PHY101 Final Term Past Papers Set 2

Spring 2009

Q1. The number of significant figures in 0.00150 is: (1 marks)

1. 5
2. 4
3. 3
4. 2

Q2. One revolution is the same as: (1 marks)

2π rad

1. 1 rad
2. 57 rad
3. π/2 rad
4. π rad
5. 2π rad

Q3. For a body to be in equilibrium under the combined action of several forces: (1 marks)

1. all the forces must be applied at the same point

all the forces must be applied at the same point

1. all of the forces form pairs of equal and opposite forces
2. any two of these forces must be balanced by a third force
3. the sum of the torques about any point must equal zero

Q4. A bucket of water is pushed from left to right with increasing speed across a horizontal surface. Consider the pressure at two points at the same level in the water. (1 marks)

1. It is the same
2. It is higher at the point on the left
3. It is higher at the point on the right
4. At first it is higher at the point on the left but as the bucket speeds up it is lower there

Q5. An organ pipe with both ends open is 0.85m long. Assuming that the speed of sound is 340m/s, the frequency of the third harmonic of this pipe is: (1 marks)

1. A. 200 Hz
2. B. 300 Hz
3. C. 400 Hz
4. D. 600 Hz

Q6. Capacitors C1 and C2 are connected in series. The equivalent capacitance is given by (1 marks)

1. C1C2/(C1 + C2)
2. (C1 + C2)/C1C2
3. 1/(C1 + C2)
4. C1/C2

Q7. If the potential difference across a resistor is doubled: (1 marks)

1. only the current is doubled
2. only the current is halved
3. only the resistance is doubled
4. only the resistance is halved

Q8. By using only two resistors, R1 and R2, a student is able to obtain resistances of 3 Ω, 4Ω, 12Ω, and 16 Ω. The values of R1 and R2 (in ohms) are: (1 marks)

1. 3, 4
2. 2, 12
3. 3, 16
4. 4, 12

Q9. Faraday's law states that an induced emf is proportional to: (1 marks)

1. the rate of change of the electric field
2. the rate of change of the magnetic flux
3. the rate of change of the electric flux
4. the rate of change of the magnetic field

Q10. A generator supplies 100V to the primary coil of a transformer. The primary has 50 turns and the secondary has 500 turns. The secondary voltage is: (1 marks)

1. 1000V
2. 500V
3. 250V
4. 100V

Q11. The wavelength of red light is 700 nm. Its frequency is ____________________. (1 marks)

1. 4.30 * 104 Hertz
2. 4.30 * 103 Hertz
3. 4.30 * 105 Hertz
4. 4.30 * 102 Hertz

Q12. In some movies, you sometimes see an actor looking in a mirror and you can see his face in the mirror. During the filming of this scene, what does the actor see in the mirror? (1 marks)

1. His face
2. Your face
3. The movie camera
4. The director's face

Q13. A laser in a compact disc player generates light that has a wavelength of 780 nm in air. The light then enters into the plastic of a CD. If the index of refraction of plastic is 1.55, the speed of this light once enter the plastic is ________. (1 marks)

1. 3.00 * 108 m/s
2. 1.94 * 108 m/s
3. 4.29 * 108 km/h
4. 3.00 * 108 km/h