1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Light of wavelength $$6000 \mathop A\limits^o$$ is incident on a thin glass plate of r.i. 1.5 such that the angle of refraction into the plate is $$60^{\circ}$$. Calculate the smallest thickness of the plate which will make dark fringe by reflected beam interference.

A
$$1.5 \times 10^{-7} \mathrm{~m}$$
B
$$2 \times 10^{-7} \mathrm{~m}$$
C
$$3.5 \times 10^{-7} \mathrm{~m}$$
D
$$4 \times 10^{-7} \mathrm{~m}$$
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

WB JEE 2024 Physics - Current Electricity Question 1 English

Consider a circuit where a cell of emf $$E_0$$ and internal resistance $$\mathrm{r}$$ is connected across the terminal $$\mathrm{A}$$ and $$\mathrm{B}$$ as shown in figure. The value of $$\mathrm{R}$$ for which the power generated in the circuit is maximum, is given by

A
$$\mathrm{R}=\mathrm{r}$$
B
$$\mathrm{R}=2 \mathrm{r}$$
C
$$\mathrm{R}=3 \mathrm{r}$$
D
$$\mathrm{R}=\frac{\mathrm{r}}{3}$$
3
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The equivalent capacitance of a combination of connected capacitors shown in the figure between the points $$\mathrm{P}$$ and $$\mathrm{N}$$ is

WB JEE 2024 Physics - Capacitor Question 1 English

A
$$3 \mathrm{C}$$
B
$$\frac{2 C}{3}$$
C
$$\frac{4 C}{5}$$
D
$$\frac{3}{2} \mathrm{C}$$
4
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

In a single-slit diffraction experiment, the slit is illuminated by light of two wavelengths $$\lambda_1$$ and $$\lambda_2$$. It is observed that the $$2^{\text {nd }}$$ order diffraction minimum for $$\lambda_1$$ coincides with the $$3^{\text {rd }}$$ diffraction minimum for $$\lambda_2$$. Then

A
$$\frac{\lambda_1}{\lambda_2}=\frac{2}{3}$$
B
$$\frac{\lambda_1}{\lambda_2}=\frac{5}{7}$$
C
$$\frac{\lambda_1}{\lambda_2}=\frac{3}{2}$$
D
$$\frac{\lambda_1}{\lambda_2}=\frac{7}{5}$$
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