Grade 12 Physical Science 2020 Paper 1
Question 10
An experiment is conducted to investigate the relationship between the frequency oflight incident on a metal and the maximum kinetic energy of the emitted electrons fromthe surface of the metal. This experiment is conducted for three different metals. The graph below represents the results obtained. 10.1 Name the phenomenon on which this experiment is based. … Read more
Question 9
9.1 A simplified diagram of an electrical machine is shown below. 9.1.1 Is this machine a DC motor or a DC generator? (1) 9.1.2 Write down the energy conversion that takes place while thismachine is in operation. (2) 9.1.3 Write down the name of component A in the diagram. (1) 9.1.4 In which direction will … Read more
Question 8
A battery with an internal resistance of 0,5 Ω and an unknown emf (ε) is connected tothree resistors, a high resistance voltmeter and an ammeter of negligible resistance, asshown in the circuit diagram below. 8.1 Define the term emf of a battery. (2) The reading on the voltmeter DECREASES by 1,5 V when switch S … Read more
Question 7
Two small charged spheres, A and B, are placed on insulated stands, 0,2 m apart, asshown in the diagram below. They carry charges of −4 x 10-6 C and +3 x 10-6 Crespectively. M is a point that is a distance of 0,1 m to the right of sphere B. 7.1 Calculate the number of … Read more
Question 6
The siren of a train, moving at a constant speed along a straight horizontal track, emitssound with a constant frequency. A detector, placed next to the track, records thefrequency of the sound waves. The results obtained are as shown in the graph below. 6.1 State the Doppler effect in words. (2) 6.2 Does the detector … Read more
Question 5
A roller-coaster car of mass 200 kg, with the engine switched off, travels alongtrack ABC which has a rough surface, as shown in the diagram below. At point A,which is 10 m above the ground, the speed of the car is 4 m·s-1. At point B, which is at a height h above the ground, … Read more
Question 4
Ball P of mass 0,16 kg, moving east at a speed of 10 m∙s-1 , collides head-on with another ball Q of mass 0,2kg, moving west at a speed of 15 m∙s-1 . After the collision, ball P moves west at a speed of 5 m∙s-1, as shown in the diagram below. Ignore the effects … Read more
Question 3
A small ball is dropped from a height of 2 m and bounces a few times after landing ona cement floor. Ignore air friction. The position-time graph below, not drawn to scale, represents the motion of the ball. 3.1 Define the term free fall. (2) 3.2 Use the graph and determine: 3.2.1 The time that … Read more
Question 2
A 20 kg block, resting on a rough horizontal surface, is connected to blocks P and Q bya light inextensible string moving over a frictionless pulley. Blocks P and Q are gluedtogether and have a combined mass of m. A force of 35 N is now applied to the 20 kg block at an angle … Read more