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

When photons of energy hv fall on a photosensitive surface of work function $\mathrm{E}_0$, photoelectrons of maximum energy $k$ are emitted. If the frequency of radiation is doubled the maximum kinetic energy will be equal to ( $\mathrm{h}=$ Planck's constant)

A
k
B
2 k
C
$\mathrm{k}+\mathrm{E}_0$
D
$\mathrm{k}+\mathrm{h} \nu$
2
MHT CET 2024 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The pressure inside two soap bubbles, (A) is 1.01 and that of (B) is 1.02 atmosphere respectively. The ratio of their respective radii (A to B) is (outside pressure $=1 \mathrm{~atm}$.)

A
$2: 1$
B
$4: 1$
C
$6: 1$
D
$8: 1$
3
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
4
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
$600 \mathrm{~V}, 15 \mathrm{~A}$
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