1
COMEDK 2024 Morning Shift
+1
-0

On increasing the temperature of a conductor, its resistance increases because

A
Electron density decreases
B
Relaxation time increases
C
Number of collisions between electrons decreases
D
Relaxation time decreases
2
COMEDK 2023 Morning Shift
+1
-0

A galvanometer having a resistance of $$8 \Omega$$ is shunted by a wire of resistance $$2 \Omega$$. If the total current is $$1 \mathrm{~A}$$, the part of it passing through the shunt will be

A
0.25 A
B
0.8 A
C
0.2 A
D
0.5 A
3
COMEDK 2023 Morning Shift
+1
-0

Two cells with the same emf $$E$$ and different internal resistances $$r_1$$ and $$r_2$$ are connected in series to an external resistance $$R$$. If the potential difference across the first cell is zero then value of $$R$$.

A
$$\sqrt{r_1 r_2}$$
B
$$r_1+r_2$$
C
$$r_1-r_2$$
D
$$\frac{r_1+r_2}{2}$$
4
COMEDK 2023 Evening Shift
+1
-0

The current sensitivity of a galvanometer having 20 divisions is $$10 \mu \mathrm{A} /$$ div. If the resistance of the galvanometer is $$100 \Omega$$ then the value of the resistance to be used to convert this galvanometer in to an voltmeter to read up to $$1 \mathrm{~V}$$ is :

A
$$4 \times 10^{-6} \Omega$$ in series with the galvanometer.
B
$$4900 \Omega$$ in parallel with the galvanometer.
C
$$4 \times 10^{-3} \Omega$$ in series with the galvanometer.
D
$$4900 \Omega$$ in series with the galvanometer.
EXAM MAP
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