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Physics · PYQ NEET UG 2020
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Physics · PYQ NEET UG 2020
A resistance wire connected in the left gap of a metre bridge balances a \( 10\ \Omega \) resistance in the right gap at a point which divides the bridge wire in the ratio \( 3 : 2 \). If the length of the resistance wire is \( 1.5\text{ m} \), then the length of \( 1\ \Omega \) of the resistance wire is:
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A spherical conductor of radius \( 10\text{ cm} \) has a charge of \( 3.2 \times 10^{-7}\text{ C} \) distributed uniformly. What is the magnitude of electric field at a point \( 15\text{ cm} \) from the centre of the sphere? (\( \frac{1}{4\pi\varepsilon_0} = 9 \times 10^9\text{ Nm}^2/\text{C}^2 \))
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A charged particle having drift velocity of \( 7.5 \times 10^{-4}\text{ m s}^{-1} \) in an electric field of \( 3 \times 10^{-10}\text{ Vm}^{-1} \), has a mobility in \( \text{m}^2\text{ V}^{-1}\text{ s}^{-1} \) of:
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Light of frequency \( 1.5 \) times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?
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Light with an average flux of \( 20\text{ W/cm}^2 \) falls on a non-reflecting surface at normal incidence having surface area \( 20\text{ cm}^2 \). The energy received by the surface during time span of \( 1\text{ minute} \) is
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The colour code of a resistance is given below: Yellow Violet Brown Gold. The values of resistance and tolerance, respectively, are:
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The mean free path for a gas, with molecular diameter d and number density n can be expressed as:
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In a certain region of space with volume \( 0.2\text{ m}^3 \), the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is:
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The increase in the width of the depletion region in a p-n junction diode is due to:
Read answer →Physics · PYQ NEET UG 2020
तांबे (copper) के लिए प्रतिरोधकता (\( \rho \)) का तापमान (\( T \)) के साथ परिवर्तन निम्नलिखित में से कौन सा ग्राफ प्रदर्शित करता है?
Read answer →Physics · PYQ NEET UG 2020
The capacitance of a parallel plate capacitor with air as medium is \( 6\ \mu\text{F} \). With the introduction of a dielectric medium, the capacitance becomes \( 30\ \mu\text{F} \). The permittivity of the medium is: (\( \varepsilon_0 = 8.85 \times 10^{-12}\text{ C}^2\text{N}^{-1}\text{m}^{-2} \))
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In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency \( 6\text{ Hz} \). When tension in B is slightly decreased, the beat frequency increases to \( 7\text{ Hz} \). If the frequency of A is \( 530\text{ Hz} \), the original frequency of B will be:
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Taking into account of the significant figures, what is the value of \( 9.99\text{ m} - 0.0099\text{ m} \)?
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Two particles of mass \( 5\text{ kg} \) and \( 10\text{ kg} \) respectively are attached to the ends of a rigid rod of length \( 1\text{ m} \) with negligible mass. The centre of mass of the system from the \( 5\text{ kg} \) particle is nearly at a distance of:
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For which one of the following, Bohr model is not valid?
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An electron is accelerated from rest through a potential difference of \( V \) volt. If the de Broglie wavelength of the electron is \( 1.227 \times 10^{-2}\text{ nm} \), the potential difference is:
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For the logic circuit shown, the truth table is:
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Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is:
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A cylinder contains hydrogen gas at pressure of 249 kPa and temperature \( 27\ ^\circ\text{C} \). Its density is: (\( R = 8.3\text{ J mol}^{-1}\text{ K}^{-1} \))
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