Grade 12 Physical Science 2018 Paper 2
Question 11
The threshold frequencies of caesium and potassium metals are given in the tablebelow. 11.1 Define the term work function in words. (2) 11.2 Which ONE of the two metals in the table has the higher work function?Give a reason for the answer by referring to the information in the table. (2) The simplified diagrams below … Read more
Question 10
10.1 In the simplified AC generator below, the coil is rotated clockwise. 10.1.1 In which direction does the induced current flow in the coil?Choose from: X to Y or Y to X. (1) 10.1.2 On which principle or law is the working of the generator based? (1) 10.1.3 State the energy conversion that takes place … Read more
Question 9
Learners perform an experiment to determine the emf (ε) and the internal resistance (r)of a battery using the circuit below. 9.1 Which variable has to be kept constant in the experiment? (1) 9.2 Refer to the graph. 9.2.1 Write down the value of the internal resistance of the cell. (2) 9.2.2 Calculate the emf of … Read more
Question 8
The battery in the circuit diagram below has an emf of 12 V and an internal resistanceof 0,5 Ω. Resistor R has an unknown resistance. 8.1 What is the meaning of the following statement?The emf of the battery is 12 V. (2) The reading on the ammeter is 2 A when switch S is OPEN. … Read more
Question 7
Three small identical metal spheres, P, S and T, on insulated stands, are initiallyneutral. They are then charged to carry charges of -15 x 10-9 C, Q and +2 x 10-9 Crespectively, as shown below. The charged spheres are brought together so that all three spheres touch each otherat the same time, and are then … Read more
Question 6
The alarm of a vehicle parked next to a straight horizontal road goes off, emittingsound with a wavelength of 0,34 m. A patrol car is moving at a constant speed on thesame road. The driver of the patrol car hears a sound with a frequency of 50 Hz lowerthan the sound emitted by the alarm. … Read more
Question 5
The diagram below, not drawn to scale, shows a vehicle with a mass of 1 500 kgstarting from rest at point A at the bottom of a rough incline. Point B is 200 m verticallyabove the horizontal. The total work done by force F that moves the vehicle from point A to point B in … Read more
Question 4
4.1 Define the term momentum in words. (2) 4.2 Will the girl-roller-skate combination move TO THE RIGHT or TO THE LEFT after the parcel is thrown?NAME the law in physics that can be used to explain your choice of direction. (2) The total mass of the roller skates is 2 kg. 4.3 Calculate the mass … Read more
Question 3
In a competition, participants must attempt to throw a ball vertically upwards pastpoint T, marked on a tall vertical pole. Point T is 3,7 m above the ground. Point T may,or may not, be the highest point during the motion of the ball. One participant throws the ball vertically upwards at a velocity of 7,5 … Read more