D. Short answer questions.
1. What is mass? Give any three units of mass.
2. State whether the units are written correctly. If not, correct them.
a. 45 seconds b. 67 ms
C. 78 n
d.99 Kg
3. What is the parallax error?
4. Naine any two units used to measure temperature.
e. 66 Meters
E. Long answer questions.
1. Explain the precautions that should be taken while measuring length using a ruler
2. Explain the process of measuring using a ordinary measuring tape
3. Differentiate between a laboratory thermometer and a clinical thermometer
4. How would you calculate the area of a square sheet of paper using graph paper.
Answers
Answer:
1 : Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies. The basic SI unit of mass is the kilogram (kg).
Unit Abbreviation Mass (Weight)
kilogram kg 1000 grams
hectogram hg 100 grams
gram g 1 gram
2 : a . 45 second
b . 67 m/s or 67 m s ^-1
c . 78 N
d . 99 kg
e . 66 meter or 66 m
3 : Parallax(parallel axis), meaning 'alternation') is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances.
To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax.
4 : kelvin and celcius
E ; 1 : The following things should be kept in mind while measuring the length of any object:
The object to be measured should be kept properly on the scale such that one of its end coincides with the zero (0) mark on the scale.
The object to be measured should be kept parallel to the scale and touching it.
2 : How to Read a Tape Measure
Find/read the markings. On a standard tape measure, the biggest marking is the inch mark (which generally has the biggest number, if it has them).
As the increments decrease, so does the length of the mark. ...
Read 1 inch. ...
Read one-half inch. ...
The remaining markings follow a similar pattern.