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Basic MCQ's of EEE-I



1.What is the unit of electrical charge?
1.watt
2. joule
3. volt 
4. coulomb  
Answer: 4
Explanation:
unit of
Charge -> Coulomb, Energy ->Joule, Voltage -> Volts, Power -> Watts

2.The minimum resistance value for a blue, gray, red, silver resistor is
1. 612 
2. 6,120
3. 6,800 
4. 6,460 
Answer: 2
Explanation: blue-6 grey-8 red-2 so value is 6800ohms tolerance +-10% therefore minimum resistance value is 6800/100*10=680
6800-680=6120

3.If the current changes from 4A to 5A in 1s with the emf 10V. then what will be the value of inductance?
 1.10H 
2. 20H 
3. 30H 
4. 40H 
Answer: 1 
Explanation: As emf=L(i2-i1)/t by substituting i2=4A, i1=5A, emf=10V,we get L=10H

4. What happens when many resistors are connected in series?
1. Divides the voltage proportionally
2. Divides the current propotionally
3. Increase the source voltage
4. Decrease the power to zero
Answer: 1

5. Consider a circuit consists of 22 ohm resistor carrying 2 A of current then what will be the voltage across the resistance?
1. 56V
2. 15V
3. 44V 
4. 25V
Answer: 3
Explanation:
As V=IR, I = 2A, R= 22 ohm, then V= 22 x 2= 44 V

6.The two resistors are said to be connected in series when
1. Same current flows through it
2. same voltage flows through it
3. Total current divides across it
4. Voltage remains constant across them
Answer: 1

7. If the resistance of the series circuit is doubled then what will happen to the current flows through it?
1. Becomes double of its original value
2. Remains same
3. Becomes infinity
4. Becomes half of its original value
Answer: 4
Explanation:
As V=I/R,if R becomes 2R, then V = 1/2 R

8. A three terminal variable resistor is known as 
1. thermistor
2. Varistor
3. Potentiometer
4. Voltmeter
Answer: 3
Explanation: 
Potentiometer is a three-terminal resistor with a sliding contact that forms an adjustable voltage divider, current divider or other devices

9.If 10A current flows through the lamp filament then how much charge will flow through it in 1.25s?
1.10.5 C
2. 20 C
3.15.2 C
4.12.5 C
Answer: 4
Explanation:
As i = q/t , by substituting i = 10 A , t = 1.25s, then q= i x t, where q = 10 x 1.25= 12.5 C

 10.If the current in the circuit should not exceed 20 A, then what will the best value of fuse to be used?
1. 24 A
2. 10 A
3. 20 A
4. 15 A
Answer: 3
Explanation: 
The fuse in a circuit should be equal to the rate amp

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