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#1 Class 12 Physics Electric Charges and Fields 2025 Mcq 1M CBSE

A conducting wire connects two charged metallic spheres A and B of radii r$_{1}$ and r$_{2}$ respectively. The distance between the spheres is very large compared to their radii. The ratio of electric fields, (EA/EB) ...

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#2 Class 12 Physics Alternating Current 2024 Mcq 1M CBSE

The reactance of a capacitor of capacitance $C$ connected to an AC source of angular frequency $\omega$ is $X$. If the capacitance of the capacitor is doubled and the frequency of the source is tripled, the reactance ...

A. $\dfrac{X}{6}$

B. $6X$

C. $\dfrac{2}{3}X$

D. $\dfrac{3}{2}X$

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#3 Class 12 Physics Current Electricity 2024 Mcq 1M CBSE

A galvanometer of resistance $G\,\Omega$ is converted into an ammeter of range 0 to 1 A. If the current through the galvanometer is 0.1% of 1 A, the resistance of the ammeter is:

A. $\dfrac{G}{999}\,\Omega$

B. $\dfrac{G}{1000}\,\Omega$

C. $\dfrac{G}{1001}\,\Omega$

D. $\dfrac{G}{100.1}\,\Omega$

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#4 Class 12 Physics Electrostatic Potential and Capacitance 2024 Mcq 1M CBSE

Ten capacitors, each of capacitance $1\,\mu F$, are connected in parallel to a source of 100 V. The total energy stored in the system is equal to:

A. $10^{-2}$ J

B. $10^{-3}$ J

C. $0.5\times10^{-3}$ J

D. $5.0\times10^{-2}$ J

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#5 Class 12 Physics Moving Charges and Magnetism 2024 Mcq 1M CBSE

A loop carrying current $I$ clockwise is placed in the $x$–$y$ plane, in a uniform magnetic field directed along the $z$-axis. The tendency of the loop will be to:

A. move along $x$-axis

B. move along $y$-axis

C. shrink

D. expand

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#6 Class 12 Physics Electric Charges and Fields 2024 Mcq 1M CBSE

A thin plastic rod is bent into a circular ring of radius $R$. It is uniformly charged with linear charge density $\lambda$. The magnitude of the electric field at its centre is:

A. $\dfrac{\lambda}{2\varepsilon_0 R}$

B. Zero

C. $\dfrac{\lambda}{4\pi\varepsilon_0 R}$

D. $\dfrac{\lambda}{4\varepsilon_0 R}$

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#7 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 5M CBSE

(b) OR: (i) Answer the following, giving reasons: (1) In modern microscopes, compound (multi-component) lenses are used for both the objective and the eyepiece. (2) In a compound microscope, both the objective and eye...

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#8 Class 12 Physics Wave Optics 2024 Long 5M CBSE

(a)(i) What are coherent sources of light? Briefly explain how a pair of coherent sources are obtained in Young's double-slit experiment. Mention the conditions for constructive and destructive interference in this ex...

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#9 Class 12 Physics Alternating Current 2024 Long 5M CBSE

(b) OR: (i) Briefly explain the working of an ac generator. Obtain the expression for the instantaneous value of the emf induced in the generator. (ii) Calculate the angular frequency at resonance of a series LCR circ...

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#10 Class 12 Physics Electromagnetic Induction 2024 Long 5M CBSE

(a)(i) Define the term 'self-inductance' of a coil. Obtain an expression for the self-inductance of a solenoid of cross-sectional area A, length L, having n turns per unit length. (ii) The current flowing in a coil of...

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#11 Class 12 Physics Electrostatic Potential and Capacitance 2024 Long 5M CBSE

(b) OR: (i) Obtain an expression for the electric potential at a distance r from a point charge Q. (ii) Two point charges of $10\ \mu C$ and $-5\ \mu C$ are placed at $(-3\ cm, 0)$ and $(6\ cm, 0)$ in an external elec...

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#12 Class 12 Physics Electrostatic Potential and Capacitance 2024 Long 5M CBSE

(a)(i) A capacitor of capacitance C is charged to a potential difference V by a battery. The battery is disconnected and the separation between the plates is halved. How will the following quantities be affected: (1) ...

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#13 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q30 contd.] (iv)(a) A molecule of dipole moment $3.0\times10^{-30}$ C·m is placed in a uniform electric field of $2\times10^4\ NC^{-1}$. Find the maximum torque experienced by this molecule. OR (b) An ele...

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#14 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q30 contd.] (iii) Two identical short electric dipoles, each of dipole moment $\vec p$, are arranged perpendicular to each other such that their negative charges coincide. Find the magnitude of the net di...

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#15 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study, Q30 contd.] (ii) An electric dipole is made of charges +q and −q separated by distance 2a. The force acting on a point charge placed at distance x ($\gg a$) on the axis of the dipole is F. If the distance...

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#16 Class 12 Physics Electric Charges and Fields 2024 Long 1M CBSE

[Case Study] An electric dipole is a pair of equal and opposite point charges +q and −q, separated by a distance 2a. A dipole is characterised by its dipole moment (a vector, direction from −q to +q). When a dipole is...

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#17 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 1M CBSE

[Case Study, Q29 contd.] (iv) Light of wavelength $\lambda$, travelling with speed c in air, enters a medium of refractive index $\mu$. Find the frequency of light in the medium.

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#18 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 1M CBSE

[Case Study, Q29 contd.] (iii) In an optical fibre, the refractive indices of the core and cladding are $\mu_1$ and $\mu_2$ respectively. Compare them.

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#19 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 1M CBSE

[Case Study, Q29 contd.] (ii)(a) A ray of light travelling from air into a medium is incident on the interface at 45°. If the ray deviates by 15° from its initial path, find the refractive index of the medium. OR (b) ...

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#20 Class 12 Physics Ray Optics and Optical Instruments 2024 Long 1M CBSE

[Case Study] In a homogeneous medium, light travels in a straight line. When light travels from one medium to another, it deviates from its path — this is refraction, governed by the relative refractive index (related...

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