1
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The speed of the electron in a hydrogen atom in the $n=3$ level is

(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

A
$62 \times 10^5 \mathrm{~ms}^{-1}$
B
$3.7 \times 10^5 \mathrm{~ms}^{-1}$
C
$7.3 \times 10^5 \mathrm{~ms}^{-1}$
D
$1.6 \times 10^5 \mathrm{~ms}^{-1}$
2
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

One mole of radium has an activity of $\frac{1}{3.7}$ kilo curie. Its decay constant is

(Avagadro number $=6 \times 10^{23} \mathrm{~mol}^{-1}$ )

A
$\frac{1}{6} \times 10^{-10} \mathrm{~s}^{-1}$
B
$10^{-10} \mathrm{~s}^{-1}$
C
$10^{-11} \mathrm{~s}^{-1}$
D
$10^{-8} \mathrm{~s}^{-1}$
3
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The voltage gain and current gain of a transistor amplifier in common emitter configuration are respectively 150 and 50 . If the resistance in the base circuit is $850 \Omega$, then the resistance in collector circuit is
A
$1700 \Omega$
B
$2250 \Omega$
C
$2550 \Omega$
D
$3000 \Omega$
4
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If the energy gap of a substance is 5.4 eV , then the substance is
A
insulator
B
conductor
C
p-type semiconductor
D
$n$-type semiconductor
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