Sign up to our innovative Q&A platform to pose your queries, share your wisdom, and engage with a community of inquisitive minds.
Log in to our dynamic platform to ask insightful questions, provide valuable answers, and connect with a vibrant community of curious minds.
Forgot your password? No worries, we're here to help! Simply enter your email address, and we'll send you a link. Click the link, and you'll receive another email with a temporary password. Use that password to log in and set up your new one!
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Who was India’s first female astronaut?
India's first female astronaut was Kalpana Chawla, who, despite being born in India, was a U.S. citizen. She became the first woman of Indian origin in space as a NASA astronaut. Key Facts about Kalpana Chawla: Born: March 17, 1962, in Karnal, Haryana, India. NASA Career: Kalpana Chawla first flew iRead more
India’s first female astronaut was Kalpana Chawla, who, despite being born in India, was a U.S. citizen. She became the first woman of Indian origin in space as a NASA astronaut.
Key Facts about Kalpana Chawla:
Born: March 17, 1962, in Karnal, Haryana, India.
NASA Career: Kalpana Chawla first flew into space in 1997 aboard the Space Shuttle Columbia on mission STS-87. Her second mission was in 2003, again aboard Columbia on STS-107.
Tragic End: On February 1, 2003, during her second mission, the Space Shuttle Columbia disintegrated upon re-entry into Earth’s atmosphere, tragically ending the lives of all seven crew members.
Although Kalpana Chawla was an American citizen, her Indian heritage has made her an iconic figure in India. She remains a symbol of inspiration for people from India and around the world, particularly for women aspiring to excel in fields like science, technology, and space exploration.
See lessWhat is a comet?
A comet is a small celestial body that orbits the Sun, composed mainly of ice, dust, and rock. Comets are often referred to as "dirty snowballs" because of their icy composition mixed with other materials. They are most notable for their spectacular tails that form when they approach the Sun. Key FeRead more
A comet is a small celestial body that orbits the Sun, composed mainly of ice, dust, and rock. Comets are often referred to as “dirty snowballs” because of their icy composition mixed with other materials. They are most notable for their spectacular tails that form when they approach the Sun.
Key Features of Comets:
1. Nucleus: The solid, central part of a comet, made of a mixture of water ice, carbon dioxide, ammonia, methane, and dust. This is the core of the comet, typically a few kilometers in diameter.
2. Coma: As the comet nears the Sun, the heat causes the icy nucleus to sublimate, releasing gas and dust. This creates a glowing coma (a cloud of gas and dust) around the nucleus, which can be hundreds of thousands of kilometers in diameter.
3. Tail: A comet develops one or two tails that point away from the Sun. The dust tail is made of small particles that are pushed away from the Sun by solar radiation, while the ion tail is made of charged particles that are influenced by the solar wind. Both tails always face away from the Sun due to the influence of solar radiation and wind.
4. Orbit: Comets follow elongated orbits around the Sun, taking them from the outer regions of the solar system to the inner solar system. Some comets have long-period orbits, taking them hundreds or even thousands of years to complete one orbit, while others follow shorter paths.
Origin:
Comets are believed to originate from two main regions of the solar system:
Kuiper Belt: Located beyond the orbit of Neptune, this region contains many icy bodies and short-period comets (comets with orbits that take less than 200 years).
Oort Cloud: A distant, spherical cloud surrounding the solar system, containing long-period comets that can take thousands to millions of years to complete their orbits.
Importance:
Comets are thought to be remnants from the early solar system, and studying them can provide insight into the conditions that existed during its formation.
Their behavior and orbits have been studied for centuries, making them important in the field of astronomy.
Some famous comets include Halley’s Comet, which appears roughly once every 76 years, and Comet NEOWISE, which was visible in 2020.
See lessHow do we measure temperature scientifically?
Temperature is measured scientifically using thermometers or similar instruments based on well-established physical principles. These devices rely on the thermal properties of materials to quantify temperature accurately. Below are the most common methods and tools used for scientific temperature meRead more
Temperature is measured scientifically using thermometers or similar instruments based on well-established physical principles. These devices rely on the thermal properties of materials to quantify temperature accurately. Below are the most common methods and tools used for scientific temperature measurement:
1. Thermometers
a. Liquid-in-Glass Thermometers:
Contains mercury or alcohol that expands and contracts with temperature.
Used in meteorology and basic laboratory applications.
b. Digital Thermometers:
Use electronic sensors, such as thermistors or resistance temperature detectors (RTDs), to measure temperature.
