1. The resistance in ratio 3 : 4 are connected in parallel. Heat produced in them are in ratio of:
(A) 4 : 3
(B) 3 : 4
(C) 6 : 8
(D) 9 : 16
Multiple Choice
ID- 15492
BSEB, 2020 (A)
2. The value of red colour in colour code of carbon resistance is:
(A) 0
(B) 1
(C) 2
(D) 3
Multiple Choice
ID- 15493
BSEB, 2018 (A)
3. The specific resistance of a conductor increases with:
(A) increase of temperature
(B) increase of cross-sectional area
(C) decrease in length
(D) decrease of cross-sectional area
Multiple Choice
ID- 15494
BSEB, 2020 (A)
4. The resistance of Ammeter measures:
(A) small
(B) large
(C) very small
(D) very large
Multiple Choice
ID- 15495
BSEB, 2020 (A)
5. A hot wire ammeter measures:
(A) average value of alternating current
(B) root mean square value of alternating current
(C) instantaneous value of alternating current
(D) peak value of alternating current
Multiple Choice
ID- 15496
BSEB, 2010, 2015, 2020 (A)
6. Kilowatt-hour (kWh) is the unit of:
(A) power
(B) energy
(C) torque
(D) none of these
Multiple Choice
ID- 15497
BSEB, 2011
7. The electric resistance of a healthy man is:
(A) 50,000 Ω
(B) 10,000 Ω
(C) 1,000 Ω
(D) 10 Ω
Multiple Choice
ID- 15498
BSEB, 2012
8. A current of 10 ampere flows in a wire for 10 sec. If potential difference across the wire is 15 volt. The work done will be:
(A) 1500 J
(B) 75 J
(C) 1500 J
(D) 750 J
Multiple Choice
ID- 15499
BSEB, 2013
9. A current flow in a wire of resistance 5 Ω having potential difference 7 volts for 20 minutes. The heat produced is:
(A) 140 cal
(B) 280 cal
(C) 700 cal
(D) 2800 cal
Multiple Choice
ID- 15500
BSEB, 2015; 2016 (C)
10. The algebraic sum all currents meeting at any point in an electrical circuit is:
(A) infinite
(B) positive
(C) zero
(D) negative
Multiple Choice
ID- 15501
11. Principal of Wheatstone's bridge is used in as:
(A) galvanometer
(B) potentiometer
(C) ammeter
(D) voltameter
Multiple Choice
ID- 15502
BSEB, 2017 (C)
12. Source of solar energy is:
(A) nuclear fission
(B) nuclear fusion
(C) Both 'A' and 'B'
(D) None of these
Multiple Choice
ID- 15503
BSEB, 2017 (C)
13. Wheatstone bridge compares:
(A) resistances
(B) currents
(C) potential differences
(D) All of these
Multiple Choice
ID- 15504
14. The direction of the flow of current through electric circuit is:
(A) from low potential to high potential
(B) from high potential to low potential
(C) does not depend upon potential value
(D) current cannot flow through circuit
Multiple Choice
ID- 15505
15. The electric resistance of a conductor depends upon:
(A) size of conductor
(B) temperature of conductor
(C) geometry of conductor
(D) all of above
Multiple Choice
ID- 15506
16. In parallel combination of n cells, we obtain:
(A) more voltage
(B) more current
(C) less voltage
(D) less current
Multiple Choice
ID- 15507
BSEB, 2021 (A)
17. Which of the following is the same in parallel connection of resistance?
(A) Potential difference
(B) Current
(C) Both Potential and current
(D) None of these
Multiple Choice
ID- 15508
BSEB, 2021 (A)
18. The value of yellow colour in colour code of carbon resistance is:
(A) 1
(B) 2
(C) 3
(D) 4
Multiple Choice
ID- 15509
BSEB, 2018 (C)
19. The algebraic sum of changes in Potential around any closed loop in a circuit involving resistors and cells in a closed loop is:
(A) More than zero
(B) Less than zero
(C) Zero
(D) Constant
Multiple Choice
ID- 15510
BSEB, 2018 (C)
20. The breadth and height of a metallic cuboid are equal and the length of the cuboid is twice that of its breath. The ratio of the maximum and the minimum resistances between parallel faces is:
