1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A metal rod of length $$10 \mathrm{~cm}$$ and a rectangular cross-section of $$1 \mathrm{~cm} \times \frac{1}{2} \mathrm{~cm}$$ is connected to a battery across opposite faces. The resistance will be

A
maximum when the battery is connected across $$1 \mathrm{~cm} \times \frac{1}{2} \mathrm{~cm}$$ faces
B
maximum when the battery is connected across $$10 \mathrm{~cm} \times \frac{1}{2} \mathrm{~cm}$$ faces
C
maximum when the battery is connected across $$10 \mathrm{~cm} \times 1 \mathrm{~cm}$$ faces
D
same irrespective of the three faces
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A car has a fresh storage battery of emf $$12 \mathrm{~V}$$ and internal resistance $$2 \times 10^{-2} \Omega$$. If the starter motor draws a current of $$80 \mathrm{~A}$$. Then, the terminal voltage when the starter is On is

A
12 V
B
8.5 V
C
8.4 V
D
9.3 V
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A potentiometer has a uniform wire of length $$5 \mathrm{~m}$$. A battery of emf $$10 \mathrm{~V}$$ and negligible internal resistance is connected between its ends. A secondary cell connected to the circuit gives balancing length at $$200 \mathrm{~cm}$$. The emf of the secondary cell is

A
4V
B
6V
C
2V
D
8V
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0

The colour code for a carbon resistor of resistance $$0.2 \mathrm{k} \Omega \pm 10 \%$$ is

A
red, grey, brown, silver
B
red, green, brown, silver
C
red, grey, silver, silver
D
red, green, silver
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