1
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

The pitch of whistle of an engine appears to drop by $30 \%$ of the original value when it passes a stationary observer. If speed of sound in air is $350 \mathrm{~m} / \mathrm{s}$, then the speed of engine in $\mathrm{m} / \mathrm{s}$ is

A
87.5
B
105
C
150
D
175
2
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
A solenoid is connected to a battery so that a steady current flows through it, If an iron core is inserted into the solenoid, then the current in the coil
A
will not change.
B
will increase.
C
will decrease.
D
may increase or decrease depending upon the direction of the current.
3
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

A monoatomic ideal gas, initially at temperature ' $\mathrm{T}_1$ '' is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature ' $\mathrm{T}_2$ ' by releasing the piston suddenly. $L_1$ and $L_2$ are the lengths of the gas columns before and after the expansion respectively. Then $\frac{T_1}{T_2}$ is

A
$\sqrt{\frac{\mathrm{L}_1}{\mathrm{~L}_2}}$
B
$\sqrt{\frac{\mathrm{L}_2}{\mathrm{~L}_1}}$
C
$\left(\frac{L_1}{L_2}\right)^{2 / 3}$
D
$\left(\frac{L_2}{L_1}\right)^{2 / 3}$
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the diagram, the total electric flux through the closed surface ' S ' is

[Given $\mathrm{q}=$ charge

$\varepsilon_0=$ permittivity of free space]MHT CET (PCB) 2024 22th April Morning Shift Physics - Electrostatics Question 5 English

A
$\frac{q}{\varepsilon_0}$
B
$\frac{-2 q}{\varepsilon_0}$
C
$\frac{-q}{\varepsilon_0}$
D
$\frac{3 q}{\varepsilon_0}$
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