Lesson 2: Measurement

Question 1

What is the primary focus of Physics?

A) The study of historical events
B) The study of human behavior
C) The principles governing matter and energy in the universe
D) The development of technology

Answer 1

C) The principles governing matter and energy in the universe

Question 2

Which of the following best defines ‘matter’?

A) Energy that causes movement
B) Anything that has mass and occupies space
C) A type of energy related to heat
D) A measurement of time

Answer 2

B) Anything that has mass and occupies space

Question 3

Which branch of Physics deals primarily with the motion of macroscopic objects?

A) Quantum Mechanics
B) Thermodynamics
C) Relativistic Mechanics
D) Newtonian Mechanics

Answer 3

D) Newtonian Mechanics

Question 4

What type of quantity is ‘speed’?

A) Base Quantity
B) Derived Quantity
C) Fundamental Quantity
D) Scalar Quantity

Answer 4

B) Derived Quantity

Question 5

What does ‘SI Units’ stand for?

A) Standard International Units
B) Scientific Internal Units
C) International System of Units
D) Standardized International Units

Answer 5

C) International System of Units

Question 6

Which of the following defines a meter?

A) The time it takes for light to travel one meter
B) The distance light travels in a vacuum during a specific time interval
C) The average distance between two parallel lines
D) The amount of time light takes to travel a kilometer

Answer 6

B) The distance light travels in a vacuum during a specific time interval

Question 7

What is the base quantity for measuring electric current?

A) Meter
B) Ampere
C) Kilogram
D) Second

Answer 7

B) Ampere

Question 8

Which of the following quantities is considered a base quantity?

A) Force
B) Speed
C) Temperature
D) Pressure

Answer 8

C) Temperature

Question 9

The duration of one second is defined based on the transition of radiation in which atom?

A) Oxygen-16
B) Carbon-12
C) Cesium-133
D) Hydrogen-1

Answer 9

C) Cesium-133

Question 10

Which of the following is NOT a branch of Classical Physics?

A) Thermodynamics
B) Electromagnetism
C) Quantum Mechanics
D) Newtonian Mechanics

Answer 10

C) Quantum Mechanics

Question 11

What does the term ‘energy’ refer to in physics?

A) The weight of an object
B) A property possessed by objects that can cause them to move
C) The time taken for an event to occur
D) The amount of matter in an object

Answer 11

B) A property possessed by objects that can cause them to move

Question 12

Which branch of Physics focuses on the motion of atoms and molecules?

A) Classical Mechanics
B) Thermodynamics
C) Electromagnetism
D) Quantum Mechanics

Answer 12

B) Thermodynamics

Question 13

What type of quantity is ‘force’?

A) Base Quantity
B) Derived Quantity
C) Fundamental Quantity
D) Scalar Quantity

Answer 13

B) Derived Quantity

Question 14

Which of the following is an example of a derived quantity?

A) Length
B) Time
C) Frequency
D) Mass

Answer 14

C) Frequency

Question 15

What defines a ‘unit’ in measurement?

A) A physical quantity that cannot be measured
B) A standard used to measure a quantity
C) The amount of matter in an object
D) A technique used for calculations

Answer 15

B) A standard used to measure a quantity

Question 16

In what system are the most widely used standard measurements defined?

A) Metric System
B) Imperial System
C) International System of Units (SI)
D) American Standard Units

Answer 16

C) International System of Units (SI)

Question 17

How is the ampere defined?

A) The force required to move an electric charge
B) The electric current that produces a specific force between conductors
C) The energy consumed by an electric device
D) The speed of electric charges

Answer 17

B) The electric current that produces a specific force between conductors

Question 18

What does the study of ‘quantum mechanics’ primarily involve?

A) Large-scale motion of objects
B) Motion of subatomic particles
C) Electrical currents in circuits
D) Thermodynamic processes

Answer 18

B) Motion of subatomic particles

Question 19

Which of the following concepts is NOT included in classical physics?

