CBSE 12th Physics Delhi Set 1 - 2025
CBSE 2025 Previous Year
3 hDuration
70Total Marks
16Questions
1Sections
Instructions
General instructions for this test:
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- Total questions: 16 across 1 section(s); maximum marks: 70.
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Paper Structure
Physics
Physics
Q1.
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Assertion (A): We cannot form a $p-n$ junction diode by taking a slab of a $p$-type semiconductor and physically joining it to another slab of a $n$-type semiconductor.
Reason (R): In a $p$-type semiconductor $\eta_e \gg \eta_h$ while in a $n$-type semiconductor $\eta_h \gg \eta_{e^*}$
Q2.
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When a $p-n$ junction diode is forward biased
Q3.
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Assertion (A): It is difficult to move a magnet into a coil of large number of turns when the circuit of the coil is closed.
Reason (R): The direction of induced current in a coil with its circuit closed, due to motion of a magnet, is such that it opposes the cause.
Q4.
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A coil has 100 turns, each of area $0.05 \mathrm{~m}^2$ and total resistance $1.5 \Omega$. It is inserted at an instant in a magnetic field of 90 mT , with its axis parallel to the field. The charge induced in the coil at that instant is
Q5.
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The stopping potential $V_0$ measured in a photoelectric experiment for a metal surface is plotted against frequency $v$ of the incident radiation. Let $m$ be the slope of the straight line so obtained. Then the value of charge of an electron is given by ( $h$ is the Planck's constant)
Q6.
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Let $\lambda_{e r} \lambda_p$ and $\lambda_d$ be the wavelengths associated with an electron, a proton and a deuteron, all moving with the same speed. Then the correct relation between them is
Q7.
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Figure shows variation of Coulomb force $(F)$ acting between two point charges with $\frac{1}{r^2}, r$ being the separation between the two charges $\left(q_1, q_2\right)$ and $\left(q_2\right. q_3$ ). If $q_2$ is positive and least in magnitude, then the magnitudes of $q_1, q_2$ and $q_3$ are such that
Q8.
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A beaker is filled with water (refractive index $\frac{4}{3}$ ) up to a height $H$. A coin is placed at its bottom. The depth of the coin, when viewed along the near ${ }^n$ ormal direction, will be
Q9.
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A 1 cm segment of a wire lying along $x$-axis carries current of 0.5 A along $+x$ direction. A magnetic field $\vec{B}=(0.4 \mathrm{mT}) \hat{j}+(0.6 \mathrm{mT}) \hat{k}$ is switched on, in the region. The force acting on the segment is
Q10.
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**Assertion (A) :** The deflection in a galvanometer is directly proportional to the current passing through it.
**Reason (R) : **The coil of a galvanometer is suspended in a uniform radial magnetic field.
Q11.
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You are required to design an air-filled solenoid of inductance 0.016 H having a length 0.81 m and radius 0.02 m . The number of turns in the solenoid should be
Q12.
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**Assertion (A) :** The potential energy of an electon revolving in any stationary orbit in a hydrogen atom is positive.
**Reason (R) :** The total energy of a charged particle is always positive.
Q13.
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Which of the following figures correctly represents the shape of curve of binding energy per nucleon as a function of mass number?
Q14.
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Two wires $P$ and $Q$ are made of the same material. The wire $\mathbf{Q}$ has twice the diameter and half the length as that of wire $P$. If the resistance of wire $P$ is $R$, the resistance of the wire $Q$ will be
Q15.
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The given diagram exhibits the relationship between the wavelength of the electromagnetic waves and the energy of photon associated with them. The three points $\mathbf{P}, \mathbf{Q}$ and $\mathbf{R}$ marked on the diagram may correspond respectively to
Q16.
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A voltage $v=v_0 \sin \omega t$ applied to a circuit drives a current $i=i_0 \sin (\omega t+\phi)$ in the circuit. The average power consumed in the circuit over a cycle is