(A) 8
(B) 4
(C) 2
(D) None of these
Multiple Choice
ID- 15511
21. The resistance of a human body is about:
(A) 12 Ω
(B) 120 Ω
(C) 12 KΩ
(D) 120 MΩ
Multiple Choice
ID- 15512
22. How many different resistances are possible with two equal resistors?
(A) 2
(B) 3
(C) 4
(D) 5
Multiple Choice
ID- 15513
23. The example of a non-ohmic resistance is:
(A) copper wire
(B) filament lamp
(C) carbon resistor
(D) diode
Multiple Choice
ID- 15514
BSEB, 2018 (C)
24. A current of 3.2 A is flowing in a conductor. The number of electrons flowing per second across a given cross section of conductor will be:
(A) 2 x $\ce{10^1^9}$
(B) 3 x $\ce{10^2^0}$
(C) 5.2 x $\ce{10^1^9}$
(D) 9 x $\ce{10^2^0}$
Multiple Choice
ID- 15515
BSEB, 2019 (A)
25. The resistance of ideal ammeter is:
(A) Zero
(B) very small
(C) very large
(D) infinite
Multiple Choice
ID- 15516
26. A wire of resistance 3Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is:
(A) $\frac{2}{3}$Ω
(B) $\frac{3}{2}$Ω
(C) $\frac{1}{2}$Ω
(D) $\frac{1}{3}$Ω
Multiple Choice
ID- 15517
27. The length of a conductor is halved. Its resistance will be:
(A) halved
(B) doubled
(C) unchanged
(D) quadrupled
Multiple Choice
ID- 15547
28. Siemen is the unit of:
(A) resistance
(B) conductance
(C) specific conductance
(D) None of these
Multiple Choice
ID- 15548
BSEB, 2021 (A)
29. The heat produced in a conductor of resistance R due to flow of current I for time t is:
(A) $\ce{I · R · t}$
(B) $\ce{I · R^2 · t}$
(C) $\ce{I^2 · R · t}$
(D) $\ce{I^2 · R^2 · t}$
Multiple Choice
ID- 15549
BSEB, 2021 (A)
30. Value of green colour code on carbon resistance is:
(A) 3
(B) 4
(C) 5
(D) 6
Multiple Choice
ID- 15550
31. Kirchhoff's first and second laws for electrical circuits are consequences of:
(A) conservation of energy
(B) conservation of electrical charge and energy respectively
(C) Conservation of electric charge
(D) neither conservation of energy nor electric charge
Multiple Choice
ID- 15551
32. A 5 A fuse wire can withstand a maximum power of 1 W in circuit. The resistance of the fuse wire is:
(A) 0.2 Ω
(B) 5 Ω
(C) 0.4 Ω
(D) 0.04 Ω
Multiple Choice
ID- 15552
33. A galvanometer acting as a volt meter will have .......... with its coil:
(A) a high resistance in parallel
(B) a high resistance in series
(C) a low resistance in parallel
(D) a low resistance in series
Multiple Choice
ID- 15553
34. Why is the Wheatstone bridge more accurate than other methods of measuring resistances:
(A) It is a null method
(B) It is based on Kirchhoff's laws
(C) It has four resistances
(D) It does not involve ohm's law
Multiple Choice
ID- 15554
35. A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be:
(A) 20 A
(B) 5 A
(C) 0.2 A
(D) None of these
Multiple Choice
ID- 15555
36. Ohm's law is valid when the temperature of conductor is:
(A) very low
(B) very high
(C) varying
(D) constant
Multiple Choice
ID- 15556
37. The emf of a car battery is about:
(A) 2.5 V
(B) 4.5 V
(C) 8.6 V
(D) 12 V
Multiple Choice
ID- 15557
38. Emf is measured in:
(A) joule
(B) joule/coulomb
(C) joule-coulombs
(D) joule/coulomb/metre
Multiple Choice
ID- 15558
39. 1 kilowatt hour is commonly known as:
