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# Physics General Quiz

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Updated on Sep 27, 2011

## Physics General Quiz

This test has 30 multiple-choice questions covering the various topics in physics. Take as much time as you need to complete the posttest. When you are finished, check your answers with the answer key that follows.

1. The Great Wall of China is 3,946 miles long. Find the length in km.
1. 6.349 · 106 km
2. 6.349 · 103 m
3. 6.349 km
4. 6.349 · 103 km
2. A light-year (distance traveled by light in one year's time) is 9.46 · 1012 km. Convert this length to miles.
1. 5.87 · 109 miles
2. 5.87 · 1012 miles
3. 5.87 · 106 miles
4. 5.87 · 103 miles
3. The Farad (F) is a unit for capacitors, but it is an unusually large unit for usual capacitors. Convert a pF into F.
4. Light emitted by the sun takes 8.31 minutes to reach us at a speed of 3.00 · 108 m/s. Find the distance the light travels in that time.
1. 1.5 · 108m
2. 1.5 · 109m
3. 1.5 · 1011m
4. 1.5 · 1012m
5. You have measured the size of an object's diameter three different times, and you have the following values: 22.2, 22.7, and 23.4 cm. What is the average measurement expressed with the correct number of significant figures?
1. 22.5 cm
2. 23 cm
3. 22 cm
4. 22.8 cm
6. Write the following quantities in scientific notation:
55.5 mi/h; 149.6 · 106 km; 0.001408 kg/cm3; 286 · 1°
1. 5.55 102 mi/h; 1.496 · 108 km; 1.408 10–3 kg/cm3; 2.861 · 1020
2. 5.55 101 mi/h; 1.496 · 108 km; 1.408 10–3 kg/cm3; 2.861 · 1020
3. 5.55 101 mi/h; 1.496 · 108 km; 1.408 10–2 kg/cm3; 2.861 · 1020
4. 5.55 101 mi/h; 1.496 · 108 km; 1.408 10–3 kg/cm3; 2.861 · 1030
7. Perform the following additions to the correct number of significant figures:
25.22 + 0.0225 + 1,000.2 + 100 = ?; 1,234.56 + 0.02 = ?
1. 1,125.44; 1,234.6
2. 1,125; 1,234.58
3. 1,125.44; 1,234.58
4. 1,125; 1,235
8. Calculate the magnitude of the vector in each case. The first pair gives you the start point of the vector; the second pair is the tip: (0,0) and (3, –2); AND (0,0) and (–4,8).
1. 4 AND 9
2. 3 AND 9
3. 3 AND 8
4. 4 AND 8
9. The mass of the electron is 9,109.38188 . 10–35 kg. Write the mass in scientific notation.
1. 9.10938188 · 10–30 kg
2. 9.10938188 · 10–31 kg
3. 9.10938188 · 10–33 kg
4. 9.10938188 · 10–32 kg
10. Consider two objects acted on by the same force and their final accelerations are 2.50 m/s2 and 3.00 m/s2. If the mass of the first object is 1.25 kg, find the force and the mass of the second object.
1. 4.04 kg and 3.13 N
2. 1.04 kg and 4.13 N
3. 1.04 kg and 3.13 N
4. 1.04 Nand 3.13 kg
11. The acceleration of a 5.0 kg object is a = (15; 10) m/s2. Find the magnitude of the net force acting on the object.
1. 9N
2. 90N
3. 90 kg
4. 900 N
12. A car of mass 2,500 kg starts from rest and travels 8 m in 2 s. What are the values of the acceleration and of the net force assuming uniform acceleration?
1. 4 m/s2 and 10,000 N
2. 4 m/s and 10,000 N
3. 40 m/s2 and 10,000 N
4. 4 m/s2 and 1,000 N
13. A book is moved on a table with constant velocity. The book has a mass of 1 pound. Find the weight and the normal force in newtons.
1. W = 4.5N
2. W = N= 4.5N
3. N = 4.5N
4. W = 4.5 N and N = 0 N
14. For the system represented below, draw the free body diagram for each of the objects.
15. An object of 1,550 g mass moves on a surface with the coefficient of kinetic friction of 0.3230. Find the force of friction acting on the object
1. 50.06 kg
2. 50.06 N
3. 5.006 N
4. 5.006 kg
16. Two different objects have the same momentum but one object is three times smaller in mass than the other (m1 < m2). How do the two velocities compare? Consider one-dimensional motion.
1. m1/m2 = v2/v1 = 1/3
2. m1/m2 = v2/v1 = 3
3. m1/m2 = v1/v2 = 3
