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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
How does the electrical resistance of a semiconductor change when it is heated?
A) It stays the same
B) It reduces
C) It rises
D) None of these
Option b – It reduces
In a semiconductor, electrical conduction occurs due to the movement of
A) Only electrons
B) Only holes
C) Both electrons and holes
D) Neither electrons nor holes
Option c – Both electrons and holes
What happens to the electrical resistance of a semiconductor at absolute zero temperature?
A) It becomes infinite
B) It becomes very small
C) It remains high
D) It becomes zero
Option a – It becomes infinite
Which of the following elements is used as a semiconductor material in transistors?
A) Copper
B) Germanium
C) Graphite
D) Silver
Option b – Germanium
Which material is most widely used in the manufacture of transistors?
A) Aluminium
B) Silicon
C) Silver
D) Copper
Option b – Silicon
Which of the following substances is an essential component in transistor Technology?
A) Arsenic
B) Germanium
C) Osmium
D) Radium
Option b – Germanium
What is the highest temperature achieved so far for superconductivity?
A) 24 K
B) 133 K
C) 150 K
D) 300 K
Option b – 133 K
Recently discovered high-temperature superconductors mainly belong to which category?
A) Metal alloys
C) Ceramic oxides
Option c – Ceramic oxides
Which of the following best describes a key property of superconductors?
A) Very high permeability
B) Very low permeability
C) Zero permeability
D) Infinite permeability
Option c – Zero permeability
At which temperature would superconductivity have the greatest economic impact by saving enormous energy costs?
A) At extremely low temperatures
B) At the temperature where a semiconductor turns superconducting
C) At room temperature
D) At very high temperatures
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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