1
JEE Main 2024 (Online) 8th April Evening Shift
+4
-1

Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be _________ to __________ times of its initial length if the water is to be boiled in 15 minutes.

A
increased, $$\frac{3}{4}$$
B
increased, $$\frac{4}{3}$$
C
decreased, $$\frac{3}{4}$$
D
decreased, $$\frac{4}{3}$$
2
JEE Main 2024 (Online) 8th April Morning Shift
+4
-1

In the given circuit, the terminal potential difference of the cell is :

A
3 V
B
4 V
C
2 V
D
1.5 V
3
JEE Main 2024 (Online) 6th April Evening Shift
+4
-1

The number of electrons flowing per second in the filament of a $$110 \mathrm{~W}$$ bulb operating at $$220 \mathrm{~V}$$ is : (Given $$\mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$$)

A
$$1.25 \times 10^{19}$$
B
$$31.25 \times 10^{17}$$
C
$$6.25 \times 10^{18}$$
D
$$6.25 \times 10^{17}$$
4
JEE Main 2024 (Online) 6th April Morning Shift
+4
-1

The value of unknown resistance $$(x)$$ for which the potential difference between $$B$$ and $$D$$ will be zero in the arrangement shown, is :

A
3 $$\Omega$$
B
42 $$\Omega$$
C
6 $$\Omega$$
D
9 $$\Omega$$
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