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DELHIPUBLIC SCHOOL NEWTOWN SESSION 2024-25 PRE BOARD EXAMINATION FULL MARKS: 80 TIME: 2 HOURS CLASS: X SUBJECT: PHYSICS (SET A] Answers to this Paper must be written on the paper provided separately. You will hot be allowed towrite during the first 15 minutes. This time is to be spent inreading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. Section Ais compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets l): This paper consists of eight printedpages SECTION A Question 1 [15 x 1- 15] Choose the correct answers to the questions from the given options: (Donot copy the question, write the correct answers only.) (i) The diagrams below show 5N force is acting on a rod AB pivoted at A in different directions. ldentify the correct statement. SN 25 cm 25 cm (P) 25 cm B (R) (Q) SN 25 cm 5N (S) 5N (a)the moment of force in R is negative. (b) the magnitude of the moment of force is maximum in R. (eP and Q have opposite moments. (d) the magnitude of the moment of force is maximum in Pand Q. (i ) A solid cone A, a holow cone B, and a solid cylinder C, all have the same height of 12 cm. The positions of their centers of gravity from the base are calculated. Which of the following shows the correct sequence of the positions of the centers of gravity from the lowest to the highest? (b) B<A<C Va) A <B<C { i) The energy change that takes place in a thermocouple: (a) electrical to heat (b) mechanical to heat fo heat to electrical (c) heat to mechanical (iv) (d) A<C<B (c) C<A<B The adjacent diagram shows the movable block of a block and tackle system. The direction of effort is not specified. What could be the probable mechanical advantage of the system? (b) 5 (d) both (a) and (b) (c) 3 A/1
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