Formatting page ...
Don Bosco Academy Pre-board Examination 2023-24 Total Marks: 80 Time: 2 hrs. Class-X Sub: Physics SECTION A Choose the correct answers to the questlons from the glven options (Do not copy the question, write the correct answers only) 0Essential characteristics of equilibrlum is zero (a) momentum is cqualto zero (b) acceleration is equal to zero is (d)velocity equal to (c) K.E is equal to zero The quantity remains unchanged, when a sound that phylcal () 15 1s IA 1 LS QUESTION1. we ppes from one tf the angle of incidence is iand angle of refraction r, then M A index nz. TE R medium to another is (c) wave length (d) frequency (b)speed (a) Amplitude a is (H)fthe speed of moving partide tripled, then the ratio of its kinetik energy to Its momentum will be (d) 4:1 (b) 3:1 (a) 2:1 c) 9:1 a n, a to of refractive medium ray of light travels from medium of refractive index (iv)A | equal to (a) n (b) n (c) n1 n, sinl sin r (d 4_ (v).Which of the following colours has more lateral displacement ? (c) green -(d) violet (b) blue (a) red waves (vi).The correct descending order of the electromagnetic according to their 2 wavelength is (a) UV-rays, y- rays, microwaves, infrared rays (b) Infrared rays, microwaves, UV-rays, y- rays (c) y-rays, UV-rays, infrared rays, microwaves d) Microwaves, infrared rays, UV-rays, Y-rays is @ IC SE _2 0 at which entire weight of the body can be supposed to be concentrated (c) centre of gravity (d) central point (b) centroid (a) end point converts (vii).Solar cell (a) Heat energy to mechanical energY (b) Electrical energy to light energy (c) Chemical energy to heat energy (d) Solar energy to electrical energy (vii). The point (x).A ray of light incident at an angle of 48 on a prism of refracting angle 60, suffers minimum deviation. The angle of minimum deviaion would be se) 36 (d) 480 (b) 240 (a) 120 a is (x).What is the magnification of the image when lens of focal length 10 cm and cm ? object distance from the lens is 15 (b) (c) 4 1 internalresistance 12 2. The potential differential across its terminals when it is supplying a current of 50 mA is (xi).A 9V battery has V (c) 9.06 V (d)9.6 V is most in The liquids for specific suitable of the folowing radiators car? heat capacity of the liquids are given (b) 8.4 (a) 8.94 V (xi). Which (a)4Jg-K- (b) 2.1 Jg-'K (b) 1500J Kg'Kd)2100) Kg-K (xii).The chain reaction is controlled by absorbing some of the neutrons emitted in the fission process by neans of: (c) sodium liquid metal(d) cadmium (a) Graphite (b) heavy water Contd to page - 2 @ICSE_2024_MATERIALS
|
