Advanced level 2025 North West mock Physics 2
Advanced level 2025 North West mock Physics 2
OPTIONS
OPTION 1: ENERGY RESOURCES AND ENVIRONMENTAL PHYSICS
S. a) Define ihc following giving one example of each
i) functional energy
ii ) energy farming
Briefly explain why the sun is a renewable energy source although we cannot replace the energy given out by the sun
(5 marks)
b) A geothermal scheme is an important energy source in some countries.
i) State two advantages of a geothermal scheme over hydroelectric power
ii) Copy and complete the energy How diagram below‘ of a geothermal scheme by indicating what X, Y and Z stand
for. s
Internal energy of hot
rocks
X
>
Y \
A
f
Kinetic energy of
turbines
| Z | « . ! |
< |
c) i) A house is powered by 6 solar panels each measuring 120 cm by 75 cm. Given that the efficiency of the solar system is
38 %, and that the solar constant is 1.25 x 103 Wm‘2, determine the power supplied to the home. (5 marks)
OPTION 2: COMMUNICATION
9. a) Briefly explain why a mobile phone
i) is described as a transceiver
| ii) is also called a cell phone b) i) Draw a block diagram of a simple radio transmitter system |
. | (4 marks} |
| ii) Stale two reasons why there is a massive shift by broadcasters from analogue to digital transmission c) i) What is meant by “heterodyning” as used in radio transmission? |
(6 marks) |
| ii) A super heterodyne receiver has an .intermediate frequency of 11.5 MHz and covers the signal frequency range 86.0 | |
| MHz to 107.5 MHz Over what frequency range should the local oscillator be tuned? | (5 marks) |
OPTION 3:ELECTRONICS
10.a) Use the band theory to explain why
i) Copper is a good conductor of electricity
| ‘ ii) Germanium isa poorelectricalconductorat5°Cbut isa goodelectrical conductorat80°C b) for security reasons, an alarm is to be triggered if the gate of a house is left open at night. y i) What is the simplest logic gate that can be used to control the alarm? ii) Briefly describe the inputs and the output of the logic gate for proper functioning of the alarm |
| (4 marks) |
c) The figure below shows an NPN transistor in the common–emitter mode. The base current is 20 pA when the output
