1
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

An alternating current is given by $\mathrm{I}=100 \sin (50 \pi \mathrm{t})$. How many times will the current become zero in one second?

A
50 times
B
25 times
C
40 times
D
100 times
2
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two bodies ' X ' and ' Y ' at temperatures ' $\mathrm{T}_1$ ' K and ' $T_2$ ' K respectively have the same dimensions. If their emissive powers are same, the relation between their temperatures is

A
$\frac{T_1}{T_2}=\frac{1}{3}$
B
$\frac{\mathrm{T}_1}{\mathrm{~T}_2}=\frac{81}{1}$
C
$\frac{\mathrm{T}_1}{\mathrm{~T}_2}=\frac{3^{\frac{1}{4}}}{1}$
D
$\frac{T_1}{T_2}=\frac{9^{\frac{1}{4}}}{1}$
3
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The planar concentric rings of metal wire having radii $r_1$ and $r_2$ (with $r_1>r_2$ ) are placed in air. The current $I$ is flowing through the coil of larger radius. The mutual inductance between the coils is given by ( $\mu_0=$ permeability of free space)

A
$\frac{\mu_0 \pi\left(r_1+r_2\right)^2}{2 r_2}$
B
$\frac{\mu_0 \pi\left(r_1-r_2\right)^2}{2 r_1}$
C
$\frac{\mu_0 \pi r_1^2}{2 r_2}$
D
$\frac{\mu_0 \pi r_2^2}{2 r_1}$
4
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A spherical rubber balloon carries a charge, uniformly distributed over the surface. As the balloon is blown up and increases in size, the total electric flux coming out the surface

A
becomes zero
B
decreases
C
increases
D
remains unchanged
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