A sound wave is produced by a source placed a certain distance from a building as shown below. The echo reaches the source after 8 seconds. The speed of sound in air is 340 m·s-1. 7.1 Define the term longitudinal wave. (2) 7.2 Calculate the distance between the sound source and the building. (4) 7.3 … Read more
The diagram below represents a transverse wave produced by source A. 6.1 Define the term amplitude of a wave. (2) 6.2 Write down the amplitude, in metres, of this wave. (1) 6.3 Determine the period of this wave. (1) 6.4 Calculate the: 6.4.1 Speed of the wave if the wavelength is 0,8 m (5) 6.4.2 … Read more
A 2 kg ball rolls from rest from point A on a frictionless track ABCD, as shown below. The horizontal section, BC, of the track is 5 cm above the ground. The ball reaches point D, 30 cm above the ground, at a speed of 1,71 m∙s-1. 5.1 Write down ONE term for the following … Read more
The velocity-time graph below represents the motion of a car over a time period of 12 seconds. The car initially moves NORTH. 4.1 Define the term velocity. (2) 4.2 Describe the motion of the car from C to E. (3) 4.3 WITHOUT USING EQUATIONS OF MOTION, calculate the: 4.3.1 Distance that the car travels from … Read more
An aeroplane touches down on a runway at a velocity of 67 m·s-1, as illustrated below. After 30 seconds the velocity of the aeroplane is 8 m·s-1.The aeroplane then continues at a CONSTANT VELOCITY for a further 800 m before leaving the runway. The length of the runway is 2 000 m. 3.1 Define the … Read more
A boy walks in an EASTERLY direction, as shown below. After he passes a tree, he continues in the same direction for another 20 m. He then stops, climbs on his skateboard and rides in a WESTERLY direction for 25 m before he finally stops. The resultant displacement of the boy when he finally stops … Read more
Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1.1 Which ONE of the following physical quantities is a scalar quantity? A … Read more
The balanced chemical equation for the EXTRACTION of gold from its ore is as follows: 10.1 State ONE disadvantage of using cyanide (CN– ) in the extraction of gold. (1) 10.2 Will the final solution of the extraction process be ACIDIC or BASIC (ALKALINE)? Give a reason for the answer. (2) 10.3 Determine the oxidation … Read more
The unbalanced equations for two redox reactions, in which SO2 is involved, are shown below. 9.1 Explain what is meant by the term redox reaction. (2) 9.2 Write down the oxidation number of Mn in: 9.2.1 KMnO4 (1) 9.2.2 MnSO4 (1) 9.3 Is Mn in Reaction 2 OXIDISED or REDUCED? Give a reason for the … Read more
8.1 Consider the balanced equations for the reaction of water with nitric acid and ammonia below 8.1.1 Define an acid in terms of the Lowry-Brønsted theory. (2) 8.1.2 Write down the FORMULA of ONE conjugate acid-base pair in Reaction 1. (2) 8.1.3 Is the solution formed in Reaction 1 ACIDIC or BASIC (ALKALINE)? Give a … Read more