Worksheet - Answer the following questions in a sentence or two: Define: a) Measurement b) Mass c) Length d) Volume e) Time 1 2. 3 What are SI units ?. What is Parallax error ? 4. 5. What is the correct position of the eye while reading a scale? What are the fundamental physical quantities? Write the derived units of length. When a stone is immersed in water, water level increases. Why? 8. What is water displacement method ? 9. Objects weigh six times lighter on the moon than on the earth. Why? 6. 7. 10. What are the uses of electronic balance ? 11. Name the instruments used to measure time. 12. Write the uses of the following: a) Graduated Cylinder b) Divider c) Scale d) Physical Balance wing questions in detail :
Answers
Answer:
Measurement is the quantification of attributes of an object or event, which can be used to compare with other objects or events.
Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied force.
Length can be defined as a measurement of the physical quantity of distance.
Volume is the quantity of three-dimensional space enclosed by a closed surface.
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future.
The International System of Units (abbreviated SI from system international, the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. All SI units can be expressed in terms of standard multiple or fractional quantities, as well as directly.
A parallax error is the perceived shift in an object's position as it is viewed from different angles.
While reading the scale, the eye must be placed vertically above the scale mark being read. If the eye is not vertically above the scale mark being read, then the reading becomes wrong.
derived unit of length is meter.
Density of stone is more than that of water. So it sink in water. When it go inside water it took up some space as it is a matter and matter occupies space. Taking up of space results in rising of water level.
Since the Moon is smaller than Earth, it has a weaker gravitational pull. In fact, the Moon only has 1/6 the gravity that Earth does. This means you weigh six times less on the Moon than you do on Earth.
An electronic balance is a device used to find accurate measurements of weight. It is used very commonly in laborites for weighing chemicals to ensure a precise measurement of those chemicals for use in various experiments. Electronic balances may also be used to weigh food and other grocery items from home.
An instrument used to measure time is called a clock. People used instruments such as sundials and hourglass to keep track of time.
A graduated cylinder, also known as measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured.
Divider, instrument for measuring, transferring, or marking off distances, consisting of two straight adjustable legs hinged together and ending in sharp points.
Scales are used to measure the weight of an item. To use a scale, the item which needs to be weighed is put on one side of the scale. Then, weight stones are put on the other side. Once the scale balances (that is the indicator between the two scales is in the middle), the correct weight is chosen.
A physical balance is simply a weight measuring instrument. It is used to measure the weight of any unknown object with the help of the other object with known weight.
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