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mcqs of
,
1 : The electrostatic force of repulsion between two electrons at a distance 1m is:
1
:
2.3×10⁻³⁰ N
2
:
2.3×10⁻²⁸ N
3
:
2.3×10⁻²⁶ N
4
:
2.3×10⁻²⁴ N
2 : Presence of dielectric always:
1
:
Increases the electrostatic force
2
:
Reduces the electrostatic force
3
:
Does not affect the electrostatic force
4
:
Doubles the electrostatic force
3 : Two charges 1 µC and 5 µC separated by 20 cm, the ratio of electrical forces acting on them will be:
1
:
1:2
2
:
1:5
3
:
1:1
4
:
5:1
4 : The force between two similar unit charges placed one meter apart in air is:
1
:
Zero
2
:
One newton
3
:
9×10⁹ N
4
:
9×10⁻⁹ N
5 : Two oppositely charged balls A and B attract the third ball C when placed near them. Ball C must be:
1
:
Positively charged
2
:
Negatively charged
3
:
Electrically neutral
4
:
Charged positively or negatively
6 : A charge of 4 coulomb is in a field of intensity 4 N/C. The force on the charge is:
1
:
8 N
2
:
16 N
3
:
4 N
4
:
1 N
7 : If both the magnitude of charge and distance between them is doubled, the force will be:
1
:
Doubled
2
:
Halved
3
:
Remains same
4
:
One fourth
8 : Concept of electric field was given by:
1
:
Michelson
2
:
Henry
3
:
Michael Faraday
4
:
Oersted
9 : If F₁ and F₂ are forces acting on an α-particle and electron respectively in an electric field, then:
1
:
F₁ = F₂
2
:
F₁ < F₂
3
:
F₁ > F₂
4
:
F₁ = 4F₂
10 : The force between two charges is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges, the force reduces to:
1
:
25 N
2
:
20 N
3
:
15 N
4
:
10 N
11 : The electric field lines are closer where the field is:
1
:
Strong
2
:
Weak
3
:
Uniform
4
:
Variable
12 : Total flux through a closed surface depends on:
1
:
Shape of surface
2
:
Charge enclosed only
3
:
Medium only
4
:
Both charge and medium
13 : A charged conductor has charge on its:
1
:
Middle point
2
:
Surrounding space
3
:
Inner surface
4
:
Outer surface
14 : Electric flux is expressed as:
1
:
E × Q
2
:
E × A
3
:
EA²
4
:
E · A
15 : Equation φ = E·A is applicable to the surface:
1
:
Cylindrical
2
:
Conical
3
:
Flat
4
:
Spherical
16 : A particle carrying a charge of 2e falls through a potential difference of 3V. The energy acquired is:
1
:
1.5 eV
2
:
0.66 eV
3
:
6 eV
4
:
3 eV
17 : The work done in moving a positive charge on an equipotential surface is:
1
:
Finite and positive
2
:
Infinite
3
:
Finite and negative
4
:
Zero
18 : One electron volt is equal to:
1
:
6.25×10¹⁸ Joule
2
:
6.25×10⁻¹⁸ Joule
3
:
1.6×10⁻¹⁹ Joule
4
:
1.8×10 Joule
19 : If an electron is accelerated through a potential difference V, it will acquire energy:
1
:
Ve
2
:
V/2
3
:
e/2
4
:
Ve/2
20 : One joule is equal to:
1
:
1.6×10⁻¹⁹ eV
2
:
6.25×10¹⁸ eV
3
:
6.25×10⁻¹⁸ V
4
:
1.6×10⁻¹⁹ eV
21 : The absolute electric potential at a point 20 cm from a charge of 2µC is:
1
:
9×10² V
2
:
9×10³ V
3
:
9×10⁴ V
4
:
9×10⁰ V
22 : Which relation is correct?
1
:
Joule = volt × ampere
2
:
Joule = coulomb/volt
3
:
Joule = volt/ampere
4
:
Joule = coulomb × volt
23 : If an electron is accelerated through 10V potential difference, the energy gained is:
1
:
1.6×10⁻²⁰ J
2
:
10 eV
3
:
1.6 eV
4
:
1.8×10 V
24 : The gradient of a scalar field is always:
1
:
Scalar quantity
2
:
Vector quantity
3
:
Variable quantity
4
:
Fixed quantity
25 : The SI unit of electric potential is:
1
:
kg m² s⁻¹ C
2
:
kg m² s⁻² C
3
:
kg m² s⁻² C⁻¹
4
:
kg m² s²
26 : Potential difference between two plates is 100V with separation 5cm. The electric field gradient is:
1
:
2000 N/C
2
:
20 N/C
3
:
5000 N/C
4
:
0.05 N/C
27 : In metallic conductors, charge carriers are:
1
:
Protons
2
:
Positive and negative ions
3
:
Free electrons
4
:
Protons and electrons
28 : Charge carriers in electrolytes are:
1
:
Protons
2
:
Electrons
3
:
Holes
4
:
Positive and negative ions
29 : Current flows in gases due to:
1
:
Electrons only
2
:
Electrons and ions
3
:
Positive and negative ions
4
:
Electrons and holes
30 : A battery moves 40C charge in 20s. The current is:
1
:
2 A
2
:
0.5 A
3
:
80 A
4
:
60 A
31 : Ampere-second stands for:
1
:
Charge
2
:
EMF
3
:
Energy
4
:
Power
32 : Drift velocity of electrons is typically:
1
:
10⁻¹ m/s
2
:
10⁻² m/s
3
:
10⁻³ m/s
4
:
10⁻⁴ m/s
33 : Conventional current flows from:
1
:
Higher to lower potential
2
:
Lower to higher potential
3
:
Negative to positive terminal
4
:
Along equipotential surfaces
34 : If 1×10⁷ electrons pass through a conductor in 1.0 µs, the current is:
1
:
2 A
2
:
1.6 A
3
:
1.6×10⁻⁶ A
4
:
2.6×10⁻⁵ A
35 : 5A current flows for 2 minutes. The charge passed is:
1
:
500 C
2
:
600 C
3
:
400 C
4
:
10 C
36 : A battery moves 400C charge in 50s. The current is:
1
:
2 A
2
:
8 A
3
:
20 A
4
:
0.125 A
37 : If electric lines of force are equally spaced, the electric field is:
1
:
Uniform
2
:
Non-uniform
3
:
Weak
4
:
Strong
38 : The force on an electron in a field of 1×10⁸ N/C will be:
1
:
1.6×10⁻⁸ N
2
:
1.6×10⁻¹¹ N
3
:
1.6×10⁻¹⁹ N
4
:
1.8×10⁻²¹ N
39 : If the temperature of a conductor is increased, the product of resistivity and conductivity:
1
:
Increases
2
:
Decreases
3
:
Remains constant
4
:
May increase or decrease
40 : What is the color code for a 52 MΩ ±5% resistor?
