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PRELIM EXAMINATION 2022 23 ANSWER KEY Grade: 10 Subject : PHYSICS Date: 4/1/24 Max. Marks: 80 Dur. : 2 Hours Number of printed pages : 8 SECTION A : Answer all questions in this section QUESTION 1 15 (i) . Which of the following is true about resistors connected in parallel? (a) The p.d. across each resistor is equal (b) total resistance increases (c) An equal amount of current flows through each resistor (d) All of the above (ii). The electric meter records the consumption of (a) Charge (b) Current (c) Energy (d) Power (iii). When a body vibrates under the influence of an external periodic force, the vibrations are (a) Free vibrations (b) Forced vibrations (c) Resonant vibrations (d) None of the above (iv). 200 g of ice at 0 C needs _________ heat to melt. [Sp. latent heat of ice = 336000 J kg-1] (a) 6720 J (b) 67200 J (c) 672000 J (d) 67.2 J (v). In the circuit given alongside, the current through the resistor R is, (a) 0.01A (b) 0.02A (c) 0.04A (d) 0.05A (vi). The radiation with maximum penetrating power is: (a) (b) (c) X-radiation (d) (vii). Which one of the following statements is correct? (a) Live wire has zero potential (b) Potential of live and earth wire is always the same. (c) Fuse is connected in a neutral wire (d) Earth wire is used to prevent electric shock. (viii).Ram and Amit each having mass of 45kg reach the fourth floor of a building in time 4s and 5s respectively. The ratio of their power consumed is, (a) 4:5 (b) 5:4 (c) 1:1 (d) None of the above. 1
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