Measurement is the process of comparing a given physical quantity with a … Unit 5 Exercise 5. Question 9. If observed diameter is 0.557 cm, then : (b) Is it possible to increase the degree of accuracy by mathematical manipulations? The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. Corrected diameter ∴ Correction Give three examples. In any experiment, all observations should be taken with same degree of accuracy. (a) What do you understand by the term graph? metre (m) has been used. Answer: ... ICSE Solutions for Class 9 Science ... Post a Question. The questions involved in Selina Solutions are important questions Vernier scale division (V.S.D.) (a) pitch of screw So it is expressed as 1.39 × 109 m. With its help, experimenter can easily understand nature of proportional relations between two variable quantities. Find the height of the tower. Who invented vernier callipers? It can be reproduced anywhere at any time because Krypton is available every where. If actual velocity of sound is 332 ms-1, calculate the percentage error. (i) What is the diameter of the wire in cm? It is not necessary that graph line should pass through all the points. Slope of graph. Amplitude = AB or AC. = – 5 × 0.001 cm = -0.005 cm The main scale of vernier callipers has 10 divisions in a centimetre and 10 vernier scale divisions coincide with 9 main scale divisions. (b) A best fit line shows that two variable quantities are directly proportional to each other. Mean of... Data What do you understand by (a) amplitude and (b) frequency of oscillations of simple pendulum? Answer: Question 10. It is denoted by ‘a’. (a) Factors on which time period of a simple pendulum depends : Question 9. There also exists natural experimental studies. Answer: Waste Generation and Management ... Post a Question. Exercise 1(A) Solution 1S. (a) mass of bob Select the correct option: 1. (b) When does a vernier callipers has, Answer: Name the part of the vernier callipers which is used to measure the following. Aligned with 2021 board exam pattern. Level of water in measuring cylinder = V1 = 12.5 ml Select Subject Maths EVS Biology Chemistry Physics. Answer: (a) External Jaws of a vernier callipers are used to measure the external diameter of cylinder. Can he write it as 2.60 cm ? Question 3. (a) Degree of accuracy : It means that we can measure a quantity, without any error of estimation. Ans. (a) Time period (T) : “is the time taken to complete one oscillation.” Its unit is second (s) and time period is denoted by ‘T” Two persons are standing on the opposite sides of a tower. Concepts covered in Concise Physics Class 9 ICSE chapter 1 Measurements and Experimentation are International System of Units, Other Commonly Used System of Units - fps and cgs, Measurements Using Common Instruments, Vernier Callipers and Micro-metre Screw Gauge for Length, Simple Pendulum for Time, Concept of Measurements and Experimentation. Answer: Answer: Selina Concise Physics Class 9 ICSE Solutions Measurements and Experimentation Exercise 1(A) Solution 1S. Characteristics of standard unit : Question 5. This will clear students doubts about any question and improve application skills while preparing for board exams. One cubic metre : Is the volume occupied by a cube whose each side is equal to 1 m. Question 2. He measures it to be 1.4 mm. × V.S.D. It is not necessary that graph line should pass through all points. Using Selina Class 9 solutions Measurements and Experimentation exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. (a) What is a second’s pendulum? = 2.95 + (-0.07) = 2.95 – 0.07 = 2.88 cm 'The distance of a star from the earth is 8.33 light minutes.' (c) Negative zero error : If the zero of the circular scale is above the reference line of the main scale, then screw gauge is said to have negative zero error and correction is positive. Question 1. How is the time period of the pendulum affected, if at all? To subscribe more you need to become a premium member. system, mass is measured in gram. For what range of measurement is micrometre screw gauge used? The pitch of a screw gauge is 1 mm and the circular scale has 100 divisions.

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