Daily Practice

13+ Common Entrance

12th November 1990

5 questions · Years 7-8 · 744 questions in this band

1
Chemistry: Reactions, Energy and Rates
A reaction between magnesium ribbon and hydrochloric acid gives off heat, and the temperature of the acid rises from 20 degrees C to 35 degrees C. State whether this reaction is exothermic or endothermic, and explain how you know.
2
Chemistry: Metals, the Reactivity Series and Environmental Chemistry
State the method used to extract aluminium from its ore, and explain why this method is needed rather than reduction with carbon.
3
Physics: Forces and Energy
A parcel of mass 2.5 kg is lifted onto a shelf 2 m above the ground. Take g = 10 N/kg and use GPE = mass x g x height. Calculate the gain in gravitational potential energy.
4
Physics: Electricity, Magnetism and Waves
State one way, other than increasing the current, to increase the strength of an electromagnet made from a coil of wire around an iron core.
5
Physics: Light, Sound and Space
State why an astronaut in open space, far from any planet or star, cannot hear an explosion happening nearby.

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