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] Freely suspended magnet always align in north-south direction
[B] Magnetic poles of a magnet are of equal strength
[C] Both a and b
[D] None of the above

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92. What is the susceptibility of a diamagnetic material?

[A] positive and small
[B] positive and large
[C] negative
[D] None

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93. What do we call the atomic species of the same element differing in mass?

[A] Isobars
[B] Isotopes
[C] Isomers
[D] Such species don’t exist

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94. Which of these rays have the highest ionising power?

[A] Alpha
[B] Beta
[C] Gamma
[D] All have the same

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95. When is a p-n diode said to be forward biased?

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

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96. 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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97. Which of the following is NOT the criteria for material selection for a solar cell?

[A] It should be cost effective
[B] It should have a band gap between 1.0 and 1.7 eV
[C] It should have low absorption coefficient
[D] All of the above

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98. What happens to the resistance of a p-n junction diode when forward biased?

[A] it becomes high
[B] No effect
[C] it becomes low
[D] it becomes zero

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99. What is the output of an AND gate when both the inputs are 0?

[A] 0
[B] 1
[C] Either 0 or 1
[D] 2

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

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

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