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

Q. The energy required to break one bond in DNA is . This value in eV is nearly

NEET NEET 2020Electrostatic Potential and Capacitance Report Error

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Questions from NEET 2020

1. A ray is incident at an angle of incidence 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 . then the angle of incidence is nearly equal to:

Ray Optics and Optical Instruments

2. Two cylinders and of equal capacity are connected to each other via a stop clock. A contains an ideal gas at standard temperature and pressure. is completely evacuated. The entire system is thermally insulated. The stop clock is suddenly opened. The process is:

Thermodynamics

3. The energy equivalent of 0.5 g of a substance is:

Dual Nature of Radiation and Matter

4. 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?

Gravitation

5. The solids which have negative temperature coefficient of resistance are :

Semiconductor Electronics: Materials Devices and Simple Circuits

Questions from Electrostatic Potential and Capacitance

1. In the adjoining figure, the electric field lines for charges and are shown. Identify the sign of the charges.

NTA Abhyas 2020

2. A charge is distributed over two concentric conducting thin spherical shells radii and . If the surface charge densities on the two shells are equal, the electric potential at the common centre is :

JEE Main 2020

3. A little charged bead is inside the hollow frictionless sphere manufactured from the insulating material. Sphere has a diameter of . The mass of the bead is , its charge is . What minimum charge must carry an object at the bottom of the sphere to keep hold the charged bead at the vertex of the sphere in stable equilibrium?

NTA Abhyas 2020

4. The capacitance of an air capacitor is the separation between the parallel plates is . A copper plate of thickness is introduced symmetrically between the plates. The capacitance now becomes

5. Three capacitors of and are connected in series to a source. The charge on the capacitor is

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , 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 ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids

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