General Science - Physics

Welcome to General Science – Physics MCQ series of GKToday. As of today February 26, 2020, this series has 590 Questions. You may purchase a PDF E-Book compilation comprising all these questions and their answers with explanation from this link.

81. Which of the following is true about the force between two point charges as per the Coulomb’s law?
[A] inversely as the square of the distance between the charges
[B] directly proportional to the product of the magnitude of the two charges
[C] Both a and b
[D] None of the above

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82. What is current density?
[A] Current per unit volume
[B] Current per unit area
[C] Charge per unit area
[D] None of the above

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83. How many electrons constitutes a 1 coulomb charge?
[A] 3 × 1016
[B] 6 × 1018
[C] 9 × 1021
[D] 1

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84. What is the equivalent internal resistance of a series combination of n cells?
[A] the arithmetic mean of their internal resistance
[B] the product of their individual internal resistance
[C] the sum of their individual internal resistance
[D] the sum of the reciprocal of their individual internal resistance

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85. What do we call the cell that requires an outside electrical source to drive the non-spontaneous redox reaction?
[A] Voltaic cell
[B] Electrolytic cell
[C] Galvanic cell
[D] None of the above

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86. What is the role of Salt bridge?
[A] allows the ions to flow from one half cell to another
[B] prevents the flow of solutions from one half cell to another
[C] Both a and b
[D] None of the above

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87. Which is the direction of magnetic field inside a magnet?
[A] from south pole to north pole
[B] from north pole to south pole
[C] from north pole till centre of the magnet
[D] None of the above

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88. Which of the following phenomenon is the basis of an electric generator?
[A] Electromagnetic Induction
[B] Ferroelectric effect
[C] Telluric currents
[D] Electroluminescence

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89. What is the net magnetic field in a solenoid?
[A] product of the fields due to all the turns
[B] equal to the field due to the largest turn
[C] vector sum of the fields due to all the turns
[D] arithmetic mean of the fields due to all the turns

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90. 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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