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PHYSICAL SCIENCES
Post: #1

PHYSICAL SCIENCES


.pdf  Physics%20I%20Model.pdf (Size: 253.3 KB / Downloads: 88)
41. The resolution of a Michelson interferometer operating with a light source of 640 nm
wavelength is

1. 1280 nm.
2. 640 nm.
3. 80 nm.
4. 1 nm.

42. When a terminal is at virtual ground, then

1. both current and voltage are zero.
2. only voltage will be zero.
3. only current will be zero.
4. both voltage and current are not zero.

43. Platinum resistor (PTR) and a thermistor(THR) are used to measure room temperature.
Which of the following is true?

1. PTR offers more accuracy, THR more resolution.
2. PTR offers more resolution, THR more accuracy.
3. Both offer same accuracy, THR offers more resolution.
4. Both offer same resolution, PTR offers more accuracy.

44. A four bit A/D converter is used to convert an analog voltage of 8V. The maximum error is

1. 0.5 V.
2. 1.0 V.
3. 2.0 V.
4. 0.25 V.
Post: #2
Physical science is a branch of natural science that studies non-living or living systems, in contrast to the life sciences. In turn, it has many branches, each of which is called "physical science", collectively referred to as the "physical sciences". However, the term "physical" creates an unintentional, somewhat arbitrary distinction, since many branches of physical science also study biological phenomena and branches of chemistry such as organic chemistry.

Physical science can be described as all of the following:
• A branch of science (a systematic enterprise that constructs and organizes knowledge in the form of testable explanations and predictions about the universe).
• A branch of natural science - natural science is an important branch of science that attempts to explain and predict the phenomena of nature, based on empirical evidence. In the natural sciences, the hypotheses must be verified scientifically to be considered as scientific theory. Validity, precision, and social mechanisms that ensure quality control, such as peer review and the repeatability of findings, are among the criteria and methods used for this purpose. Natural science can be divided into two main branches: the life sciences, for example biology and physical science. Each of these branches, and all its sub-branches, are called natural sciences.
 

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