Related InterviewSolutions

• A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure.12.5). Which of the following is true?(a) R1 = R2 = R3(b) R1 > R2 > R3(c) R3 > R2 > R1(d) R2 > R3 > R1
• How will you conclude that the same potential difference (voltage) exists across three resistors connected in a parallel arrangement to a battery?
• How does use of a fuse wire protect electrical appliances?
• Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.(a) Will the bulb in the two circuits glow with the same brightness? Justify your answer.(b) Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.
• B1, B2 and B3 are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.(i) What happens to the glow of the other two bulbs when the bulb B1 gets fused?(ii) What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?(iii) How much power is dissipated in the circuit when all the three bulbs glow together
• (a) same current flowing through them when connected in parallel(b) same current flowing through them when connected in series(c) same potential difference across them when connected in series(d) different potential difference across them when connected in parallel
• (a) volt ampere(b) kilowatt hour(c) watt second(d) joule second
• In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?(a) Brightness of all the bulbs will be the same(b) Brightness of bulb A will be the maximum(c) Brightness of bulb B will be more than that of A(d) Brightness of bulb C will be less than that of B
• In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be(a) 5 J(b) 10 J(c) 20 J(d) 30 J
• The proper representation of series combination of cells (Figure 12.4) obtaining maximum potential is