Home
Class 12
PHYSICS
Assertion: In vacuum tubes (vales), vacu...

Assertion: In vacuum tubes (vales), vacuum is necessary for the movement of electrons between electrods otherwise electrons collide with air and loss their energy.
Reason: In semiconductor devices, external heating or vacuum is not required.

A

If both the assertion and reason are true and reason is a true explantion of the assertion.

B

If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.

C

If the assertion is true but reason false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
B
In vacuum tubes, vacuum is necessary and the working of semiconductor device is independent of heating or vacuum.
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise AIPMT/NEET Questions|77 Videos

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise AIIMS Questions|38 Videos

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise Problems Based On Mixed Concepts|32 Videos

  • NUCLEAR PHYSICS

    A2Z|Exercise Section D - Chapter End Test|29 Videos

  • SOURCE AND EFFECT OF MAGNETIC FIELD

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

Assertion : The basic difference between various types of electromagnetic waves lies in their wavelength or frequencies Reason : Electromagnetic waves travel through vacuum with the same speed.

Assertion : The electrons in the conduction band have higher energy than those in the valence band of a semiconductor Reason : The conduction band lies above the energy gap and valence band lies below the energy gap.

An X-ray tube operating at 50kV converts 1% energy in the form of X-ray. If the amount of heat produced is 495 watt, then the number of electrons colliding with the target per second is

Assertion: Where a mole of electron is transported across a potential difference of 1V from positive electrode to negative electrode, then work done is -96500J . Reason: Work done due to transportation of electrons depends on the product of potential difference between the two points and amount to charge carried.

Products of electrolysis depend on the nature of material being electrlysed and the type of electrodes being used. If the electrode is inert (e.g., platinum or gold), it does not participate in the chemical reaction and acts only as source or sink for electrons. On the other hand, if the electrode is reactive, it participates in the electrode reaction. thus, the products of electrolysis may be different for reactive and inert electrodes. Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. In these question, a statement of assertion followed by a statement of reason. choose the correct answer out of the following choices. Q. Assertion (A): In a galvanic cell, chemical energy is converted into electrical energy. Reason (R): Redox reaction provide the chemical energy to the cell.

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the Coulomb attraction between the proton and the electrons. If a_(0) is the radius of the ground state orbit, m is the mass and e I sthe charge on the electron and is the permittivity of vacuum, the speed of the elctron is :

A2Z-SEMICONDUCTOR ELECTRONICS-Section B - Assertion Reasoning
  1. Assertion : An N-type semiconductor has a large number of electrons bu...

    Text Solution

    |

  2. Assertion : The crystalline solids have a sharp melting point. Reaso...

    Text Solution

    |

  3. Assertion: Silicon is preferred over germanium for making semiconducto...

    Text Solution

    |

  4. Assertion: Two P-N junction diodes placed back to back, will work as a...

    Text Solution

    |

  5. Assertion : In transistor common emitter mode as an amplifier is pref...

    Text Solution

    |

  6. Assertion:The dominant mechanism for motion of charge carriers in forw...

    Text Solution

    |

  7. Assertion: A transistor is a voltage-operating device. Reason: Base ...

    Text Solution

    |

  8. Assertion: NAND or NOR gates are called digital building blocks. Rea...

    Text Solution

    |

  9. Assertion: At 0K germanium is a superconductor. Reason: At 0K german...

    Text Solution

    |

  10. Assertion: Base in transistor is made very thin as compared to collect...

    Text Solution

    |

  11. Assertion: The current gain in common base circuit is always less than...

    Text Solution

    |

  12. Assertion: V-i charcteristic of P-N junction diode is same as that of ...

    Text Solution

    |

  13. Assertion: Zener diode works on a principle of of breakdown voltage. ...

    Text Solution

    |

  14. Assertion: NOT gate is also called inverter circuit. Reason: NOT gat...

    Text Solution

    |

  15. Assertion: In vacuum tubes (vales), vacuum is necessary for the moveme...

    Text Solution

    |

  16. Assertion: The following circuit represents 'OR' gate Reason: For...

    Text Solution

    |

  17. Assertion: A P-N photodiode is made from a semiconductor for which E(...

    Text Solution

    |

  18. Assertion: When PN-junction is forward biased then motion of charge ca...

    Text Solution

    |

  19. Assertion: De Morgan's theoram bar(A+B)=bar(A).bar(B) may be explained...

    Text Solution

    |

  20. Assertion: In the following circuit the potential drop across the resi...

    Text Solution

    |