Placement test IGCSE Physics V01
1) The magnitude of gravitational acceleration at the surface of Earth is approximately 9.81 m/s2. What is the approximate magnitude of the gravitational acceleration in kilometres per hour squared, km/h2?
0.756×10-3
0.589
2.72
35.3
1.27×105
2) An ultrasound scanner produces an ultrasound pulse with a speed of 1,600 m/s when it travels inside a human body. If the wave is reflected from a fetus 8 cm below the transmitter placed on a woman’s abdomen, how long does it take for the pulse to reach the receiver adjacent to the transmitter?
0.05 ms
0.1 ms
5 ms
10 ms
50 ms
3) Three forces are acting on a 0.2-kg object as shown in the figure below
Determine the acceleration of the object if the object moves with a constant velocity.
0 m/s2
3 m/s2
5 m/s2
15 m/s2
75 m/s2
4) A horizontal weightless spring scale is attached to two identical masses of 10 kg at both ends. What is the spring scale reading in kg?
0 kg
5 kg
10 kg
20 kg
5) A force of 50 N drags a box with a mass of 5.0 kg along a horizontal, frictionless, surface for a straight distance of 4.0 m. Then, it is dragged straight back to the starting point. What is the work done by the dragged force? (g = 10 m/s2)
–200 J
–100 J
0 J
100 J
200 J
6) A light bulb uses 750 J of electrical energy and produces 150 J of light energy. Calculate the efficiency of this light bulb.
5%
10%
20%
80%
90%
7) A rectangular box has a length of 2 m, a width of 3 m and a height of 4 m. If the box has a weight of 600 N, calculate the pressure on the base of the box.
0 Pa
25 Pa
50 Pa
75 Pa
100 Pa
8) How many of the following statements are correct?
- In a wood-fired pizza oven, the heat is transferred to the pizza only by convection.
- Using a curling iron to curl hair, most heat is transferred to the hair by conduction.
- If croissants are reheated in a microwave, most heat is transferred to the bread only by radiation.
0
1
2
3
9) A certain quantity of ideal gas has a volume of 60 cm3 at a pressure of 2.0 × 105 Pa. Find its volume when the pressure is 2.5 × 105 Pa. Assume the temperature remains constant.
27 cm3
35 cm3
48 cm3
75 cm3
92 cm3
10) Water is being boiled in an electric pot without a lid. At the moment, steam is being observed, if we increase the temperature of the pot, consider the following statements:
- The rate at which water turns into the stream increases
- The temperature of the water in the pot increases
- The water's specific latent heat of boiling increases
Which of these statements are true?
I only
III only
I and II only
II and III only
I, II and III
11) A string of guitar oscillates with a frequency of 692 Hz and produces sound. What is the wavelength of the sound, if the speed of sound in air is 346 m/s?
0.2 cm
0.5 cm
2.0 cm
20 cm
50 cm
12) The diagram shows a light ray striking a plane mirror at an angle of 30˚ to the surface of the mirror. The mirror is then rotated by 10˚ clockwise about an axis perpendicular to the plane of incidence.
What is the new angle of incidence, and through what angle does the reflected ray rotate?
|
angle of incidence after the mirror is rotated |
angle of rotation of the reflected ray |
|
|
1) |
10° |
60° |
|
2) |
10° |
70° |
|
3) |
20° |
60° |
|
4) |
20° |
70° |
|
5) |
30° |
70° |
1
2
3
4
5
13) An orange light ray with a wavelength of 620 nm passes from air into liquid. Its speed decreases by 25%. What are the wavelength and the colour of the light beam in the liquid?
155 nm and the light is invisible
465 nm and the light is blue
465 nm and the light is orange
827 nm and the light is orange
827 nm and the light is invisible
14) A sound passes from lighter medium A to dense medium B. Which of the following correctly describes the sound speeds vA and vB, and the frequencies fA and fB in these mediums?
vA < vB and fA = fB
vA > vB and fA = fB
vA = vB and fA < fB
vA = vB and fA > fB
vA = vB and fA = fB
15) Point P is located at the centre of the circular wire. Based on the diagram, which of the following correctly describes the magnetic field at Point P due to the magnet bar when the magnet bar is moving to the right?
To the right and increasing in magnitude
To the right and decreasing in magnitude
To the left and increasing in magnitude
To the left and decreasing in magnitude
To the left and constant magnitude
16) When object A is brought near object B, they attract each other. When object A is brought to touch object B, the objects still attract each other. Then, object A is grounded and becomes neutral. What would happen if we bring object A near object B again?
The objects will repel.
The objects will attract.
The objects will not repel or attract.
The objects will either repel or attract depending on the charge on object B.
Not enough information.
17) Two resistors of resistances 10 kΩ and 15 kΩ are connected in parallel to a 120-V battery. What is the electric current passing through the battery?
3.0 mA
4.8 mA
20 mA
4.8 A
20 A
18) An identical transformer is required to reduce the voltage of 220 V to only 40 V. The primary coil contains 154 coils. What is the number of secondary coils?
28
57
115
308
847
19) How many protons, neutrons and electrons are there inside a Palladium-108 nuclide (
)?
)?|
number of protons |
number of neutrons |
number of electrons |
|
|
1) |
46 |
62 |
0 |
|
2) |
46 |
108 |
46 |
|
3) |
62 |
46 |
0 |
|
4) |
62 |
108 |
62 |
|
5) |
108 |
46 |
0 |
|
6) |
108 |
62 |
108 |
1
2
3
4
5
6
20) A radioactive substance loses 7/8 of its initial mass in 1.5 hours. What is approximately the half-life of this substance?
30 second
30 minutes
90 minutes
6 hours
more than 6 hours
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