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Science M.C.Q

electricity · Gujarat Board (GSEB) STD 10 (GSEB - English Medium). 14 questions.

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14 questions · timed · auto-graded

MCQ 11 Mark
Select false statement from the following.
  • A
    Magnetic field lines form closed loops.
  • B
    Magnetic field is stronger at the region in magnetic field where field lines are crowded.
  • ✓
    Magnetic field lines can cross each other after intersecting.
  • D
    Outside bar magnet, magnetic field is from $N$ to $S$.
Answer
Correct option: C.
Magnetic field lines can cross each other after intersecting.
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MCQ 21 Mark
For a current carrying straight wire, while using right hand thumb rule, what is indicated by thumb?
  • ✓
    current
  • B
    motion of conductor
  • C
    magnetic field
  • D
    magnetic force
Answer
Correct option: A.
current
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MCQ 31 Mark
Choose the correct option. The magnetic field inside a long, straight current carrying solenoid,
  • A
    is zero.
  • B
    decreases as we move towards its end.
  • C
    increases as we move towards its end.
  • ✓
    is the same at all points.
Answer
Correct option: D.
is the same at all points.
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MCQ 41 Mark
Choose the correct option. The magnetic field inside a long, straight current carrying solenoid,
  • A
    is zero.
  • B
    decreases as we move towards its end.
  • C
    increases as we move towards its end.
  • ✓
    is the same at all points.
Answer
Correct option: D.
is the same at all points.
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MCQ 51 Mark
In the house wiring, which coloured insulation does neutral wire have ?
  • A
    Red
  • ✓
    Black
  • C
    Green
  • D
    White
Answer
Correct option: B.
Black
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MCQ 61 Mark
Assertion $(A) :$ Alloys are commonly used in electrical heating devices like electric iron and heater.
Reason $(R):$ Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.
  • ✓
    Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of the assertion $(A).$
  • B
    Both $(A) $and $(R)$ are true, but $(R)$ is not the correct explanation of the assertion $(A).$
  • C
    $(A)$ is true, but $(R)$ is false.
  • D
    $(A)$ is false, but $(R)$ is true.
Answer
Correct option: A.
Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of the assertion $(A).$
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MCQ 71 Mark
A cylindrical conductor of length ‘l’ and uniform area of cross section $‘A’ $has resistance $‘R’$. The area of cross section of another conductor of same material and same resistance but of length ‘$2l$’ is
  • A
    $\frac{A}{2}$
  • B
    $\frac{3 A}{2}$
  • ✓
    $2A$
  • D
    $3A$
Answer
Correct option: C.
$2A$
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MCQ 81 Mark
Assertion $(A) :$ The metals and alloys are good conductors of electricity.
Reason $(R) :$ Bronze is an alloy of copper and tin and it is not a good conductor of electricity.
  • A
    Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of the assertion $(A).$
  • B
    Both $(A)$ and $(R)$ are true, but $(R)$ is not the correct explanation of the assertion $(A).$
  • ✓
    $(A)$ is true, but $(R)$ is false.
  • D
    $(A)$ is false, but $(R)$ is true.
Answer
Correct option: C.
$(A)$ is true, but $(R)$ is false.
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MCQ 91 Mark
A student plots $V-I$ graphs for three samples of nichrome wire with resistances $R_1$, $R_2$ and $R_3$. Choose from the following the statements that holds true for this graph
Image
  • A
    $R_1 = R_2 =R_4$
  • B
    $R_1> R_2 > R_3$
  • C
    $R_3 > R_2 > R_1$
  • ✓
    $R_2 > R_1 > R_3$
Answer
Correct option: D.
$R_2 > R_1 > R_3$
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MCQ 101 Mark
A piece of wire of resistance $R$ is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is $R′$, then the ratio $R/R′$ is $..........$
  • A
    $\frac{1}{25}$
  • B
    $\frac{1}{5}$
  • C
    $5$
  • ✓
    $25$
Answer
Correct option: D.
$25$
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MCQ 111 Mark
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be –
  • A
    $(1 : 2)$
  • B
    $(2 : 1)$
  • ✓
    $(1 : 4)$
  • D
    $(4 : 1)$
Answer
Correct option: C.
$(1 : 4)$
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MCQ 121 Mark
An electric bulb is rated $220 \ V$ and loo $W$. When it is operated on $110 \ V$, the power consumed will be –
  • A
    $100 \ W$
  • B
    $75 \ W$
  • C
    $50 \ W$
  • ✓
    $25 \ W$
Answer
Correct option: D.
$25 \ W$
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MCQ 131 Mark
Which of the following terms does not represent electrical power in a circuit?
  • A
    $I^2R$
  • ✓
    $IR^2$
  • C
    $VI$
  • D
    $V^2/R$
Answer
Correct option: B.
$IR^2$
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MCQ 141 Mark
Image
For above network, equivalent resistance between points $A$ and $B$ is $.........$
  • ✓
    $45 \Omega$
  • B
    $15\Omega$
  • C
    $5 \Omega$
  • D
    $22.5\Omega$
Answer
Correct option: A.
$45 \Omega$
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