During the electrolysis of hydrochloric acid, positively charged hydrogen ions move towardsthe cathode at a rate of 1018 ions per second. Negatively charged chloride ions movetowards the anode at the…

The diagram shows a simplified version of the brake pedal of a car. A driver applies a force of 60N to the pedal. What force is applied to the piston?…

The equation summarises the reaction of copper and dilute nitric acid.qCu + rHNO3 → sCu(NO3)2 + 6H2O + tNO2What values of q, r, s and t are needed to balance…

The right-angled triangle shown has horizontal and vertical sides measuring (4 + √2) cm and(2 - √2) cm respectively. Calculate the area of the triangle. Answer: 2) B Area of…

The diagram shows a view from the front of a section through the heart and associated bloodvessels. Which sequence of numbers shows the course of blood flow from the point…

In triangle PQR<QPR = 60 <PQR = 45< QRP = 75RQ = 6 units Given that cos 60 is ½, find the length of side PR. (The diagram is not…

The enamel on teeth treated with fluorine may include fluoroapatite, which contains Ca^2+,PO4^3- and F^- ions. Which one of the following is a possible formula for fluoroapati Answer: 28) C…

A parachutist falls from an aircraft and reaches a terminal velocity. After a while he openshis parachute and reaches a new (lower) terminal velocity. Which graph shows how the air…

The bar charts X and Y show the concentration of five substances in the blood before andafter passing through two organs. What are the organs X and Y through which…

Simplify{[2x^3/2 y^3]/√Z}^2 Answer: 25) B Let us solve this question in portions. (2x^³⁄₂)² = 4x³ (y³)² = y⁶ (√z)² = z So the simplification would be: 4x³ y⁶   z