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SMT SULOCHANADEVI SINGHANIA SCHOOL, THANE STD SUBJECT EXAM MARKS TIME NO OF PAGES DATE 10 PHYSICS PRELIM 80 2h 7 1811124 SECTION 1 ANSWER ALL THE QUESTIONS IN THIS SECTION Question 1-Choose the correct alternative: 1. The centre of gravity of a regular object would lie b. in the body a. on the body d. all the above c. outside the body (15) --- 2. Choose the correct meaning of the statement: "The efficiency of a machine is 60%". a. In the given machine M.A. > V.R. b.60 % of the total energy supplied is obtained as useful energy. c. 60. % of the total energy is lost in overcoming the force of friction. d.The power output is more than the power input. 'h' holds a heavy 3. A construction worker standing in the ground floor of a building of height worker in those the by done is work much How tool box of mass 'm' in his hand for 2 hours. two hours? a. mgh b. mv2 c. 2mgh d. zero 4. When a ray of light enters from denser _to rarer medium then: a. the light ray bends towards the normal _ b. the speed of light increases the angle of refraction than greater c. the angle of incidence is d. its wavelength decreases =0.9. If a light ray is 5. Refractive index of medium A with respect to medium Bis given as eJJA incident, making i >0 _from B to A. a. It will suffer only total internal reflection b. It will bend away from normal c. It will bend to,wards normal d. It will go _ undeviated abilities of alpha and 6~ Which row correctly shows the relative ionizing effects and penetrating beta particles? Ionising effect Penetrating ability a>f3 a>f3 B a>f3 a<l3 C a<f3 a>f3 D a<f3 a<l3 a. A b.B A . d.D c.C 1
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