Month: March 2016

Waves,Sound & light


QUESTION 1 A diamond glitters in light because of its high refraction index of 2,42 and the small critical angle of the diamond-air boundary. 1. Calculate the critical angle of a diamond-air interface. Take the refraction index of air as 1. (4) The angle…

Work energy & power questions


Two stationary steel balls, A and B, are suspended next to each other by massless, inelastic strings as shown in Diagram 1 below. Ball A of mass 0,2 kg is displaced through a vertical distance of 0,2 m, as shown in Diagram 2 above….

GR 12 Activity


1.1. Two blocks of mass M kg and 2,5 kg respectively are connected by a light, inextensible string. The string runs over a light, frictionless pulley, as shown in the diagram below. The blocks are stationary. 1. State Newton’s THIRD law in words. (2)…

Gr12 test yourself


Ball A is projected vertically upwards at a velocity of 16 m∙s-1 from the ground. Ignore the effects of air resistance. Use the ground as zero reference. 1.Calculate the time taken by ball A to return to the ground.(2) 2.Sketch a velocity-time graph for…

Test yourself GR11


Consider the following molecules and answer the questions that follow. Consider the following molecules and answer the questions that follow. A.NH3 B.CO2 C.C2H2 D.H20 E.BH3 Which molecule: 1.1.1 Contains a triple bond? [1] 1.2 Is trigonal planar? [1] 1.3 Is angular in shape and…

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