1
TS EAMCET 2022 (Online) 19th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

In a double slit experiment performed in air, the angular width of a fringe is found to be $0.15^{\circ}$ on a screen placed 80 cm away. The wavelength of light is used 490 nm . The angular width of the fringe, if the entire apparatus is immersed in a medium of refractive index $\frac{5}{3}$ is

A

$0.09^{\circ}$

B

$0.7^{\circ}$

C

$0.9^{\circ}$

D

$0.11^{\circ}$

2
TS EAMCET 2022 (Online) 19th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

$6 \mu \mathrm{C}$ charge is placed at the centre of a cube. What will be the electric flux at each face of the cube?

$$ \left[\text { Take, } \frac{1}{4 \pi \varepsilon_0}=9 \times 10^9 \mathrm{~N}-\mathrm{m}^2 \mathrm{C}^2\right] $$

A

$9 \pi \times 10^2 \mathrm{~N}-\mathrm{m}^2 / \mathrm{C}$

B

$36 \pi \times 10^3 \mathrm{~N}-\mathrm{m}^2 / \mathrm{C}$

C

$3.6 \pi \times 10^3 \mathrm{~N}-\mathrm{m}^2 / \mathrm{C}$

D

$4 \pi \times 10^3 \mathrm{~N}-\mathrm{m}^2 / \mathrm{C}$

3
TS EAMCET 2022 (Online) 19th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

There are two thin wire rings, each of radius $R$, whose axes coincide. The charges of the rings are $q$ and $-q$. The magnitude of potential difference between the centres of the rings separated by a distance $\sqrt{3} R$ is

A

0

B

$\frac{q}{4 \pi \varepsilon_0 R}$

C

$\frac{q}{4 \pi \varepsilon_0 R} \frac{1}{\sqrt{3} R}$

D

$\frac{q}{2 \pi \varepsilon_0 R}$

4
TS EAMCET 2022 (Online) 19th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

Statement I The temperature coefficient of resistance for most of metals in pure form is positive.

Statement II A metal wire 2 mm in diameter carries a charge of $360 \pi \mathrm{C}$ in two hours. If the metal contains $5 \times 10^{22}$ free electrons $/ \mathrm{cm}^3$, then drift velocity of the electrons in the wire is $6.25 \times 10^{10} \mathrm{~m} / \mathrm{s}$.

Statement III Semiconductors like pure germanium does not obey Ohm's law for all range of electric field values.

Which of the following is correct?

A

Statements I, II, III are true

B

Statements I, II are true, but statement III is false

C

Statements II, III are true, but statement I is false

D

Statements I, II, III are false

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