Answer: `\frac{r}{2}`
02) The effective resistance between points A and B of the network shown in fig... ____________.
Answer: 2Ω
03) Two like charges ________ each other.
Answer: retard
04) Two unlike charges _________ each other.
Answer: attract
05) The force between two electric charges is __________.
Answer: inversly proportional to square of the distance
06) Ohm's law is stated as :
Answer: V = IR
07) Joule's law is stated as :
Answer: H = `\frac{VIJ}{t}`
08) The SI unit of charge is ___________.
Answer: coulomb
09) How many number of electrons will be there in 1.6 C charge
Answer: `10^{19}`
10) I µA = ___________ mA
Answer: `10^{-3}`
11) Which of the following materials has more number of free electrons ?
Answer: Copper
12) According to ohm's law -
Answer: The resistance increases with the increase in voltage
13) The formula for an electric current is _________.
Answer: I = `\frac{Q}{t}`
14) The amount of 2A electric current is passed for 1 minute one conducting wire. How much total electric charge will pass through this wire ?
Answer: 120C
15) Which of the following formula represent the voltage ?
Answer: `\frac{Work}{Current × time}`
16) The unit of electric potential difference is ___________.
Answer: J/C
17) The resistance of one conducting wire is 10 2. How much electric current by connecting it with a battery of 1.5 V ?
Answer: 150 mA
18) On which factor does the resistivity of conducting wire depend ?
Answer: Material of wire
19) If the five equal pieces of a resistance wire having 5s2 resistance are connect parallel, then their equivalent resistance will be -
Answer: 1Ω
20) The unit of resistivity of material is ________.
Answer: Ω m
21) Which physical quantity has a unit of kwh ?
Answer: Work
22) An electric heater consumes 1.1 kw power when 220 V Voltage applied to it. How much current will be flowing through it ?
Answer: 5 A
23) What makes the electric current flow through electric solution ?
Answer: Positive and negative ion
24) The distilled water acts as . for the electricity ?
Answer: Insulator
25) An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be..
Answer: slightly higher than its steady current
26) In the series combination of two or more than two resistances
Answer: the current through each resistance is same.
27) Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum ________.
Answer: 12.5 Q
28) In parallel combination of n cells, we obtain ___________.
Answer: more current
29) If n cells each of emf e and internal resistance r are connected in parallel, then the total emf and internal resistance will be ________.
Answer: ε =`\frac{r}{n}`
30) In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will ___________.
Answer: not change
31) When a metal conductor connected to left gap of a meter bridge is heated, the balancing point _________.
Answer: shifts towards right
32) In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should _________.
Answer: increase resistance in series with the cell whose emf is to be determined.
33) The speed at which tjie current travels in a conductor is nearly _________.
Answer: 3 × `10^4` `ms^{-1}`
34) The resistance of a human body is about ______.
Answer: 12 KΩ
35) The number of electrons that constitute 1 A of current is _________.
Answer: 6.25 × `10^{18}`
36) How many different resistances are possible with two equal resistors?
Answer: 3
37) Given three equal resistors, how many different combinations (taken all of them together) can be made?
Answer: 4
38) Specific resistance of ali metals is mostly affected by:
Answer: temperature
39) The example of a non-ohmic resistance is _________.
Answer: diode
40) If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be _______.
Answer: `\frac{L}{2}`, 2A
41) The specific resistance of a rod of copper as compared to that of thin wire of copper is ________.
Answer: same
42) A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is _________.
Answer: `\frac{2}{3}` Ω
43) The length of a conductor is halved. Its resistance will be _____.
Answer: halved
44) In the above question, the conductance __________.
Answer: doubled
45) Siemen is the unit of ___________.
Answer: conductance
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