Home
Class 12
PHYSICS
In some substance charge can flow at ord...

In some substance charge can flow at ordinary temperature but not at very low temeratures. These are called

A

conductors

B

insulators

C

semiconductors

D

dielectrics

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTORS AND ELECTRONICS

    CHHAYA PUBLICATION|Exercise EXERCISE (Semiconductor diode )|1 Videos

  • SEMICONDUCTORS AND ELECTRONICS

    CHHAYA PUBLICATION|Exercise EXERCISE (Osillator )|1 Videos

  • SEMICONDUCTORS AND ELECTRONICS

    CHHAYA PUBLICATION|Exercise NCERT EXEMPLAR QUESTIONS WITH ANSWER HINT (Multiple Options Correct )|1 Videos

  • REFRACTION OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|11 Videos

Similar Questions

Explore conceptually related problems

which of the following favours the existence of a substance in the solid state ? a) High temperature b) Low temperature c) High thermal energy d) Weak cohesive forces

Fusion processes , like combining two deuterons to form a He nucleus are impossible at ordinary temperatures and pressure . The reasons for this can be traced to the fact

Explain from vander Waal's equation that at very low pressure and at very high temperature the real gases behave as an ideal gases.

What happens when a ferromagnetic substance is heated at very high temperature?

Food material can be preserved at (a) High temperature (b) Low temperature (c) Osmotic temperature (d) All the above.

Treatment of seed at low temperature under moist conditions to break its dormancy is called

[A] Eurythermic plants can withstand wide range of temperature . [R] : A plant that grows successfully at moderate temperature is called mesothermic .

Cryopreservation is 1. preservation of living being in chemicals 2. preservation through exposure to irradiation 3. preservation at very low temperature 4. preservation through use of gases

In has been estimated that the total energy radiated by the sun is 3.8xx10^26 J per second. The source of energy of stars is a thermonuclear reaction called nuclear fusion. Fusion reactions are not controlled. It is presumed that the energy of stars is due to two processes called proton-proton cycle and carbon nitrogen cycle. Fusion cannot take place at ordinary temperature. This, hydrogen bomb uses a small fission bomb, which on explosion causes the temperature to rise very high about 10^7 K. We have yet to see how a hydrogen bomb can be used for peaceful life-sustaining purpose. Energy released in the process of fusion is due to mass defect. It is also called Q-value. Q =Deltamc^2 , Deltam= mass defect Answer the following questions based on above passage: Fusion reaction takes place at about:

CHHAYA PUBLICATION-SEMICONDUCTORS AND ELECTRONICS -EXERCISE (Multiple Choice Questions )
  1. Two pieces of copper and germanium are cooled from room temperature to...

    Text Solution

    |

  2. For in intrinsic semiconductor the energy gap of forbidden zone is app...

    Text Solution

    |

  3. In a semiconducting material the mobilities of electrons and holes a...

    Text Solution

    |

  4. In some substance charge can flow at ordinary temperature but not at v...

    Text Solution

    |

  5. If a small amount of antimony is added to germanium crystal

    Text Solution

    |

  6. Pure Si at 500 K has equal number of electron (n(e)) and hole (n(h)) c...

    Text Solution

    |

  7. If a p-n junction diode is not connected in a circuit then

    Text Solution

    |

  8. In the circuit shown in Fig 1.54 the forward bias resistances of both ...

    Text Solution

    |

  9. When a p-n diode is reverse biased then

    Text Solution

    |

  10. The current through the given circuit of Fig .1.56.

    Text Solution

    |

  11. The impurity atoms that should be added to germenium to make it n-type...

    Text Solution

    |

  12. The circuit has two oppositely connected ideal diodes in parallel. Wha...

    Text Solution

    |

  13. When a p-n junction is reverse biased then

    Text Solution

    |

  14. A Zener diode having breakdown voltage equal to 15V,is used in a volta...

    Text Solution

    |

  15. If the rate of doping in the emitter base and colletor of a transistor...

    Text Solution

    |

  16. In the active region of a transistor the biasisng at the emitter-base ...

    Text Solution

    |

  17. A transistor is used as

    Text Solution

    |

  18. In an n-p-n transistor circuit collector current is 10 mA. If 90% of e...

    Text Solution

    |

  19. For a transistor if (DeltaI(C))/(DeltaI(E))=0.96 then the current gain...

    Text Solution

    |

  20. A transistor is operated in common-emitter configuration at V(C)=2 V ...

    Text Solution

    |