## ICSE Class 9 Physics Sample Question Paper 3 with Answers

ICSE Class 9 Physics Sample Question Paper 3 with Answers Section-1 (Attempt all questions from this section) Question 1. (a) A sensitive instrument can measure lengths up to an accuracy of 1 p. Upto how many decimal places would we express the result of a length measurement, done with this instrument, in cm ? (b) Define the astronomical unit (AU). Express it in metre. (c) Fill in the blanks : (i) The time interval between two successive passages of the earth, through the vernal equinox, is known as the ……………. (ii) The atomic unit of mass equals …………….  of the mass of an atom of the carbonisotope (d) Out of the following, which years would be leap years : 1952, 1966, 1978, 1992, 2000 ? (e) The length of a given second’s simple pendulum is increased to 4 times its original value. What would be its new time period ? Answer: (a) We have, 1 p = 10-6 m = 10-6 x 102 cm = 10-4 cm The least count of the instrument is therefore, 0.0001 cm. The results of measurements, done with this instrument, would be expressed up to four decimal places, in cm. (b) One astronomical unit (AU)…