12th class (Fsc) Physics unit 1 MCQs
76. If charged body is moved against the electric field, it will gain:
a. Mechanical energy
b. P.E
c. Electrical potential energy
d. K.E
77. The work done in bringing a unit positive charge from infinity to that point in an electric field is called:
a. Absolute potential
b. Potential
c. Potential difference
d. All of these
78. One electron volt is equal to:
a. 1.6 x 1019 joul
b. 1.6 x 10-19 joul
c. 1.6 x 10-19 joul
d. 1.6 x 1018 joul
79. The amount of energy equal to 1.6×10-19 J is called:
a. One electron volt
b. One volt
c. One mega electron volt
d. One milli volt
80. Charge on electron is:
a. 1.6 x 10-17 C
b. 1.6 X 1019 C
c. 1.6 X 1017 C
d. 1.6 X 10-19 C
81. A billion electrons are added to pith ball. Its charge is:
a. -1.6×10-14 C
b. -1.6×10-10 C
c. -1.6×10-7 C
d. -1.6×10-12 C
82. Electron volt is the unit of:
a. Electric current
b. Potential
c. Electric energy
d. Potential difference
83. In Millikan’s oil drop experiment of charged particle of mass ‘m’ is in equilibrium in an applied electric field E. if the direction of electric field is reversed then acceleration of the particle will be:
a. g
b. Zero
c. 2g
d. g/2
84. The product of resistance and capacitor:
a. Acceleration
b. Velocity
c. Time
d. Force
85. The slope of (q-t) curve at any instant of time gives:
a. Capacitance
b. Voltage
c. Inductance
d. Time
86. The capacitance of capacitor depends upon:
a. Voltage applied
b. Thickness of plates
c. Geometry of the capacitor
d. Charges on the plates
87. If time constant in RC series circuit is small, then capacitor is charged:
a. At constant rate
b. Slowly
c. Intermittently
d. Rapidly
88. If the separation between the plates of a capacitor is doubled then its capacitance become:
a. One fourth
b. Double
c. Three times
d. Half
89. Capacitance of a capacitor does not depend upon:
a. Electric field between plates
b. Distance between plates
c. Medium between plates
d. Area of plates
90. A capacitor is perfect for insulator is:
a. Eddy current
b. Alternating current
c. Direct current
d. Sparking current
91. Coulomb / volt is called:
a. Joule
b. Farad
c. Henry
d. Ampere
92. The capacitance of a parallel plate capacitor in vacuum is:
a. Cvac εnd/d
b. Cvac Aε₀/d
c. Cvac Aε₀εrd/d
d. Cvac Aε₀ε/d
93. Farad is defined as:
a. Coulomb/joule
b. Coulomb/volt
c. Volt/coulomb
d. Ampere/volt
94. The net charge on a capacitor (each, plate having magnitude of charge q) is:
a. q/2
b. Infinity
c. Zero
d. 2 q
95. Which material should be inserted between the plates of a capacitor in-order to increase its capacitance?
a. Iron
b. Copper
c. Tin
d. Mica
96. When a dielectric is placed between two charges then coulomb’s force will be:
a. Zero
b. Increased
c. Negative
d. Decreased
97. Presence of dielectric between two charges always:
a. Does not effect electric force
b. Reduces the electric force
c. Double the electric force
d. Enhances the electric force
98. If the potential difference across two plates of capacitor is doubled then energy stored in it will be:
a. Four times
b. Two times
c. Remain same
d. Eight times
99. Presence of dielectric always:
a. Does not effect
b. Increase the electrostatic force
c. Double the electrostatic force
d. Decrease the electrostatic force
100. Energy stored in the capacitor with dielectric is:
a. ε₀ A/d
b. 1/2εrε₀Ad
c. 1/2εrε₀E2
d. ε₀AE
101. A capacitor stores energy in the form of:
a. Electrical energy
b. Magnetic field
c. Mechanical energy
d. Heat energy
102. A capacitor of 50µF capacitance has P.D of 8 volt across its plates then charge on each plate of capacitor is:
a. 400C
b. 4 X 10-4c
c. 4 x 104c
d. 4 x 10-6c
103. In SI units the value of permittivity of free space ( ε₀ ) is:
a. 8.85×10-12N-1m-2C–2
b. 9×109Nm2C-2
c. 9X109N-1m2C-2
d. 8.85X10-12Nm2C-2
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