Placement test A2 Level Physics V01

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Unit 1
 
Unit 1
1) A mass of 4.0 kg moves to the North with a speed of 3 m/s and strikes a 0.5 kg mass which initially stays at rest. The magnitude of the average force during the contact is 20 N. The 4.0 kg mass moves with a speed of 1.0 m/s to the North after the collision. What is the speed of the 0.5 kg mass after the collision?
8 m/s
16 m/s
24 m/s
32 m/s
64 m/s
2) A mass of 4.0 kg moves to the North with a speed of 3 m/s and strikes a 0.5 kg mass which initially stays at rest. The magnitude of the average force during the contact is 20 N. The 4.0 kg mass moves with a speed of 1 m/s to the North after the collision. What is the contact time between the two masses?
0.1 s
0.2 s
0.4 s
0.8 s
1.6 s
3) An object moves in a circular path with a constant radius of 25 m. The tangential acceleration of the object is uniformly at 0.25 m/s2. If the object’s initial speed is 2.5 m/s, what is the approximate speed of the object after it completes one round?
2.5 m/s
4.3 m/s
9.2 m/s
18.75 m/s
84.8 m/s
4) A ball with a mass of 3 kg is swung in a vertical circular path on a massless rope of length 5.0 m. What minimum speed at t the bottom of the swing allows the ball to travel one complete cycle? (Given g = 9.8 m/s2)
4.9 m/s
7.0 m/s
9.9 m/s
14.0 m/s
19.8 m/s
5) A 300-gram coin is tied with a string of a length of 40 cm and swung in a vertical circular motion. What is the magnitude of tension when the coin is at its lowest point and its speed is a constant of 6.0 m/s? (Given g = 10 m/s2)
2.8 N
4.0 N
7.5 N
24 N
30 N
6) An air conditioner is rated at 3.5 kW and reduces the temperature of flowing air from 37 °C to 22 °C. What is the mass of air passing through the conditioner in a time of 1.0 minutes? (specific heat capacity of air = 700 J⋅°C-1⋅kg-1; assume no heat is transferred to the surroundings; assume that there is no energy lost during this process)
20 g
33 g
333 g
3,000 g
20,000 g
7) How many of the following statements are INCORRECT?
  1. An object is floating in a vacuum chamber. When the rate of radiation emission is equal to the rate of radiation absorption; the object is at the same temperature as its surroundings.
  2. In a wood-fired pizza oven, the heat is transferred to the pizza only by convection.
  3. Using a curling iron to curl hair, most heat is transferred to the hair by conduction.
  4. If croissants are reheated in a microwave, most heat is transferred to the bread only by radiation.
0
1
2
3
4
8) The specific heat of water is 4,200 J/kg⋅K. How much heat is required to raise 5.0 kg of this water from 0˚C to 40˚C?
840 J
840 kJ
6,573 J
6,573 kJ
There is not enough information, the latent heat of fusion must be required.
9) A 1.5-km aluminium tube is heated up by 10˚C. What length does it stretch to if the aluminium thermal expansion coefficient is 23x10-6 K-1?
345 μm
345 mm
345 cm
345 m
345 km
 
