Introduction To Physics And Measurement - SS1 Physics Past Questions and Answers - page 4
The digit "0" is significant if:
It is at the beginning of a decimal number.
It is between two nonzero digits.
It is at the end of a number with a decimal point.
It is a placeholder before a nonzero digit.
The speed of light in a vacuum is approximately 299,792,458 meters per second. Expressed with the correct number of significant figures, it would be:
300,000,000 meters per second.
299,800,000 meters per second.
299,792,000 meters per second.
299,792,500 meters per second.
Define Accuracy.
Accuracy refers to how close a measured value is to the true or accepted value. It indicates the absence of systematic errors in the measurement. A measurement is considered accurate if it is close to the true value, regardless of the precision of the measurement.
Define Precision.
Precision refers to the degree of consistency in a set of measurements. It reflects the ability to obtain the same or similar results repeatedly. A measurement is considered precise if repeated measurements yield similar results, even if they are not close to the true value.
5,674,890m in standard form would be
5.67489 X 10^6m
567,890,000cm
5.67489 X 10^5m
5.7 X 10^6m
0.004789s in standard form would be?
47 X 10^3s
4 X 10^4s
4.789 X 10^(-3)s
4.8 X 10^(-5)s
5,500m in centimetre would be
55,000cm
550,000cm
55cm
5.5cm
Converting 34°C to Kelvin would equal?
241K
5.78K
307.15K
9,282K
How many seconds are in a two-day period?
2,880s
288,000s
188,700s
172,800s
What is Scientific Notation?
Scientific notation (also known as standard form) is a way to express numbers in a concise and convenient form, especially when dealing with very large or very small numbers. It is expressed as a number between 1 and 10 multiplied by a power of 10.