CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠PROPERTIES OF FLUIDS

A drop of liquid (volume 0.04 cm³) spreads between two glass slides forming a thin layer of area 20 cm². To separate the slides, a force of 16×10⁵ dyne is applied normal to the surfaces. The surface tension of the liquid is (dyne/cm):
(A) 60
(B) 70
(C) 80
(D) 90

Master Surface Tension and Excess Pressure with Numerical Tricks and PYQ Solving youtube.com/live/iM0OxgYiW9c

Exam Tip:
When solving surface tension problems, always remember separating two slides creates two new liquid surfaces. That’s why the factor of 2 appears in the energy equation (Surface energy = 2 × T × Area). Many students forget this and end up with half the correct value. So, whenever you see “two plates/slides with liquid film,” immediately think double surface → multiply by 2. This shortcut saves time and avoids silly mistakes in NEET exams.

3 hours ago | [YT] | 1

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠DUAL NATURE

Photons absorbed in matter are converted to heat. A source emitting n photons/sec of frequency ν is used to convert 1 kg of ice at 0 °C to water at 0 °C. Then, the time T taken for the conversion:


(a) decreases with increasing n, with ν fixed
(b) decreases with n fixed, ν increasing
(c) remains constant with n and ν changing such that nν = constant
(d) increases when the product nν increases


Answer: (c) –

3 hours ago | [YT] | 1

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 ELECTROSTTAICS

An electron is placed at a distance d = 0.1 nm in front of a metallic infinite plane surface. The force of attraction is given by
F = (1/4) × (q² / (4πϵ₀ d²))
What is the work required (in eV) to move the electron to infinity?
(a) 3.6 eV
(b) 7.2 eV
(c) 14.4 eV
(d) 28.8 eV

The "Infinity" Secret of Electrostatic Potential Energy https://youtu.be/AB0uUhurweo

4 hours ago | [YT] | 4

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

Two particles A and B have de Broglie wavelengths λ₁ and λ₂. They combine to form particle C in one‑dimensional motion. Momentum is conserved. What is the de Broglie wavelength of particle C?
(A) h / (p₁ + p₂)
(B) λ₁ + λ₂
(C) (λ₁ λ₂) / (λ₁ + λ₂)
(D) Depends only on mass of C

4 hours ago | [YT] | 1

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter


A particle moves in a closed orbit around the origin under a central force directed towards the origin. Its de Broglie wavelength varies cyclically between two values λ₁ and λ₂, with λ₁ > λ₂. Which statements are correct?


(A) Particle could be in a circular orbit with origin as centre
(B) Particle could be in an elliptic orbit with origin as focus
(C) When λ = λ₁, particle is nearer the origin than when λ = λ₂
(D) When λ = λ₂, particle is nearer the origin than when λ = λ₁

4 hours ago | [YT] | 0

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

A source emits n photons/sec of frequency ν. These photons are absorbed by 1 kg of ice at 0 °C to convert it into water at 0 °C. The time T required for conversion depends on:


(A) decreases with increasing n (ν fixed)
(B) decreases with increasing ν (n fixed)
(C) remains constant if nν = constant
(D) increases when nν increases

4 hours ago | [YT] | 1

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

A particle A of mass mₐ moves with velocity v and collides elastically in one dimension with particle B of mass mᵦ at rest. What happens to the de Broglie wavelength of particle A after collision?


(A) λ increases
(B) λ decreases
(C) λ remains same
(D) λ changes depending on mᵦ

Dual Nature of Matter One Shot: De Broglie Waves Full Concept for NEETyoutube.com/live/UTo-_ixYSPI

4 hours ago | [YT] | 0

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

In practice, why is two‑photon absorption not considered while discussing stopping potential in photoelectric effect experiments?
(A) It never occurs
(B) Probability is negligible under normal light intensity
(C) It changes φ₀
(D) It doubles stopping potential

Dual Nature of Matter One Shot: De Broglie Waves Full Concept for NEETyoutube.com/live/UTo-_ixYSPI


In the photoelectric effect, the standard assumption is that one photon interacts with one electron. The photon’s energy hν is either sufficient to overcome the work function φ₀ and release the electron, or it isn’t.


Now, in principle, an electron could absorb two photons simultaneously (multi‑photon absorption). That would give it energy 2hν − φ₀. But here’s the catch:


• Probability factor: The chance that two photons strike the same electron at the exact same instant is extremely small under normal laboratory light intensities.
• Experimental conditions: NEET/NCERT discussions assume ordinary light sources, not ultra‑intense lasers. At typical intensities, single‑photon events dominate overwhelmingly.
• Stopping potential measurement: Stopping potential is defined by the maximum kinetic energy of electrons in the usual single‑photon process. Since multi‑photon absorption is negligible, it doesn’t affect the observed stopping potential.
So the reason we don’t include two‑photon absorption in stopping potential analysis is not because it’s impossible, but because it’s statistically insignificant in the conditions relevant to NEET/NCERT physics.

4 hours ago | [YT] | 2

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

In the photoelectric effect, one photon of frequency ν transfers its energy to an electron, giving maximum kinetic energy Emax = hν − φ₀, where φ₀ is the work function. If instead the electron absorbs 2 photons of the same frequency ν, what will be its maximum kinetic energy?
(A) hν − φ₀
(B) 2hν − φ₀
(C) hν + φ₀
(D) 2hν + φ₀



Don't Fall for These 3 Photoelectric Effect Traps in NEET https://youtu.be/1juxTlocpZA

4 hours ago | [YT] | 2

CRACKNEETPhysics

🎯 Tricky NEET 2026 Sample MCQ – (NEET 2025 Like MCQ) 🧠 Dual Nature of Radiation and Matter

An electron moves with initial velocity v = v₀ î in a magnetic field B = B₀ ĵ. Its de Broglie wavelength:


(A) remains constant
(B) increases with time
(C) decreases with time
(D) increases and decreases periodically

4 hours ago | [YT] | 3