4. m2/m1 = v2/v1 = 1/3
17. Two objects of masses 40.0 and 4.00 kg collide elastically head on. Object 1 is at rest initially and the other one is moving at a speed of 1.50 m/s. After collision, the second object will recoil at a speed of 1.20 m/s. What is the speed of the heavy object? There is no external force acting on the system.
1. 27 m/s
2. 2.7 m/s
3. 0.27 m/s
4. 0.027 m/s
18. Consider a car collision in which one car is driving east at 18 mls speed and the other is moving north at 20 m/s. The cars are of similar mass, 1,500 kg. Find the velocity immediately after the collision if the collision is inelastic.
1. v = (9; 20) m/s
2. v = (18; 10) m/s
3. v = (18; 20) m/s
4. v = (9; 10) m/s
19. A car needs to be pushed for a short distance. You apply a force of 1,110 N and move it for about 1,080 cm. What is the work done?
1. 1.2 J
2. 1.2 · 104 J
3. 1.2 · 102 J
4. 1.2 · 106 J
20. An object is slowing down to a final speed two times smaller than the initial speed. What is the ratio of the final and initial kinetic energies?
1. 1/4
2. 1/2
3. 1/2
4. 1/16
21. An object at the end of a string is moved around in a circle of radius 80 cm. Between two close instances, the arc length is 10.0 cm, and the time is 0.2 s. Find the average angular speed of the object.
22. A force of 25,400 N is exerted on the 25 cm piston of a hydraulic press. Find the force needed to be applied on the 10 cm diameter for the press to be in equilibrium.
1. 4.1 · 101 N
2. 4.1 · 102 N
3. 4.1 · 103 N
4. 4.1 · 104 N
23. Find the value of 32° F in Kelvin degrees.
1. 0 K
2. 273.15 K
3. 100 K
4. 300 K
24. Water is boiling in a container in your kitchen. What is the temperature doing in the process?
1. remaining constant
2. increasing
3. decreasing
4. remaining at 0°
25. Consider the PV-diagram below. Find the work for the process.
1. 58 J
2. 5.8 J
3. 0 J
4. –58 J
26. How is the decrease of the distance between the two parallel plates of a capacitor affecting its capacitance?
1. decreasing
2. increasing
3. staying the same
4. capacitance becoming zero
27. A current is passed through a wire. What is the ratio of the magnetic fields produced at a distance of r and at 3 · r from the wire?
1. 1
2. 1/2
3. 1/3
4. 1/9
28. Determine the amplitude A of an oscillatory motion if the displacement is 12.0 em between times to = 0 seconds and time t = T/4, where T is the period of oscillations.
1. 24.0 em
2. 12.0 em
3. 6.0 em
4. 1.0 em
29. A microwave oven works based on microwaves that have wavelengths between 30 em and 10–3 m. Find the range of frequencies if the speed is 3 · 108 m/s.
1. 106 and 3 · l0ll Hz
2. 107 and 3 · l0ll Hz
3. 109and 3 · 109 Hz
4. 109 and 3 · l0ll Hz
30. Consider two sources emitting waves and two waves meeting in a region of space. The wave diagram is shown in the figure below. What is the result of the superposition of the two waves?
1. same frequency and amplitude
2. same frequency wave with amplitude two times larger
3. same amplitude wave with frequency two times larger
4. same frequency wave with amplitude four times larger

1. d. 6.349 · 103 km
2. b. 5.87 · 1012 miles
4. c. 1.5 · l011 m
5. d. 22.8 cm
6. b. 5.55 101 mi/h; 1.496 · 108 km; 1.408 · 10–3 kg/cm3; 2.861 · 1020
7. c. 1125.44; 1234.58
8. a. 4 and 9
9. d. 9.10938188 &3183; 1 0–32 kg
10. c. 1.04 kg and 3.13 N
11. b. 90 N
12. a. 4 m/s2 and 10,000 N
13. b. W = N = 4.5 N
14. d.
15. c. 5.006 N
16. a. m1/m2 = v2/v1 = 1/3
17. c. 0.27 m/s
18. d. v = (9; 10) mls
19. b. 1.2 · 104 J
20. a. 1.2 · 104 J
21. b. 6.2 . 10–2 rad/s
22. c. 4.1 . 103 N
23. b. 273.15 K
24. a. Is constant
25. d. – 58 J
26. a. Decreases
27. c. 1/3
28. b. 12.0 cm
29. d. 109 and 3 · l011 Hz
30. b. Same frequency wave with an amplitude two times larger

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