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Vision Classes, Jath, SUB: PHYSICS, STD: 12™ (scl) TIME : 3 Hrs, , , , , , MARKS : 70, , , , , , , , , , , , , Section A, Q.No.1 Select and write the correct answer:, , (i). A body performing uniform circular motion has constant, , (a) velocity (b) acceleration (c) kinetic energy (d) displacement, (ii). The spherical shape of rain-drop is due to, , (a) density of liquid (b) surface tension (c) atmospheric Pressure (d) gravity, (iii). “Good absorbers are also good emitters ” This statement is of, , (a) Newton’s law __(b) Kirchhoff’s law (c) Stefan’s law (d) Wien’s law, , , , (iv). The displacement of a particle performing linear harmonic motion in one, time period is, , (a)A (b) 2A (c) zero (d) 4A, (v). The dielectric constant of a conductor is, (a) unity (b) zero (c) infinite (d) one, , (vl). If the balancing point is obtained at 25 cm in a meter bridge, then the ratio of, resistance in the gap is, , (a) 1:3 (b) 2:3 (c) 1:4 (d) 4:3, , (vii). Biot Savart law is, , (a) inverse law (b) inverse square law (c) cubic law (d) converse law, (viii). Above Curie temperature, the ferromagnetic materials get converted into’, , (a) Dimagnetic (b) non-magnetic —(c) paramagnetic (d) ferromagne’, , , , (ix). What is the energy required to build up a current of 1 A in an in, mH?, , (a) 10 mJ, , , , , , , (b) 20 mJ
