One atmosphere is equal to ________. | General Science MCQ | Examoogle

Back to Practice Questions

General SciencePrevious Year Paper 2024

Prev Next

One atmosphere is equal to ________.

$1.01 \times 10^5 \text{ Pa}$

$1.01 \times 10^6 \text{ Pa}$

$1.01 \times 10^{-5} \text{ Pa}$

$1.01 \times 10^{-6} \text{ Pa}$

Correct Answer

🔬 SC • Science Concept & PrincipleGeneral SciencePrevious Year Paper 2024

Option A

$1.01 \times 10^5 \text{ Pa}$

Quick Summary:

One standard atmosphere (atm) is a unit of pressure defined as the pressure exerted by the Earth's atmosphere at sea level. Its internationally accepted value in SI units is approximately $1.01325 \times 10^5 \text{ Pa}$ .

🎯

Crack Previous Year Paper 2024 with Examoogle SuperTeachers

Get Free Demo Classes & Live Mocks →

🔬SCScience SolutionConcept & Principle

💡 Explanation

💡 Everyday Analogy (Real-World Intuition)

Think of atmospheric pressure as the 'weight' of the entire column of air above you; at sea level, this column is the longest and heaviest, hence it exerts the standard pressure of $1 \text{ atm}$ .

🔢 Key Formulas

$1 \text{ atm} = 1.01325 \times 10^5 \text{ Pa}$ — Standard definition in SI units

$P = \frac{F}{A}$ — Definition of pressure as force over area

⚙️ Working Principle

Pressure is defined as the force applied perpendicular to the surface of an object per unit area. Since $1 \text{ atm}$ is defined as the pressure exerted by a mercury column of $760 \text{ mm}$ height, using the formula $P = \rho gh$ (where $\rho$ is the density of mercury, $g$ is acceleration due to gravity, and $h$ is height), we derive the standard atmospheric pressure in Pascals.

📌 Key Points

▸
The Pascal (Pa) is the SI derived unit of pressure, equivalent to $1 \text{ N/m}^2$ .
▸
Standard atmospheric pressure is also represented as $101.325 \text{ kPa}$ or $1.01325 \text{ bar}$ .
▸
Atmospheric pressure decreases with increasing altitude.

✅ Advantages

▸
Provides a universal reference point for scientific experiments involving gases and fluids.

❌ Disadvantages / Limitations

▸
Standard pressure is an approximation as actual atmospheric pressure varies with weather and altitude.

🛠️ Applications / Uses

▸
Calibration of barometers and pressure gauges.
▸
Standardizing thermodynamic conditions (STP) for chemical calculations.

📄 Additional Information

▸
Option A ( $1.01 \times 10^5 \text{ Pa}$ ) is the commonly accepted rounded scientific value for $1 \text{ atm}$ .
▸
Other options differ by orders of magnitude (e.g., $10^6 \text{ Pa}$ is $10 \text{ atm}$ , while $10^{-5} \text{ Pa}$ is near vacuum).

📊 Diagram / Illustration

✅

A is correct — The standard value of one atmosphere of pressure is approximately $1.01 \times 10^5 \text{ Pa}$ .

Core Concepts Used

Click any tag to open in AI Tutor

Atmospheric Pressure SI Units Standard Temperature and Pressure (STP)

💡 EXAM TIP

Remember that $1 \text{ bar} = 10^5 \text{ Pa}$ exactly, which makes $1 \text{ atm} \approx 1.013 \text{ bar}$ . Understanding these powers of 10 is crucial for unit conversion questions in physics exams.

Was this solution helpful?

⚡ Practice on Android App · 4.8 ★

Solve 10,000+ More Questions with AI Tutor

Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.

Free Download • 100K+ Aspirants

Discussion (0)

Loading discussion...

Prev Next

Correct Answer

Solve 10,000+ More Questions with AI Tutor

Related Questions

Discussion (0)

Correct Answer

Solve 10,000+ More Questions with AI Tutor

Related Questions

Discussion (0)