Download App

Physics M.C.Q (1 Marks)

Electric Current Through Conductors · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 44 questions.

Questions

M.C.Q (1 Marks)

Take a timed test

44 questions · 43 auto-graded MCQ + 1 self-marked written.

MCQ 11 Mark
Five dry cells each of voltage 1.5 V are connected as shown in diagram
Image
What is the overall voltage with this arrangement?
  • A
    0 V
  • ✓
    4.5 V
  • C
    6.0 V
  • D
    7.5 V
Answer
Correct option: B.
4.5 V
4.5 V
View full question & answer→
MCQ 21 Mark
100 cells each of emf 5 V and internal resistance 1 Ω are to be arranged so as to produce maximum current in a 25 Ω resistance. Each row contains equal number of cells. The number of rows should be
  • ✓
    2
  • B
    4
  • C
    5
  • D
    100
Answer
Correct option: A.
2
2
View full question & answer→
MCQ 31 Mark
The internal resistance of a cell of emf 2 V is 0.1 Ω, it is connected to a resistance of 0.9 Ω. The voltage across the cell will be
  • A
    0.5 V
  • ✓
    1.8 V
  • C
    1.95 V
  • D
    3V
Answer
Correct option: B.
1.8 V
1.8 V
View full question & answer→
MCQ 41 Mark
Masses of three pieces of wires made of the same metal are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1. The ratios of their resistances are
  • A
    1 : 3 : 5
  • B
    5 : 3 : 1
  • C
    1 : 15 : 125
  • ✓
    125 : 15 : 1
Answer
Correct option: D.
125 : 15 : 1
125 : 15 : 1
View full question & answer→
MCQ 51 Mark
The wire of length L and resistance R is stretched so that its radius of cross-section is halved. What is its new resistance?
  • A
    5R
  • B
    8R
  • C
    4R
  • ✓
    16R
Answer
Correct option: D.
16R
16R
View full question & answer→
MCQ 61 Mark
A rheostat is used
  • A
    to bring on a known change of resistance in the circuit to alter the current.
  • ✓
    to continuously change the resistance in any arbitrary manner and there by alter the current.
  • C
    to make and break the circuit at any instant.
  • D
    neither to alter the resistance nor the current.
Answer
Correct option: B.
to continuously change the resistance in any arbitrary manner and there by alter the current.
View full question & answer→
MCQ 71 Mark
Which of the following is an ohmic conductor?
  • A
    transistor
  • B
    vacuum tube
  • C
    electrolyte
  • ✓
    nichrome wire
Answer
Correct option: D.
nichrome wire
View full question & answer→
MCQ 81 Mark
You are given four bulbs of 25 W, 40 W, 60 W, and 100 W of power, all operating at 230 V. Which of them has the lowest resistance?
  • A
    25 W
  • B
    40 W
  • C
    60 W
  • ✓
    100 W
Answer
Correct option: D.
100 W
100 W
View full question & answer→
MCQ 91 Mark
A 100 W, 200 V bulb is connected to a 160 volt supply. The actual’ power consumption would be
  • ✓
    64 W
  • B
    125 W
  • C
    100 W
  • D
    80 W
Answer
Correct option: A.
64 W
64 W
View full question & answer→
MCQ 101 Mark
The terminal voltage across a cell is more than its e.m.f., if another cell of
  • ✓
    higher e.m.f. is connected parallel to it.
  • B
    less e.m.f. is connected parallel to it.
  • C
    less e.m.f. is connected in series with it.
  • D
    higher e.m.f. is connected in series with it.
Answer
Correct option: A.
higher e.m.f. is connected parallel to it.
higher e.m.f. is connected parallel to it.
View full question & answer→
MCQ 111 Mark
In a series combination of cells, the effective internal resistance will
  • A
    remain the same.
  • B
    decrease.
  • ✓
    increase.
  • D
    be half that of the 1st cell.
Answer
Correct option: C.
increase.
increase.