(A) unit
(B) 1 faraday
(C) 1 curie
(D) None of these
Multiple Choice
ID- 15559
40. How many joules are equal time 1 kWh?
(A) 3.6 x $\ce{10^4}$
(B) 3.6 x $\ce{10^5}$
(C) 3.6 x $\ce{10^6}$
(D) None of these
Multiple Choice
ID- 15560
41. The temperature coefficient of resistance is expressed in:
(A) $\ce{°C}$
(B) $\ce{°C^–^1}$
(C) $\ce{m°C^–^1}$
(D) None of these
Multiple Choice
ID- 15561
42. Copper wire is used as connecting wire because:
(A) copper has high electrical resistivity
(B) copper has low electrical resistivity
(C) copper has low electrical conductivity
(D) copper has high value of elasticity
Multiple Choice
ID- 15562
43. The heat sensitive device whose resistivity changes very rapidly with change of temperature is called is:
(A) resistor
(B) super-conductor
(C) thermocouple
(D) thermistor
Multiple Choice
ID- 15563
44. The phenomenon of super-conductivity was discovered by:
(A) Ohm
(B) Onnes
(C) Edison
(D) None of these
Multiple Choice
ID- 15564
45. Which of the following is correct for resistivity of a meterial?
(A) ρ = $\frac{RA}{L}$
(B) ρ = $\frac{L}{RA}$
(C) ρ = $\frac{RL}{A}$
(D) ρ = $\ce{R.L.A.}$
Multiple Choice
ID- 15565
BSEB, 2021 (A)
46. Which of the following is the best conductor of electricity?
(A) Silver
(B) Copper
(C) Gold
(D) Zinc
Multiple Choice
ID- 15566
47. Which of the following has a negative temperature coefficient of resistance?
(A) Tungsten
(B) Carbon
(C) Nichrome
(D) Platinum
Multiple Choice
ID- 15567
48. An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed will be:
(A) 500 W
(B) 750 W
(C) 1000 W
(D) 1125 W
Multiple Choice
ID- 15568
BSEB, 2021 (A)
49. One ompere is equal to:
(A) $\ce{\frac{1 coulomb}{1 second}}$
(B) 1 coulomb x 1 second
(C) 1 volt x 1 ohm
(D) $\ce{\frac{1 ohm}{1 volt}}$
Multiple Choice
ID- 15569
BSEB 2019 (C)
50. Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?
(A) 25 W
(B) 100 W
(C) both bulbs have equal resistance
(D) resistance of bulbs can not be compared
Multiple Choice
ID- 15570
BSEB, 2017 (C)
51. Work function of copper is of the order of:
(A) electron volt (eV)
(B) joule
(C) watt
(D) volt
Multiple Choice
ID- 15571
52. The resistance of an aluminum wire is n. It is streched to n times its original length. Its new resistance will be:
(A) $\ce{nr}$
(B) $\ce{n^2r}$
(C) $\frac{n^2}{r}$
(D) $\frac{r}{n^2}$
Multiple Choice
ID- 15581
BSEB, 2019 (A), 2019 (C), 2021 (A)
53. Power of an electric-circuit is:
(A) $\ce{V · R}$
(B) $\ce{V^2 · R}$
(C) $\ce{\frac{V^2}{R}}$
(D) $\ce{V^2Rt}$
Multiple Choice
ID- 15583
54. Thermoelectricity eas discovered by:
(A) Joule
(B) Peitier
(C) Thomson
(D) Seebeck
Multiple Choice
ID- 15584
55. Conductivity of a conductor depends upon:
(A) length
(B) area of cross-section
(C) volume
(D) temperature
Multiple Choice
ID- 15585
BSEB 2019 (A)
56. The current flowing in a wire is 1 A. If the charge of an electron is $\ce{1.6 x 10^{–19}}$ C, then the number of elections flowing through the wire per second is:
