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1. Biomolecules and Cell Biology
1. What is the unit of electrical power?
Watt
Ampere
Volt
Ohm
2. Ohm’s law states that voltage is directly proportional to:
Current
Resistance
Power
Energy
3. Which of the following is a conducting material?
Rubber
Copper
Glass
Plastic
4. In a parallel circuit, the voltage across each component is:
Different
Same
Zero
Half the source voltage
5. Which law states that the sum of currents entering a junction equals the sum of currents leaving?
Ohm’s Law
Kirchhoff’s Current Law
Faraday’s Law
Ampere’s Law
6. What is the formula for electrical power?
P=IV
P=I2R
P=R2I
P=RV
7. The total resistance in a series circuit is:
The sum of the individual resistances
The product of the resistances
The average of the resistances
The reciprocal of the sum of reciprocals
8. What type of circuit consists of components arranged such that the current can only follow one path?
Series Circuit
Parallel Circuit
Closed Circuit
Open Circuit
9. The resistance of a conductor depends on all of the following except:
Length of the conductor
Voltage applied to the conductor
Material of the conductor
Cross-sectional area
10. What is the SI unit of electrical charge?
Ampere
Coulomb
Volt
Ohm
11. Which of the following materials is used as an insulator?
Copper
Aluminum
Wood
Glass
12. In a delta connection, the phase voltage is:
Equal to line voltage
Three times the line voltage
Zero
Half of the line voltage
13. In a series circuit, the current is:
Same in all components
Zero in all components
Varies in different components
Zero at the source
14. What is the relationship between voltage, current, and resistance?
V=I×R
V=I+R
V=I−R
V=I/R
15. A material that has high electrical conductivity is:
Insulator
Semiconductor
Conductor
Dielectric
16. The total resistance in a parallel circuit is:
The sum of individual resistances
Always less than the smallest resistance
The product of individual resistances
Equal to the largest resistance
17. What is the formula for the total resistance in a parallel circuit?
Rtotal1=R11+R21+…
Rtotal=R1+R2+…
Rtotal=R11
Rtotal=R1×R2
18. Which of the following is a non-linear element in a circuit?
Resistor
Capacitor
Diode
Inductor
19. In a star connection, the line voltage is:
Equal to phase voltage
Three times the phase voltage
Half the phase voltage
Zero
20. A bilateral circuit is one where:
The properties are the same in both directions
The properties change depending on current direction
Only works in one direction
Voltage is always constant
21. The power dissipated in a resistor is given by:
P=RV2
P=I2×R
P=V×I
All of the above
22. The process of converting from delta to star connection involves:
Dividing each resistance by 3
Multiplying each resistance by 3
Subtracting 1 from each resistance
Dividing each resistance by 2
23. What is the unit of electrical energy?
Watt
Joule
Ampere
Ohm
24. Which of the following statements is correct about Kirchhoff's Voltage Law (KVL)?
The sum of the voltages in a closed loop equals zero
The sum of the currents in a loop equals zero
Voltage is constant in a series circuit
Voltage is zero in a closed loop
25. What does the symbol ∼ in an AC circuit represent?
DC voltage
Sinusoidal AC voltage
Constant voltage
Variable current
26. In a circuit, which of the following components is typically used to limit the current flow?
Resistor
Capacitor
Inductor
Diode
27. The energy stored in a capacitor is given by:
E=21CV2
E=CV
E=I2R
E=21LI2
28. Which of the following is a passive component?
Resistor
Diode
Transistor
Switch
29. The electrical impedance of a circuit depends on all except:
Resistance
Inductance
Capacitance
Voltage
30. What is the formula for calculating the total current in a parallel circuit?
Itotal=I1+I2+I3…
Itotal=I1−I2
Itotal=I1×I2
Itotal=I1/I2
31. In a circuit, the unit of inductance is:
Henry
Watt
Volt
Ampere
32. The characteristic of a unilateral circuit is that:
It allows current to flow in only one direction
It allows current to flow in both directions
It has no resistive components
It operates in alternating current only
33. In a DC circuit, the power is considered active if it:
Is used to do work
Is lost as heat
Is stored in a capacitor
Is stored in an inductor
34. The reactance in an AC circuit is caused by:
Only inductive elements
Only capacitive elements
Inductive and capacitive elements
Resistors
35. Which of the following is a unilateral circuit?
A circuit with only diodes
A circuit with only resistors
A circuit with only inductors
A circuit with only capacitors
36. The unit of voltage is:
Ampere
Volt
Ohm
Watt
37. In a power system, transformers are used to:
Increase voltage
Decrease voltage
Convert current to voltage
Convert voltage to current
38. The total power in a parallel circuit is:
The sum of the powers in each branch
The product of all powers
The average of the powers
Equal to the highest power
39. Which of the following components does not obey Ohm’s law?
Capacitor
Resistor
Inductor
Diode
40. What is the primary function of a fuse in a circuit?
To limit current
To protect the circuit from overload
To increase voltage
To store electrical energy
41. When voltage and current are in phase, the power factor is:
Zero
One
Less than one
Greater than one
42. In a star connection, what happens to the line current?
It is equal to the phase current
It is higher than the phase current
It is lower than the phase current
It does not exist
43. What is the effect of increasing the length of a conductor on its resistance?
It decreases the resistance
It increases the resistance
It has no effect
