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

In the circuit shown in the figure, a.c. source gives voltage $$\mathrm{V}=20 \cos (2000 \mathrm{t})$$. Impedance and r.m.s. current respectively will be

MHT CET 2021 24th September Morning Shift Physics - Alternating Current Question 4 English

A
$$10 \Omega, 0.5 \mathrm{~A}$$
B
$$5 \Omega, 2 \mathrm{~A}$$
C
$$10 \Omega, \sqrt{2} \mathrm{~A}$$
D
$$5 \Omega, 1 \mathrm{~A}$$
2
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which graph shows the correct variation of r.m.s. current 'I' with frequency 'f' of a.c. in case of (LCR) parallel resonance circuit?

MHT CET 2021 24th September Morning Shift Physics - Alternating Current Question 6 English

A
Q
B
P
C
R
D
S
3
MHT CET 2021 24th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The peak value of an alternating emf '$$\mathrm{e}$$' given by $$\mathrm{e}=\mathrm{e}_0 \cos \omega \mathrm{t}$$ is 10 volt and its frequency is $$50 \mathrm{~Hz}$$. At time $$\mathrm{t}=\frac{1}{600} \mathrm{~s}$$, the instantaneous e.m.f is $$\left(\cos \frac{\pi}{6}=\sin \frac{\pi}{3}=\frac{\sqrt{3}}{2}\right)$$

A
$$10 \mathrm{~V}$$
B
$$\frac{1}{\sqrt{3}} \mathrm{~V}$$
C
$$5 \mathrm{~V}$$
D
$$5 \sqrt{3} \mathrm{~V}$$
4
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A circuit containing resistance R$$_1$$, inductance L$$_1$$ and capacitance C$$_1$$ connected in series resonates at the same frequency 'f$$_0$$' as another circuit containing R$$_2$$, L$$_2$$ and C$$_2$$ in series. If two circuits are connected in series then the new frequency at resonance is

A
$$\mathrm{\frac{3}{4} f_r}$$
B
$$\frac{3}{2} \mathrm{f}_{\mathrm{r}}$$
C
$$\mathrm{2 f_r}$$
D
$$\mathrm{f}_{\mathrm{r}}$$
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