Unit 2
 
Unit 2
1) Two point charges A and B are fixed at a distance of 30 cm apart. Charge A is of +2 nC and Charge B is of +1 nC. What is the magnitude of an electric field at the midpoint between them? (Given Coulomb's constant; k = 9x109 N/C)
20 nN
60 nN
200 nN
800 nN
1,200 nN
2) Four identical +3.0 C charges are placed at the vertices of a square whose side is 2.0 m long. Calculate the electrical potential energy of the charge system. (Given Coulomb's constant; k = 9x109 N/C)
0.57x1011 J
1.62x1011 J
2.19x1011 J
2.76x1011 J
4.38x1011 J
3) Two fixed charges +Q and +3Q are located D apart from each other. Find the minimum amount of work required to move another charge +Q from infinity to placed between them. (Let k be the Coulomb’s constant)
4) The electrical potential at point (x, y) on the xy-plane is given by V = 3 – 2x + 4y [V] where x and y are in metres. What is the electric field as the function of x and y?
5) A charge of +6.0 C enters an area with a uniform magnetic field; Given the charge's velocity;  What is the magnetic force acting on the charge?
–6.6 N
–4.2 N
0 N
+4.2 N
+6.6 N
6) A square wire of a side length of 20 cm conducts a current of 200 mA. What is the magnitude of the magnetic field at the centre of the square wire? (Given  = 2x10-7 Tm/A)
1.6x10-6 T
1.6x10-7 T
4.0x10-6 T
4.0x10-7 T
8.0x10-6 T
7) Charged particles of mass m and charge q, move with various speeds under the influence of an electric field of and a magnetic field of  Only the charges with speed v manage to stay in equilibrium. If E is now changed to 2E and B is now changed to 0.5B, what is the speed (v) of the charges that manage to stay in equilibrium?
0.25v
0.5v
v
2v
4v
8) Two 1.0-m parallel wires are separated by a distance of 5.0 mm. One wire has a current of 2.0 A through it. As a result, each of both wires is pushed away from each other with a force of 4x10-5 N. What is the current through the other wire? (Given  = 2x10-7 Tm/A)
0.5 A in the opposite direction
0.5 A in the same direction
5 A in the opposite direction
5 A in the same direction
0 A
9) A conducting triangular loop is placed as shown in the diagram below.
 

If there is a magnetic field of 10 mT to the positive z-direction through the loop, what is the magnetic flux through this loop?

5 μWb
6 μWb
7.5 μWb
10 μWb
12 μWb
 
Unit 3
 
Unit 3
1) 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
1
2
3
4
5
2) How many of the following statements are INCORRECT?
  1. The half-life of a radioactive sample is half the time taken for half of its nuclei to decay and it takes 2 half-lives for all nuclei to decay.
  2. Beta particles are ejected from the beta decay, which is essentially an electron from the valence shell of the atom.
  3. In an alpha decay process, the parent nuclide has four more neutrons than the daughter nuclide.
  4. Gamma particles move at the same speed as light in the vacuum.
0
1
2
3
4
3) How many of the following statements are CORRECT?
  1. The approximate error of linear momentum of an electron confined in an atom of size 1 angstrom is 10–24 kgm/s.
  2. The angular momentum of an electron in the first excited state of the hydrogen atom is 2 times that of the electron at the ground state.
  3. The energy of a 300-nm photon is 2 times the energy of a 600-nm photon.
  4. The cut-off frequency (threshold frequency) is directly proportional to the work function of the metal.
0
1
2
3
4
4) Consider the following.
  1. A neutrino is emitted.
  2. A proton is emitted.
  3. The mass number decreases by 1.
  4. The atomic number decreases by 1.

When an isotope undergoes a beta plus decay, how many of them would be expected?

0
1
2
3
4
5) A sample initially contains 8N and 2N atoms of radioactive isotopes X and Y, respectively. Both radioactive isotopes X and Y decay in a single stage into a stable isotope Z. If the isotopes X and Y have half-life of 13 minutes and 26 minutes, what is the ratio number of atoms of X: number of atoms of Y: number of atoms of Z in the sample 52 minutes later?
8 : 2 : 1
4 : 1 : 5
4 : 2 : 6
2 : 1 : 7
1 : 1 : 18
6) A radioactive substance loses 7/8 of its initial mass in 1.5 hours. What is approximately the half-life of this substance?
30 seconds
30 minutes
90 minutes
6 hours
more than 6 hours
7) Which of the following transitions of an electron in a hydrogen-like atom results in an emitted photon of the highest frequency?
From n = 1 to n = 2
From n = 2 to n = 1
From n = 3 to n = 4
From n = 4 to n = 3
From n = 5 to n = 4
8) Suppose the electron at the ground state of a hydrogen-like electron has a total energy of -10 eV. Which of the following is TRUE about the electron’s electrical potential energy (EPE) and kinetic energy (KE)?
EPE = 10 eV & KE = 10 eV
EPE = –10 eV & KE = –10 eV
EPE = –20 eV & KE = 10 eV
EPE = 20 eV & KE = –10 eV
EPE = 20 eV & KE = 10 eV
9) A nucleus undergoes alpha particle decay into .
Given that the atomic mass of is 226.025406u,
the atomic mass of is 222.017574u,
the atomic mass of  is 4.002603u,
and 1u = 931.5 MeV/c2.
 
