Class 9 Science Chapter 8 MCQ

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Class 9 Science Chapter 8 MCQ. We covered all the Class 9 Science Chapter 8 MCQ in this post for free so that you can practice well for the exam.

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    Class 9 Science Chapter 8 Objective MCQ for Students

    The resistance of a semiconductor on heating

    A) Remains constant

    B) Decreases

    C) Increases

    D) None of the above

    Option b – Decreases

    Electric conduction in a semiconductor takes place due to

    A) Electrons only

    B) Holes only

    C) Both electrons and holes

    D) Neither electrons nor holes

    Option c – Both electrons and holes

    At absolute zero temperature, the electric resistance in a semiconductor is

    A) Infinite

    B) Meager

    C) High

    D) Zero

    Option a – Infinite

    Which one of the following metals is used as a semiconductor in transistors?

    A) Copper

    B) Germanium

    C) Graphite

    D) Silver

    Option b – Germanium

    The most commonly used material for making transistors is

    A) Aluminium

    B) Silicon

    C) Silver

    D) Copper

    Option b – Silicon

    Which of the following is an important component of a transistor?

    A) Arsenic

    B) Germanium

    C) Osmium

    D) Radium

    Option b – Germanium

    The highest temperature attained by a superconductor is

    A) 24 K

    B) 133 K

    C) 150 K

    D) 300 K

    Option b – 133 K

    The newly discovered high-temperature superconductors are

    A) Metal alloys

    B) Pure rare earth metals

    C) Ceramic oxides

    D) Inorganic polymers

    Option c – Ceramic oxides

    The characteristic of a superconductor is

    A) High permeability

    B) Low permeability

    C) Zero permeability

    D) Infinite permeability

    Option c – Zero permeability

    At which temperature can superconductivity be of tremendous economic interest, saving billions of rupees?

    A) At a very low temperature

    B) At a temperature when a semiconductor becomes a superconductor

    C) At room temperature

    D) At a very high temperature

    Option c – At room temperature

    We covered all the class 9 science chapter 8 mcq above in this post for free so that you can practice well for the exam.

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