part 2
Authored by S Frans
Physics
9th Grade
Used 3+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How is latent heat defined?
the thermal energy absorbed or emitted by unit mass during a change of state without a temperature change
the thermal energy absorbed or emitted by unit mass during unit temperature change
the thermal energy absorbed or emitted during a change of state without a temperature change
the thermal energy absorbed or emitted during unit temperature change
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In low-pressure hydrogen, there are no forces between the molecules except during collisions with each other.
Which statement describes the motion of a molecule between one collision and the next?
It moves with changing speed and continuously changes direction.
It moves with changing speed in a straight line.
It moves with constant speed and continuously changes direction.
It moves with constant speed in a straight line.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A gas is enclosed in a container of fixed volume.
The gas gains heat energy from an external source.
What happens to the molecules of the gas?
They expand.
They move faster inside the container.
They move further apart.
They vibrate with greater frequency.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A wave on water travels towards a stationary boat.
As the wave passes, the boat starts to move up and down and gains kinetic energy from the wave.
Which property of the wave changes as the wave passes the boat?
amplitude
frequency
speed
wavelength
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which waves are longitudinal?
gamma rays
light waves
ultrasound waves
X-rays
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An object is placed at a distance from a converging lens that is equal to twice the focal length of the lens.
Which statement about the image is correct?
It is enlarged.
It is inverted.
It is on the same side of the lens as the object.
It is virtual.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The lens in the diagram produces an image I of the object O.
Why is this not the ray diagram for a photographic enlarger?
The image is magnified.
The image is virtual.
The lens is converging lens.
The lens is too thin.
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