1
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The radius of first orbit in hydrogen atom is $5.3 \times 10^{-11}$ m. The kinetic energy $E_K$, potential energy $E_P$ and total energy $E_T$ of electron in first orbit are
A
$E_K = -13.6\text{ eV}, E_P = 27.2\text{ eV}, E_T = 13.6\text{ eV}$
B
$E_K = 13.6\text{ eV}, E_P = -27.2\text{ eV}, E_T = -13.6\text{ eV}$
C
$E_K = -27.2\text{ eV}, E_P = -13.6\text{ eV}, E_T = 13.6\text{ eV}$
D
$E_K = 13.6\text{ eV}, E_P = -6.8\text{ eV}, E_T = -13.6\text{ eV}$
2
KCET 2026
MCQ (Single Correct Answer)
+1
-0
A wafer of pure germanium crystal has two parts X and Y. The end X is obtained by doping with arsenic and Y with indium. It is connected to a battery as shown in the figure. Which of the following statements is correct?
A
X is p-type, Y is n-type and the junction is forward biased
B
X is n-type, Y is p-type and the junction is forward biased
C
X is p-type, Y is n-type and the junction is reverse biased
D
X is n-type, Y is p-type and the junction is reverse biased
3
KCET 2026
MCQ (Single Correct Answer)
+1
-0
In which of the following figures, diode is reverse biased?
A
B
C
D
4
KCET 2026
MCQ (Single Correct Answer)
+1
-0
An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with
A
Arsenic and Phosphorous respectively
B
Indium and Aluminium respectively
C
Phosphorous and Indium respectively
D
Aluminium and Boron respectively