View full question & answer→
MCQ 121 Mark
A potential difference of 20 V is applied across the ends of a coil. The amount of heat generated in it is 800 cal/s. The value of resistance of the coil will be
  • A
    $12 \Omega$
  • B
    $1.2 \Omega$
  • ✓
    $0.12 \Omega$
  • D
    $0.012 \Omega$
Answer
Correct option: C.
$0.12 \Omega$
$0.12 \Omega$
View full question & answer→
MCQ 131 Mark
Three resistors, $8 \Omega, 4 \Omega$ and $10 \Omega$ connected in parallel as shown in figure, the equivalent resistance is
Image
  • A
    $\frac{19}{40} \Omega$
  • ✓
    $\frac{40}{19} \Omega$
  • C
    $\frac{80}{19} \Omega$
  • D
    $\frac{34}{23} \Omega$
Answer
Correct option: B.
$\frac{40}{19} \Omega$
$\frac{40}{19} \Omega$
View full question & answer→
MCQ 141 Mark
The emf of a cell is 12 V. When it sends a current of 1 A through an external resistance, the p.d. across the terminals reduces to 10 V. The internal resistance of the cell is
  • A
    $0.1 \Omega$
  • B
    $0.5 \Omega$
  • C
    $1 \Omega$
  • ✓
    $2 \Omega$
Answer
Correct option: D.
$2 \Omega$
$2 \Omega$
View full question & answer→
MCQ 151 Mark
The internal resistance of a cell of emf 2 V is $0.1 \Omega$. It is connected to a resistance of $3.9 \Omega$. The voltage across the cell will be
  • A
    0.5 V
  • B
    1.5 V
  • ✓
    1.95 V
  • D
    2 V
Answer
Correct option: C.
1.95 V
1.95 V
View full question & answer→
MCQ 161 Mark
A hall is used 5 hours a day for 25 days in a month. It has 6 lamps of 100 W each and 4 fans of 150 W. The total energy consumed for the month is
  • A
    500 kWh
  • ✓
    150 kWh
  • C
    15 kWh
  • D
    1.5 kWh
Answer
Correct option: B.
150 kWh
150 kWh
View full question & answer→
MCQ 171 Mark
If a battery of emf 2 V with internal resistance one ohm is connected to an external circuit of resistance R across it, then the terminal p.d. becomes 1.5 V. The value of R is
  • A
    $1 \Omega$
  • B
    $1.5 \Omega$
  • C
    $2 \Omega$
  • ✓
    $3 \Omega$
Answer
Correct option: D.
$3 \Omega$
$3 \Omega$
View full question & answer→
MCQ 181 Mark
The terminal voltage of a cell of emf E on short circuiting will be
  • A
    E
  • B
    $\frac{E}{2}$
  • C
    2E
  • ✓
    zero
Answer
Correct option: D.
zero
zero
View full question & answer→
MCQ 191 Mark
A strip of copper, another of germanium are cooled from room temperature to 80 K. The resistance of
  • A
    copper strip decreases germanium decreases. and that of
  • ✓
    copper strip decreases germanium increases. and that of
  • C
    Both the strip increases.
  • D
    copper strip increases germanium decreases. and that of
Answer
Correct option: B.
copper strip decreases germanium increases. and that of
copper strip decreases germanium increases. and that of
View full question & answer→
MCQ 201 Mark
Emf of a cell is 2.2 volt. When resistance $R=5 \Omega$ is connected in series, potential drop across the cell becomes 1.8 volt. Value of internal resistance of the cell is
  • ✓
    $10 / 9 \Omega$
  • B
    $7 / 12 \Omega$
  • C
    $9 / 10 \Omega$
  • D
    $12 / 7 \Omega$
Answer
Correct option: A.
$10 / 9 \Omega$
$10 / 9 \Omega$
View full question & answer→
MCQ 211 Mark
Which of the following is used for the formation of thermistor?
  • A
    copper oxide
  • B
    nickel oxide
  • C
    iron oxide
  • ✓
    all of the above
Answer
Correct option: D.
all of the above
all of the above
View full question & answer→
MCQ 221 Mark
On increasing the temperature of a conductor, its resistance increases because
  • ✓
    relaxation time decreases.
  • B
    mass of the electron increases.
  • C
