(ii) What is the least count of the screw gauge? Pendulum A will take more time (twice) in a given time because the time period of oscillation is directly proportional to the square root of the length of the pendulum. (b) The time period of oscillations of simple pendulum does not depend on the mass of the bob. of a screw gauge: The L.C. Measuring the internal diameter of a tube or a cylinder. It is important for students to go through the entire Maths syllabus before they begin their exam preparation. = (47 × 0.02) mm = 0.94 mm Diameter (Total reading) = M.s.r. APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 9 Physics Chapter 1 Measurements and Experimentation. One lunar month is the time in which the moon completes one revolution around the earth. Board – Indian Certificate of Secondary Education (ICSE), www.cisce.org The time ‘t’ for 20 complete oscillations is measured with the help of a stop watch. (b) If the acceleration due to gravity is reduced to one-fourth, Therefore, the time period is doubled. It will help them to memorize the process for the long run. What do you mean by zero error of a screw gauge? = Value of 1 m.s.d./number of divisions on the vernier scale = 1mm/20 = (0.1/20) cm = 0.005 cm, (ii) Main scale reading = 35 mm = 3.5 cm Since 4th division of the main scale coincides with the main scale, i.e. The main scale is graduated to read up to 1 mm and on vernier scale, the length of 10 divisions is equal to the length of 9 divisions on the main scale. When a screw gauge with a least count of 0.01 mm is used to measure the diameter of a wire, the reading on the sleeve is found to be 1 mm and the reading on the thimble is found to be 27 divisions. It is accounted by subtracting the zero error (with sign) from the observed reading in order to get the correct reading. How do you determine it? Math enables you to calculate the cost of an object while buying it. How does the time period (T) of a simple pendulum depend on its length (l)? Therefore, the pendulum B will have a greater time period and thus making lesser oscillations. In this position, the zero mark of the vernier scale is ahead of 1.2 cm mark on main scale. Let T1 and T2 be the time periods of the two pendulums of lengths l1 and l2, respectively. If the direction of rotation of the screw needs to be changed, then it should be stopped for a while and then rotated in the reverse direction. For example, for the scales shown, the least count is 0.01 cm and the 6th division of the vernier scale coincides with a main scale division. The least count of a metre rule is 1 cm. It is the least count of vernier callipers. The videos of ICSE Maths Class 9 provided will make the learning process easier. Download ICSE Specimen Papers 2020 Solved for Class 9 and Marking Scheme PDF. State the purpose of ratchet in a screw gauge. Two factors on which the time period of a simple pendulum does not depend are. Students are also enlightened with practical aspects of this unit such as the use of screw gauge and vernier callipers for the measurement of various physical quantities such as the thickness of a wire, the radius of cylinders etc. Then, we know that the time period is directly proportional to the square root of the length of the pendulum. You can further filter Question Bank Solutions by subjects and topics. of divisions on the circular scale = 50 (i) Pitch = Distance moved ahead in one revolution = 1 mm/1 = 1 mm. = 27 × 0.001 cm = 0.027 cm Diameter (Total reading) = M.s.r. Measuring the length of a small rod using vernier calipers: The rod whose length is to be measured is placed in between the fixed end and the vernier scale as shown in the figure. ‘The distance of a star form the earth is 8.33 light minutes .’ What do you mean by this statements ? of divisions on its circular scale. Measuring the length of a small rod using vernier calipers: The rod whose length is to be measured is placed in between the fixed end and the vernier scale as shown in the figure. Download Formulae Handbook For ICSE Class 9 and 10, Selina ICSE Solutions for Class 9 Physics Chapter 1 Measurements and Experimentation. These ICSE Board Sample Papers or Model Papers are useful to understand the pattern of questions asked in the board exam. Draw a neat diagram to represent it. The ratio of their time periods would be 1:1 because the time period does not depend on the weight of the bob. Section 1 is compulsory and has short answer questions on the entire syllabus. Astronomical unit (A.U.) The thickness of the wire could be determined from the reading as shown in the figure below. While measuring the length, the zero of the vernier lies just ahead of the 1.8 cm mark and the 4th division of vernier coincides with. Let the new time period be T’ and let g’ be the acceleration due to gravity. (b) If zero error of vernier callipers is -0.02 cm, Therefore, the vernier scale reading = 4 × 0.01 cm = 0.04 cm, Correct reading = Observed reading – Zero error (with sign). Performance & security by Cloudflare, Please complete the security check to access. (i) Oscillation: One complete to and fro motion of the pendulum is called one oscillation. Correct reading = Observed reading – zero error (with sign). unit of mass is ‘kilogramme’. Name the instrument which has the least count. Students can refer to these solutions whenever they have … The measurement of different ingredients plays a vital role in enhancing the taste of the food you cook. and kilometer (km) are units of length which are bigger than a metre. If the zero error of vernier callipers is +0.02 cm, what is the correct thickness of the pencil? It prevents the spindle from further movement. (i) L.C. You can use these solutions to prepare for your studies and ace in exams. = 3.3 + 0.06 = 3.36 cm, Pitch of a screw gauge = 0.5 mm No. Another way to prevent getting this page in the future is to use Privacy Pass. of oscillations. of division of circular head in line with the base line (p) = 45 Circular scale reading = (p) × L.C. of circular division coinciding with m.s.d. Two factors on which the time period of a simple pendulum depends are, Two factors on which the time period of a simple pendulum does not depend are. Thus the actual length of the rod is 1.2 cm plus the length ab (i.e., the length between the 1.2 cm mark on the main scale and 0 mark on vernier scale). The least count of a vernier calipers is : The least count of a vernier calipers is 0.01 cm, A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale.

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