Paper Questions (Raw)
Q1. A resistor has following bands: red, brown, blue and silver. Its resistance lies between
1) (1) (189 M \Omega) to (231 M \Omega)
2) (2) (1.89 M \Omega) to (2.31 M \Omega)
3) (3) (18.9 M \Omega) to (23.1 M \Omega)
4) (4) (20 M \Omega) to (22 M \Omega)
Hint: Red
(\rightarrow 2) Brown
(\rightarrow 1) Blue
(\rightarrow 6) Silver
(\rightarrow 10 \%) (R=21 \times 10^{6} \pm 10 \%=21 M \Omega \pm 10 \%) $$ \begin{aligned} & =(21 \pm \frac{10}{100} \times 21) M \Omega=(21 \pm 2.1) M \Omega \\ & =18.9 M \Omega \text { to } 23.1 M \Omega \end{aligned} $$
Q2. Bands on a resistor have colours green, grey, brown and silver. The value of the resistance is
1) (1) (470 \pm 10 \%)
2) (2) (58 \pm 10 \%)
3) (3) (580 \pm 10 \%)
4) (4) (5800 \pm 5 \%)
Hint: Green (\rightarrow 5) Gray (\rightarrow 8) Brown (\rightarrow 1) (R=(58 \times 10^{1}) \pm 10 \%=(580 \Omega \pm 10 \%))
Q3. A resistor having bands red, green and orange is connected to a potential difference of 100 V . The current through it is
1) (1) 4 mA
2) (2) 40 mA
3) (3) (0.4 \mu A)
4) (4) (4 \mu A)
Hint: Red (\rightarrow 2) Green (\rightarrow 5) Orange (\rightarrow 3) (R=25 \times 10^{3} \Omega) (i=\frac{V}{R}) (=\frac{100}{25000}) (=4 \times 10^{-3} A=4 mA)
Q4. A given resistor has the following colour scheme of the various strips on it: Brown, Black, Green and Silver. Its value is
1) (1) (1.0 \times 10^{4} \Omega \pm 10 \%)
2) (2) (1.0 \times 10^{5} \Omega \pm 10 \%)
3) (3) (1.0 \times 10^{6} \Omega \pm 10 \%)
4) (4) (1.0 \times 10^{7} \Omega \pm 10 \%)
Hint: Numbers attached for Brown, Black, Green and Silver are (105 \pm 10 \%). (R=10 \times 10^{5} \Omega \pm 10 \%=1.0 \times 10^{6} \Omega \pm 10 \%)