1
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In series LCR circuit, at resonance the peak value of current will be [$$\mathrm{E_0}$$ is peak emf, R is resistance, $$\omega \mathrm{L}$$ is inductive reactance and $$\omega \mathrm{C}$$ is capacitive]

A
$$\frac{E_0}{R}$$
B
$$\frac{E_0}{\sqrt{2} R}$$
C
$$\frac{E_0}{\sqrt{R^2+\left(\omega L-\frac{1}{\omega C}\right)^2}}$$
D
$$\frac{E_0}{\sqrt{2} \sqrt{R^2+\left(\omega L-\frac{1}{\omega C}\right)^2}}$$
2
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A particle is moving along the circular path with constant speed and centripetal acceleration 'a'. If the speed is doubled, the ratio of its acceleration after and before the change is

A
$$3: 1$$
B
$$1: 4$$
C
$$2: 1$$
D
$$4: 1$$
3
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The displacement of a particle performing S.H.M. is given by $$x=5 \sin (3 t+3)$$, where $$x$$ is in $$\mathrm{cm}$$ and $$t$$ is in second. The maximum acceleration of the particle will be

A
$$15 \mathrm{~cm} \mathrm{~s}^{-2}$$
B
$$30 \mathrm{~cm} \mathrm{~s}^{-2}$$
C
$$45 \mathrm{~cm} \mathrm{~s}^{-2}$$
D
$$90 \mathrm{~cm} \mathrm{~s}^{-2}$$
4
MHT CET 2021 24th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A cylindrical tube open at both ends has fundamental frequency 'n' in air. The tube is dipped vertically in water so that one-fourth of it is in water. The fundamental frequency of the air column becomes

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