1. The resistance of human body is around
2. The drift velocity of electrons is
3. One Commercial unit of energy equals
4. The maximum current rating for a 10KΩ, 0.5W resistor is
Explain:- P=VI or P=I²R ( as V=IR) or 0.5=I²×10×10³ or √(0.05)/10³=I i.e. I=7.071×10⁻³A= 7.07mA
5. The equivalent resistance of the circuit shown in figure is
Explain:- Rₑ= [{(3||6)+(18)}||(5)]+10= [[{(3×6)/(3+6)}+18]||5]+10= [{20||5}=10]= 4+10= 14Ω
6. If the current changes from 3A to 5A in 2s and the emf is 10V. Calculate the inductance.
7. If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x.
Explain:- We know that: emf=L(I₂-I₁)/t Substituting the values from the question, we get x=2s.
8.An electric current is the
9. Which of the following is best conductor of electricity?
Explain:- Silver is found in pure form from the Earth. Among them silver is the best conductor of electricity after second best conductor of electricity is gold.
10. What does a capacitor store?
11. An inductor blocks
12. Frequency of direct current is
13. Power factor of direct current is
14. The number of cycle per second is called
15. An instrument which detects electric current is known as
16. Power consumed in a pure inductive circuit is
17. The dielectric material used in variable capacitor is generally
18. The property of a conductor due to which it passes current is called
19. Reciprocal of the conductance is called
20. The equivalent resistance of a series parallel circuit shown in figure is
21. The curve representing ohm's law is
22. The resistance of a conductor having length 'l' area of cross section 'a' and resistivity 'ρ' is given as:
23. The resistance of wire varies inversely as
24. Which of the following quantities are same in all parts of a series circuit?
25. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
26. In gases the flow of current is due to
27. The flow of current in solids is due to
28. The minimum requirements for causing flow of current are
29. Which of the following ampere-second could be the unit?
30. The rating of the fuse wire is always expressed in
31. The S.I. unit of power is
32. One newton meter is same as
33. Which of the following materials has the least resistivity?
Explain:- Copper has the least resistivity among of them. It has the resistivity of 0.0171 ohm-meter.
34. Which of the following method can be used for absolute measurement of resistance?
35. The substance which have a large number of free electrons and offer a resistance are called
36. Which of the following does not have negative temperature co-efficient ?
37. Siemens or Mho (℧) is the unit of ____________?
Explain:- SI unit of Conductance (G) is Siemens (S) or Mho (℧) and Admittance (Y) is the inverse/reciprocal of Impedance(Z). but we also know that impedance(Z) is resistance in AC Circuits. So both of (R) and (Z) are Resistances. Therefore the reciprocal/inverse of R and Z = G and Y respectively. And G and Y are same. So the SI unit of these Quantities ( G and Y ) = Siemens (S) or (or Mho (℧).
38. What quantity of charge must be delivered by a battery with a Potential Difference of 110 V to do 660J of Work?
Explain:- Q = W/V = 660J/110V = 6C
39. The filament of an electric bulb is made of
Explain:- Tungsten is used in electric bulb because it has high melting point and it does not oxidize. Thus tungsten filament does not even melt with high current easily.
40. Which of the following materials has a negative temperature coefficient of resistance?
41. 1 Coulomb charge equals the charge on?
42. With rise in temperature the resistance of pure metals
43. With the rise in temperature the resistance of semiconductors
44. The temperature coefficient of resistance of an insulator is
45. Pure metals generally have
46. The resistance of a conductor varies inversely as
47. Which of the following material has nearly zero temperature coefficient of resistance?
Explain:- A negative coefficient for a material means that its resistance decreases with an increase in temperature. So, Manganin has nearly zero temperature coefficient of resistance, after all it is an alloy
48. Which of the following materials posses the least specific resistance?
Explain:- Silver posses the least specific resistance among of all
49. A closed switch has a resistance of
50. Bulbs in street lighting are all connected in
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