electricity basics mcq questions answers part1

Q1. Two 30 Ω resistors connected in parallel and connected across a 30-V source, what is the total current flowing in the circuit?
(A) 1A
(B) 2A
(C) 3A
(D) 4A

Q2. Two lamps 100 W and 60 W are connected in series across 230 V (alternating). Which of the following statement is correct?
(A) 60 W lamp will glow brighter
(B) 100 W lamp will glow brighter
(C) Both lamps will equally bright
(D) None of these

Q3. Two resistors are said to be connected in series when
(A) same current passes through them
(B) different current passes through them
(C) Both are correct
(D) None of these

Q4. Voltage dependent resistors are used
(A) for inductive circuits
(B) as current stabilizers
(C) to supress surges
(D) as heating elements

Q5. What happens to current flow in a capacitive circuit when the DC voltage across the capacitor is equal to the source voltage?
(A) Current flow is optimize
(B) No current flows.
(C) Current flow reaches maximum
(D) None of these

Q6. What happens to the current-carrying ability of a wire as the temperature rises
(A) no change.
(B) The wire can carry more current.
(C) The wire can carry less current.
(D) The wire burn out

Q7. What is the applied voltage on a circuit in which 1A is flowing and 10 W is generated?
(A) 5 V
(B) 10 V
(C) 20 V
(D) 50 V

Q8. What type of measurement will the multimeter indicate?
(A) peak-to-peak
(B) peak
(C) average
(D) rms

Q9. Which of the following circuit configurations has the same voltage drop across each of its components?
(A) parallel
(B) series-parallel
(C) series
(D) All of these

Q10. Which of the following factor determines total power in a series circuit?
(A) Product of source voltage and the current
(B) total voltage applied to the circuit
(C) current flowing through a switch
(D) None of these

Q11. Which of the following properties has the unit of Henry?
(A) reactance
(B) capacitance
(C) resistance
(D) inductance

Q12. Which of the following quantities remain the same in all parts of a parallel circuit?
(A) Power
(B) Current
(C) Voltage
(D) None of these

Q13. Which of the following statement is true both for a series and a parallel D.C. circuit?
(A) Currents are additive
(B) Power are additive
(C) Voltages are additive
(D) None of these

Q14. Which of the following theorem is related with the selection of load for maximum power transfer?
(A) Thevenins theorem
(B) Nortans theorom
(C) Millmans theorem
(D) Maximum power transfer theorem

Q15. Which of the following wires has the greatest cross-sectional area?
(A) 2 AWG
(B) 24 AWG
(C) 32 AWG
(D) 40 AWG

Q16. With rise in temperature the resistance of pure metals:
(A) decreases
(B) remains constant
(C) increases
(D) first decreases and then increases

Q17. if two voltages are connected in parallel then the value is
(A) increases
(B) decreases
(C) equal
(D) zero

Q18. ohms law is true
(A) for metallic conductor at low temperature
(B) for metallic conductor at high temperature
(C) for electrolytes when current passes through them
(D) for diode when current flow

Q19. serial adder is a
(A) combinational circuit
(B) sequential circuit
(C) none
(D) all

Q20. what is ac in electrical current term ?
(A) air compresser
(B) alternative capactor
(C) alternative current
(D) air conditioner