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Physics · PYQ NEET UG 2025
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Physics · PYQ NEET UG 2025
A particle of mass \( m \) is moving around the origin with a constant force \( F \) pulling it towards the origin. If Bohr model is used to describe its motion, the radius \( r \) of the \( n^{\text{th}} \) orbit and the particle's speed \( v \) in the orbit depend on \( n \) as
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There are two inclined surfaces of equal length (\( L \)) and same angle of inclination \( 45^\circ \) with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down on rough surface than on the smooth surface. The coefficient of kinetic friction (\( \mu_k \)) between the object and the rough surface is close to
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An electron (mass \( 9 \times 10^{-31}\text{ kg} \) and charge \( 1.6 \times 10^{-19}\text{ C} \)) moving with speed \( c/100 \) (\( c = \) speed of light) is injected into a magnetic field \( \vec{B} \) of magnitude \( 9 \times 10^{-4}\text{ T} \) perpendicular to its direction of motion. We wish to apply an uniform electric field \( \vec{E} \) together with the magnetic field so that the electron does not deflect from its path. Then (speed of light \( c = 3 \times 10^8\text{ ms}^{-1} \))
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A constant voltage of \( 50\text{ V} \) is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is :
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In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power (\( p \)) and magnification (\( m \)) for each lens will be, respectively -
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A \( 2\text{ amp} \) current is flowing through two different small circular copper coils having radii ratio \( 1:2 \). The ratio of their respective magnetic moments will be
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An unpolarized light beam travelling in air is incident on a medium of refractive index \( 1.73 \) at Brewster's angle. Then-
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A full wave rectifier circuit with diodes \( (D_1) \) and \( (D_2) \) is shown in the figure. If input supply voltage \( V_{\text{in}} = 220 \sin(100\pi t) \) volt, then at \( t = 15\text{ msec} \)
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The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes \( n = 2 \rightarrow n = 3 \) and \( n = 4 \rightarrow n = 6 \) transitions, respectively, is
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Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?
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A bob of heavy mass \( m \) is suspended by a light string of length \( l \). The bob is given a horizontal velocity \( v_0 \) as shown in figure. If the string gets slack at some point \( P \) making an angle \( \theta \) from the horizontal, the ratio of the speed \( v \) of the bob at point \( P \) to its initial speed \( v_0 \) is:
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De-Broglie wavelength of an electron orbiting in the \( n = 2 \) state of hydrogen atom is close to (Given Bohr radius = \( 0.052\text{ nm} \))
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Two gases \( A \) and \( B \) are filled at the same pressure in separate cylinders with movable pistons of radius \( r_A \) and \( r_B \), respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas \( A \) and \( B \) are displaced by \( 16\text{ cm} \) and \( 9\text{ cm} \), respectively. If the change in their internal energy is the same, then the ratio \( r_A / r_B \) is equal to
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A physical quantity \( P \) is related to four observations \( a \), \( b \), \( c \) and \( d \) as follows: \( P = \frac{a^3 b^2}{c \sqrt{d}} \). The percentage errors of measurement in \( a \), \( b \), \( c \) and \( d \) are \( 1\% \), \( 3\% \), \( 2\% \), and \( 4\% \) respectively. The percentage error in the quantity \( P \) is
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The current passing through the battery in the given circuit, is:
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A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is :
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A pipe open at both ends has a fundamental frequency \( f \) in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to :
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The electric field in a plane electromagnetic wave is given by \( E_z = 60\cos(5x + 1.5 \times 10^9 t)\text{ V/m} \). Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field) :
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To an ac power supply of \( 220\text{ V} \) at \( 50\text{ Hz} \), a resistor of \( 20\ \Omega \), a capacitor of reactance \( 25\ \Omega \) and an inductor of reactance \( 45\ \Omega \) are connected in series. The corresponding current in the circuit and the phase angle between the current and the voltage is, respectively -
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AB is a part of an electrical circuit (see figure). The potential difference "\( V_A - V_B \)", at the instant when current \( i = 2\text{ A} \) and is increasing at a rate of \( 1\text{ amp / second} \) is:
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