Common for medical, industrial, and environmental measurements.
2. Resistance Temperature Detectors (RTDs)
Measure temperature by detecting changes in the electrical resistance of metals (usually platinum).
Accurate and widely used in laboratories and industries.
3. Thermocouples
Measure temperature based on the voltage generated at the junction of two dissimilar metals.
Effective for a wide temperature range, including extreme conditions like furnaces or cryogenics.
4. Infrared (IR) Thermometers
Measure thermal radiation emitted by objects to determine their temperature.
Non-contact method used in industries, healthcare (like fever detection), and astronomy.
5. Pyrometers
Specialized instruments used to measure extremely high temperatures, such as in molten metals or kilns.
Often based on thermal radiation principles.
6. Calorimetry
Used in scientific research to measure temperature changes during chemical reactions or phase transitions.
Relies on the heat transfer principle.
7. Advanced Techniques
a. Spectroscopy-Based Methods:
Used in astrophysics and plasma physics by analyzing light emitted by objects.
b. Cryogenic Sensors:
Specialized sensors like Cernox and silicon diodes for ultra-low temperatures.
Units of Measurement
Temperature is measured using standardized units:
Kelvin (K): SI unit, used in scientific research.
Celsius (°C): Used in daily life and most scientific contexts.
Fahrenheit (°F): Primarily used in the United States.
By employing these tools and methods, scientists can measure temperature with precision across a vast range of environments.
See lessWho is the author of the book Gora?
The author of the book "Gora" is Rabindranath Tagore, the renowned Indian poet, writer, and Nobel laureate. Written in Bengali and published in 1909, Gora is one of Tagore's most celebrated novels. About Gora: Themes: The novel addresses complex issues of identity, religion, nationalism, and socialRead more
The author of the book “Gora” is Rabindranath Tagore, the renowned Indian poet, writer, and Nobel laureate. Written in Bengali and published in 1909, Gora is one of Tagore’s most celebrated novels.
About Gora:
Themes: The novel addresses complex issues of identity, religion, nationalism, and social reform in colonial India.
Plot: It revolves around the protagonist, Gora (Gourmohan), and his journey of self-discovery, grappling with questions of caste, religion, and patriotism.
Significance: Gora is considered a masterpiece for its deep philosophical insights and portrayal of Indian society during the late 19th and early 20th centuries.
Rabindranath Tagore’s Gora remains a landmark in Indian literature, offering a nuanced critique of contemporary socio-political issues.
See lessWhich one of the following options is correct in respect …
Correct Answer: Statement-I is incorrect but Statement-II is correct Explanation: Statement-I: "The soil in tropical rain forests is rich in nutrients." Incorrect. The soil in tropical rainforests is typically poor in nutrients. This is because heavy rainfall causes leaching, washing away nutrientsRead more
Correct Answer: Statement-I is incorrect but Statement-II is correct
Explanation:
Incorrect.
The soil in tropical rainforests is typically poor in nutrients. This is because heavy rainfall causes leaching, washing away nutrients from the topsoil. Most of the nutrients in tropical rainforests are found in the biomass (plants and trees) rather than in the soil.
Correct.
Tropical rainforests experience warm and humid conditions, which accelerate the decomposition of organic matter. This rapid decomposition ensures that nutrients are quickly absorbed by plants, leaving little in the soil.
Conclusion:
The soil in tropical rainforests is nutrient-poor, despite the rapid decomposition of organic matter due to the high temperature and moisture.
See lessThus, Statement-I is incorrect, but Statement-II is correct.
With reference to the Earth's atmosphere, which one of the …
Correct Answer: Infrared waves are largely absorbed by water vapor that is concentrated in the lower atmosphere. Explanation: "The total amount of insolation received at the equator is roughly about 10 times that received at the poles." Incorrect. While there is a significant difference in insolatioRead more
Correct Answer: Infrared waves are largely absorbed by water vapor that is concentrated in the lower atmosphere.
Explanation:
- “The total amount of insolation received at the equator is roughly about 10 times that received at the poles.”
- “Infrared rays constitute roughly two-thirds of insolation.”
- “Infrared waves are largely absorbed by water vapor that is concentrated in the lower atmosphere.”
- “Infrared waves are a part of the visible spectrum of electromagnetic waves of solar radiation.”
See lessIncorrect.
While there is a significant difference in insolation between the equator and the poles due to the angle of incidence of solar radiation, it is not as extreme as 10 times. The actual difference is much smaller, generally ranging from 2 to 3 times.
Incorrect.
