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#1 Class 12 Physics Alternating Current 2024 Mcq 1M

A resistor and an ideal inductor are connected in series to a $100\sqrt2$ V, 50 Hz ac source. When a voltmeter is connected across the resistor or the inductor, it shows the same reading. Find the reading of the voltm...

A. $100\sqrt2$ V

B. 100 V

C. $50\sqrt2$ V

D. 50 V

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#2 Class 12 Physics Alternating Current 2024 Mcq 1M

Which of the following quantity/quantities remains the same in the primary and secondary coils of an ideal transformer — Current, Voltage, Power, Magnetic flux?

A. Current only

B. Voltage only

C. Power only

D. Magnetic flux and Power both

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#3 Class 12 Physics Electromagnetic Induction 2024 Mcq 1M

A circular coil of radius 10 cm is placed in a magnetic field $\vec B = (1.0\hat i + 0.5\hat j)\ mT$ such that the outward unit vector normal to the surface of the coil is $(0.6\hat i + 0.8\hat j)$. Find the magnetic ...

A. $0.314\ \mu Wb$

B. $3.14\ \mu Wb$

C. $31.4\ \mu Wb$

D. $1.256\ \mu Wb$

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

A wire of length 4.4 m is bent round in the shape of a circular loop and carries a current of 1.0 A. Find the magnetic moment of the loop.

A. $0.7\ Am^2$

B. $1.54\ Am^2$

C. $2.10\ Am^2$

D. $3.5\ Am^2$

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#5 Class 12 Physics Current Electricity 2024 Mcq 1M

Electrons drift with speed $v_d$ in a conductor with potential difference $V$ across its ends. If $V$ is reduced to $V/2$, what will the drift speed become?

A. $v_d/2$

B. $v_d$

C. $2v_d$

D. $4v_d$

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

Two charged particles P and Q, having the same charge but different masses $m_P$ and $m_Q$, start from rest and travel equal distances in a uniform electric field $\vec E$ in times $t_P$ and $t_Q$ respectively. Neglec...

A. $m_P/m_Q$

B. $m_Q/m_P$

C. $\sqrt{m_P/m_Q}$

D. $\sqrt{m_Q/m_P}$

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

Assertion (A): Plane and convex mirrors cannot produce real images under any circumstance. Reason (R): A virtual image cannot serve as an object to produce a real image.

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

Assertion (A): Two long parallel wires, freely suspended and connected in series to a battery, move apart. Reason (R): Two wires carrying current in opposite directions repel each other.

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#9 Class 12 Physics Electromagnetic Induction 2024 Long 1M

Assertion (A): The mutual inductance between two coils is maximum when the coils are wound on each other. Reason (R): The flux linkage between two coils is maximum when they are wound on each other.

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

Assertion (A): In photoelectric effect, the kinetic energy of the emitted photoelectrons increases with increase in the intensity of the incident light. Reason (R): Photoelectric current depends on the wavelength of t...

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

A moving electron and a moving proton have the same de Broglie wavelength $\lambda$. This implies they have the same:

A. momentum

B. angular momentum

C. speed

D. energy

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

Two beams, A and B, whose photons have energies 3.3 eV and 11.3 eV respectively, illuminate a metallic surface (work function 2.3 eV) successively. Find the ratio of the maximum speed of electrons emitted due to beam ...

A. 3

B. 9

C. 1/3

D. 1/9

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#13 Class 12 Physics Semiconductor 2024 Mcq 1M

Ge is doped with As. Due to this doping, what happens?

A. the structure of Ge lattice is distorted.

B. the number of conduction electrons increases.

C. the number of holes increases.

D. the number of conduction electrons decreases.

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#14 Class 12 Physics Atoms 2024 Mcq 1M

Which electron transition gives rise to the second spectral line of the Balmer series in the hydrogen spectrum?

A. $n_f=2,\ n_i=3$

B. $n_f=3,\ n_i=4$

C. $n_f=2,\ n_i=4$

D. $n_f=2,\ n_i=\infty$

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#15 Class 12 Physics Electromagnetic Waves 2024 Mcq 1M

In four regions I, II, III and IV, the electric fields are described as: Region I: $E_x=E_0\sin(kz-\omega t)$; Region II: $E_x=E_0$; Region III: $E_x=E_0\sin kz$; Region IV: $E_x=E_0\cos kz$. In which region will disp...

A. I

B. IV

C. II

D. III

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#16 Class 12 Physics Alternating Current 2024 Mcq 1M

The reactance of a capacitor of capacitance $C$ connected to an ac source of frequency $\omega$ is $X$. If the capacitance is doubled and the frequency of the source is tripled, what does the reactance become?

A. $X/6$

B. $6X$

C. $2X/3$

D. $3X/2$

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

A 10 cm long wire lies along the y-axis. It carries a current of 1.0 A in the positive y-direction. A magnetic field $\vec B = (5\ mT)\hat j - (8\ mT)\hat k$ exists in the region. Find the force on the wire.

A. $(0.8\ mN)\hat i$

B. $-(0.8\ mN)\hat i$

C. $(80\ mN)\hat i$

D. $-(80\ mN)\hat i$

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

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

A. move along x-axis

B. move along y-axis

C. shrink

D. expand

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#19 Class 12 Physics Current Electricity 2024 Mcq 1M

Consider the circuit shown in the figure: an EMF of 12 V with an internal resistor of $1\ \Omega$ and an EMF of 6 V with an internal resistor of $0.5\ \Omega$ are connected in parallel between points A and B. What is ...

A. 6 V

B. 8 V

C. 9 V

D. 12 V

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

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

A. $10^{-2}$ J

B. $10^{-3}$ J

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

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

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