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.

81. What is the nature of image formed by a convex mirror when the object is placed at infinity?

[A] Real and inverted
[B] Virtual and erect
[C] Virtual and inverted
[D] Real and erect

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82. Which of the following mirrors is commonly used as rear-view mirror in a vehicle?

[A] Concave mirror
[B] Convex mirror
[C] Plain mirror
[D] None of the above

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83. Which of the following is the commercial unit of electric power?

[A] Joule
[B] KWh
[C] Watt
[D] Ampere

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84. What is the work done to move a unit charge from point to another called as?

[A] Current
[B] Resistance
[C] Conductance
[D] Potential Difference

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85. Which of the following metals is mostly used for filaments of electric bulbs?

[A] Copper
[B] Silver
[C] Nickel
[D] Tungsten

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86. Which of the following is true about metals?

[A] They are good conductors of electricity
[B] They have low resistivity
[C] Both a and b
[D] None of the above

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87. Which of the following represents the unit ampere?

[A] Kg/metre
[B] coulomb/metre
[C] coulomb/second
[D] Kg/coulomb

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88. On which of the following does the resistance of a conductor depend?

[A] Length
[B] Area of cross-section
[C] Nature of material
[D] All of the above

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89. What do we call the electrode that can be oxidized or reduced in half reaction?

[A] Inert electrode
[B] Active electrode
[C] Sleeping electrode
[D] Passive electrode

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90. Which of these is NOT a product of a fuel cell?

[A] Water
[B] Electricity
[C] Heat
[D] None of the above

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