PHY102 Past Question / Practice Questions

Question 1 The force exerted by charged particles on each other when they are at rest in a frame of reference is called ____ force ANS: electrostatic Question 2 ___ forces, hold electrons to nuclei, atoms and molecules together to give rise to bulk matter ANS: electromagnetic Question 3 There are ____ types of electric charges ANS: two Question 4 Two ebonite rods rubbed with fur and suspended from a rigid support close to each other by threads will ____ each other ANS: repel Question 5 Objects with net unlike charges __ each other ANS: attract Question 6 "A ___ is the amount of charge that flow through a cross-section of a wire in one second if there is a steady current of one ampere (I A) in the wire" ANS: coulomb Question 7 "The law of ____ of charge states that the total electric charge in an isolated system, that is, the algebraic sum of the positive and negative charge present at any time, does not change" ANS: conservation Question 8 If $Q_{1} and $Q_{2} are the magnitude of two charges and r the distance between them, ____'s law states that the electric force exerted by one charge on the other F is $F=k\frac{Q_{1}Q_{2} }{r^{2}}$, where k is a

constant

ANS: coulomb
Question 9 In the relation $k=\frac{1}{4\pi\epsilon_{o}}$, $\epsilon_{o}$ is the ______ of free space ANS: permittivity Question 10 "The electric field due to a distribution of charges, according to the ____ principle, is the vector sum of the fields of the individual charges making up the distribution" ANS: superposition Question 11 "The ____ at a point in space is defined as the electric force exerted on a test charge placed at that point" ANS: electric field Question 12 The flux of electric field through any cross-sectional area is maximum when the angle between the perpendicular to the surface and the direction of the field is ____ ANS: zero Question 13 The relation $\int\vec{E}\cdot{d}\vec{S}=\frac{\rho}{\epsilon_{o}}$, where S is the surface area and the other symbols have their usual meaning is an expression of ____' law ANS: gauss Question 14 "The ____ at a point in an electric field can be defined as the work done per unit charge moving from infinity to the point" ANS: electric potential Question 15 The unit 'joule per coulomb $ (JC^{-1})$ is also called the _____ ANS: volts PHY102_PRACTICE_SET2 Question 1
If the work per unit charge to bring a unit positive test- charge from infinity to any point on a surface is
constant, then the surface may be referred to as _____ surface ANS: equipotential surface Question 2

The work done by an external agent to move a test- charge from place to place in a direction perpendicular
to the field is _____ ANS: electric potential Question 3 The gradient of a scalar potential is a ____ quantity ANS: vector Question 4 The negative gradient of an electric potential equals ___________ ANS: electric field Question 5 An electrical insulator is also known as a ___ ANS: dielectric Question 6 "If E is the field strength (assumed uniform) and V is the p.d. between two parallel plates which are at a distance d apart, then If E is the field strength (assumed uniform) and V is the p.d. between the plates which are at a distance d apart, then V=____" ANS: ed Question 7 "A pair of equal and opposite charges, $\pm{q}$, separated by a vector distance $\vec\{a}$ is called an electric ____ called" ANS: dipole Question 8 In the equation C = Q/V, where the symbols have their usual meaning, the unit of C is called _______ ANS: farad Question 9 The quantity $\frac{1}{2}\epsilon_{o}E^{2}$ represents the electric ______
ANS: energy density Question 10 Two 2-$\mu{F}$ capacitors in series are in parallel with a 1-$\mu{F}$. The equivalent capacitance of the capacitors is ______ $\mu{F}$ ANS: 2 Question 11 "The maximum electric field a material can withstand without the occurrence of breakdown is called _____" ANS: dielectric strength Question 12 The unit of the quantity, $ 1/2 CV^{2}$, is _____ ANS: joules Question 13 "Inserting an dielectric between the plates of a capacitor ______ its capacitance ANS: increases Question 14 The figure shown is called _________

Question 15

The $\frac{1}{2} CV^{2}$ =\fracc{1}{2}\frac{Q^{2}}{C}$ represents the _______ stored in a capacitor ANS: energy PHY102_PRACTICE_SET4 Question 1 "When no other magnet is near, a freely suspended magnet sets so that the line joining its poles (i.e its magnet axis) is approximately parallel to the earth's _____ axis" ANS: north-south Question 2 In the right-handed screw (grip) rule, the thump (screw) points in the direction of the current while the fingers (rotation of the screw) circle in the direction of the ______ lines ANS: field Question 3

The equation $\delta{B}\alpha\frac{\delta{l}{sin\theta}}{r^{2}}$, where the symbols have their usual meaning, is a statement of _____ law ANS: Biot-savart Question 4 For two wires carrying current in the same direction, the magnetic force exerted on each other is ______ ANS: attractive Question 5 CRO is the short form of ______ ANS: cathode ray oscilloscope Question 6 In the equation $F = q\vec{E} + q \vec{v}\times{\vec{B}$, F is called the _____ force ANS: Lorentz force Question 7 In the equation $\vec{H}=\frac{\vce{B}}{\mu_{o}}- \vec{M}$, where the symbols have their usual meaning, the quantity $\vec{M}$ is the ______ ANS: magnetization Question 8 The induced e.m.f is directly proportional to the rate of change of flux linkage. This is the statement of _____'s law ANS: faraday Question 9 Lenz's law is an expression of the principle of conservation of _____ ANS: energy

NOTE: LENZ’S LAW STATES THAT The direction of the

induced e.m.f. is such that it tends to oppose the flux-change causing it, and does oppose it if induced current flows. Question 10 Electricity is transmitted at high voltages to avoid loss of power but are distributed at low voltages for domestic use using _____ transformers ANS: step-down
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