Kerala PSC Previous Years Question Paper & Answer

Title : Lr in Physics
Question Code : A


Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Lr in Physics' And exam conducted in the year 2015. And Question paper code was '003/2015/OL'. 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.

page: 6 out of 8
Excerpt of Question Code: 003/2015/OL

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6 of 8

CLeptons do not have colour
D:-None of these
Correct Answer:- Option-C

Question66:For a transistor operating in the saturation region,
Arle =0
Bele = hpe «Ip

Cele > hire ‏ول‎
‎Dele < bre ‏وا‎
‎Correct Answer:- Option-D
Question6 7-Output voltage vp of the ideal op-amp given below is:
Correct Answer:-Question Cancelled
Question68="The transistor circuit shown uses silicon transistor with Vag = 0.7, Ic ~ Ig anda current gain of 100. The value of Vo is,

Correct Answer:-Question Cancelled
Question69-A 4-bit D/A converter produces an output voltage of 4.5V for an input code of 1001. Its output voltage for an input code 0011 will be:
Correct Answer:- Option-C
Question70="The variation of drain current with gate-to-source voltage (Jp - Vas characteristics) of a MOSFET is shown in figure. The MOSFET is,
AvAn n-channel depletion mode device
B:-An n-channel enhancement mode device
CA p-channel depletion mode device
D:-A p-channel enhancement mode device
Correct Answer:-Question Cancelled
Question? 1-Nano tubes are structures with confinement in
‘Av2 dimensions
B:-3 dimensions
Cel dimensions

D:-zero dimension
Correct Answer:- Option-A
Question72:Unique properties of nano materials can be ascribed to
Arlarge surface to volume ratio
B:-quantum confinement effect
Cephonon confinement
Dell of the above
Correct Answer:- Option-D
Question73-CNT can be metallic if the chiral vector (n,m)
Acnm = 4
B:-(n-m)/3 is not an integer
Correct Answer:- Option-C
Question74An example of top down approach in nano technology is
B:-vapour deposition
Crsol gel technique
Correct Answer:- Option-D
Question75-Ballistic quantum conductance is related to
AvSpace technology
CHIC technology
Correct Answer:- Option-B
Question76: An important feature of Big Bang cosmology that is supported by observational astronomy is that the universe
‘Aris increasing its total mass over time
Bris expanding at an accelerating rate
Cris formed from an earlier collapsed universe
D:-contains a great deal of dark matter
Correct Answer:- Option-B
Question? 7:Pulsars are stars that give off precisely spaced bursts of radiation. Which of the following _ is responsible for this phenomenon?
AxThe strong magnetic field of a neutron star causes it to emit radiation in two narrow beams that sweep by Earth as the star spins
B:-The presence of a neutron star orbiting very close to the pulsar causes a recurring increase in the pulsar's energy output.
CsThe buildup and collapse of a neutron star's magnetic field repels and attracts ionized gases on the star's surface.
D:-The low mass of a pulsar produces alternating cycles of nuclear fusion and chemical burning that release different amounts of energy.
Correct Answer:- Option-A
Question78 In a typical H-R diagram, stars are graphed by these two characteristics
‘AvDistance and temperature
B:-Luminosity and distance
C:Temperature and luminosity
D:-Size and distance
Correct Answer:- Option-C
Question79: Which of the following appliances use solar photovoltaic technology?
ArSolar lantern

B:-Solar water heater
CrSolar air heater
Dell of the above
Correct Answer:- Option-A

‘Question80:"The value of solar constant is approximately


04/24/2015 12:06 PM

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