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Physics M.C.Q (1 Marks)

Current Electricity · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 30 questions.

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M.C.Q (1 Marks)

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30 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Two resistors $ R_1 $ and $ R_2 $ of $ 4~\Omega $ and $ 6~\Omega $ are connected in parallel across a battery. The ratio of power dissipated in them, $ P_1: P_2 $ will be :
  • A
    4 : 9
  • ✓
    3 : 2
  • C
    9 : 4
  • D
    2 : 3
Answer
Correct option: B.
3 : 2
B
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MCQ 21 Mark
A potentiometer can measure emf of a cell because :
  • A
    the sensitivity of potentiometer is large
  • ✓
    no current is drawn from the cell at balance
  • C
    no current flows in the wire of potentiometer at balance
  • D
    internal resistance of cell is neglected
Answer
Correct option: B.
no current is drawn from the cell at balance
B
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MCQ 31 Mark
Kirchoff's current law (or junction law) is a result of the conservation of which quantity ?
  • A
    Energy
  • B
    Momentum
  • ✓
    Charge
  • D
    Mass
Answer
Correct option: C.
Charge
C
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MCQ 41 Mark
$ n $ equal resistors are first connected in series and then in parallel. The ratio of maximum and minimum resistances will be :
  • A
    $ \frac{1}{n} $
  • B
    $ n $
  • C
    $ \frac{1}{n^2} $
  • ✓
    $ n^2 $
Answer
Correct option: D.
$ n^2 $
D
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MCQ 51 Mark
The resistance of any wire is $ 500~\Omega $. Its electrical conductivity will be :
  • ✓
    $ 0.002~ohm^{-1} $
  • B
    $ 0.02~ohm^{-1} $
  • C
    $ 50~ohm^{-1} $
  • D
    $ 500~ohm^{-1} $
Answer
Correct option: A.
$ 0.002~ohm^{-1} $
A
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MCQ 61 Mark
Two bulbs of $ 40~W $ and $ 60~W $ are connected to $ 220~V $ source. The ratio of their resistances will be :
  • A
    $ 4:3 $
  • B
    $ 3:4 $
  • C
    $ 2:3 $
  • ✓
    $ 3:2 $
Answer
Correct option: D.
$ 3:2 $
D
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MCQ 71 Mark
What is mainly measured by potentiometer ?
  • A
    Current
  • B
    Resistance
  • ✓
    Potential difference
  • D
    All of these
Answer
Correct option: C.
Potential difference
C
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MCQ 81 Mark
The motion of electron inside the conductor is :
  • A
    Uniform
  • B
    Accelerated
  • ✓
    Drifting
  • D
    Decelerated
Answer
Correct option: C.
Drifting
C
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MCQ 91 Mark
The relation between the drift velocity $ (V_d) $ and applied electric field $ (E) $ of a conductor is :
  • ✓
    $ V_d \propto E $
  • B
    $ V_d \propto \sqrt{E} $
  • C
    $ V_d \propto E^2 $
  • D
    $ V_d \propto \sqrt{E^3} $
Answer
Correct option: A.
$ V_d \propto E $
A
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MCQ 111 Mark
The heat produced in a conductor of resistance R due to flow of current 'I' for time 't' is :
  • A
    $ I \cdot R \cdot t $
  • B
    $ I \cdot R^2 \cdot t $
  • ✓
    $ I^2 \cdot R \cdot t $
  • D
    $ I^2 \cdot R^2 \cdot t $
Answer
Correct option: C.
$ I^2 \cdot R \cdot t $
C
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MCQ 131 Mark
One ampere is equal to :
  • ✓
    $ \frac{1~Coulomb}{1~Second} $
  • B
    $ 1~Coulomb \times 1~Second $
  • C
    $ 1~Volt \times 1~Ohm $
  • D
    $ \frac{1~Ohm}{1~Volt} $
Answer
Correct option: A.
$ \frac{1~Coulomb}{1~Second} $
A
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MCQ 141 Mark
Potential energy of a charged conductor is :
  • A
    $ CV^2 $
  • ✓
    $ \frac{1}{2} CV^2 $
  • C
    $ \frac{1}{3} CV^2 $
  • D
    $ \frac{1}{4} CV^2 $
Answer
Correct option: B.
$ \frac{1}{2} CV^2 $
B
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MCQ 151 Mark
Electric potential is equal to :
  • A
    $ \frac{q}{w} $
  • ✓
    $ \frac{w}{q} $
  • C
    $ wq $
  • D
    $ \sqrt{wq} $
Answer
Correct option: B.
$ \frac{w}{q} $
B
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MCQ 161 Mark
Voltameter measures :
  • A
    Resistance
  • ✓
    Potential differs
  • C
    Current
  • D
    None of these
Answer
Correct option: B.
Potential differs
B
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MCQ 181 Mark
Which of the following is the same in parallel connection of resistances ?
  • ✓
    Potential difference
  • B
    Current
  • C
    Both
  • D
    None of these
Answer
Correct option: A.
Potential difference
A
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MCQ 191 Mark
Which of the following values of n is not possible in relation $ Q=ne $ :
  • A
    4
  • B
    8
  • ✓
    4.2
  • D
    100
Answer
Correct option: C.
4.2
C
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MCQ 201 Mark
Which of the following is correct for resistance of a material ?
  • ✓
    $ \rho = \frac{RA}{L} $
  • B
    $ \rho = \frac{L}{RA} $
  • C
    $ \rho = \frac{RL}{A} $
  • D
    $ \rho = R \cdot L \cdot A $
Answer
Correct option: A.
$ \rho = \frac{RA}{L} $
A
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MCQ 231 Mark
The current floaring in a wire is 1A. If the charge of an electron is $ 1.6 \times 10^{-19}~C $, then the number of electrons flowing through the wire per second is :
  • A
    $ 0.625 \times 10^{23} $
  • ✓
    $ 6.25 \times 10^{18} $
  • C
    $ 1.6 \times 10^{-19} $
  • D
    $ 1.6 \times 10^{19} $
Answer
Correct option: B.
$ 6.25 \times 10^{18} $
B
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MCQ 251 Mark
When two bulbs of power $ 60~W $ and $ 40~W $ are connected in series, then the power of their combination will be :
  • A
    100 W
  • B
    2400 W
  • C
    30 W
  • ✓
    24 W
Answer
Correct option: D.
24 W
D
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MCQ 261 Mark
At constant potential difference, the resistance of any electric circuit is halved, the value of heat produced will be :
  • A
    Half
  • ✓
    Double
  • C
    Four times
  • D
    Remains constant
Answer
Correct option: B.
Double
B
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MCQ 271 Mark
The specific resistance of a conductor increases with :
  • ✓
    Increase of temperature
  • B
    Increase of cross-sectional area
  • C
    Decrease in length
  • D
    Decrease of cross-sectional area
Answer
Correct option: A.
Increase of temperature
A
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MCQ 301 Mark
The electric power :
  • A
    $ V \cdot R $
  • B
    $ V^2 \cdot R $
  • ✓
    $ V^2/R $
  • D
    $ V^2 \cdot R \cdot I $
Answer
Correct option: C.
$ V^2/R $
C
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M.C.Q (1 Marks) - Physics STD 12 Science Questions - Vidyadip