    electron density decreases.
  • D
    all of the above.
Answer
Correct option: A.
relaxation time decreases.
relaxation time decreases.
View full question & answer→
MCQ 231 Mark
Thermistors are usually prepared from
  • A
    non-metals
  • B
    metals
  • C
    oxides of non-metals
  • ✓
    oxides of metals
Answer
Correct option: D.
oxides of metals
oxides of metals
View full question & answer→
MCQ 241 Mark
A typical thermistor can easily measure a change in temperature of the order of
  • ✓
    $10^{-3}{ }^{\circ} C$
  • B
    $10^{-2}{ }^{\circ} C$
  • C
    $10^2{ }^{\circ} C$
  • D
    $10^3{ }^{\circ} C$
Answer
Correct option: A.
$10^{-3}{ }^{\circ} C$
$10^{-3}{ }^{\circ} C$
View full question & answer→
MCQ 251 Mark
A given carbon resistor has the following colour code of the various strips: Orange, red, yellow and gold. The value of resistance in ohm is
  • ✓
    $32 \times 104 \pm 5 \%$
  • B
    $32 \times 104 \pm 10 \%$
  • C
    $23 \times 105 \pm 5 \%$
  • D
    $23 \times 105 \pm 10 \%$
Answer
Correct option: A.
$32 \times 104 \pm 5 \%$
$32 \times 104 \pm 5 \%$
View full question & answer→
MCQ 261 Mark
A given resistor has the following colour scheme of the various strips on it: Brown, black, green and silver. Its value in ohm is
  • A
    $1.0 \times 104 \pm 10 \%$
  • B
    $1.0 \times 105 \pm 10 \%$
  • ✓
    $1.0 \times 106+10 \%$
  • D
    $1.0 \times 107 \pm 10 \%$
Answer
Correct option: C.
$1.0 \times 106+10 \%$
$1.0 \times 106+10 \%$
View full question & answer→
MCQ 271 Mark
If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area A shall be respectively
  • ✓
    L/3 and 4 A
  • B
    L/2 and 2 A
  • C
    2L and A2
  • D
    L and A
Answer
Correct option: A.
L/3 and 4 A
L/3 and 4 A
View full question & answer→
MCQ 281 Mark
If an increase in length of copper wire is $0.5 \%$ due to stretching, the percentage increase in its resistance will be
  • A
    $0.1 \%$
  • B
    $0.2 \%$
  • ✓
    $1 \%$
  • D
    $2 \%$
Answer
Correct option: C.
$1 \%$
$1 \%$
View full question & answer→
MCQ 291 Mark
A P.D. of 20 V is applied across a conductance of 8 mho. The current in the conductor is
  • A
    2.5 A
  • B
    28 A
  • ✓
    160 A
  • D
    45 A
Answer
Correct option: C.
160 A
160 A
View full question & answer→
MCQ 301 Mark
The e.m.f. of a cell of negligible internal resistance is 2 V . It is connected to the series combination of $2 \Omega, 3 \Omega$ and $5 \Omega$ resistances. The potential difference across $3 \Omega$ resistance will be
  • ✓
    0.6 V
  • B
    10 V
  • C
    3 V
  • D
    6 V
Answer
Correct option: A.
0.6 V
0.6 V
View full question & answer→
MCQ 311 Mark
A cell of emf $E$ and internal resistance $r$ is connected across an external resistance $R(R>>r)$. The p.d. across R is A 1
  • A
    $\frac{E}{R+r}$
  • ✓
    $E \left( I -\frac{r}{R}\right)$
  • C
    $E \left(1+\frac{r}{R}\right)$
  • D
    $E(R+r)$
Answer
Correct option: B.
$E \left( I -\frac{r}{R}\right)$
$E \left( I -\frac{r}{R}\right)$
View full question & answer→
MCQ 321 Mark
Given a current carrying wire of non-uniform cross-section. Which of the following is constant throughout the length of the wire?
  • A
    Current, electric field and drift speed
  • B
    Drift speed only
  • C
    Current and drift speed
  • ✓
    Current only
Answer
Correct option: D.
Current only
Current only
View full question & answer→
MCQ 331 Mark
The resistivity of Nichrome is $10^{-6} \Omega- m$. The wire of this material has radius of 0.1 mm with resistance $100 \Omega$, then the length will be
  • ✓
    3.142 m
  • B
    0.3142 m
  • C
