Exams › NEET › Physics

Which of the following statements is correct?

1. (a) is true as in case of conductors either the conduction & valence band overlap or conduction band is partially filled.
2. (b) is true as insulators have energy gap of the order of 5 to 10 eV.
3. (c) is false as resistivity (opposite of conductivity) decreases with increase in temperature.
4. (d) is true as with increase in temperature more and more electrons jump to the conduction band. So, conductivity increases.

Correct answer: (b) is true as insulators have energy gap of the order of 5 to 10 eV.

Solution

Option B is correct because insulators typically have a large energy gap (5 to 10 eV) between the valence and conduction bands, which prevents electron flow under normal conditions.

Related NEET Physics questions

• Which of the following is unipolar transistor?
• Band gap in a semiconductor is of the order
• The transistor are usually made of
• Electric conduction in a semiconductor takes place due to
• The energy band diagrams for three semiconductor sample of silicon are shown. It follows that.
• A pure semiconductor at absolute zero has

⚔️ Practice NEET Physics free + battle 1v1 →