Unit 2 Physics June 2013 (R)
Please choose one of the following options for each question:
1. Which type of electromagnetic radiation is used for communicating with satellites?
D. visible light
2. Which of the following current – potential difference (I–V) graphs shows the correct behaviour for a filament bulb?
3. A standing wave is created on a string stretched between two supports.
Which statement is always true?
A. There is a node at each end
B. There is a node in the centre.
C. There is an antinode at each end
D. There is an antinode in the centre
4. Light from a lamp passes through two polarising filters, P1 and P2, before reaching a detector. The filters initially have their planes of polarisation parallel.
The intensity of light at the detector will be greatest if
A.P1 is rotated by 45° and P2 is rotated by 315° in the same direction.
B.P1 is rotated by 90° and P2 is rotated by 270° in the same direction
C. P1 is rotated by 45° and P2 is rotated by 270° in the same direction
D. P1 is rotated by 90° and P2 is rotated by 315° in the same direction.
5. A beam of electrons is directed towards a section of crystalline material.
6. The diagram shows a uniform wire XY across which a potential difference V0 is applied.
Which of the following correctly shows the output potential difference across XZ?
7.When a semiconductor has its temperature increased from room temperature, its resistance usually decreases because
A. the electrons are moving faster.
B. the lattice atoms vibrate with greater amplitude.
C. the lattice atoms vibrate with smaller amplitude.
D. the number of charge carriers per unit volume increases.
8. Which of the following is a base SI unit?
9. Which term may be defined as the number of waves passing a point in one second?
A. wave speed
10. The diagram shows a displacement–distance graph at an instant for two waves, X and Y,
Which of the following statements correctly describes the phase relationship between the two waves?
A. X and Y are in antiphase
B. X and Y are in phase
C. X is Pi/2 radians ahead of Y
D. Y is Pi/2 radians ahead of X