1. On which electric current does the law of Ohm's apply?
(A) on AC
(B) DC
(C) Both AC and DC
(D) None
Answer - (C)
2. is a symbol of specific resistance
(A) 𝛒
(B) 𝛍
(C) 𝛔
(D) 𝛂
Answer- (A)
3. Which of the following is a good conductor?
(A) iron
(B) Aluminum
(C) Carbon
(D) Eureka
Answer- (B)
4. Wiring is done in houses, buildings etc.
(A) in series
(B) In parallel
(C) both
(D) None of these
Answer- (B)
5. Which of the following is the formula to find power?
(A) P = V.I
(B) P = V2 / R
(C) P = I2.R
(D) All of the above
Answer- (D)
(A) nichrome
(B) Nickel
(C) Eureka
(D) copper
Answer - (C)
7. Which one of the following substances has a dielectric strength?
(A) Silver
(B) Brass
(C) Fiber
(D) Mercury
Answer - (C)
8. What is a si unit of specific conductivity ?
(A) Simen meter
(B) Simen / Meter
(C) Simen Ohm
(D) ohm / m 2
Answer- (B)
9. The resistance of a conductor is 7.5 ohms. What will be its conductivity?
(A) 0.013 Simon
(B) 0.133 Simon
(C) 1.33 Simon
(D) 133 Simon
Answer- (B)
10. Which category of fire is electric wire?
(A) A
(B) B
(C) D
(D) C
Answer - (C)
11. What is the unit of potential difference?
(A) volts
(B) Watt
(C) Ampere
(D) joule
Answer- (A)
12. How much charge is found on neutrons?
(A) + 1.6 × 10--19 colabms
(B) - 1.6 × 10--19colabms
(C) + 1.6 × 10--18colabms
(D) No charge
Answer- (A)
13. Heater's heating element is made of metal?
(A) Maganin
(B) Eureka
(C) nichrome
(D) Nikil
Answer - (C)
14. Ampere meter is arranged in what order?
(A) In parallel
(B) in series
(C) in the phase series
(D) Both A and B
Answer- (B)
15. What is the effect of electric bell ringing?
(A) Thermal effect
(B) magnetic effect
(C) Chemical effects
(D) gas ionization effect
Answer- (B)
16. MCB has a full name?
(A) miniature circuit breaker
(B) Mini circuit breaker
(C) Main Current Board
(D) Miniature circuit board
Answer- (A)
17. What is the resistance value of yellow blue green?
(A) 4600 ohm
(B) 460 kg ohm
(C) 46 kg ohm
(D) None of the above
Answer- (D)
18. How much heavier is a proton than an electron?
(A) 1845 times less
(B) 1845 times more
(C) 1846 times
(D) is equal
Answer- (A)
19. What is the melting point of silver?
(A) 1060 ℃
(B) 960 ℃
(C) 360 ℃
(D) 460 ℃
Answer- (B)
20. Doubling the length of a wire and doubling the cross section area will have resistance?
(A) will be double
(B) will increase four times
(C) will increase double
(D) will not have any effect
Answer- (D)