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

A coil of self inductance L is connected in series with a bulb B and an a.c. source. Brightness of the bulb decreases when

A
frequency of a.c. source is decreased.
B
number of turns in the coil is reduced.
C
a capacitance of reactance $\left(\mathrm{X}_{\mathrm{L}}-\mathrm{X}_{\mathrm{C}}\right)$ is included in the same circuit.
D
an iron rod is inserted in the coil.
2
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A transverse wave travelling along a stretched string has a speed of $30 \mathrm{~m} / \mathrm{s}$ and a frequency of 250 Hz . The phase difference between two points on the string 10 cm apart at the same instant is

A
$0^c$
B
$\left(\frac{\pi}{2}\right)^c$
C
$\left(\frac{5 \pi}{3}\right)^c$
D
$\left(\frac{8 \pi}{3}\right)^c$
3
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A lead bullet moving with velocity ' $v$ ' strikes a wall and stops. If $50 \%$ of its energy is converted into heat, then the increase in temperature is ( $s=$ specific heat of lead)

A
$\frac{\mathrm{v}^2 \mathrm{~s}}{2 \mathrm{~J}}$
B
$\frac{v^2}{4 \mathrm{Js}}$
C
$\frac{\mathrm{v}^2 \mathrm{~s}}{\mathrm{~J}}$
D
$\frac{2 v^2}{\mathrm{Js}}$
4
MHT CET 2024 4th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

A pendulum is oscillating with frequency ' $n$ ' on the surface of earth. If it is taken to a depth $\frac{R}{4}$ below the surface of earth, new frequency of oscillation of depth $\frac{\mathrm{R}}{4}$ is ( $\mathrm{R}=$ radius of earth)

A
$\frac{2}{\sqrt{3} n}$
B
$\frac{\sqrt{3} n}{2}$
C
  $\frac{2 \mathrm{n}}{\sqrt{3}}$
D
$\frac{\mathrm{n}}{4}$
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