It makes the resistance variable
44. What happens to the power in a resistor if the voltage is doubled?
Power is halved
Power is doubled
Power remains the same
Power quadruples
45. What is the unit of electrical power?
Watt
Ampere
Volt
Ohm
46. Ohm’s law states that voltage is directly proportional to:
Current
Resistance
Power
Energy
47. Which of the following is a conducting material?
Rubber
Copper
Glass
Plastic
48. In a parallel circuit, the voltage across each component is:
Different
Same
Zero
Half the source voltage
49. Which law states that the sum of currents entering a junction equals the sum of currents leaving?
Ohm’s Law
Kirchhoff’s Current Law
Faraday’s Law
Ampere’s Law
50. What is the formula for electrical power?
P=IV
P=I2R
P=R2I
P=RV
51. The total resistance in a series circuit is:
The sum of the individual resistances
The product of the resistances
The average of the resistances
The reciprocal of the sum of reciprocals
52. What type of circuit consists of components arranged such that the current can only follow one path?
Series Circuit
Parallel Circuit
Closed Circuit
Open Circuit
53. The resistance of a conductor depends on all of the following except:
Length of the conductor
Voltage applied to the conductor
Material of the conductor
Cross-sectional area
54. What is the SI unit of electrical charge?
Ampere
Coulomb
Volt
Ohm
55. Which of the following materials is used as an insulator?
Copper
Aluminum
Wood
Glass
56. In a delta connection, the phase voltage is:
Equal to line voltage
Three times the line voltage
Zero
Half of the line voltage
57. In a series circuit, the current is:
Same in all components
Zero in all components
Varies in different components
Zero at the source
58. What is the relationship between voltage, current, and resistance?
V=I×R
V=I+R
V=I−R
V=I/R
59. A material that has high electrical conductivity is:
Insulator
Semiconductor
Conductor
Dielectric
60. The total resistance in a parallel circuit is:
The sum of individual resistances
Always less than the smallest resistance
The product of individual resistances
Equal to the largest resistance
61. What is the formula for the total resistance in a parallel circuit?
Rtotal1=R11+R21+…
Rtotal=R1+R2+…
Rtotal=R11
Rtotal=R1×R2
62. Which of the following is a non-linear element in a circuit?
Resistor
Capacitor
Diode
Inductor
63. In a star connection, the line voltage is:
Equal to phase voltage
Three times the phase voltage
Half the phase voltage
Zero
64. A bilateral circuit is one where:
The properties are the same in both directions
The properties change depending on current direction
Only works in one direction
Voltage is always constant
65. The power dissipated in a resistor is given by:
P=RV2
P=I2×R
P=V×I
All of the above
66. The process of converting from delta to star connection involves:
Dividing each resistance by 3
Multiplying each resistance by 3
Subtracting 1 from each resistance
Dividing each resistance by 2
67. What is the unit of electrical energy?
Watt
Joule
Ampere
Ohm
68. Which of the following statements is correct about Kirchhoff's Voltage Law (KVL)?
The sum of the voltages in a closed loop equals zero
The sum of the currents in a loop equals zero
Voltage is constant in a series circuit
Voltage is zero in a closed loop
69. What does the symbol ∼ in an AC circuit represent?
DC voltage
Sinusoidal AC voltage
Constant voltage
Variable current
70. In a circuit, which of the following components is typically used to limit the current flow?
Resistor
Capacitor
Inductor
Diode
71. The energy stored in a capacitor is given by:
E=21CV2
E=CV
E=I2R
E=21LI2
72. Which of the following is a passive component?
Resistor
Diode
Transistor
Switch
73. The electrical impedance of a circuit depends on all except:
Resistance
Inductance
Capacitance
Voltage
74. What is the formula for calculating the total current in a parallel circuit?
Itotal=I1+I2+I3…
Itotal=I1−I2
Itotal=I1×I2
Itotal=I1/I2
75. In a circuit, the unit of inductance is:
Henry
Watt
Volt
Ampere
76. The characteristic of a unilateral circuit is that:
It allows current to flow in only one direction
It allows current to flow in both directions
It has no resistive components
It operates in alternating current only
77. The power in a DC circuit is considered active if it:
Is used to do work
Is lost as heat
Is stored in a capacitor
Is stored in an inductor
78. The reactance in an AC circuit is caused by:
Only inductive elements
Only capacitive elements
Inductive and capacitive elements
Resistors
79. Which of the following is a unilateral circuit?
A circuit with only diodes
A circuit with only resistors
A circuit with only inductors
A circuit with only capacitors
80. The unit of voltage is:
Ampere
Volt
Ohm
Watt
81. In a power system, transformers are used to:
Increase voltage
Decrease voltage
Convert current to voltage
Convert voltage to current
82. The total power in a parallel circuit is:
The sum of the powers in each branch
The product of all powers
The average of the powers
Equal to the highest power
83. Which of the following components does not obey Ohm’s law?
Capacitor
Resistor
Inductor
Diode
84. What is the primary function of a fuse in a circuit?
To limit current
To protect the circuit from overload
To increase voltage
To store electrical energy
85. When voltage and current are in phase, the power factor is:
Zero
One
Less than one
Greater than one
86. In a star connection, what happens to the line current?
It is equal to the phase current
It is higher than the phase current
It is lower than the phase current
It does not exist
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