The diagram shows a section through the thorax. When breathing out (expiring), what happens to the muscles at X and Y and the pressure at Z? Answer: 6) E The…

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…