1
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

Energy of electron in the second orbit of hydrogen atom is $$\mathrm{E}$$. The energy of electron '$$\mathrm{E}_3$$' in the third orbit of helium $$(\mathrm{He})$$ atom will be

A
$$\mathrm{E}_3=\frac{4 \mathrm{E}}{9}$$
B
$$\mathrm{E}_3=\frac{16 \mathrm{E}}{3}$$
C
$$\mathrm{E}_3=\frac{16 \mathrm{E}}{9}$$
D
$$\mathrm{E}_3=\frac{4 \mathrm{E}}{3}$$
2
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A series L-C-R circuit containing a resistance of $$120 ~\Omega$$ has angular frequency $$4 \times 10^5 \mathrm{~rad} \mathrm{~s}^{-1}$$. At resonance the voltage across resistance and inductor are $$60 \mathrm{~V}$$ and $$40 \mathrm{~V}$$ respectively, then the value of inductance will be

A
$$0.2 \mathrm{~mH}$$
B
$$0.4 \mathrm{~mH}$$
C
$$0.8 \mathrm{~mH}$$
D
$$0.6 \mathrm{~mH}$$
3
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A body of mass 'M' and radius 'R', situated on the surface of the earth becomes weightless at its equator when the rotational kinetic energy of the earth reaches a critical value 'K'. The value of 'K' is given by [Assume the earth as a solid sphere, g = gravitational acceleration on the earth's surfacde]

A
$$ \frac{1}{2} \mathrm{MgR} $$
B
$$ \frac{1}{3} \mathrm{MgR} $$
C
$$ \frac{1}{4} \mathrm{MgR} $$
D
$$ \frac{1}{5} \mathrm{MgR} $$
4
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A circuit has self-inductance 'L' H and carries a current 'I' A. To prevent sparking when the circuit is switched off, a capacitor which can withstand 'V' volt is used. The least capacitance of the capacitor connected across the switch must be equal to

A
$$\frac{\mathrm{IV}}{\mathrm{L}}$$
B
$$\mathrm{L}\left(\frac{\mathrm{V}}{\mathrm{L}}\right)^2$$
C
$$\mathrm{L}\left(\frac{\mathrm{I}}{\mathrm{V}}\right)^2$$
D
$$\frac{\mathrm{LI}}{\mathrm{V}}$$
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