Example 4. I like this blog. in engineering applications measurement system are use which require need of indirect method for measurement purpose. a physical quantity. For an instrument provided with a scale the least count is the value of one division on its scale. The length of seconds pendulum, where g = 9.8ms-2, is nearly 1 m. Solution 3: A stopwatch is used to measure short intervals of time. There comes an error of parallax due to thickness of the metre rule. When there is negative zero error, then the instrument reads less than the actual reading. B has a measuring range of 0 – 4 kg and gives the smallest reading of 0.1 kg. The weights should not be carried with bare hands to avoid the change in weights due to moisture and dust particles from the surrounding. Solution 13: Least count of an instrument refers to the smallest reading that can be accurately measured while using the instrument. Calculate the least count and zero error of the screw gauge. Absolute instruments 2. Pitch of the screw = distance traveled by screw in n rotations/n rotations. Before starting, bring the plumb line just above the pointed projection by adjusting the leveling screws at the base. The error due to this is known as backlash error. Solution 2: The physical quantities like mass, length and time which do not depend on each other are known as fundamental […] We should use screw gauge instead as its least count is 0.01 mm as the thickness of the paper is in the range of 10-2 mm. Accuracy of a measurement is how close the measurement made to the actual value. According to the principle of moments, under equilibrium condition, the clockwise moment due to the body on one side of beam equals the anti clockwise moment due to standard weights on the other side of beam. Figure shows four sets of measurements on boards A, B, C and D each of which represent a rifle target. Solution 21: If the zero of the circular scale lies above the line of graduation then it is called negative zero error. This is vernier scale reading. Solution 5: A standard metreis equal to 1650763.73 wavelengths in vacuum, of the radiation from krypton isotope of mass 86. Solution 13: If time period of a pendulum becomes infinite, the pendulum will not oscillate at all as pendulum will take infinite time to complete one oscillation. 1 Parsec = 2 x 105 A.U. First of all we find the least count and zero error of the vernier calipers. Solution 11: Two units of length smaller than a metre are. Measuring the internal diameter of a tube or a cylinder. Solution 9: If the zero of the circular scale does not coincide with the zero of the main scale (pitch scale), this is known as zero error. PAGE NO: 28 Solution 1: When one complete rotation is given to the screw hand, it moves forward or backward by a distance is called pitch of the screw. Solution 30: Measurement of volume of an irregular solid soluble in water using a graduated cylinder. Solution 5: When one complete rotation is given to the screw hand, it moves forward or backward by a distance called pitch of the screw. It must be accurately defined and must not change with time, place and physical conditions such as pressure, humidity, etc. When there is negative zero error, then the instrument reads less than the actual reading. Solution 38: The maintenance of standard units is essential because any variation in these standards would lead to wrong measurements, misleading results and confusing generalizations. Pitch of the screw = distance travelled by screw in n rotations/n rotations. The measuring process is one in which the property of an object or system under consideration is compared to an accepted standard unit, a standard defined for particular property. Copyright (c) 2020 Electrical Study Notes All Right Reseved. Consider a target as in Figure. Frank ICSE Solutions for Class 9 Physics – Measurement PAGE NO: 15 Solution 1: Measurement is an act or the result of comparison of a quantity whose magnitude is unknown with a predefined standard. (d) The nearer a shot is to the bullseye, the nearer is the measurement to the actual value. Solution: Scale B is more suitable for measuring a whole chicken because the mass of the chicken is out of the range of measurement of scale A. Record the main scale reading. Solution 24: Screw has two types of motions: linear and circular motions. Whenever you are near the actual weight, you should carefully try the weights in the descending order. Very small or large size may cause inconvenience. It is avoided by turning the screw always in the same direction. The standards are preserved in such a way that they do not undergo any change with the change in temperature, pressure, humidity and other environmental changes. Solution 14: Effective length of a simple pendulum is the distance of the point of oscillation (i.e. Solution 5: One standard kilogram is equal to the mass of a cylinder of nearly same height and diameter and made up of platinum and iridium alloy. Solution 14: No, we cannot measure the thickness of a paper with vernier caliper as its least count is only 0.1mm. Solution 5: When a pendulum completes one oscillation in one second, then the frequency is one hertz. Explain your answer. Solution 12: Vernier caliper is an instrument used for measuring small lengths of solid objects where an ordinary scale cannot be applied. Measuring Instruments 9th class physics Chapter 1 Physical Quantities & Measurements online lecture. A, B, C and D show the scales of four different meters respectively. PAGE NO: 15 Solution 1: Measurement is an act or the result of comparison of a quantity whose magnitude is unknown with a predefined standard. In the physical sciences, quality assurance, and engineering. A lady wants to buy a whole chicken of about 1.5 kg and red chillies of about 200 g. State which scale is suitable for each of the items and explain your answer. Solution 34: Wall clock with a pendulum will run at a faster rate in winter as it pendulum rod get shorter and the pendulum will swing at a faster rate thus the clock would run faster in winters. 1. For an instrument provided with a scale the least count is the value of one division on its scale. Solution 3: Slope of a graph indentifies the proportional relationship between the quantities plotted. Solution 11: Least count of a vernier caliper used in laboratory is 0.1mm = 0.01cm. Solution 11: Due to constant use, there is space for the play of screw gauge but gradually this space increases with the use or wear and tear, so that when the screw is moved by rotating it in some direction, it slips in the nut and does not cover any linear distance for some rotation of the screw head. There are two types of zero error –, Solution 10: Two scales in a screw gauge are. Solution 4: A standard metre is equal to 1650763.31 wavelengths in vacuum, of the radiation from krypton isotope of mass 86. Voltmeter A is more sensitive than voltmeter B because: Filed Under: Physics Tagged With: Consistency and Accuracy, Measurements, Measuring Instruments, Sensitivity, Sensitivity of Measuring Instruments, Understanding Measurements, ICSE Previous Year Question Papers Class 10, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, Death of a Salesman Essay | Essay on Death of a Salesman for Students and Children in English, Homelessness Essay | Essay on Homelessness for Students and Children in English, Food Essay | Essay on Food for Students and Children in English, Pro Life Essay | Essay on Pro Life for Students and Children in English, Diabetes Essay | Essay on Diabetes for Students and Children in English, Discrimination Essay | Essay on Discrimination for Students and Children in English, World War 2 Essay | Essay on World War 2 for Students and Children in English, Plus Two Computerised Accounting Chapter Wise Questions and Answers Chapter 6 Data Base Management System for Accounting, Plus Two Computerised Accounting Chapter Wise Questions and Answers Chapter 5 Accounting Software Package – GNUKhata, Plus Two Computerised Accounting Chapter Wise Questions and Answers Chapter 4 Graphs and Charts for Business Data, Plus Two Computerised Accounting Chapter Wise Questions and Answers Chapter 3 Use of Spread Sheet in Business Application, Physics is based on measurements. Solution 9: A seconds pendulum is a pendulum which takes 2 seconds to complete one oscillation. screw gauge. Solution 6: Initial level of water in cylinder = 30 ml Level of water in cylinder after immersing piece of copper = 50 ml Volume of copper piece = 50-30 = 20 ml. Solution 3: Length, mass, time are the three fundamental quantities. Courses List. Solution 12: Leap year because it is a unit of time.
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