Test 1 Ncert Flashcards
During a lunar eclipse, all or part of the Moon's face may appear reddish, often called “Blood Moon”, due to 1. Rayleigh scattering 2. Raman scattering Which of the above is/are correct?
Correct Answer : A
Answer Justification :
Justification: Statement 1: When the moon passes through the middle of Earth’s shadow, red light
from the fringes around Earth beam onto the surface of the moon, turning it red.
Sunlight is made of different colors of light with different intensity for each color, combined together. White light is made of all the colors in equal intensity.
Light passes a long distance through the atmosphere in this direction, and the gases in the atmosphere let the red light pass through.
It happens that our atmosphere scatters blue light more than red. This is called “Rayleigh’s scattering”. Therefore out of all the colors in the sunlight, blue light is the one that is scattered and reaches our eyes during the day.
During a lunar eclipse, the moon turns red. A lunar eclipse is when moon, earth and sun align in a straight line with the earth in between the sun and the moon (like so: O—o—.). When this happens, light from the sun first hits the earth.
Most of the light hits the earth in the middle, but some of the light passes through the earth’s atmosphere. Because the atmosphere scatters blue more than red, all the blue light is “filtered out” of the sunlight due to scattering. But red light that don’t scatter remain and reaches the moon after passing through the earth’s atmosphere. It is this red light that hits the moon and reflects back to our eyes, and cause the “Blood moon”.
Statement 2: When light encounters molecules in the air, the predominant mode of scattering is elastic scattering, called Rayleigh scattering. This scattering is responsible for the blue color of the sky; it increases with the fourth power of the frequency and is more effective at short wavelengths. It is also possible for the incident photons to interact with the molecules in such a way that energy is either gained or lost so that the scattered photons are shifted in frequency. Such inelastic scattering is called Raman scattering.
First three largest constellations
- Hydra
- Virgo
- Ursa Major
Saptarshi forms a part of what constellation
Ursa Major constellation
Is Ursa Major visible through out the year in both hemispheres ?
Statement 3: Ursa Major is visible throughout the year from most of the northern hemisphere, and appears circumpolar above the mid-northern latitudes. From southern temperate latitudes, the main asterism is invisible, but the southern parts of the constellation can still be viewed
Which of the following have been understood to be adaptations to guard a desert animal from the intense heat? 1. Long legs 2. Ability to burrow deep in the sand 3. Nocturnal functioning 4. Big ears Select the correct answer using the codes below. A. 1, 2, 3 and 4 B. 2 and 3 only C. 1, 2 and 3 only D. 1 and 4 only
Your Answer : C
Correct Answer : A
We don’t have this in NCERT but do understand this
Big ears serve a dual purpose: they are great for listening for bugs to eat that may be moving around underground, but they are also loaded with blood vessels, allowing the animals to dissipate excess body heat. For a fox, for instance, they are good radiators during hot days.
Which is stable age with only on e inter-glacial period leading to a largely
stable environment.
Paleo or me so lithic
Paleo lithic
And major change is seen in Mesolithic —> 12,000 to 10,000 BC
Is any indian on moon
No
The three Indians on moon are
Rakesh Sharma, Kalpana Chawla and Sunita Williams
Rakesh Sharma (USSR), other two by nasa
Chandrayaan 2 will be launched in
GSLV MK 3
Geo synchronous satellite launch vehicle
What are the languages derived from Sanskrit name some
Assamese Gujarati Hindi Kashmiri Sindhi
Is Assamese Indo European or Tibet Burman
Indo European and more over its from sanskrit
The Sino-Tibetan languages with the most native speakers are the varieties of Chinese (1.3 billion), Burmese (33 million), and the Tibetic languages (6 million).
Which black hole is chosen for picturing
The one at farthest Messier 87, not the one at the nearest because nearest one will be moving and cause disturbance
And also nearer one Sagittarius A* is centre of the milkway which is objected by many stars as our Milky Way is cony
By measuring the angle of the Pole Star from your place, you can know the
- Latitude of your place
- Longitude of your place
Latitude
This North-star has two advantages, known since ancient times.
First of all, it tells the direction of accurate North.
Secondly, it may in an easy way tell your geographical latitude
Your Geographical Latitude = Height of North Star above horizon.
What are islets
Islets are very small islands.
In the Caribbean and West Atlantic, islets are often called cays or keys. Rum Cay in the Bahamas and the Florida Keys off Florida are examples of islets.
What are the islets found near Florida
The Florida keys
Where are Bahamas
They are near the east side if the USA near then Caribbean Sea
WHERE ARE Aegean islands
They are part of Greece in Aegean Sea
How many countries do Greece touch
Turkey
Bulgaria
Macedonia
Albania
Where is Puerto Rico
Beside Dominican Republic
What islands are not part of continental shelf
Oceanic islands
Because The vast majority are volcanic in origin, such as Saint Helena in the South Atlantic Ocean.
The few oceanic islands that are not volcanic are tectonic in origin and arise where plate movements have lifted up the ocean floor above the surface. Examples are Saint Peter and Paul Rocks in the Atlantic Ocean and Macquarie Island in the Pacific.
Example of oceanic volcano islands
St. Helena In south Atlantic Ocean
Example of oceanic islands due to plate movements
Saint peter and Paul rocks in Atlantic Ocean
Macquarie island in Pacific Ocean
What are three kinds of islands
Continental islands
Oceanic islands
Barrier islands —> accumulations of sand deposited by sea currents on the continental shelves
Fluvial islands —> formed in river deltas or midstream within large rivers. While some are transitory and may disappear if the volume or speed of the current changes, others are stable and long-lived.
Where is udaipur
Rajasthan
Where is nagpur wrt to Bhopal
Right of Bhopal