    3.142 cm
  • D
    31.42 m
Answer
Correct option: A.
3.142 m
3.142 m
View full question & answer→
MCQ 341 Mark
The resistance of a metal conductor increases with temperature due to
  • A
    change in current carriers.
  • B
    change in the dimensions of the conductor.
  • C
    increase in the number of collisions among the current carriers.
  • ✓
    increase in the rate of collisions between the current carriers and the vibrating atoms of the conductor.
Answer
Correct option: D.
increase in the rate of collisions between the current carriers and the vibrating atoms of the conductor.
increase in the rate of collisions between the current carriers and the vibrating atoms of the conductor.
View full question & answer→
MCQ 351 Mark
If the length of a conductor is halved, then its conductivity will be
  • A
    doubled
  • B
    halved
  • C
    quadrupled
  • ✓
    unchanged
Answer
Correct option: D.
unchanged
unchanged
View full question & answer→
MCQ 361 Mark
The unit of specific resistance is
  • A
    $\Omega m ^{-1}$
  • B
    $\Omega^{-1} m^{-1}$
  • ✓
    $\Omega m$
  • D
    $\Omega m ^{-2}$
Answer
Correct option: C.
$\Omega m$
$\Omega m$
View full question & answer→
MCQ 381 Mark
A current of 1.6 A is passed through an electric lamp for half a minute. If the charge on the electron is $1.6 \times 10^{-19} C$, the number of electrons passing through it is
  • A
    $1 \times 10^{19}$
  • B
    $1.5 \times 10^{20}$
  • C
    $3 \times 10^{19}$
  • ✓
    $3 \times 10^{20}$
Answer
Correct option: D.
$3 \times 10^{20}$
$3 \times 10^{20}$
View full question & answer→
MCQ 391 Mark
When potential difference is applied across an electrolyte, then Ohm’s law is obeyed at
  • A
    zero potential
  • B
    very low potential
  • C
    negative potential
  • ✓
    high potential.
Answer
Correct option: D.
high potential.
high potential.
View full question & answer→
MCQ 401 Mark
When a current I is set up in a wire of radius r, the drift speed is vd. If the same current is set up through a wire of radius 2r, then the drift speed will be
  • A
    $v _{ d } / 4$
  • B
    $v_d / 2$
  • C
    $2 v_d$
  • D
    $4 v _{ d }$
Answer
$v_d / 4$
View full question & answer→
MCQ 411 Mark
The drift velocity vd of electrons varies with electric field strength E as
  • ✓
    $v_d \propto E$
  • B
    $v _{ d } \propto \frac{1}{E}$
  • C
    $v_d \propto E^{1 / 2}$
  • D
    $V _{ d } \times E \frac{1}{1 / 2}$
Answer
Correct option: A.
$v_d \propto E$
$v_d \propto E$
View full question & answer→
MCQ 421 Mark
The drift velocity of free electrons in a conductor is vd, when the current is flowing in it. If both the radius and current are doubled, the drift velocity will be
  • A
    $\frac{v_d}{8}$
  • B
    $\frac{v_d}{4}$
  • ✓
    $\frac{v_d}{2}$
  • D
    $v_d$
Answer
Correct option: C.
$\frac{v_d}{2}$
$\frac{v_d}{2}$
View full question & answer→
MCQ 431 Mark
The direction of drift velocity in a conductor is
  • A
    opposite to that of applied electric field.
  • B
    opposite to the flow of positive charge.
  • C
    in the direction of the flow of electrons,
  • ✓
    all of these.
Answer
Correct option: D.
all of these.
all of these.
View full question & answer→
MCQ 441 Mark
The drift velocity of the free electrons in a conductor is independent of
  • ✓
    length of the conductor.
  • B
    cross-sectional area of conductor.
  • C
    current.
  • D
    electric charge.
Answer
Correct option: A.
length of the conductor.
length of the conductor.
View full question & answer→
Generate Paper FreeAll Electric Current Through Conductors topics