Unit 9: Electrostatics and Current Electricity — Mcqs

11th Class Physics · Unit 9: Electrostatics and Current Electricity

0 of 0 answered 0 correct

Multiple Choice Questions

1.Two point charges A and B are separated by 10 m. If the distance between them is reduced to 5m, the force exerted on each:

2.Which electric charge is possible on a particle?

3.Which diagram best represents the electric field lines around two oppositely charged particles?

a [diagram showing diverging lines from both charges]
b [diagram showing radial field lines]
c [diagram showing field lines between charges]
d [diagram showing field lines connecting charges]

4.What is the work done on an electron by potential difference of 100 volts?

5.The potential at a point situated at a distance of 50 cm from a charge of 50 μC is:

6.A ball of weight 0.1 N having a charge of 100 μC remained suspended between two oppositely charged horizontal metal plates. The electric intensity between the plates is:

7.A piece of wire has resistance of 4Ω. It is doubled on itself so that its length becomes half but area of cross-section is doubled. Its resistance now will be:

8.The current through a conductor is 3.0 A when it is attached across a potential difference of 6.0 V. How much power is used?

9.The algebraic sum of potential changes for a complete circuit is zero. It is the statement of:

10.The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to:

SLO Based Additional MCQs + Past papers MCQs of Punjab Boards

Coulomb's law in dielectric

1.If air is replaced by any other dielectric medium the force of attraction or repulsion between two charges:

Dependence of value of K

2.Value of K depends upon:

Dielectric constant

3.Value of dielectric constant e_r for water is:

4.The relative permittivity of free space has the value equal to:

5.1.6 x 10^-19 J is always equal to:

6.The dielectric constant of rubber is:

7.When a dielectric material is placed in an electric field it:

8.The value of relative permittivity e_r for various dielectric is always:

Electric intensity

9.Unit of electric intensity is:

10.If we move away from a charge, the magnitude of electric intensity will:

11.The magnitude of electric intensity due to point charge is:

Electric flux

12.When area is neither perpendicular nor parallel to the field lines, then electric flux is:

13.Electric flux is a:

14.Unit of electric flux is:

15.Electric flux through a surface enclosing a charge is:

a qε₀
b ε₀/q₀
c ε₀q
d None

16.Flux passing through a closed surface does not depend upon:

Electric field line

17.A positive charge is placed at the center of sphere of radius r, then the electric flux depends upon:

18.Electric lines of force are:

19.For a positive charge electric field lines are directed:

20.Concept of field lines of force was introduced by:

21.The electric field present inside a hollow charged sphere is:

22.Neutral zone in electric field of two similar charges is region where:

23.A uniform electric field is represented by a set of lines which are:

Potential difference

24.The potential difference between two points in an electric field is:

25.On moving a charge of 20 Coulomb by 2cm, 2J of work is done, then the potential difference between the points is:

Potential gradient

26.The negative of potential gradient is:

27.The negative sign in the expression of potential gradient of E = - Δ V / Δ r shows that the direction of E is along the:

28.The potential gradient is a:

a Power
b Energy
c Scalar
d Vector

Electron volt

29.Electron-volt is a unit of:

30.1.6 x 10^-19 J is always equal to:

Electron force

31.The electrostatic force between two charges is 42N. If we place a dielectric of εr = 2.1 between the charges then the force become equal to:

32.The electric force of repulsion between two electrons at a distance of 1m is:

a 1.8 N
b 1.5 19^-9 N
c 2.30 10^-28 N
d 2.30 10^-27 N

33.Range of electric force is:

34.Electric force as compared to gravitational force is:

Resistivity

35.If the resistivity of a material is large, then it is:

36.Specific resistance of a conductor depends upon its:

37.The resistivity of a material in terms of its resistance R, Cross-sectional area 'A' and length 'L' is given by:

Conductivity

38.Which of the following metal has the lowest value of temperature coefficient of resistivity?

39.The SI unit of resistivity is:

40.The reciprocal of resistance is known as:

41.The SI unit of conductivity is:

Kirchhoff's rules

42.The sum of currents in various resistors meeting at a point of the circuit:

43.The Kirchhoff's first rule is the manifestation of law of conservation of:

44.The Kirchhoff's 2nd rule is the manifestation of law of conservation of:

45.Algebraic sum of current meeting at a point is zero is a statement of:

46.If a resistor is traversed in the direction of current, the potential change is:

47.If the source of e.m.f. is traversed from negative to positive terminal, the potential change is:

48.mho m^-1 is the SI unit of:

Potentiometer

49.The SI unit of conductance is:

a ohm
b ohm-meter
c mho
d mho-meter

50.A potentiometer can be used as to:-

51.The best instrument used for the accurate measurement of e.m.f. of a cell is:

52.Internal resistance and e.m.f. of a cell can be determined by an instrument:

Ohm's law

53.Ohm's law can be expressed as:

54.Electric bulb does not obey Ohm's law because:

55.Let an e.m.f. of 120V of negligible resistance connected across a resistance of 1000 ohms. Then the current flowing through the circuit is:

Electric power

56.Maximum power is delivered to a load when internal resistance of source is:

57.Which one of the following is correct?

a 1.0 MWh = 3.6 × 10^9 W
b 1.0 MWh = 3.6 × 10^6 W
c 1.0 MWh = 3.6 × 10^9 J
d 1.0 MWh = 3.6 × 10^9 J

58.Kilowatt-hour is the unit of:

Wheatstone bridge

59.In Wheatstone bridge all the four arms have equal resistance R. If the resistance of galvanometer arm is also R, the equivalent resistance of the combination is:

60.Wheatstone bridge is used to measure the unknown:

61.A Wheatstone bridge consists of ----- resistors.

Thermistor

62.If the source of e.m.f. is traversed from negative to positive terminal, the potential change is:

63.A heat sensitive resistor is called:

Vector area

64.The direction of vector area is:

65.If the vector area is parallel to the field lines, then electric flux is:

Gaussian surface

66.Gaussian surface is:

Electric Potential energy

67.If a charge is moved against the electric field, it will gain:

Electric field

68.The electric field created by positive point charge is:

69.An electric field can deflect:

Electric current

70.To eliminate stray electric field interference, circuits of sensitive electronic devices are enclosed in:

71.Current electricity is the branch of Physics which deals with electric charges:

72.The electric current may be caused due to:

e.m.f.

73.SI unit of EMF is:

74.Which electrical quantity has the same units as electromotive force?

75.Whenever current is drawn from a cell, its terminal potential difference and emf become:

Unit of energy

76.Which can be used as unit of energy?

Resistance

77.The electrical resistance of a metal:

78.The resistance of a wire is 8Ω, the wire is stretched to double of its original length then new resistance will be:

a 16Ω
b 24Ω
c 28Ω
d 32Ω

79.Which of the following has a positive temperature coefficient?

Open circuit

80.For an open circuit: