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Physics · PYQ NEET UG 2020
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Physics · PYQ NEET UG 2020
A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is \( \mu \), then the angle of incidence is nearly equal to:
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A \( 40\ \mu\text{F} \) capacitor is connected to a \( 200\text{ V} \), \( 50\text{ Hz} \) ac supply. The rms value of the current in the circuit is, nearly:
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The energy required to break one bond in DNA is \( 10^{-20}\text{ J} \). This value in eV is nearly:
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A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is (\( \mu_0 = 4\pi \times 10^{-7}\text{ T m A}^{-1} \))
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The Brewster’s angle \( i_b \) for an interface should be:
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A body weighs \( 72\text{ N} \) on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?
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A short electric dipole has a dipole moment of \( 16 \times 10^{-9}\text{ C m} \). The electric potential due to the dipole at a point at a distance of \( 0.6\text{ m} \) from the centre of the dipole, situated on a line making an angle of \( 60^\circ \) with the dipole axis is: \( (\frac{1}{4\pi\varepsilon_0} = 9 \times 10^9\text{ N m}^2/\text{C}^2) \)
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The quantities of heat required to raise the temperature of two solid copper spheres of radii \( r_1 \) and \( r_2 \) (\( r_1 = 1.5 r_2 \)) through \( 1\text{ K} \) are in the ratio:
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An iron rod of susceptibility \( 599 \) is subjected to a magnetising field of \( 1200\text{ A m}^{-1} \). The permeability of the material of the rod is: (\( \mu_0 = 4\pi \times 10^{-7}\text{ T m A}^{-1} \))
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For transistor action, which of the following statements is correct?
Read answer →Physics · PYQ NEET UG 2020
Dimensions of stress are:
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A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is:
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A wire of length L, area of cross section A is hanging from a fixed support. The length of the wire changes to \( L_1 \) when mass M is suspended from its free end. The expression for Young’s modulus is
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A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is \( 5\text{ g} \). Another capillary tube of radius \( 2r \) is immersed in water. The mass of water that will rise in this tube is:
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The solids which have the negative temperature coefficient of resistance are:
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Assume that light of wavelength \( 600\text{ nm} \) is coming from a star. The limit of resolution of telescope whose objective has a diameter of \( 2\text{ m} \) is
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The energy equivalent of 0.5 g of a substance is:
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Find the torque about the origin when a force of \( 3\hat{j}\text{ N} \) acts on a particle whose position vector is \( 2\hat{k}\text{ m} \).
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When a uranium isotope \( ^{235}_{\ 92}\text{U} \) is bombarded with a neutron, it generates \( ^{89}_{\ 36}\text{Kr} \), three neutrons and:
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A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage, is \( \frac{\pi}{3} \). If instead C is removed from the circuit, the phase difference is again \( \frac{\pi}{3} \) between current and voltage. The power factor of the circuit is:
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A ball is thrown vertically downward with a velocity of \( 20\text{ m/s} \) from the top of a tower. It hits the ground after some time with a velocity of \( 80\text{ m/s} \). The height of the tower is: (\( g = 10\text{ m/s}^2 \))
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The phase difference between displacement and acceleration of a particle in a simple harmonic motion is
Read answer →Physics · PYQ NEET UG 2020
