Tiêu đề NEET LIKE MOCK- 1 PHYSICS.pdf ✅

14. The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is: XII/ Practical Skills (1) 10 (2) 10−6 (3) 106 (4) 100 15. Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area A and wire 2 has cross-sectional area 9A. If the length of wire 1 increases by Δx on applying force F, how much force is needed to stretch wire 2 by the same amount? [New NCERT/XI/170] (1) 16F (2) 25F (3) 81F (4) 64F 16. The relative velocity of two parallel layers of water is 8 cm/sec. If the perpendicular distance between the layers is 0.1 cm . Then velocity gradient will be [New NCERT/XI/191] (1) 80/sec (2) 60/sec (3) 50/sec (4) 40/sec 17. Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [New NCERT/XII/264] (1) 5I and I (2) 5I and 3I (3) 9I and I (4) 9I and 3I 18. A steel ball of mass 5 g is thrown downward with velocity 10 m/s from height 19.5 m . It penetrates sand by 50 cm. The change in mechanical energy will be ( g = 10 m/s 2 ) [New NCERT/XI/79] (1) 1 J (2) 1.25 J (3) 1.5 J (4) 1.75 J 19. The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A, B, C, D and E. Transition A, B and C respectively represent [Old NCERT/XII/429] (1) first member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series (2) ionization potential of hydrogen, second spectral line of Balmer series, third spectral line of Paschen series (3) series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series (4) series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series 20. A student noticed the following readings while measuring the internal diameter of a tube with a vernier callipers: [XI/ Practical Skills] Reading of main scale (in cm) = 1.9 Reading of vernier scale ( in cm) = 0.04 Positive zero error (in cm ) = 0.01 The value of the internal diameter is (1) 1.93 cm (2) 1.95 cm (3) 1.85 cm (4) 1.87 cm 21. If in a p-n junction diode, a square input signal of 10 V is applied as shown [New NCERT/XII/336] Then the output signal across RL will be (1) (2) (3) (4) 22. Two identical metal wires of thermal conductivities K1 and K2 respectively are connected in series. The effective thermal conductivity of the combination is: [New NCERT/XI/216] (1) 2 K1 K2 K1+K2 (2) K1 K2 2 K1 K2 (3) K1+K2 K1 K2 (4) K1 K2 K1+K2 23. If an electron and a proton having same momenta enter perpendicular to a magnetic field, then [New NCERT/XII/112] (1) curved path of electron and proton will be same (ignoring the sense of revolution) (2) they will move undeflected (3) curved path of electron is more curved than that of the proton (4) path of proton is more curved 24. Assertion: The temperature of a gas is −73∘C.

Section-B 36. When the incidence angle is equal to the angle of emergence of light from the prism the refracted ray inside the prism [New NCERT/XII/240] (1) becomes parallel to the right face of prism (2) becomes perpendicular to the base of prism (3) becomes parallel to the base of prism (4) becomes perpendicular to the left face of prism 37. In a photoelectric effect experiment, for radiation with frequency v0 with hv0 = 8eV, electrons are emitted with energy 2 eV . What is the energy of the electrons emitted for incoming radiation of frequency 1.25v0 ? [New NCERT/XII/291] (1) 1 Ev (2) 3.25 eV (3) 4 eV (4) 9.25 eV . 38. Which of the following statement is not true regarding Einsteins mass energy relation? [New NCERT/XII/310] (1) Mass disappears to reappear as energy. (2) Energy disappears to reappear as mass. (3) Mass and energy are two different forms of the same entity. (4) Mass and energy can never be related to each other. 39. From Brewster's law of polarization, it follows that the angle of polarization depends upon [NCERT/XII/381] (1) the wavelength of light (2) plane of polarisation's orientation (3) plane of vibration's orientation (4) None of these 40. Three particles, each of mass m gram, are situated at the vertices of an equilateral triangle ABC of side lcm (as shown in the figure). The moment of inertia of the system about a line AX perpendicular to AB and in the plane of ABC , in gram- cm2 units will be [New NCERT/XI/114] (1) 3 2 ml 2 (2) 3 4 ml 2 (3) 2 ml 2 (4) 5 4 ml 2 41. In some region, gravitational field is zero. Gravitational potential in this region. [New NCERT/XI/135] (1) must be variable (2) must be constant (3) cannot be zero (4) must be zero 42. A unit charge moves on an equipotential surface from a point A to point B, then [New NCERT/XII/54] (1) VA − VB = +ve (2) VA −VB = 0 (3) VA − VB = −ve (4) it is stationary 43. Susceptibility of ferromagnetic substance is [New NCERT/XII/149] (1) > 1 (2) < 1 (3) 0 (4) 1 44. In an ac generator, a rectangular coil of 100 turns each having area 14 × 10−2 m2 is rotated at 360rev/min about an axis perpendicular to a uniform magnetic field of magnitude 3.0 T. The maximum value of the emf produced will be (Take π = 22 7 ) [New NCERT/XII/171] (1) 1584 V (2) 1684 V (3) 1768 V (4) 1968 V 45. A soap film of surface tension 3 × 10−2 formed in a rectangular frame cam support a straw as shown in Fig. If g = 10 ms−12, the mass of the straw is [New NCERT/XI/194] (1) 0.006 g (2) 0.06 g (3) 0.6 g (4) 6 g 46. Given below are two statements: In the light of the given statements, choose the correct answer from the options given. Statement I: Density of all the nuclei is same. Statement II: Radius of nucleus is directly proportional to the cube root of mass number. [New NCERT/XII/309] (1) Both statement I and II are correct. (2) Both statement I and II are incorrect. (3) Statement I is correct but statement II is incorrect. (4) Statement II is correct but statement I is incorrect. 47. What will be the frequency of beats formed from the superposition of two harmonic waves shown below? [New NCERT/XI/294] (1) 20 Hz (2) 11 Hz (3) 9 Hz (4) 2 Hz 48. As per the law of equi-partition of energy each vibrational mode gives how many degrees of freedom? [New NCERT/XI/252] (1) 1 (2) 2 (3) 3 (4) 0 49. In planetary motion the areal velocity of position vector of a planet depends on angular velocity (ω) and the distance of the planet from sun (r). If so, the correct