The substances like germanium and silicon have:
Correct answer: A. Negative temperature coefficients
- A. Negative temperature coefficients
- B. Positive temperature coefficients
- C. Both A and B
- D. None of the above
Explanation
Substances with a negative temperature coefficient of resistance, such as germanium and silicon, experience a decrease in resistance as temperature increases. This property is typical of semiconductors. Option A is correct. Option B describes metals, which have a positive temperature coefficient. Option C is incorrect because a material cannot simultaneously have both types of temperature coefficients. Option D is incorrect because germanium and silicon are correctly described by option A.
Last updated
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.
Exams that ask Physics questions like this
Physics is on 9 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
Aluminium is a ........
By increasing the temperature, the conductivity of the semiconductor is:
Carbon exists as allotropes, which are different crystalline or molecular forms of the same substance. Graphite and diamond are allotropes of carbon. Diamond is a non-conductor whereas graphite is a good conductor because:
Conductivity of a semiconductor material increases byI. increasing temperature.II. increasing the surface area.III. decreasing the density of charge carriers.IV. doping with small amounts of impurities.
Dark plastic handlers often used on kitchen utensils because: