Unit 2 Physics June 2015

Please choose one of the following options for each question:

1. The current filament lamp is 250mA.
How much charge flows through the lamp in 3 minutes





2. A source of sound of constant frequency is moving twoards an observer. Compared to the frequency of the source , the frequency of the sound heard by the observer is





3. A Radiation of frequency f and wavelength λ is emitted when an electrol falls from energy level E2 to energy level E1.
E2 to E1 is equal to:





4. Which of the following can be explained only by the wave nature of electromagnetic radiation?





5. The graph shows how potential difference V varies with current I for a circuit componenet

Which of the following could be the circuit component?





Questions 6 and 7 refer to the diagram below.

6. Which diagram shows the position of the nodes N and/or antinodes A?





7. The length of the string is 4 m.

What is the wavelength of the stationary wave?





8. Which of the following expresses the volt in SI base units?





9. A light illuminates a circular area of radius 30cm. In a time of 20s the total incident energy from the light is 70 J.

The radiation flux can be calculated from?





10. The diagram shows a potential divider circuit that contains a negative temperature coefficient thermistor.

The temperature of the room containing the circuit increases.
Select the row of the table that correctly shows the changes in readings on the meters.