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#1 Class 12 Physics Alternating Current 2024 Long 1M

Assertion (A): The capacitive reactance increases with an increase in the frequency ($\omega$) of the applied ac voltage. Reason (R): The value of capacitive reactance ($X_C$) is $\omega C$.

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#2 Class 12 Physics Dual Nature of Radiation and Matter 2024 Long 1M

Assertion (A): Work functions of different metals are different. Reason (R): Metals differ in their conductivity.

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#3 Class 12 Physics Semiconductor 2024 Mcq 1M

The doping of a semiconductor with donor impurity results in:

A. formation of a p-type semiconductor

B. formation of a new energy level just above the filled valence band

C. decrease in the concentration of electrons

D. formation of a new energy level just below the conduction band

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#4 Class 12 Physics Semiconductor 2024 Mcq 1M

Find the effect on the width of the depletion layer and the height of the potential barrier of a p-n junction when it is forward biased.

A. decreases, decreases

B. increases, increases

C. decreases, increases

D. increases, decreases

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#5 Class 12 Physics Atoms 2024 Mcq 1M

A positively charged particle of mass $m$, moving with velocity $v$, is bombarded on a heavy nucleus of charge $Ze$. Find the quantity to which the distance of closest approach from the nucleus is proportional.

A. $Z/(mv^2)$

B. $v^2/(Zm)$

C. $v^2$

D. $Zv^2/m$

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#6 Class 12 Physics Atoms 2024 Mcq 1M

In the Bohr model of a hydrogen atom, find the increase in the angular momentum of the electron when it is excited from the $n=1$ to the $n=3$ orbit.

A. $h/2\pi$

B. $2h/\pi$

C. $3h/2\pi$

D. $h/\pi$

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#7 Class 12 Physics Dual Nature of Radiation and Matter 2024 Mcq 1M

In the photoelectric effect, electrons are emitted from a given metal surface when the incident radiation has a certain minimum value of:

A. frequency

B. intensity

C. wavelength

D. angle of incidence

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#8 Class 12 Physics Electromagnetic Waves 2024 Mcq 1M

The frequencies of ultraviolet rays, gamma rays and microwaves are $\nu_1, \nu_2, \nu_3$ respectively. Which relation is correct?

A. $\nu_1=\nu_2=\nu_3$

B. $\nu_1>\nu_2>\nu_3$

C. $\nu_2>\nu_1>\nu_3$

D. $\nu_3>\nu_2>\nu_1$

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#9 Class 12 Physics Electromagnetic Induction 2024 Mcq 1M

The magnetic flux $\phi$ (in Wb) through a closed loop of resistance $3.0\ \Omega$ varies with time $t$ (s) as $\phi = 6t^2+3.0t+5$. Find the induced current in the loop at $t=1.0$ s.

A. 15.0 A

B. 3.0 A

C. 4.0 A

D. 5.0 A

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

A circular loop of radius $a$ carries a current $3I$. Another concentric circular loop of radius $2a$, carrying a current $I$, is placed perpendicular to the first loop. Find the dipole moment of the equivalent magnet...

A. $\pi Ia^2$

B. $5Ia$

C. $5\pi Ia^2$

D. $7\pi Ia^2$

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

Find the magnetic field $B$ within a solenoid of length $L$ having $N$ turns and carrying current $I$.

A. $\mu_0 NIL$

B. $\dfrac{\mu_0 NI}{L}$

C. $\dfrac{\mu_0 NI}{4\pi L}$

D. $\mu_0 NI$

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

The magnetic field due to a current-carrying circular coil at a point far off on its axis, at a distance $r$ from the centre of the coil, is proportional to:

A. $1/r$

B. $1/r^2$

C. $1/r^{3/2}$

D. $1/r^3$

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#13 Class 12 Physics Current Electricity 2024 Mcq 1M

The emf and internal resistance of a cell are 3 V and $0.2\ \Omega$ respectively. It is connected to an external resistor of $5.8\ \Omega$. Find the potential difference across the cell.

A. 1.2 V

B. 2.0 V

C. 2.9 V

D. 3.2 V

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

When a glass rod is rubbed with a silk cloth, it acquires a positive charge of $4.8\times10^{-17}$ C. In the process, find the number of electrons and protons transferred respectively.

A. 0, 300

B. 0, 225

C. 150, 150

D. 300, 0

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

Assertion (A): A convex lens, when immersed in a liquid, disappears (loses its refracting power). Reason (R): The refractive index of the lens material and the liquid are the same.

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#16 Class 12 Physics Moving Charges and Magnetism 2024 Long 1M

Assertion (A): A proton and an electron enter a uniform magnetic field $\vec B$ with the same momentum $p$ such that $\vec p \perp \vec B$. They will move in circular paths of the same radius. Reason (R): In a magneti...

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#17 Class 12 Physics Dual Nature of Radiation and Matter 2024 Long 1M

Assertion (A): The photoelectric effect demonstrates the particle (quantum) nature of light. Reason (R): Photoelectric current is proportional to the frequency of the incident radiation.

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#18 Class 12 Physics Semiconductor 2024 Long 1M

Assertion (A): In a semiconductor, the energy of electrons in the conduction band is less than the energy of electrons in the valence band. Reason (R): The donor energy level in a semiconductor is just above the valen...

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#19 Class 12 Physics Semiconductor 2024 Mcq 1M

Si is doped with a pentavalent element. The energy required to set the additional electron free is about:

A. 0.01 eV

B. 0.05 eV

C. 0.72 eV

D. 1.1 eV

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#20 Class 12 Physics Atoms 2024 Mcq 1M

An electron makes a transition from $n=2$ level to $n=1$ level in the Bohr model of a hydrogen atom. How does its period of revolution change?

A. increases by 87.5%

B. decreases by 87.5%

C. increases by 43.75%

D. decreases by 43.75%

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