Infrared rays are part of the electromagnetic spectrum, but they only constitute a small portion of the incoming solar radiation (insolation). The majority of insolation consists of visible light and ultraviolet radiation.
Correct.
Infrared waves, which are long-wavelength radiation, are absorbed by greenhouse gases such as water vapor, carbon dioxide, and methane. Water vapor, concentrated in the lower atmosphere (troposphere), plays a major role in absorbing and trapping infrared radiation, contributing to the greenhouse effect.
Incorrect.
Infrared waves are not part of the visible spectrum. The visible spectrum includes wavelengths between 400-700 nanometers, whereas infrared waves are longer than this range and are not visible to the human eye.
How many of the given countries share a land border …
Analysis: Bulgaria: Does not share a land border with Ukraine. Bulgaria is located south of Romania and separated from Ukraine by Romania. Czech Republic: Does not share a land border with Ukraine. The Czech Republic is located west of Slovakia, which lies between it and Ukraine. Hungary: Shares a lRead more
Analysis:
Does not share a land border with Ukraine. Bulgaria is located south of Romania and separated from Ukraine by Romania.
Does not share a land border with Ukraine. The Czech Republic is located west of Slovakia, which lies between it and Ukraine.
Shares a land border with Ukraine. Hungary borders western Ukraine directly.
Does not share a land border with Ukraine. Latvia is located north of Belarus and does not touch Ukraine.
Does not share a land border with Ukraine. Lithuania is also north of Belarus and does not border Ukraine.
Shares a land border with Ukraine. Romania borders southern Ukraine, specifically the Odesa and Chernivtsi regions.
Source: Britannica
Conclusion:
The correct countries that share a land border with Ukraine from the list are:
Final Answer: Only two.
See lessHow many of the given statements regarding green hydrogen is/are …
Correct Answer: All three Explanation: It can be used directly as a fuel for internal combustion: Correct. Green hydrogen can be used as a fuel in internal combustion engines (ICEs) with modifications. Hydrogen combusts cleanly, emitting only water vapor as a byproduct, making it a potential alternaRead more
Correct Answer: All three
Explanation:
Correct. Green hydrogen can be used as a fuel in internal combustion engines (ICEs) with modifications. Hydrogen combusts cleanly, emitting only water vapor as a byproduct, making it a potential alternative to traditional fuels.
Correct. Green hydrogen can be blended with natural gas and used in existing gas pipelines to generate heat or power. This helps reduce carbon emissions and makes use of existing infrastructure.
Correct. Hydrogen fuel cells convert green hydrogen into electricity, which can power vehicles. This is already being implemented in hydrogen-powered vehicles, which emit only water vapor.
Thus, all three statements are correct.
See lessHow many of the given statements regarding mercury pollution is/are …
Correct Answer: All three Explanation: Gold mining activity is a source of mercury pollution in the world: Correct. Artisanal and small-scale gold mining (ASGM) is one of the largest global sources of mercury emissions. Mercury is used in the extraction process to amalgamate gold, releasing significRead more
Correct Answer: All three
Explanation:
Correct. Artisanal and small-scale gold mining (ASGM) is one of the largest global sources of mercury emissions. Mercury is used in the extraction process to amalgamate gold, releasing significant amounts of mercury into the environment.
Correct. Coal contains trace amounts of mercury. When coal is burned in thermal power plants, mercury is released into the atmosphere as a pollutant.
Correct. Mercury is highly toxic, and even low levels of exposure can lead to serious health effects. The World Health Organization (WHO) states that there is no safe threshold for mercury exposure, particularly for vulnerable groups such as pregnant women and children.
Hence, all three statements are correct.
See lessस्वस्थ रहने के लिए क्या आहार लें?
To stay healthy, a balanced diet is essential. A balanced diet includes the right proportion of nutrients required by the body. Here are key recommendations for a healthy diet: 1. Include a Variety of Foods Fruits and Vegetables: Consume at least 5 servings a day. Choose a variety of colors for diffRead more
To stay healthy, a balanced diet is essential. A balanced diet includes the right proportion of nutrients required by the body. Here are key recommendations for a healthy diet:
1. Include a Variety of Foods
2. Focus on Healthy Fats
3. Stay Hydrated
4. Limit Sugar and Salt
5. Dairy or Dairy Alternatives
6. Small and Frequent Meals
7. Avoid Processed Foods
8. Customize Based on Individual Needs
By following these guidelines, you can maintain overall health, energy levels, and immunity while reducing the risk of chronic diseases.
See less