General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

91. Which of the following is correct?

[A] The poles of a magnet always occur in pairs
[B] Like poles attract and unlike poles repel
[C] Both a and b
[D] None of the above

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92. Which of the following is NOT correct about the force of interaction between two poles of a magnet, as per coulomb’s law?

[A] directly proportional to the product of the pole strength
[B] directly proportional to the square of the distance r between the poles
[C] Both a and b
[D] None of the above

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93. What is the value of Planck’s constant?

[A] 6.6 × 10–34 J s
[B] 3.6 × 10–34 J s
[C] 6.6 × 10–24 J s
[D] 6.6 × 10–17 J s

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94. What is a p-n diode said to be in reverse-bias?

[A] positive terminal of the external battery is connected to the p-side
[B] positive terminal of the external battery is connected to the n-side
[C] negative terminal of the external battery is connected to the n-side
[D] None of the above

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95. What is the ratio of the change in collector current to the change in base current at a constant collector-emitter voltage, when the common emitter transistor is in active state, known as?

[A] Input resistance
[B] Output resistance
[C] Current amplification factor
[D] None of the above

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96. Which type of semiconductor do we get when pure silicon is doped with a group-3 element?

[A] n-type semiconductor
[B] p-type semiconductor
[C] Intrinsic semiconductor
[D] None

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97. What are the majority charge carriers in p-type semiconductors?

[A] electrons
[B] holes
[C] equal concentration of holes and electrons
[D] None of the above

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98. What is the charge of a p-type semiconductor?

[A] Positive
[B] Negative
[C] Neutral
[D] None of the above

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99. What is the barrier potential for Germanium?

[A] 0.3 V
[B] 0.7 V
[C] 1 V
[D] 1.7 V

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100. Which of these is used as a material for making semiconductor devices?

[A] Silicon
[B] Germanium
[C] Gallium Arsenide
[D] All of the above

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