CBSE 12th Physics Delhi Set 1 - 2023
CBSE 2023 Previous Year
3 hDuration
70Total Marks
18Questions
1Sections
Instructions
General instructions for this test:
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- Total questions: 18 across 1 section(s); maximum marks: 70.
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Paper Structure
Physics
Physics
Q1.
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During the formation of a $$p$$-$$n$$ junction:
Q2.
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Assertion (A) : The resistance of an intrinsic semiconductor decreases with increase in its temperature.
Reason (R) : The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.
Q3.
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In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?
(i) Angular separation of the fringes.
(ii) Fringe-width.
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According to Huygens principle, the amplitude of secondary wavelets is
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A square shaped coil of side $$10 \mathrm{~cm}$$, having 100 turns is placed perpendicular to a magnetic field which is increasing at $$1 \mathrm{~T} / \mathrm{s}$$. The induced emf in the coil is
Q6.
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Which of the following has its permeability less than that of free space?
Q7.
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Which of the following graphs correctly represents the variation of a particle momentum with its associated de-Broglie wavelength?
Q8.
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The energy of a photon of wavelength $$\lambda%$ is
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An electric dipole of length $$2 \mathrm{~cm}$$ is placed at an angle of $$30^{\circ}$$ with an electric field $$2 \times 10^5 \mathrm{~N} / \mathrm{C}$$. If the dipole experiences a torque of $$8 \times 10^{-3} \mathrm{~Nm}$$, the magnitude of either charge of the dipole, is
Q10.
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The capacitors, each of $$4 \mu \mathrm{F}$$ are to be connected in such a way that the effective capacitance of the combination is $$6 \mu \mathrm{F}$$. This can be achieved by connecting
Q11.
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Assertion (A): The deflecting torque acting on a current carrying loop is zero when its plane is perpendicular to the direction of magnetic field.
Reason (R): The deflecting torque acting on a loop of magnetic moment $$\vec{m}$$ in a magnetic field $$\vec{B}$$ is given by the dot product of $$\vec{m}$$ and $$\vec{B}$$.
Q12.
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Two long parallel wires kept $$2 \mathrm{~m}$$ apart carry $$3 \mathrm{~A}$$ current each, in the same direction. The force per unit length on one wire due to the other is
Q13.
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The diagram shows four energy level of an electron in Bohr model of hydrogen atom. Identify the transition in which the emitted photon will have the highest energy.
Q14.
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The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is
Q15.
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The radius of the $$\mathrm{n}^{\text {th }}$$ orbit in Bohr model of hydrogen atom is proportional
Q16.
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Assertion (A) : The equivalent resistance between points A and B in the given network is 2R.
Reason (R) : All the resistors are connected in parallel
Q17.
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Which one of the following electromagnetic radiation has the least wavelength?
Q18.
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Which of the following statements about a series LCR circuit connected to an ac source is correct?