Class 12 Physics Term 2 Sample Paper
CBSE Class 12 Physics Term 2 Sample Paper with Solutions: Physics is a conceptual subject and students have to understand the concepts of physics in order to solve the numerical problems of physics. The CBSE has announced the CBSE Term 2 Exam dates. The Central Board of Secondary Education is going to conduct CBSE Term 2 Exam 2022 from 26th April 2022 for Class 10th and 12th. The students must solve sample papers to assess their preparation.
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Physics Term 2 Sample Paper Class 12
To help students in their preparation we have come up with the CBSE Class 12 Term 2 Sample Paper 2022. The students must solve CBSE Class 12 Term 2 Physics Sample Paper 2022 given on this page and assess their preparation. The students who are going to give CBSE Term 2 Exam 2022 must read the whole article and bookmark this page to get all the latest updates regarding CBSE Term 2 Exam 2022.
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CBSE Term 2 Sample Paper Class 12 Physics: Exam Pattern
Here we have given the CBSE Term 2 Physics pattern. Exam pattern is a prerequisite to preparing for any exam. The students will be given a log table if necessary and the use of a calculator in exams will be prohibited. CBSE Term 2 Physics question paper consists of three sections namely Section A, Section B, and Section C. Check out the other details given below:
Section A: In Section A, three questions of two marks each will be asked.
Section B: In Section B, eight questions of three marks each will be asked.
Section C: In Section C, one case study-based question of five marks will be asked.
Check Out: CBSE Term 2 Date sheet 2022
Class 12 Physics Term 2 Sample Paper with Solutions
Q.1 In a pure semiconductor crystal of Si, if antimony is added then what type of extrinsic semiconductor
is obtained. Draw the energy band diagram of this extrinsic semiconductor so formed.
As given in the statement antimony is added to pure Si crystal, then an n-type extrinsic semiconductor would be so obtained Since antimony(Sb) is a pentavalent impurity.
Energy level diagram of n-type semiconductor
Q2. Consider two different hydrogen atoms. The electron in each atom is in an excited state. Is it possible for the electrons to have different energies but the same orbital angular momentum according to the Bohr model? Justify your answer.
No, Because according to Bohr’s model, En = -13.6/n2 and electrons having different energies belong to different levels having different values of n. So, their angular momenta will be different, as
L = mvr = nh/2π
Explain how does (i) photoelectric current
The increase in the frequency of incident radiation has no effect on photoelectric current. This is because of incident photon of increased energy cannot eject more than one electron from the metal surface.
(ii) kinetic energy of the photoelectrons emitted in a photocell vary if the frequency of incident radiation is doubled, but keeping the intensity same? Show the graphical variation in the above two cases.
The kinetic energy of the photoelectron becomes more than the double of its original energy. As the work function of the metal is fixed, so incident photon of higher frequency and hence higher energy will impart more energy to the photoelectrons.
Q3. Name the device which converts the change in intensity of illumination to a change in the electric current flowing through it. Plot I-V characteristics of this device for different intensities. State any two applications of this device.
Photodiodes are used to detect optical signals of different intensities by changing the current flowing through them.
Applications of photodiodes:
1. In detection of optical signals.
2. In demodulation of optical signals.
3. In light operated switches.
4. In speed reading of computer punched cards.
5. In electronic counters
(any two out of these or any other relevant application)
Q4. Explain with a proper diagram how an ac signal can be converted into dc ( pulsating)signal with output frequency as double than the input frequency using pn junction diode. Give its input and output waveforms.
A junction diode allows current to pass only when it is forward biased. So, if an alternating voltage is applied across a diode the current flows only in that part of the cycle when the diode is forward biased. This property is used to rectify alternating voltages and the circuit used for this purpose is called a rectifier.
Working with input and output waveforms
Q5. Define wavefront. Draw the shape of refracted wavefront when the plane incident wave undergoes refraction from optically denser medium to rarer medium. Hence prove Snell’s law of refraction.
A locus of points, which oscillate in phase is called a wavefront.
A wavefront is defined as a surface of a constant phase.
Proof n1 sin i = n2sin r (Derivation)
This is Snell’s law of refraction.
Q6. (a) Draw a ray diagram of compound microscope for the final image formed at least distance of distinct vision?
Diagram of Compound Microscope for the final image formed at D:
(a) Draw a ray diagram of the Astronomical Telescope for the final image formed at infinity.
Ray diagram of the astronomical telescope when the image is formed at infinity.
Q.7 (a) Name the e.m. waves that are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
Microwaves are suitable for the radar system used in aircraft navigation. The range of frequency of microwaves is 108 Hz to 1011 Hz
(b) If the Earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
If the Earth did not have atmosphere, then there would be absence of greenhouse effect of the atmosphere. Due to this reason, the temperature of the earth would be lower than what it is now.
(c) An e.m. wave exerts pressure on the surface on which it is incident. Justify.
An e.m. wave carries momentum with itself and given by
P = Energy of wave(U)/ Speed of the wave(c)
when it is incident upon a surface it exerts pressure on it.
(a) “If the slits in Young’s double slit experiment are identical, then intensity at any point on the screen may vary between zero and four times to the intensity due to single slit”. Justify the above statement through a relevant mathematical expression.
The total intensity at a point where the phase difference is ∅, is given by 𝐼 = 𝐼1 + 𝐼2 + 2√𝐼1𝐼2 𝐶𝑂𝑆 ∅. Here 𝐼1 and 𝐼2 are the intensities of two individual sources which are equal.
When ∅ is 0, I = 4𝐼1.
When ∅ is 90, I = 0
Thus intensity on the screen varies between 4𝐼1 and 0.
(b) Draw the intensity distribution as function of phase angle when diffraction of light takes place through coherently illuminated single slit.
Intensity distribution as function of phase angle, when diffraction of light takes place through coherently illuminated single slit
Class 12 Physics Term 2 Sample Paper Video Solution
Class 12 Physics Term 2 Sample Paper Most Important Questions
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CBSE Class 12 Physics Term 2 Sample Paper Solution: FAQs
Q. When will CBSE conduct CBSE Term 2 Examination?
The Central Board of Secondary Education has announced the CBSE Term 2 dates. The CBSE will conduct the Term 2 exam from 26th April 2022.
Q. Where can I get CBSE Class 12th Physics Sample Paper 2022?
On this page, you will get CBSE Class 12th Physics Sample Paper 2022.
Q. What are the passing Criteria?
To pass the exam the students have to secure 33% of the total marks in each subject.
Q. What is the duration to solve the CBSE Term 2 Physics paper?
The students will get 2 hrs to solve the CBSE Term 2 Physics paper.