A) Kinematics
B) Electrodynamics
C) Quantum Electrodynamics
D) Fluid Mechanics

Answer 19

C) Quantum Electrodynamics

Question 20

What is a key characteristic of relativistic mechanics?

A) It deals with everyday speeds and sizes.
B) It focuses on very fast-moving or very massive objects.
C) It applies only to thermodynamic systems.
D) It ignores gravitational effects.

Answer 20

B) It focuses on very fast-moving or very massive objects.

Question 21

Which of the following is a fundamental physical quantity?

A) Speed
B) Pressure
C) Length
D) Work

Answer 21

C) Length

Question 22

What is the significance of defining the meter based on the speed of light?

A) It allows for consistent measurement across different conditions.
B) It relates to gravitational forces.
C) It is based on historical artifacts.
D) It simplifies calculations for engineers.

Answer 22

A) It allows for consistent measurement across different conditions.

Question 23

Which of the following statements about derived quantities is true?

A) They can be measured directly without calculations.
B) They are only based on one base quantity.
C) They are formed from combinations of base quantities.
D) They do not have units of measurement.

Answer 23

C) They are formed from combinations of base quantities.

Question 24

What area does thermodynamics NOT cover?

A) Motion of atoms and molecules
B) Heat transfer and energy transformations
C) The behavior of fluids at rest
D) The motion of celestial bodies

Answer 24

D) The motion of celestial bodies

Question 25

The study of motion in Quantum Mechanics primarily focuses on which of the following? A) Macroscopic objects B) The behavior of light waves C) Subatomic particles and their interactions D) Classical motion laws

Answer 25

C) Subatomic particles and their interactions

Question 26

What does accuracy refer to in measurements? A. The agreement of repeated measurements B. The exactness of a measurement C. How close a measurement is to the true value D. The difference between two measured values

Answer 26

C. How close a measurement is to the true value

Question 27

What is precision in measurements? A. How close a measurement is to the true value B. The agreement of repeated measurements C. The accuracy of the instrument D. The ability to avoid errors

Answer 27

B. The agreement of repeated measurements

Question 28

Which of the following is TRUE about precise measurements? A. Precise measurements are always accurate B. Precise measurements cannot be inaccurate C. Precise measurements are not necessarily accurate D. Precision is irrelevant if accuracy is achieved

Answer 28

C. Precise measurements are not necessarily accurate

Question 29

What is the ideal goal for measurement? A. To be accurate, but not precise B. To be both accurate and precise C. To be neither accurate nor precise D. To rely solely on systematic error

Answer 29

B. To be both accurate and precise

Question 30

What is error in the context of measurements? A. The fluctuation in results over time B. The difference between the measured value and the true value C. The level of agreement between repeated measurements D. The degree of accuracy of an instrument

Answer 30

B. The difference between the measured value and the true value

Question 31

What is the source of systematic error? A. Random fluctuation in readings B. Inability to read the instrument properly C. Faulty calibration of measuring instruments D. Human error in data recording

Answer 31

C. Faulty calibration of measuring instruments

Question 32

Which of the following describes random error? A. It results in measurements being consistently too high or too low B. It is associated with faulty instruments C. It occurs with no specific pattern and leads to imprecise results D. It can be completely eliminated with careful calibration

Answer 32

C. It occurs with no specific pattern and leads to imprecise results

Question 33

What is the key difference between systematic and random errors? A. Systematic errors cause random fluctuations in readings, while random errors do not B. Systematic errors are associated with the instrument, while random errors are unpredictable C. Random errors cause consistent inaccuracies, while systematic errors do not D. Random errors can always be avoided, while systematic errors cannot

Answer 33

B. Systematic error

Question 34

Which of the following is a source of random error? A. Faulty calibration of instruments B. Errors occurring in a specific pattern C. Inability to read a fluctuating instrument D. Consistent bias in the data

Answer 34

C. Inability to read a fluctuating instrument