13 Nov measurement and measuring instruments class 9
For the same variation of voltage, voltmeter A gives a bigger deflection than voltmeter B. False, the ratchet is used to hold the object under measurement gently between the studs. the centre of the gravity of bob) from the point of suspension. Scale A is more suitable for measuring the red chillies because it is more sensitive and can detect small changes in the mass. Electronic Instruments and Measurements, It is a very informative and useful post thanks it is good material to read this post increases my knowledge. The sinker should have a high density than water. 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. Place the object whose length is to be measured below the lower jaws and move the jaw till it touches the object. A circular scale divided into 50 or 100 equal parts. Solution 8: 1 Parsec is bigger because 1 Parsec is 3.26 times a light year. There are two types of zero error –, Solution 10: Two scales in a screw gauge are. Solution 39: Main characteristics of a standard unit are as follows. We can measure the length accurately up to the order of 10-2 cm, 10-3 cm depending upon the vernier used. For example, if a body is freely falling down to the ground, to understand this phenomenon we must know its velocity, time it will take to reach the ground , etc and to get answer to all our questions we need measurement. If the zero of the circular scale remains below the line of graduation then it is called positive zero error, If the zero of the circular scale lies above the line of graduation then it is called negative zero error, A linear scale called the main scale graduated in half millimeters. 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. Note the reading carefully and let the value be V. The beam must be gently lowered before adding or removing weights from the pan. The other measurement may be due to a wrong reading. At this stage, the total mass of weights on the right pan gives the mass of the body. Solution 4: Unit is a standard quantity of the same kind with which a physical quantity is compared for measuring it. 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. PAGE NO: 44 Solution 1: Least count of an instrument refers to the smallest reading that can be accurately measured while using the instrument. Solution 7: Two types of error in a measurement are. 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. Figure shows four sets of measurements on boards A, B, C and D each of which represent a rifle target. Solution 32: The time period, T and frequency of oscillation, f are related as, T = 1/ for f = 1/T. Solution 3: Length, mass, time are the three fundamental quantities. 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. Absolute instruments: these instruments are give magnitude of measuring quantities in term of physical constant of instrument. Now record the division of circular scale that coincides with the base line of main scale. Solution 22: The space occupied by a body is known as its volume. Solution 21: If the zero of the circular scale lies above the line of graduation then it is called negative zero error. 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. It is avoided by turning the screw always in the same direction. Never keep the wet or hot objects on the pan. Explain your answer. The length of seconds pendulum, where g = 9.8ms-2, is nearly 1 m. Solution 12: When a pendulum is taken from earth to moon surface, its time period will increase because the acceleration due to gravity on moon is less than that on earth and the time period depends inversely on square root of acceleration due to gravity.
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