NEET 2020 Phase 1

A 40 \(\mu\)F capacitor is connected to a 200 V. 50 Hz ac supply. The rms value of the current on the circuit is, nearly :

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 \({\pi \over 3}\). If instead C is
removed from the circuit, the phase difference is again $...

The energy equivalent of 0.5 g of a substance is :

For which one of the following, Bohr model is not valid?

When a uranium isotope \(_{92}^{235}U\)
is bombarded with a neutron, it generates \(_{36}^{89}Kr\) three neutrons and :

The capacitance of a parallel plate capacitor with air as medium is 6\(\mu\)F. With the introduction of a dielectric medium, the capacitance become 30 \(\mu\)F The permittivity of the medium is :$$\left( {{\varepsilon _0} = 8.85 \times {{...

Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass.The centre of mass of the system from the 5 kg particle is nearly at a distance of :

The solids which have the negative temperature coefficient of resistance are :

The color code of a resistance is given below : The values of resistance and tolerance, respectively, are

A charged particle having drift velocity 7.5\(\times\)10-4 ms-1 in an electric field of 3\(\times\)10-10 Vm-1 has a mobility in m2 V-1s-1 of :

Which of the following graph represents the variation of resistivity (\(\rho\)) with temperature (T) for copper?

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 m, then the length o...

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 nm, the potential difference is :

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?

Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :

The ratio of contributions made by the electric field and magnetic field components to the intensity of and electromagnetic wave is : (c = speed of electromagnetic waves)

A spherical conductor of radius 10 cm has a charge of 3.2 \(\times\) 10-7 C distributed uniformly. That is the magnetude of electric field at a point 15 cm from the centre of the sphere?$$\left( {{1 \over {4\pi {\varepsilon _0}}} = 9 \tim...

A short electric dipole has a dipole moment of 16 \(\times\) 10-9 Cm. The electric potential due to the dipole at a point at a distance of 0.6 m from the centre of the dipole, situated on a line making an angle of \(60^\circ\) with the d...

In a certain region of space with volume 0.2 m3, the electric potential is found to be 5 V throughout. The magnitude of electric field in this region is :

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 i...

The Brewster's angle ib for an interface should be :

A body weighs 72 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?

The mean free path for a gas, with molecular diameter d and number density n can be expressed as :

The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T absolute temperature)

The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2 (r1 = 1.5r2) through 1 K are in the ratio :

A cylinder contains hydrogen gas at pressure 249 kPa and temperature 27\(^\circ\)CIts density is : (R = 8.3 J mol-1 K-1)

Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire systems is thermally insulated. The stop cock is sudden...

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 :

An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The permeability of the material of the rod is :\(\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}Tm{A^{ - 1}}} \right)\)

A ball is thrown vertically downward with a velocity of 20 m/s from the top of a tower. It hits the ground after some time with a velocity of 80 m/s. The height of the tower is : (g = 10 m/s2)

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 :\(\left( {{\mu _0} = 4\pi \times {{10}^{ - 7}}Tm{{A}^{-1}}} \right)\)

The phase difference between displacement and acceleration of a particle in a simple harmonic motion is :

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 g. Another capillary tube of radius 2r is immersed in Water. The mass of water that will rise in this tube is...

A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L1 when mass M is suspended from its free end. The expression for Young's modulus is :

Find the torque about the origin when a force of 3 \(\hat j\)
N acts on a particle whose position vector is 2 \(\hat k\) m.

For the logic circuit shown, the truth table is :

For transistor action, which of the following statements is correct?

The increase in the width of the depletion region in a p-n junction diode is due to :

The energy required to break one bond in DNA is 10-20 J. This value in eV is nearly :

Taking into account of the significant figures, what is the value of \(9.99 m - 0.0099m\)?

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 :

Dimensions of stress are :

Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is :

In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency of A is 530 Hz, the original freqnency of B will be :