Unit 2 Physics June 2014 IAL
Please choose one of the following options for each question:
1. Which of the following is a base SI quantity?
2. The diagram represents a circuit containing a cell of emf 1.5V and internal resistance of 0.20 in series with a resistor of resistance R. The current is 3.0 A.
What is the value of R?
A. 0.30 Ω
B. 0.50 Ω
C. 0.70 Ω
D. 1.8 Ω
3. A metal wire is heated while the potential difference across it remains constant.
The resistance of the wire increases because
A. the drift speed of the electrons increases..
B. the lattice atoms vibrate with greater amplitude.
C. there are fewer charge carriers per unit volume.
D. there are more charge carriers per unit volume.
4. Electrons are accelerated across a potential difference of 75 kV in an X-ray tube.
How much work is done on a single electron?
A. 2.1 × 10
B. 2.1 × 10
C. 1.2 × 10
D. 1.2 × 10
5. An electron pulse in an X-ray tube produces an average current of 3.0 mA for 0.5 s.
How much charge is transferred by this pulse?
A. 6.0 × 10
B. 1.5 × 10
C. 1.5 C
D. 6.0 C
6. A standing wave is created when two progressive waves travelling in opposite directions combine.
Select the line of the table which correctly indicates the phase difference between the progressive waves at X and the phase difference between the progressive waves at Y
7. Which of the following phenomena provides evidence that light waves are transverse?
8. The type of electromagnetic radiation used for mobile telephone transmissions is
A. gamma rays.
D. visible light.
9. Select the current-potential difference (I-V) graph that shows resistance increasing with increasing potential difference.
10. A student carries out an experiment to determine the resistivity of a wire of crosssectional area A. He measures the resistance R of the wire for different lengths l.
When plotted, which of the following graphs would give a gradient that could be used to calculate resistivity?