NEET 2020 Phase 1 | NEET Year Wise Previous Years Questions

Biology

Chemistry

Physics

1. Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a 2. When a uranium isotope $$_{92}^{235}U$$ is bombarded with a neutron, it generates $$_{36}^{89}Kr$$ three neutrons and : 3. A short electric dipole has a dipole moment of 16 $$ \times $$ 10-9 Cm. The electric potential due to the dipole at a po 4. 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 n 5. 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 rad 6. For which one of the following, Bohr model is not valid? 7. 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 capi 8. 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 i 9. An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The permeability of the material of 10. The phase difference between displacement and acceleration of a particle in a simple harmonic motion is : 11. The energy equivalent of 0.5 g of a substance is : 12. A resistance wire connected in the left gap of a metre bridge balances a 10 $$\Omega $$ resistance in the right gap at 13. The average thermal energy for a mono-atomic gas is : (kB is Boltzmann constant and T absolute temperature) 14. The ratio of contributions made by the electric field and magnetic field components to the intensity of and electromagne 15. 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 ti 16. 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 sol 17. Taking into account of the significant figures, what is the value of $$9.99 m - 0.0099m$$? 18. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoele 19. The color code of a resistance is given below : The values of resistance and tolerance, respectively, are 20. 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 negligi 21. For transistor action, which of the following statements is correct? 22. The mean free path for a gas, with molecular diameter d and number density n can be expressed as : 23. A cylinder contains hydrogen gas at pressure 249 kPa and temperature 27$$^\circ $$CIts density is : (R = 8.3 J mol-1 K-1 24. 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 25. Dimensions of stress are : 26. 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 ma 27. In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. Whe 28. 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 fri 29. The capacitance of a parallel plate capacitor with air as medium is 6$$\mu $$F. With the introduction of a dielectric me 30. In Young's double slit experiment, if the separation between coherent sources is halved and the distance of the screen 31. Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. 32. Which of the following graph represents the variation of resistivity ($$\rho $$) with temperature (T) for copper? 33. The quantities of heat required to raise the temperature of two solid copper spheres of radii r1 and r2 (r1 = 1.5r2) thr 34. Find the torque about the origin when a force of 3 $$\hat j$$ N acts on a particle whose position vector is 2 $$\hat k$ 35. In a certain region of space with volume 0.2 m3, the electric potential is found to be 5 V throughout. The magnitude of 36. The Brewster's angle ib for an interface should be : 37. The increase in the width of the depletion region in a p-n junction diode is due to : 38. A spherical conductor of radius 10 cm has a charge of 3.2 $$ \times $$ 10-7 C distributed uniformly. That is the magnetu 39. The energy required to break one bond in DNA is 10-20 J. This value in eV is nearly : 40. A 40 $$\mu $$F capacitor is connected to a 200 V. 50 Hz ac supply. The rms value of the current on the circuit is, nearl 41. An electron is accelerated from rest through a potential difference of V volt. If the de-Broglie wavelength of the elect 42. Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard 43. For the logic circuit shown, the truth table is : 44. The solids which have the negative temperature coefficient of resistance are : 45. A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference betw

NEET 2020 Phase 1

MCQ (Single Correct Answer)

-1

If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 109 bp, then the length of the DNA is approximately