1
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The pitch of a whistle of an engine appears to drop by $30 \%$ of original value when it passes a stationary observer. If the speed of sound in air is $350 \mathrm{~ms}^{-1}$, then the speed of engine in $\mathrm{ms}^{-1}$ is

A
840
B
700
C
175
D
150
2
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A transformer having efficiency $90 \%$ is working on 200 V and 3 kw power supply. If the current in the secondary coil is 6 A , the voltage across the secondary coil and the current in the primary coil are respectively

A
$300 \mathrm{~V}, 15 \mathrm{~A}$
B
$450 \mathrm{~V}, 15 \mathrm{~A}$
C
$450 \mathrm{~V}, 13 \cdot 5 \mathrm{~A}$
D
$600 \mathrm{~V}, 15 \mathrm{~A}$
3
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A diatomic ideal gas is used in Carnot engine as a working substance. If during the adiabatic expansion part of the cycle, the volume of the gas increases from V to 32 V , the efficiency of the engine is

A
0.25
B
0.50
C
0.75
D
0.90
4
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The range of voltmeter of resistance ' $G$ ' $\Omega$ is ' $V$ ' volt. The resistance required to be connected in series with it in order to convert it into a voltmeter of range ' $n V$ ' volt, will be

A
$(\mathrm{n}-1) \mathrm{G}$
B
$\mathrm{G} / \mathrm{n}$
C
$\mathrm{nG}$
D
$\mathrm{\frac{G}{n}-1}$
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