Physics Unit 1 Quick Revision with Short Notes and MCQs
Q-1 Describe
the concept of measurement in physics.
Measurement
assigns a numerical value to a physical quantity, using a standardized unit as
a reference point.
Q-2 Which
three quantities form the basis of physics measurement?
Physics
consists of three basic fundamental pillars: length, mass, and time. All other physical quantities are constructed from these
basic units.
Q-3 The standard unit of length in the International System of
Units?
The
International System of Units (SI) declares the meter (m) as the standard unit
for measuring length.
Q-4 Which unit
represents mass in the SI system?
The
kilogram (kg) holds the title of the SI unit for mass.
Q-5 The
internationally accepted unit for measuring time?
The second (s) serves as the basis of time measurement in the SI
system.
Q-6 How do we
obtain physical quantities that are not fundamental?
Derived quantities are the original issue of combining
fundamental quantities through mathematical operations, expanding our
measurement capabilities.
Q-7 Provide an
example of a derived quantity and its calculation formula.
Speed, a classic example of a derived quantity, emerges from the union of distance and time through the formula: Speed = Distance / Time.
Q-8 How do
accuracy and precision differ in scientific measurements?
Accuracy
refers to how close our measurement is to the true value, while precision focuses on how consistently we can reproduce the same measurement.
Q-9 What
information do significant figures convey about a measured value?
Significant
figures are the valuable digits in a measurement that we know with confidence, along with one uncertain digit, revealing the true accuracy of our data.
Q-10 What is
the significance of utilizing consistent units in scientific research?
Utilizing
the correct units throughout scientific actions ensures consistency, enables accurate calculations, and facilitates meaningful comparisons between various experiments.
MCQs & A
Q-1. Which of these things isn't
a basic building block of physics?
1) Length
2)
Mass
3)
Force
4)
Time
Q-2. What do we use to measure length in science?
1) Meters
2)
Kilograms (kg)
3)
Seconds (s)
4)
Newtons (N)
Q-3. What do we use to measure mass in science?
1) Meters (m)
2)
Kilograms (kg)
3)
Seconds (s)
4)
Newtons (N)
Q-4. What do we use to measure time in science?
1) Meters (m)
2) Kilograms (kg)
3)
Seconds (s)
4) Newtons (N)
Q-5. What are quantities that are made by combining basic physics quantities with
math?
1) Quantities measured directly with instruments.
2) Quantities that can't be directly measured.
3) Quantities that don't depend on other quantities.
4) Quantities made from combining basic physics
quantities.
Q-6. What equation tells us how fast something is moving?
1) Speed = Distance / Time
2)
Speed = Acceleration * Time
3)
Speed = Force / Mass
4)
Speed = Work / Energy
Q-7. What's the difference between being accurate and being precise?
1) Precision is how consistent your measurements are,
while accuracy is how close your measurements are to the true value.
2)
Accuracy is how consistent your measurements are,
while precision is how close your measurements are to the true value.
3)
Accuracy and precision are the same thing.
4)
There's no difference between accuracy and
precision.
Q-8. What are significant figures?
1) The digits in a measurement that you know for sure,
plus one that you're not sure about.
2)
All the digits in a measurement.
3)
The digits in a measurement that you guess.
4)
The digits in a measurement that you rounded off.
Q-9. Why is it important to use the same units in science?
1) To make things look neat.
2)
To make sure your calculations are correct.
3)
To compare different experiments.
4) All of the above.
Q-10. What do we do measurements in physics for?
1) To give numbers to things we measure.
2)
To understand how things, relate to each other.
3)
To predict how things will behave.
4)
All of the above.
.png)
.png)
0 Comments