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Physics · PYQ NEET UG 2021
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Physics · PYQ NEET UG 2021
From a circular ring of mass 'M' and radius 'R' an arc corresponding to a \( 90^\circ \) sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is 'K' times 'MR^2'. Then the value of 'K' is:
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Twenty seven drops of same size are charged at \( 220 \text{ V} \) each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
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A series LCR circuit containing \( 5.0 \text{ H} \) inductor, \( 80 \mu\text{F} \) capacitor and \( 40 \,\Omega \) resistor is connected to \( 230 \text{ V} \) variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:
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Two charged spherical conductors of radius \( R_1 \) and \( R_2 \) are connected by a wire. Then the ratio of surface charge densities of the spheres (\( \sigma_1 / \sigma_2 \)) is:
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The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \( \frac{d}{2} \), then the viscous force acting on the ball will be:
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A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle '\( \theta \)' to the horizontal, the maximum height attained by it equals 4R. The angle of projection, \( \theta \), is then given by:
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A parallel plate capacitor has a uniform electron field \( \vec{E} \) in the space between the plates. If the distance between the plates is 'd' and the area of each plate is 'A', the energy stored in the capacitance is: (\( \varepsilon_0 \) = permittivity of free space)
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A capacitor of capacitance \( C \) is connected across an AC source of voltage \( V \), given by \( V = V_0 \sin\omega t \). The displacement current between the plates of the capacitor, would then be given by:
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Find the value of the angle of emergence from the prism. Refractive index of the glass is \( \sqrt{3} \).
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A radioactive nucleus \( {}^A_Z X \) undergoes spontaneous decay in the sequence \( {}^A_Z X \rightarrow {}_{Z-1} B \rightarrow {}_{Z-3} C \rightarrow {}_{Z-2} D \), where \( Z \) is the atomic number of element \( X \). The possible decay particles in the sequence are:
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If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.
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Three resistors having resistances \( r_1 \), \( r_2 \) and \( r_3 \) are connected as shown in the given circuit. The ratio \( \frac{i_3}{i_1} \) of currents in terms of resistances used in the circuit is: \( r_1 \)<\text{>\( r_2 \)<\text{>\( r_3 \)<\text{>\( i_1 \)<\text{>\( i_3 \)<\text{>
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Polar molecules are the molecules:
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A car starts from rest and accelerates at \( 5\text{ m/s}^2 \). At \( t = 4\text{ s} \), a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at \( t = 6\text{ s} \)? (Take \( g = 10\text{ m/s}^2 \))
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Match List-I with List-II: List-I List-II A Root mean square speed of gas molecules P \( \frac{1}{3}nm\bar{v}^2 \) B Pressure exerted by ideal gas Q \( \sqrt{\frac{3RT}{M}} \) C Average kinetic energy of a molecule R \( \frac{5}{2}RT \) D Total internal energy of 1 mole of a diatomic gas S \( \frac{3}{2}k_BT \)
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A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be:
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If E and G respectively denote energy and gravitational constant, then \( \frac{E}{G} \) has the dimensions of:
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An electromagnetic wave of wavelength '\( \lambda \)' is incident on a photosensitive surface of negligible work function. If '\( m \)' mass is of photoelectron emitted from the surface has de-Broglie wavelength \( \lambda_d \) then:
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The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is: Which of the above statements is/are correct?
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A ball of mass \( 0.15 \text{ kg} \) is dropped from a height \( 10 \text{ m} \), strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (\( g = 10 \text{ m/s}^2 \)) nearly:
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A step down transformer connected to an ac mains supply of \( 220 \text{ V} \) is made to operate at \( 11 \text{ V}, 44 \text{ W} \) lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?
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An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of potential difference 'V' volts as shown in figure. Potential difference across L, C and R is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCR series circuit is \( 10\sqrt{2} \) A. The impedance of the circuit is:
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