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Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Non Vocational Teacher Physics (Junior & Senior)' And exam conducted in the year 2023. And Question paper code was '084/2023'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.
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Consider a one-dimensional harmonic oscillator of mass m and frequency v. It’s
2
Hamiltonian is given by H = i+ kx? . What will be number of cells in the two-dimensional
phase space within the energy range between 0 and E?
(A) # (B) Ev
0 E hv
(C) ho 0) र
Which of the following is true about Pauli’s Paramagnetism as temperature T tends to zero
Kelvin?
(A) Paramagnetic susceptibility (y))is inversely proportional to temperature
(B) Paramagnetic susceptibility (yo) is directly proportional to temperature
(0) Paramagnetic susceptibility (7) is proportional to density of Fermi gas
(D) Magnetic saturation occurs at low temperatures
Consider a JFET with shorted gate drain current Ipgg =10 mA. It has a drain current
I, =4.9 mAat a gate source voltage of Vag =(—)1.8V . The minimum drain source voltage at
which the drain current becomes constant is :
(A) 5V (8) 6%
(0 1.8 ४ ൬) 2.1४
The input resistance and feedback resistance of an inverting operational amplifier is 1kQ
and 10 kQ respectively. The open loop gain is (-114dB). If unity-gain bandwidth is 2 MHz,
then closed loop bandwidth is:
(A) 200 kHz ൫ 100kHz
(© 228kHz 0) 456 kHz
An inverting operational amplifier is used to differentiate a given signal. The values of input
capacitance C and feedback resistance R,, to get a faithful differentiation for a signal of
10kHz is :
(A) C=0.047 wF and R, =1kQ (B) C=0.47 uF and R,; =10 kQ
(C) C=0.47 uwFand R, =22 kQ (D) ¢ = 14 and R,; =10kQ
A first order low-pass Butterworth filter has a passband gain of 2. If the gain at 1kHz is 1.41,
what will be the gain at 10 kHz?
(A) 2 ®) 1
(0 0.1 (D) 0.2
084/2023 8 A