WorksheetsIAL Physics Unit 2 Revision
Total questions: 24
Worksheet time: 24mins
Name
Class
Date
1.
Laser light is shone through a diffraction grating so that a series of bright dots appears on a screen. Which is correct?
a)
The diffraction grating is set up so that it is parallel to the screen.
b)
The angle θ is measured using a protractor.
c)
The diffraction grating is set up so that it is parallel to the laser light beam.
d)
The distance between the bright dots is measured with a micrometer.
2.
Two copper wires are placed in series in a complete circuit. The electrons in the two wires have different values of drift velocity. Which of the following must be different for the two wires?
a)
current
b)
cross-sectional area
c)
charge carrier density
d)
length
3.
Waves can be represented on graphs of displacement against distance and displacement against time. Which of the following properties can only be determined by combining information from both graphs?
a)
amplitude
b)
speed
c)
frequency
d)
wavelength
4.
The equation I = nqvA relates the current in a sample of a material to the movement of free charge carriers in the sample. Which is correct?
a)
q represents the total charge stored in the sample.
b)
n represents the number of charge carriers in the sample.
c)
v represents the drift velocity of the charge carriers in the sample.
d)
A represents the surface area of the sample.
5.
A student investigates how different variables affect the speed of waves on a vibrating string. Which of the following would increase the speed of waves along the string?
a)
increasing the length of the string
b)
increasing the mass per unit length of the string
c)
increasing the frequency
d)
increasing the tension in the string
6.
The definitions for current and potential difference both include
a)
resistance.
b)
work done.
c)
time.
d)
charge.
7.
Ultrasound has a number of different uses in medicine. Which of the following is the main reason why ultrasound is not used to perform scans of the chest and lungs?
a)
The air in the lungs causes most of the ultrasound to be reflected back.
b)
The wavelength of the ultrasound is too long.
c)
The duration of the pulses of ultrasound limits the amount of detail that can be seen.
d)
Ultrasound can damage the lungs.
8.
The resistance of some electrical components decreases as the applied potential difference increases. Choose the correct pair.
a)
diode and ohmic conductor
b)
negative temperature coefficient thermistor and diode
c)
ohmic conductor and filament lamp
d)
filament lamp and negative temperature coefficient thermistor
9.
Ultrasound scans can be used to create an image of a patient's kidneys. For each ultrasound pulse sent into the body, a number of pulses are detected. Why are a number of pulses detected?
a)
Interference occurs when the pulse is in the body.
b)
The ultrasound has a very high frequency.
c)
The ultrasound has a very large wavelength.
d)
The ultrasound reflects off different layers within the body.
10.
Two copper wires of identical cross-sectional area are placed in series in a circuit. Which of the following could be different for the two wires?
a)
charge carrier density
b)
drift velocity
c)
potential difference
d)
current
11.
When a guitar string is plucked, a sound of constant frequency is heard. The wave produced on the vibrating guitar string is
a)
longitudinal and progressive.
b)
transverse and stationary.
c)
longitudinal and stationary.
d)
transverse and progressive.
12.
Which of the following statements about physical quantities or units is correct?
a)
Power is a derived quantity.
b)
The coulomb is a base unit.
c)
The volt is a base unit.
d)
Current is a derived quantity.
13.
Which of the following is an experimental observation of the photoelectric effect?
a)
Electrons are only released after light has been incident for a long time.
b)
Increasing the intensity of the light increases the maximum kinetic energy of the released electrons.
c)
Only light with a wavelength above a threshold value releases electrons.
d)
Increasing the frequency of the light increases the maximum kinetic energy of the released electrons.
14.
When the temperature of a metal wire increases, the resistance of the wire increases. Which of the following explains this increase in resistance?
a)
the number of conduction electrons increases
b)
the amplitude of the lattice vibrations decreases
c)
the number of conduction electrons decreases
d)
the amplitude of the lattice vibrations increases
15.
Which of the following has the largest de Broglie wavelength?
a)
an electron travelling at 4.0 × 10^5 m s^−1
b)
an electron travelling at 3.0 × 10^5 m s^−1
c)
a neutron travelling at 4.0 × 10^5 m s^−1
d)
a neutron travelling at 3.0 × 10^5 m s^−1
16.
As temperature increases, the resistance of a negative temperature coefficient thermistor changes. Which of the following describes the reason for this change?
a)
Collisions between electrons and ions occur less frequently.
b)
More conduction electrons are released.
c)
The ions in the thermistor vibrate more.
d)
The ions in the thermistor vibrate less.
17.
Which of the following can not be demonstrated in experiments using sound waves?
a)
diffraction
b)
superposition
c)
polarisation
d)
diffraction
18.
At a point in a circuit there is a current of 3.0 A. Which of the following gives the total charge passing this point in 2.0 minutes?
a)
0.025 C
b)
360 C
c)
1.5 C
d)
6.0 C
19.
Which of the following pairs of quantities could be used to calculate the speed of a wave?
a)
amplitude and frequency
b)
period and wavelength
c)
amplitude and wavelength
d)
period and frequency
20.
The number of conduction electrons in a light dependent resistor changes as light intensity increases.
a)
It increases because the electrons gain energy from the photons of light.
b)
It decreases because the lattice ions vibrate with a larger amplitude.
c)
It decreases because electrons are released due to the photoelectric effect.
d)
It increases because the lattice ions vibrate with a larger amplitude.
21.
Which of the following statements about waves is correct?
a)
Neither longitudinal nor transverse waves can be polarised.
b)
Both longitudinal and transverse waves can be polarised.
c)
Only longitudinal waves can be polarised.
d)
Only transverse waves can be polarised.
22.
Which of the following is an SI unit for electromotive force (e.m.f)?
a)
newton
b)
volt
c)
joule
d)
coulomb
23.
Which of the following describes the oscillations in polarised waves?
a)
in a single plane which is perpendicular to the direction of wave travel
b)
in many directions and parallel to the direction of wave travel
c)
in one direction and perpendicular to the direction of wave travel
d)
in many planes, which include the direction of wave travel
24.
The temperature of a thermistor is increased. What happens to the number of conduction electrons and the amplitude of lattice vibrations?
a)
decreased electrons, increased vibrations
b)
increased electrons, vibrations stay the same
c)
decreased electrons, vibrations stay the same
d)
increased electrons, increased vibrations
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