Daily Practice

13+ Common Entrance

30th November 1985

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

1
Chemistry: Reactions, Energy and Rates
In the disappearing cross experiment, a student times how long it takes for a cross under the flask to disappear from view. Explain why a shorter time indicates a faster reaction.
2
Chemistry: Metals, the Reactivity Series and Environmental Chemistry
A piece of magnesium ribbon is added to silver nitrate solution. State whether a displacement reaction would occur, and explain why.
3
Physics: Forces and Energy
In a tug of war, Team X pulls with a force of 640 N and Team Y pulls with a force of 590 N in the opposite direction. Calculate the resultant force acting on the rope.
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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