Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
l) The electrons in the last orbit of an atom are called electrons.
A) free
B) valence
C) bound
D) thermionic
Ans:B
2) If the number of valence electrons of an atom is less than 4, the substance is called
A) a conductor
B) a semiconductor
C) an insulator
D) a superconductor
Ans:A
3) If the number of valence electrons of an atom is more than 4, the substance is called
A) a semiconductor
B) a conductor
C) an insulator
D) a semi-insulator
Ans:C
4) If the number of valence electrons of an atom is exactly 4, then the substance is called
A) a semiconductor
B) a conductor
C) an insulator
D) a cryogenic conductor
Ans:A
5) If the number of valence electrons of an atom is less than 4, then the substance is probably
A) a metal
B) an insulator
C) a non-metal
D) a semiconductor
Ans:A
6) One coulomb of charge consists of electrons.
A) 624 ×10^16
B) 62.4 ×10^16
C) 6.24× 10^16
D) 0.624 × l0^16
Ans:A
7) A one cubic cm of copper has how many free electrons at room temperature?
A) 80 × 10^18
B) 8.5× 10^22
C) 20× 10^10
D) 50 × 10^20
Ans:B
8) Electronic current in a wire is the flow of electrons.
A) free
B) valence
C) bound
D) loose
Ans:A
9) Electromotive force in a circuit
A) causes free electron to flow
B) increases the circuit resistance
C) maintains circuit resistance
D) is needed to make the circuit complete
Ans:A
10) The resistance of a material is its area of cross-section.
A) directly proportional
B) independent of
C) inversely proportional to
D) equal to
Ans:C
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l) The electrons in the last orbit of an atom are called electrons.
A) free
B) valence
C) bound
D) thermionic
Ans:B
2) If the number of valence electrons of an atom is less than 4, the substance is called
A) a conductor
B) a semiconductor
C) an insulator
D) a superconductor
Ans:A
3) If the number of valence electrons of an atom is more than 4, the substance is called
A) a semiconductor
B) a conductor
C) an insulator
D) a semi-insulator
Ans:C
4) If the number of valence electrons of an atom is exactly 4, then the substance is called
A) a semiconductor
B) a conductor
C) an insulator
D) a cryogenic conductor
Ans:A
5) If the number of valence electrons of an atom is less than 4, then the substance is probably
A) a metal
B) an insulator
C) a non-metal
D) a semiconductor
Ans:A
6) One coulomb of charge consists of electrons.
A) 624 ×10^16
B) 62.4 ×10^16
C) 6.24× 10^16
D) 0.624 × l0^16
Ans:A
7) A one cubic cm of copper has how many free electrons at room temperature?
A) 80 × 10^18
B) 8.5× 10^22
C) 20× 10^10
D) 50 × 10^20
Ans:B
8) Electronic current in a wire is the flow of electrons.
A) free
B) valence
C) bound
D) loose
Ans:A
9) Electromotive force in a circuit
A) causes free electron to flow
B) increases the circuit resistance
C) maintains circuit resistance
D) is needed to make the circuit complete
Ans:A
10) The resistance of a material is its area of cross-section.
A) directly proportional
B) independent of
C) inversely proportional to
D) equal to
Ans:C
If you like my post please share it with your friends and subscribe to latest updates.. If you have doubts you can start new topic on forum and start discussion with our readers..
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