1
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If the de-Broglie wavelength of an electron is 2 nm , then its kinetic energy is nearly (Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ and mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )
A

0.48 eV

B

0.68 eV

C

0.38 eV

D

0.25 eV

2
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The ratio of the wavelengths of the spectral lines emitted due to transitions $3 \rightarrow 2$ and $2 \rightarrow 1$ orbits in the hydrogen atom is
A

$3: 1$

B

$9: 17$

C

$27: 5$

D

$25: 9$

3
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The density (in $\mathrm{kg} \mathrm{m}^{-3}$ ) of nuclear matter is of the order of

A

$10^{21}$

B

$10^{17}$

C

$10^{12}$

D

$10^8$

4
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In common emitter amplifier of a transistor, if the ratio of the voltage gain and current amplification factor is 4 , then the ratio of the collector and base resistances is

A

$16: 1$

B

$1: 16$

C

$1: 4$

D

$4: 1$