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
C) Ceramic oxides
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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