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Quiz 4
Mdcat-past-papers - DUHS - Physics Quiz
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Board: DUHS | Subject: Physics |
61. In equations E = -ΔV/Δx, Negative sign indicates that:
E points towards increasing V
E points towards decreasing V
E is perpendicular to V
E is parallel to ΔV
62. What does the electric field around a charge represent?
Size of the charge
Effective area for electrostatic force
Path followed by the charge
Speed of charge
63. Which statement is the best for electric flux of a point charge?
Independent of charge
Independent of medium
Independent of shape of surface in which charge is enclosed
Independent position of charge in shape
64. The change in electric potential with respect to distance equals to:
Potential gradient
Amount of the charge
Potential difference
Surface charge density
65. If 2μF and 4μF capacitors are connected in series. Their equivalent capacitance will be:
8μF
0.75μF
1.33μF
6μF
66. If a slab of dielectric constant εr = 2 is inserted between the parallel plates of a charged 20μF capacitor. Its capacitance will:
Remain the same
Be doubled
Be halved
Be four times
67. Two capacitors 6μF and 12μF are in series connected across a 200 volts D.C supply. Calculate the charges on each capacitor, respectively.
8 x 10⁻⁴C, 8 x 10⁻⁴C
8μC, 8Μc
8 x 10⁻⁶C, 16 x 10⁻⁶C
800C, 800C
68. The path of a neutron moving perpendicular to magnetic field is:
Curve
Straight line
Circle
Ellipse
69. A charged particle of mass "m" and charge "q" is projected in a magnetic field of induction B at an angle θ. The radius of curvature of its curved path is given by:
r = mv/qB
r = qB/mv
r = mv/qBsinθ
r = mv/qBcosθ
70. Which of the following defines the change in magnetic flux per unit area?
Magnetic field
Magnetic force
Magnetic dipole
Magnetic flux density
71. What is the dot product of magnetic induction and unit area?
Magnetic flux
Magnetic induction
Magnetic field
Magnetic pole
72. What does the magnetic flux measure in?
Area surrounded by a magnet
Strength of magnetic field
Rate of change of magnetic force
Number of magnetic lines of force
73. When magnetic field and vector area are perpendicular then magnetic flux will be:
Zero
Maximum
Minimum
Optimum
74. 1 eV is equal to:
1.602 × 10⁻¹⁹ J
16.02 × 10⁻¹⁹ J
1602 J
162.0 × 10⁻¹⁹ J
75. A proton of charge 1.6 × 10⁻¹⁹ C is moved through a potential difference of 20 V. The energy gained by the proton is:
-32 × 10⁻¹⁹ J
32 × 10⁻¹⁹ J
-32 × 10⁻¹⁸ J
32 × 10⁻¹⁸ J
76. A magnetic field exerts a force on a charged particle:
If the particle moving across the field lines
If the particle moving along the field lines
If the particle is at rest
Always experience force
77. A coil of 600 turns is threaded by magnetic flux of 8 webers. If this flux is reduced to 5 webers in 3 seconds. The induced EMF in the coil will be:
600V
700V
800V
900V
78. The mathematical equation representing Faraday's law is:
E = -N
E = N(Δ∅)/Δt
E = -N(Δ∅)/Δt
E = -(Δ∅)/Δt
79. For efficient transfer of electricity through cables over the long distance:
Both current and voltage must be low
The current must be low and voltage high
Both current and voltage must be high
The must be zero and current low
80. Lenz' law is a form of the:
Law of conservation of momentum
Law of conservation of charge
Law of conservation of angular momentum
Law of conservation of energy
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