(i) Distance travelled d = speed v × time t. (b) A metallic piece displaces water of volume 15 ml. A piece of brass of volume 30 cm3 has a mass of 252 g. Find the density of brass in (i) g cm-3, (ii) kg m-3. This means that unit volume of brass contain 8.4 g mass. MCQs with answers are also given in Chapter 1 Physical Quantities and Measurements notes. Find the volume of the ball. A car travels a distance of 15 km in 20 minute. Answer: Speed of boy = 10 m s-1 Time taken = 30 minutes speed = distance travelled / time taken Distance travelled = Speed × Time taken Convert 30 minutes to seconds 1 minute = 60 sec 30 minute 60 × 30 = 1800 seconds Putting the value of speed and time we get Distance travelled = 10 ms-1 × (1800 sec) = 18000 m = 18000 metre or 18 km Ans. Car travels faster than scooter. Question 6. Question 3. (b) Volume: The formula of volume is: Volume = Length x width x height. unit of volume – The S.I. Take a piece of brass, a measuring cylinder, fine thread of sufficient length and some water. Answer: To measure the volume of a piece of stone. Express 36 km h-1 in m s-1 Answer: Question 18. Name two devices which are used to measure the volume of an object. Question 6. Answer. Physics Notes for Class 9th Chapter 1. Answer: From figure, the number of complete squares = 11 The number of squares more than half = 9 ∴ Total number of squares = 11 + 9 = 20 ∴ Area of the 1 square = 1 cm × 1cm = 1 cm2 ∴ Area of 20 squares = 20 × 1 cm2 = 20 cm2 ∴ Approximate area of irregular lamina = 20 cm2. Register at ilmkidunya and get full access to all features of this amazing study resource. In the smart syllabus of Physics, the following chapters and topics of 9th class are included: Chapter 1: Physical Quantities and Measurement. Definitions of three fundamental quantities: S.I. (g) 1 g cm-3 = 1000 kg m-3. Discuss with students the convenience and advantages of using prefixes and standard scientific expressions. Answer: Question 10. (a) The S.I. Quantities that cannot be defined in term of other physical quantities Quantities derived from combination of base quantities through multiplication or division or … Find the mass of cork. unit of density is Kg m-3. Question 1. Chapter: 1st Chapter of 9th Class Physics. Answer: Question 13. Question 2. (f) 1 g cm-3 = 1000 kg m-3. system is kilogram (kg). Answer: Question 9. How will you determine the volume of a cuboid ? (c) Volume of a cube = (one side) (d) The area of an irregular lamina is measured by using a grapl paper. 20 physical quantities with their si units and cgs units physical quantities and measurement notes base quantities base quantities definition Physical Quantities 9th class physics Chapter 1 Physical Quantities & Measurements online lecture False. For the same mass, the volume of: (g) A block of wood of density 0.8 g cm-3 has a volume of 60 cm3. Find the approximate area of an irregular lamina of which boundary line is drawn on the graph paper shown in fig. Answer: The distance covered or travelled by a body in one second is called the speed of the body, i.e. Therefore S.I. The weight of a body is the force with which every body is attracted towards its centre. The mass of an iron ball is 312 g. The density of iron is 7.8 g cm-3. To write 45000000 m as 45 Mm, or 4.5 x 107 m, and 0.000 000 0056 mas 5.6 nm, or The area of lamina is equal to the sum of the area of complete squares and the area of squares more than half. A vibrant community of 400,000 followers. Take out the measuring beaker from the bucket gently so that no milk splashes out and then pour the milk from the measuring beaker into the another empty vessel. A cork has a volume 25 cm3. Question 14. Physics Class 9 Chapter 1 - Quantities and Measurement What is the knowledge called that is gained through observations and experimentations? unit of density is g/cm3 or g cm-3. This post is about Physics Notes for Class 9 and 9th Class Physics Chapter 1 Short Questions with Answers. Answer: By using the measuring beaker A measuring beaker is used to measure a fixed volume of liquid from a large volume. Answer: A smaller unit of volume is cubic centimetre (symbol cm3) and cubic decimetre (symbol 1 dm3). For more content related to this post you can click on labels link. The first chapter of 9th Class Physics is “Physical Quantities and Measurement”. True. Question 11. So the units of velocity is ms-1 . (g) The density of water is maximum at 4°C. 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Answer. Answer: S.I. How much distance does he travel ? 1.16. below. When you can measure what you are speaking about and express it in numbers, you know something about it. The volume of piece is : (c) A piece of paper of dimensions 1.5 m x 20 cm has area : (e) The density of alcohol is 0.8 g cm-3. Answer: Question 11. Length and time are base quantities. We see that the level of water rises. Title: Physical Quantities & Measurement. State two smaller units of volume.
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