1
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a 10 W bulb emits electromagnetic waves uniformly in all directions, then the intensity of light at a distance 0.5 m from the source is nearly

A

$3.18 \mathrm{Wm}^{-2}$

B

$0.31 \mathrm{Wm}^{-2}$

C

$0.62 \mathrm{Wm}^{-2}$

D

$5 \mathrm{Wm}^{-2}$

2
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of de-Broglie wavelengths associated with thermal neutrons at temperatures $127^{\circ} \mathrm{C}$ and $352^{\circ} \mathrm{C}$ is

A

$5: 3$

B

$3: 2$

C

$3: 4$

D

$5: 4$

3
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The ratio of the time periods of the revolution of the electrons in the second and third excited states of hydrogen atom is

A

$9: 16$

B

$27: 64$

C

$4: 9$

D

$8: 27$

4
AP EAPCET 2025 - 26th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the surface areas of two nucleii are in the ratio $9: 47$, then the ratio of their mass number is

A

$27: 343$

B

$9: 49$

C

$3: 7$

D

$49: 81$