1. S.I unit of power is
(A) Henry
(B) Coulomb
(C) watt
(D) watt-hour
Answer: (C)
2. Electric pressure is also called
(A) resistance
(B) power
(C) voltage
(D) energy
Answer: (C)
3. Substances that have a large number of free electrons and a low resistance
(A) Insulator
(B) inductor
(C) semiconductor
(D) conductor
Ans: (D)
4. Which one of the following is not a poor conductor?
(A) cast iron
(B) copper
(C) carbon
(D) tungsten
Ans: (B)
5. Which of the following is an insulating material?
(A) copper
(B) gold
(C) Silver
(D) paper
Ans: (D)
6. The properties of a conductor due to which current flows out of it are called
(A) resistance
(B) reluctance
(C) conductance
(D) inductance
7. What is the opposite of conductivity
(A) resistance
(B) reluctance
(C) conductance
(D) inductance
Answer: (A)
8. A conductor's resistance is opposite to
(A) length
(B) Area of cross-section
(C) temperature
(D) resistivity
Ans: (B)
9. Resistance to pure metals with increasing temperature
(A) increases
(B) decreases
(C) first increases and then decreases
(D) remains constant
Answer: (A)
10. Resistance of semi-conductor with increase in temperature
(A) decreases
(B) increases
(C) first increases and then decreases
(D) remains constant
Answer: (A)
11. Three resistors of 10 ohm, 15 ohm and 30 ohm are connected in parallel. What will be the total resistance of the combination
(A) 5 ohm
(B) 10 ohm
(C) 15 ohm
(D) 55 ohm
Answer: (A)
12. A device that detects an electric current is called
(A) voltmeter
(B) rheostat
(C) wattmeter
(D) galvanometer
Ans: (D)
13. A 33 ohms resistor in a circuit carries a current of 2 amp. What will be the voltage across the resistor
(A) 33 Volt
(B) 66 Volt
(C) 80 Volt
(D) 132 Volt
Ans: (B)
14. When a light bulb is connected to a 240 volt ac supply, a current of 300 mA flows out of it. What will be the resistance of the light bulb
(A) 400 Ohms
(B) 600 Ohms
(C) 800 Ohms
(D) 1000 Ohms
Answer: (C)
15. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
(A) 18 ohm
(B) 36 ohms
(C) 48 ohms
(D) 64 ohms
Ans: (B)
16. A current of 16 amperes is divided between two branches parallel to the resistance 8 ohms and 12 ohms respectively. Every branch has a current
(A) 6.4 A, 6.9 A
(B) 6.4 A, 9.6 A
(C) 4.6 A, 6.9 A
(D) 4.6 A, 9.6 A
Ans: (B)
17. In which of the following materials, the temperature coefficient of resistance is almost zero?
(A) Manganese
(B) Porcelain
(C) carbon
(D) copper
Answer: (A)
18. You have to change the resistance of 1500 ohms in the radio, you do not have a resistance of 1500 ohms, but there are many resistance of 1000 ohms, so how will you connect them to get a value of 1500 ohms
(A) two in parallel
(B) Two parallel and one range
(C) three in parallel
(D) in three categories
Ans: (B)
19. The two resistors are said to be connected in series
(A) Current of equal value passes through both
(B) Both have the same current value
(C) Total current is equal to the sum of branch currents
(D) The sum of IR drops is equal to the applied EMF.
Answer: (A)
20. Which of the following statements are series and parallel D.C. Right for the circuit?
(A) Elements have individual currents
(B) Current is additive
(C) Voltages are additive
(D) Power are additive
Answer: (D)
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