Are you preparing for CBSE Class 12 Physics Board Exam 2019? If yes, then check the latest CBSE 12th Physics Blueprint 2019 along with Marking Scheme & Sample Paper for the preparation of Physics Exam 2019. The CBSE (Central Board of Secondary Education) has recently released these papers. These papers are among some of the most important resources for the preparation of CBSE Class 12 Physics Board Exam 2019.
Some Content from the Sample Paper & Its Marking Scheme:
Question1. State the SI unit of the electric polarization vector P. [1]
Answer:
C/m2. [1]
For CBSE Class 12 Physics Syllabus & Blueprint, Please refer this link
CBSE Toppers' Answer Sheet 2018: Check CBSE Model Answer Sheet
Question2. Define temperature coefficient of resistivity
Answer:
Fractional change in resistivity per unit change in temperature. [1]
Question3. Name the electromagnetic waves that are widely used as a diagnostic tool in medicine. [1]
OR
Name the current which can flow even in the absence of electric charge.
Answer:
X-rays. [1]
OR
Displacement current. [1]
Question4. A ray of light is incident on a medium with angle of incidence ‘i’ and is refracted into a second medium with angle of refraction ‘r’. The graph of sin i versus sin r is as shown. Find the ratio of the velocity of light in the first medium to the velocity of light in the second medium
Answer:
From the graph tan ϴ = (sin r)/(sin i)
⇒ (sin i)/(sin r) = v1/v2
⇒ v1/v2 = cot.
Question5. Two particles have equal momenta. What is the ratio of their de-Broglie wavelengths? 1
OR
Monochromatic light of frequency 6.0x 1014 Hz is produced by a laser. What is the energy of a photon in the light beam?
Answer:
P1 = P2 [1/2]
Ratio, λ1/λ2 = 1: 1 [1/2]
OR
Each photon has an energy, E= h.ν [1/2]
= (6.63 ×10-34 J s) (6.0 × 1014 Hz) = 3.98 × 10–19 J [1/2]
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