1
:
Red Green Blue Gold
2
:
Green Red Blue Gold
3
:
Yellow Red Blue Gold
4
:
Green Red Violet Gold
41 : A wire of resistance R is cut into two equal parts. What happens to resistivity?
1
:
Doubles
2
:
Remains the same
3
:
Halves
4
:
Reduces to one-fourth
42 : The resistivity of a conductor increases with:
1
:
Increase in its length
2
:
Increase in its temperature
3
:
Increase in its area
4
:
Decrease in its length
43 : By increasing the temperature of a conductor, the flow rate of charge:
1
:
Increases
2
:
Remains constant
3
:
Changes exponentially
4
:
Decreases
44 : Maximum power is delivered to load resistance when internal resistance is:
1
:
r = ∞
2
:
r = R
3
:
r = 0
4
:
r = R/4
45 : An ideal current source has:
1
:
Zero resistance
2
:
Finite non-zero resistance
3
:
Infinite resistance
4
:
Situation-dependent resistance
46 : Potentiometer can be used as:
1
:
Ohm meter
2
:
Ammeter
3
:
Galvanometer
4
:
Potential divider
47 : Not an accurate potential measuring device:
1
:
Voltmeter
2
:
C.R.O
3
:
Potentiometer
4
:
Digital multimeter
48 : When distance between two charges is halved from 10m to 5m, force:
1
:
Halves
2
:
Doubles
3
:
Reduces to 1/4
4
:
Increases four times
49 : Minimum possible electric charge on a particle:
1
:
2.5 × 10⁻¹⁹ C
2
:
3.2 × 10⁻¹⁹ C
3
:
1.6 × 10⁻¹⁸ C
4
:
6.02 × 10²³ C
50 : The unit of electromotive force is:
1
:
Newton
2
:
Pascal
3
:
Volt
4
:
Ampere
51 : EMF is always present even when no current is drawn:
1
:
Zero
2
:
Present
3
:
Absent
4
:
Maximum
52 : Used to determine internal resistance of a cell:
1
:
Potentiometer
2
:
Wheatstone bridge
3
:
Ammeter
4
:
Voltmeter
53 : Work done on electron by 100V potential difference:
1
:
1.6 × 10⁻¹⁹ eV
2
:
1.6 × 10⁻¹⁷ eV
3
:
6.25 × 10⁻¹⁷ eV
4
:
100 eV
54 : Potential 50 cm from 50 μC charge:
1
:
9 × 10⁻⁴ V
2
:
18 × 10⁻⁴ V
3
:
9 × 10⁵ V
4
:
18 × 10⁴ V
55 : If the length of a conductor is doubled and its cross-sectional area is halved, its conductance will:
1
:
Increase four times
2
:
Become one-fourth
3
:
Become one-half
4
:
Remain unchanged
56 : Electric intensity for 0.1N ball with 100μC charge suspended between plates:
1
:
10 N/C
2
:
100 N/C
3
:
1000 N/C
4
:
10000 N/C
57 : Original 4Ω wire doubled on itself (length halved, area doubled):
1
:
8 Ω
2
:
4 Ω
3
:
2 Ω
4
:
1 Ω
58 : Power used by 3.0A current through 6.0V potential difference:
1
:
0.5 W
2
:
2.0 W
3
:
9.0 W
4
:
18 W
59 : Algebraic sum of potential changes around complete circuit is zero:
1
:
Ohm's law
2
:
Gauss's law
3
:
Kirchhoff's first law
4
:
Kirchhoff's second law
60 : When internal resistance equals load resistance, maximum power dissipated is:
1
:
E/(4r)
2
:
E²/(4r)
3
:
E/(4r²)
4
:
E²/(4r²)
61 : For a closed circuit:
1
:
E = V_terminal
2
:
E > V_terminal
3
:
E < V_terminal
4
:
E = V_terminal - Ir
62 : Kirchhoff's voltage rule states conservation of:
1
:
Energy
2
:
Momentum
3
:
Charge
4
:
Angular momentum
63 : Kirchhoff's first rule manifests conservation of:
1
:
Mass
2
:
Charge
3
:
Energy
4
:
Momentum
Physics 11th MCQs || Ilam Ghar
Chapter 9 : Electrostatics and Current Electricity
Physics 11th
