SciWebHop.net ks5 physics mcq exam database

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Finding the most difficult questions in the database based on the percentage of students who got it correct. A low percentage indicates the question is quite difficult. The questions are presented in order starting with the toughest. Some of them have come from the examiner comment. Note this only works for some questions since not all questions have ever been answered or mentioned in examiner comments. Some topic/keyword combinations will therefore yield zero results.

Finding the least difficult questions in the database based on the percentage of students who got it correct. A high percentage indicates the question is quite easy. The questions are presented in order starting with the easiest. Some of these have come from the examiner comment. Note this only works for some questions since not all questions have ever been answered or mentioned in examiner comments. Some topic/keyword combinations will therefore yield zero results.

A student is investigating the current in a circuit. The circuit is set up as shown

Resistors, each of resistance R, are connected in parallel between P and Q. The current I is measured. The experiment is repeated for different numbers n of resistors between P and Q.

It is suggested that I and n are related by the equation

where E is the electromotive force (e.m.f.) and r is the internal resistance of the power supply.

Values of n, I and 1/n are given

Determine the absolute uncertainties in 1/I / A^–1

A	0.5
B	0.03
C	2
D	0.06

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These questions may be suitable for students who are up to two years away from going to university.

[GCSE database]