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

A wire of length 0.4 m stretched at both ends vibrates 250 times per second. If the length of the wire is increased by 0.1 m and the stretching force is reduced to $1 / 4$ th of its original value, then the new frequency is

A

50 Hz

B

75 Hz

C

100 Hz

D

150 Hz

2
TS EAMCET 2022 (Online) 19th July Evening Shift
MCQ (Single Correct Answer)
+1
-0
TS EAMCET 2022 (Online) 19th July Evening Shift Physics - Ray Optics Question 11 English

A spherical glass is attached to a rigid wall as shown in the figure. An observer located at point $O$ is looking at a point $A$ on the wall. The refractive index of the glass is 1.5 and that of air is 1.0 . The distances are $O A=8 \mathrm{~cm}$, $X A=3 \mathrm{~cm}$. If the radius of curvature of spherical glass surface is $R=5 \mathrm{~cm}$, then the apparent distance of $A$ from observer $O$ is

A

6.5 cm

B

8.5 cm

C

7.0 cm

D

7.5 cm

3
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

$0.11^{\circ}$

4
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

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

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