(A) 0.625 x $\ce{10^{13}}$
(B) 6.25 x $\ce{10^{18}}$
(C) 1.6 x $\ce{10^{–19}}$
(D) 1.6 x $\ce{10^{19}}$
Multiple Choice
ID- 15586
57. A cell of emf 2 V, when short circuited gives a current of 4 A. What is the internal resistance of the cell?
(A) 2 Ω
(B) 3 Ω
(C) 0.5 Ω
(D) 0.3 Ω
Multiple Choice
ID- 15587
58. The current through a conductor is doubled, th rate of rise of temperature in the conductor will be:
(A) halved
(B) doubled
(C) four times
(D) unchanged
Multiple Choice
ID- 15588
59. Resistance of a conductor changes when;
(A) current flowing is changed
(B) resistance of the conductor is changed
(C) length of the conductor is charged
(D) temperature of the conductor is charged
Multiple Choice
ID- 15589
60. Which of the following has its temperature coefficient of resistance different from others?
(A) Germanium
(B) Carbon
(C) Silicon
(D) Tungesten
Multiple Choice
ID- 15590
61. Twh sequence of colour bands of a carbon resistance of 47 kΩ will be:
(A) yellow, violet, red
(B) yellow, violet, orange
(C) violet, yellow, orange
(D) red, red, violet
Multiple Choice
ID- 15591
62. The colour code for a resistance of 35 kΩ with 5% tolerance is:
(A) Orange, green, orange and gold
(B) Red, yellow, black and gold
(C) Orange, green, orange, and silver
(D) Orange, green, red and gold
Multiple Choice
ID- 15592
BSEB, 2021 (A)
63. Unit of electromotive force is:
(A) newton
(B) joule
(C) volt
(D) newton/ampere
Multiple Choice
ID- 15593
BSEB, 2021 (A)
64. Voltmeter measures:
(A) resistance
(B) potential difference
(C) current
(D) none of these
Multiple Choice
ID- 15594
65. Internal resistance of a cell does not depend upon:
(A) electrode separation
(B) electrode material
(C) electrolyte
(D) electrolyte area
Multiple Choice
ID- 15595
66. Kirchhoff's loop rule is consequence of:
(A) non-conservatice nature of electric field
(B) conservative nature of electric field
(C) conservative nature of magnetic field
(D) non-conservatice nature of magnetic field
Multiple Choice
ID- 15596
67. A wire has a resistance of 12 Ω. It is bent in the form of an equilateral triangle. What is the effective resistance between any two corners of the triangle?
(A) 2.67 Ω
(B) 4.63 Ω
(C) 5.23 Ω
(D) None of these
Multiple Choice
ID- 15597
68. To convert a galvanometer into an ammeter, one needs to connect a:
(A) low resistance in parallel
(B) low resistance in series
(C) high resistance in parallel
(D) high resistance in series
Multiple Choice
ID- 15598
BSEB, 2016 (C), 2019 (C)
69. EMF of a cell is measured by
(A) Voltmeter
(B) Ammeter
(C) Galvanometer
(D) Potentiometer
Multiple Choice
ID- 15599
BSEB, 2016 (C), 2019 (C)
70. The power of the electrical circuit:
(A) $\ce{V^2R}$
(B) $\ce{V^2/R}$
(C) $\ce{VR}$
(D) $\ce{V^2RI}$
Multiple Choice
ID- 15647
BSEB, 2016 (C)
71. Two cells of emf $\varepsilon_1$ and $\varepsilon_1$, internal resistance $\ce{r_1}$ and $\ce{r_2}$ connected in parallel. The equivalent emf of the combination is:
74. It the equation of an electric current is I = 0.6 sin 100$\pi$, the frequency of electric current is:
(A) 50$\pi$
(B) 50
(C) 100$\pi$
(D) 100
Multiple Choice
ID- 15651
BSEB, 2018 (A)
75. In a closed circuit of resistance 10 Ω, the linked flux varies with time according to relation ф = $\ce{6t^2 – 5t + 1, At t = 0.25}$ second, the current (in Ampere) flowing through the circuit is:
(A) 0.4
(B) 0.2
(C) 2.0
(D) 4.0
Multiple Choice
ID- 15652
76. a 5°C rise in temperature is observed in a conductor by passing a current. When the currentis doubled what is the approximate rise in temperature?