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Physics · PYQ NEET UG 2026
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Physics · PYQ NEET UG 2026
A ray of light with wavelength \( \lambda \) is incident on three different photoelectric cells namely 1, 2 and 3. The threshold wavelength of these photoelectric cells are \( \lambda_1 \), \( \lambda_2 \), and \( \lambda_3 \), respectively and the magnitude of stopping potentials of these cells are \( V_1 \), \( V_2 \) and \( V_3 \), respectively. The relation between \( \lambda \) and threshold wavelengths are \( \lambda_1 < \lambda \), \( \lambda_2 > \lambda \) and \( \lambda_3 \gg \lambda \). The correct option is :
Read answer →Physics · PYQ NEET UG 2026
An ac voltage $V = 220 \sin(2 \times 10^3 t)$ Volt is applied to a series LCR circuit. Then the current amplitude in this circuit is : (Given : $L = 10$ mH, $C = 25$ $\mu$F, $R = 100$ $\Omega$)
Read answer →Physics · PYQ NEET UG 2026
The mean free path of molecules in an ideal gas A is half that of another ideal gas B. The diameter of the spherical molecules of gas A is twice the diameter of the molecules of B. If number densities of the gases A and B are \( n_A \) and \( \nu_B \), respectively, then the correct option is :
Read answer →Physics · PYQ NEET UG 2026
Water flows in a streamline motion through a horizontal pipe of circular cross-section as shown in the figure. The pressure difference of water between \( P \) and \( Q \) is \( 15 \text{ Nm}^{-2} \). The area of cross-section at \( P \) and \( Q \) are \( 40 \text{ cm}^2 \) and \( 20 \text{ cm}^2 \), respectively. The rate of flow of water through the pipe, in \( ext{cm}^3\text{s}^{-1} \), is : [Take density of water \( = 1000 \text{ kg m}^{-3} \)]
Read answer →Physics · PYQ NEET UG 2026
Consider a long solenoid of length $l$ and radius $r$. If $n$ is the number of turns per unit length and $\mu_0$ is the permeability of free space, the inductance of the solenoid is :
Read answer →Physics · PYQ NEET UG 2026
The lens combination as shown in the figure, consists of two lenses, $L_1$ and $L_2$, of the focal lengths $+10$ cm and $-10$ cm, respectively. The position of the image formed is :
Read answer →Physics · PYQ NEET UG 2026
An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, ( \epsilon_r = 9 ), has the electric field, ( E_x = E_0 \sin(kz - 2\pi \times 10^6 t) \text{ Vm}^{-1} ) where ( E_0 ) is the amplitude and ( k ) is the wave vector. Among the following options, the incorrect choice is :
Read answer →Physics · PYQ NEET UG 2026
A photon and an electron, each of \( 20\text{ eV} \) energy, move in free space. The ratio of linear momentum of electron \( p_e \) to that of photon \( p_{\text{ph}} \) (\( \frac{p_e}{p_{\text{ph}}} \)) is: \n(Take speed of light \( = 3 \times 10^8\text{ ms}^{-1} \), charge of electron \( = -1.6 \times 10^{-19}\text{ C} \) and mass of electron \( = 9 \times 10^{-31}\text{ kg} \))
Read answer →Physics · PYQ NEET UG 2026
A car travels on a circular racetrack of radius ( 50 \text{ m} ), which is banked at an angle ( \theta ). If the car travels at a speed ( 10 \text{ ms}^{-1} ), then the wear and tear on its tyres is minimum. Taking the acceleration due to gravity to be ( 10 \text{ ms}^{-2} ), the value of ( \theta ) is :
Read answer →Physics · PYQ NEET UG 2026
An ideal gas is made of polyatomic molecules. Each of the molecules has three translational, three rotational and \( f \) number of vibrational modes. If the ratio of heat capacities \( C_P/C_V \) of the gas is \( 8/7 \), then the value of \( f \) is :
Read answer →Physics · PYQ NEET UG 2026
Which of the following measurements require 'index correction'?
