Figure shows four sets of measurements on boards A, B, C and D each of which represent a rifle target. Solution 3: Length, mass, time are the three fundamental quantities. B has a measuring range of 0 – 4 kg and gives the smallest reading of 0.1 kg. Also, subtract zero error with its proper sign, if any, from the observed length to find the true length of the object. Solution 3: Slope of a graph indentifies the proportional relationship between the quantities plotted. Solution 23: A screw are threaded to twist in, when turned with a screw driver while nails are smooth to slide in straight when pounded with hammer. Solution 4: SI unit of frequency is hertz (Hz). The relation between liter and metre3 1 metre3 = 1000 liter, Solution 27: Pitch of the screw = 0.5 mm Least count = 0.001 mm Number of divisions = pitch/least count = 0.5/0.001 = 500, Solution 29: Precautions to be taken while measuring volume of a solid lighter than water using displacement method. 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 57: For measuring the length of an object using a vernier calipers, these steps are followed: Solution 59: Following procedure is used to measure the diameter of a wire, Solution 60: In order to measure the length of an object using a metre rule, the metre rule must be placed with its marking close to the object, such that the zero marking on the scale coincides with one end of the object. 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. Solution 21: A beam balance works on the principle of moments. Record the main reading. SI unit of volume is cubic metre (m3), Solution 24: 1 m3 = 1000 litre 1 litre = 1/1000 m3 = 0.001 m3, Solution 26: SI unit of volume is cubic metre or metre3 (m3). The error due to this is known as backlash error. Some of the fundamental units are metre (length), kilogram (mass), second (time), Kelvin (temperature), ampere (current), etc. First of all we find the least count and zero error of the vernier calipers. Solution 47: No, we cannot measure the diameter of a wire by wrapping it around a pencil because it is not very accurate. It must be widely acceptable all over the world. Solution 2: The units which can neither be derived from one another, nor can they be further resolved into other units are known as fundamental units. PAGE NO: 44 Solution 1: Least count of an instrument refers to the smallest reading that can be accurately measured while using the instrument. Then the reading on the scale corresponding to the other end of the object will give the length of the object. Solution 14: Effective length of a simple pendulum is the distance of the point of oscillation (i.e. always possible, feasible and practicable because some time human factor is involve and inaccuracy. There are many way in which instruments can be classified. It is avoided by turning the screw always in the same direction. A hawker has two measuring scales, A and B. It is distance between two consecutive threads of the screw. (d) The nearer a shot is to the bullseye, the nearer is the measurement to the actual value. At this stage, the total mass of weights on the right pan gives the mass of the body. Solution 22: The space occupied by a body is known as its volume. Solution 20: The quantity of matter contained Mass of a body can be measured by using a beam balance. Solution 8: The ratchet is used in a screw gauge to hold the object under measurement gently between the studs. Solution 6: The time period, T and frequency of oscillation, f are related as, T = 1/f or f = 1/T. 1 Parsec = 2 x 105 A.U. Pitch of the screw = distance travelled by screw in n rotations/n rotations. Now the lever is turned towards right so that the beam rises and the power begins to swing to pointer swing on either side. SI unit of volume is cubic metre (m3), Solution 23: The space occupied by a body is known as its volume. Scale A is more suitable for measuring the red chillies because it is more sensitive and can detect small changes in the mass. Great tips, many thanks for sharing. 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 8: 3000g is the most accurate measurement because it has maximum number of significant figures = 4. False, because the accuracy is higher in case of screw gauge due to lower least count value of 0.01mm, False, because its least count is limited to 0.1 cm. And low least count means high accuracy. Note the division on the vernier scale that coincides with some division of the main scale. Solution 7: The SI unit of mass is Kilogram. Solution 50: Number of threads =20 Distance covered in 20 threads = 10 mm Pitch of the screw gauge = 10/20 =0.5 mm No of divisions on circular scale = 50 Least count = pitch/no of divisions = 0.01 mm, Solution 53: Mass of the metal = 540g Volume = 200cm3 Density = mass of metal/ volume = 540 /200 = 2.70 g/cm3, Solution 54: Mass of copper = 540 g Density of copper = 9 g/cm3 Volume of copper used in the alloy = mass of copper / density = 540/9 = 60 cm3 Mass of iron = 240 g Density of iron = 8 g/cm3 Volume of iron used in the alloy = mass of iron / density = 240/8 = 30 cm3 Total mass of the alloy = 540 + 240 = 780 g Total volume of the alloy = 60 + 30 = 90 Density of the alloy = mass of the alloy / density of the alloy = 780 / 90 = 8.67 g/cm3. 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. Never keep the wet or hot objects on the pan. Volmeter A has a smaller minimum scale division compared to voltmeter B. Voltmeter A can detect a smaller change in the voltage than voltmeter B. Pitch of the screw = distance traveled by screw in n rotations/n rotations. In the physical sciences, quality assurance, and engineering. The error due to this is known as backlash error. PAGE NO: 47 Solution 7: Light year is defined as the distance travelled by light in vacuum in one year. Solution 13: Order of magnitude of a physical quantity is defined as its magnitude in powers of ten when that physical quantity is expressed in powers of ten with one digit towards the left decimal. 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 23: SI units of time and mass are second (s) and kilogram (kg) respectively. is the activity of obtaining and comparing physical quantities of real-world objects and events. Amplitude is the magnitude of the maximum displacement of the bob from the mean position on either side when an oscillation takes place. Introduction to physics ... Mass Measuring Instruments Stopwatch. Accuracy of a measurement is how close the measurement made to the actual value. For the same variation of voltage, voltmeter A gives a bigger deflection than voltmeter B. Solution 11: Least count of a vernier caliper used in laboratory is 0.1mm = 0.01cm. Solution 27: A physical balance works on the principle of moments. Solution 8: Three units of length greater than a metre are. 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. Solution 19: Material used for making screw gauge is stainless steel to avoid expansion and contraction due to change in weather as stainless steel absorbs a little heat. We say that the measurement is accurate. Broadly instruments are classified into two categories. Solution 35: Measurement is needed for precise description of any phenomenon happening in the world. Turn the ratchet clockwise so as to hold the wire gently in between the studs. Therefore in order to get the correct reading, the zero error should always be subtracted from the observed reading. 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.