The resistance of light dependant resistance LDR:
Correct answer: B. Decreases with light
- A. Increases with light
- B. Decreases with light
- C. Decreases with darkness
- D. None of the above
Explanation
The correct answer is that the resistance of a Light Dependent Resistor (LDR) decreases with an increase in light intensity. This is because LDRs are designed to be sensitive to light, thus reducing their resistance as they are exposed to more light. Option A is incorrect because it states the opposite of what actually happens. Option C is misleading as it incorrectly suggests that resistance decreases in darkness, whereas it actually increases. Option D is incorrect as there is a correct statement among the options provided.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Electrical Properties of Solids
Electrical properties of solids depend on their band structure, charge carriers and conductivity. The topic compares conductors, insulators and semiconductors, relates resistivity to temperature, and covers intrinsic and extrinsic semiconductors, donor and acceptor impurities, electron and hole conduction, and the formation of p-type and n-type materials.
Practise Physics of Solids
320 free Physics of Solids MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Electrical Properties of Solids questions
The temperature at which the resistance of a conductor approaches zero is called
Metals are good conductors of electricity because they contain:
The resistance of the pure semiconductor decreases in a certain ratio with the?
Semi-conductor materials have:
In metals, why does electric conductivity decrease with the increase of temperature?