Read answer →Physics · PYQ NEET UG 2026
A point charge Q is placed inside a cavity within a solid isolated conducting sphere. Consider points A, B and C as shown in the figure, where the magnitudes of the electric fields are E_A, E_B and E_C, respectively. The points B and C are at the same distance from the center of the solid sphere. The correct option is :
Read answer →Physics · PYQ NEET UG 2026
A unit positive point charge is taken slowly through an infinitesimally thin tube that is inside a charged dielectric sphere of radius \( R \), having uniform positive charge density \( \rho \), as shown in the figure. The initial and final positions of the charge are marked by \( A \) and \( B \) at distances \( 2R \) and \( 3R \) respectively, from the centre of the sphere. In this process, the magnitude of the total work done on the point charge is \( \frac{\rho R^2}{n \varepsilon_0} \). The value of \( n \) is : (\( \varepsilon_0 \) is the permittivity of vacuum)
Read answer →Physics · PYQ NEET UG 2026
गीगर-मार्सन प्रयोग में, प्रकीर्णित \( \alpha \)-कणों की संख्या \( N(\theta) \) को प्रकीर्णन कोण \( \theta \) के फलन के रूप में आरेखित किया गया है। निम्नलिखित में से कौन सा विकल्प सही आरेख को दर्शाता है ?
Read answer →Physics · PYQ NEET UG 2026
The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are
Read answer →Physics · PYQ NEET UG 2026
A solid sphere $A$ of radius $R$ and mass $M$ is attached at a point to a smaller solid sphere $B$ of radius $r < R$ and mass $m < M$. Assume that the line joining their centres lies along the horizontal. The moment of inertia of the system calculated about a vertical axis passing through the centre of $A$ is $I_A$ and that calculated about a vertical axis passing through the centre of $B$ is $I_B$. The difference $I_A - I_B$ is :
Read answer →Physics · PYQ NEET UG 2026
प्रकाश का एक पुंज किसी धातु की सतह पर इस प्रकार गिरता है कि प्रकाश-इलेक्ट्रॉन उत्पन्न होते हैं। यदि प्रकाश स्रोत की शक्ति समय $t$ के साथ रैखिक रूप से घटने लगती है, तो फोटोकरंट $I$ और निरोध विभव के परिमाण $|V|$ का समय के साथ परिवर्तन किसके द्वारा सर्वोत्तम रूप से दर्शाया जाता है :
Read answer →Physics · PYQ NEET UG 2026
Consider that an electron is revolving in an excited state of Hydrogen atom with velocity ( \sqrt{25.6} \times 10^5 \text{ ms}^{-1} ). The radius of the orbit is ( x \times 10^{-9} \text{ m} ). The value of ( x ) is : [Take the mass of electron to be ( 9 \times 10^{-31} \text{ kg} ), charge of electron ( = -1.6 \times 10^{-19} \text{ C} ) and ( \frac{1}{4\pi \epsilon_0} = 9 \times 10^9 \text{ N m}^2 \text{ C}^{-2} )]
Read answer →Physics · PYQ NEET UG 2026
Two planets \( P_1 \) and \( P_2 \) with equal mass have radii \( R_1 \) and \( R_2 \), respectively, where \( R_2 = \frac{R_1}{2} \). The escape speeds of \( P_1 \) and \( P_2 \) are \( v_1 \) and \( v_2 \), respectively. Then \( \frac{v_2}{v_1} \) is :
Read answer →Physics · PYQ NEET UG 2026
Consider that ( \sigma_s ), ( k_B ), ( b ) represent Stefan-Boltzmann constant, Boltzmann constant and Wien's displacement law constant, respectively. The dimension of ( \sigma_s k_B^{-1} b ) is :
Read answer →Physics · PYQ NEET UG 2026
A cylindrical cork of uniform density floats in a liquid of density \( \rho_1 \). If the cork is depressed slightly and released, it oscillates harmonically with time period \( T \). If the same cork floats in another liquid of density \( \rho_2 \), then the similar oscillation has time period \( 2T \). The value of \( \rho_2/\rho_1 \) is :
Read answer →Physics · PYQ NEET UG 2026
An ideal Zener diode with breakdown voltage of -3 V is reverse biased with a negative input voltage ( V_i = -5\text{ V} ). The magnitude of voltage difference between points B and A is :
Read answer →Physics · PYQ NEET UG 2026
