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Test: Unit - SSC CGL MCQ


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15 Questions MCQ Test General Awareness for SSC CGL - Test: Unit

Test: Unit for SSC CGL 2024 is part of General Awareness for SSC CGL preparation. The Test: Unit questions and answers have been prepared according to the SSC CGL exam syllabus.The Test: Unit MCQs are made for SSC CGL 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Unit below.
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Test: Unit - Question 1

What defines a physical quantity in scientific terms?

Detailed Solution for Test: Unit - Question 1

In scientific terms, a physical quantity is defined as a property of a body, substance, or phenomenon that can be quantified through measurement. This means that physical quantities are attributes that can be observed and measured, such as length, mass, time, temperature, etc. Measurement plays a crucial role in quantifying these physical quantities accurately, aiding in various scientific studies and applications.

Test: Unit - Question 2

How is the absolute error in a measurement defined?

Detailed Solution for Test: Unit - Question 2

The absolute error in a measurement is defined as the difference between the true value and the measured value of a quantity. It represents the discrepancy between the value that was actually measured and the value that is considered to be true or accurate. Absolute error is crucial in assessing the precision and accuracy of measurements in various scientific experiments and applications.

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Test: Unit - Question 3

What does the relative error in measurement represent?

Detailed Solution for Test: Unit - Question 3

The relative error in measurement is defined as the ratio of the absolute error to the mean value of the quantity being measured. It provides a normalized indication of the error in relation to the average value of the quantity. Relative error is useful in understanding the precision of measurements, especially when comparing different measurements or experiments.

Test: Unit - Question 4

What are the main systems of units used to measure physical quantities ?

Detailed Solution for Test: Unit - Question 4

The main systems of units used to measure physical quantities are CGS (Centimetre, Gram, Second), FPS (Foot, Pound, Second), MKS (Metre, Kilogram, Second), and SI (International System of Units). The International System of Units (SI) is the most widely used system for scientific and technical purposes globally. It provides a coherent set of units for measurements in areas such as length, mass, time, electric current, temperature, and many other physical quantities.

Test: Unit - Question 5

Which system of units includes the measurement of length in meters, mass in kilograms, and time in seconds?

Detailed Solution for Test: Unit - Question 5

The MKS system stands for Metre, Kilogram, Second, where length is measured in meters, mass in kilograms, and time in seconds. This system is commonly used in scientific and engineering applications due to its simplicity and coherence, making it easier to work with various physical quantities in calculations and experiments.
the SI (International System of Units) also includes these units (meters, kilograms, seconds) and is the modern, widely accepted system used in most scientific and technical fields.

Test: Unit - Question 6

In which system of units is length measured in centimeters, mass in grams, and time in seconds?

Detailed Solution for Test: Unit - Question 6

The CGS system, which stands for Centimetre, Gram, Second, utilizes centimeters for length, grams for mass, and seconds for time. While not as commonly used in modern scientific contexts, the CGS system finds applications in specific fields like astronomy and particle physics due to its convenience for certain calculations and measurements.

Test: Unit - Question 7

What is the significance of the Radian (rad) in the SI system?

Detailed Solution for Test: Unit - Question 7

The Radian (rad) in the SI system is a unit of plane angle. This unit is crucial for measuring angles in a variety of fields such as mathematics, physics, and engineering. One radian is defined as the angle subtended at the center of a circle by an arc equal in length to the circle's radius. Understanding this unit is essential for calculations involving rotational motion, oscillations, and trigonometry.

Test: Unit - Question 8

Which fundamental quantity does the Steradian (sr) represent in the SI system?

Detailed Solution for Test: Unit - Question 8

The Steradian (sr) in the SI system is the unit of solid angle. This fundamental quantity is vital for measuring how a three-dimensional object appears from a particular point in space. Understanding the Steradian is crucial in fields such as optics, astronomy, and computer graphics where the measurement of angles in 3D space is essential for accurate calculations and simulations.

Test: Unit - Question 9

How many supplementary fundamental units are there in the SI system?

Detailed Solution for Test: Unit - Question 9

In the SI system, there are two supplementary fundamental units: the Radian (rad) for plane angle and the Steradian (sr) for solid angle. These units supplement the seven base fundamental quantities to provide a comprehensive framework for measuring various physical quantities accurately. Understanding these supplementary units is essential for precise calculations and measurements in fields that require angular considerations.

Test: Unit - Question 10

What is the SI unit of mass ?

Detailed Solution for Test: Unit - Question 10

The SI unit of mass, is the kilogram (kg). It is defined as the mass of 5.0188 × 1025 atoms of carbon-12. The kilogram is a fundamental unit in the International System of Units and is used as a standard for mass measurements worldwide.

Test: Unit - Question 11

Which unit of length is defined as the distance light travels in a vacuum in 1/299,792,458 of a second?

Detailed Solution for Test: Unit - Question 11

The unit of length defined as the distance light travels in a vacuum in 1/299,792,458 of a second is the metre (m). This unit is fundamental in the International System of Units (SI) and serves as the basis for measuring length in the metric system.

Test: Unit - Question 12

What is the unit of time defined as 1/86,400 of a mean solar day?

Detailed Solution for Test: Unit - Question 12

The SI unit of time, defined as 1/86,400 of a mean solar day, is the second. This standard unit of time is crucial in various fields such as physics, engineering, and everyday timekeeping. It provides a consistent measure for timing and synchronization across different contexts.

Test: Unit - Question 13

How is the percentage error calculated in measurement analysis?

Detailed Solution for Test: Unit - Question 13

The percentage error in measurement is calculated by multiplying the relative error by 100. This calculation helps express the error as a percentage of the measured value, providing a clear understanding of the magnitude of error relative to the size of the quantity being measured. Percentage error is valuable in assessing the accuracy of measurements and determining the reliability of experimental results.

Test: Unit - Question 14

Which system of units includes measurements in feet, pounds, and seconds?

Detailed Solution for Test: Unit - Question 14

The FPS system, which stands for Foot, Pound, Second, incorporates feet for length, pounds for mass, and seconds for time. This system was historically used in the United States and the United Kingdom but has largely been replaced by the more standardized International System of Units (SI) in scientific and technical fields worldwide.

Test: Unit - Question 15

What is the most widely accepted system for fundamental quantities, adopted in 1971?

Detailed Solution for Test: Unit - Question 15

The most widely accepted system for fundamental quantities, adopted in 1971, is the International System of Units (SI). This system provides a standardized framework for measuring physical quantities, ensuring consistency and accuracy in scientific and engineering applications worldwide. Adherence to the SI system is crucial for promoting international cooperation and understanding in the realm of measurement and scientific research.

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