What is the energy of the alpha particle that is emitted? (Assume that all energy from the radiation converts into kinetic energy of the alpha particle.)
4.871 MeV
3.728x103 MeV
1.461x109 MeV
4.384x1017 MeV
3.356x1020 MeV
 
Unit 4
 
Unit 4
1) The radius and mass of the Earth are 6.37x106 m and 5.97x1024 kg respectively. What is the minimum speed required to escape from the gravitational influence of the earth at the surface? (Given G = 6.67×10−11 Nm2∙kg−2)
9.8 m/s2
7,910 m/s
11,200 m/s
7,910 km/s
11,200 km/s
2) A satellite moving around the Earth in a circular orbit with a radius of 7.0×106 m. If the Earth's mass is about 6.0 × 1024 kg, what is the approximate period of the satellite to complete one revolution around the Earth? (Given G = 6.67×10−11 Nm2∙kg−2)
84 s
105 s
365 s
5,800 s
857,000 s
3) A comet orbits around a star in a uniform circular motion; the potential energy of the comet is U. If the star’s diameter is halved, but its density is doubled, what is the new potential energy of the same comet orbiting at the same orbital distance?
U
2U
4U
0.5U
0.25U
4) Astronomical Unit (AU) is the average distance between the centre of the Earth and the centre of the Sun: 1 AU = 1.5×1011 m. Light year (ly) is the distance that an electromagnetic wave travels in a year in a vacuum: ly = 9.46×1015 m. What is the time difference between when the light travels completely 1 ly and when the light travels completely 1 AU?
approximately 1 year
approximately 8,760 years
approximately 525,550 years
approximately 31,532,900 years
approximately 9.46×1015 years

 

5) A man is holding a pendulum swinging with a small angular amplitude. He enters an elevator that begins to accelerate downward—assuming that the acceleration is very smooth and the pendulum continues to swing without an interruption (same length and amplitude), which of the following is the most likely to happen?
The period of the pendulum increases.
The frequency of the pendulum increases.
The period of the pendulum remains the same.
The frequency of the pendulum remains the same.
No conclusion can be drawn without knowing the mass of the pendulum.
6) A pendulum consists of a mass  hanging from a string of length , the displacement equation of simple harmonic motion can be written by y(t) = Asin(ωt). How long will it take for the mass to move from y = 0 to y = ? (Let g be the gravitational acceleration)
7) A box of mass m is attached to a spring of a spring constant k that is hung vertically from the ceiling. Currently, the box is at rest in the equilibrium position. If the spring is pulled a further distance A from the equilibrium position and then released, what is its maximum speed of oscillation? (Let g be the gravitational acceleration)
8) The maximum speed of a simple harmonic motion is 0.25 m/s where the angular speed is 0.4 rad/s. What is the maximum acceleration of the motion?
0.0 m/s2
0.1 m/s2
0.2 m/s2
0.4 m/s2
0.8 m/s2
9) Hubble Space Telescope is a space telescope that is orbiting around Earth. Astronomers used data from the Hubble Telescope to discover the signatures of electromagnetic waves from planets, stars, and galaxies outside our solar system. If the light of wavelength λ is emitted from a star that is moving away from Earth, what happens to the intensity and the wavelength of the light detected by the Hubble Space Telescope as the star is moving away from Earth?
 

 

intensity

wavelength

1)

increases

increases from λ

2)

increases

increases to λ

3)

increases

decreases from λ

4)

increases

decreases to λ

5)

decreases

increases from λ

6)

decreases

increases to λ

7)

decreases

decreases from λ

8)

decreases

decreases to λ
1
2
3
4
5
6
7
8
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