Important Astro Physics Interview Questions
Q – 1 What is Lunar eclipse?
Ans- If three bodies sun, earth and moon are situated in a straight line, at the time of the moon entering the shadow cone the moon will be totally obscured, thereby giving a total lunar eclipse.
If they are slightly out of line, only a part of moon enters the umbrral cone and a partial lunar eclipse occurs. This o curs at full moon when moon enters that shadow of the earth, as cast by the earth.
Q – 2 What is Solar eclipse?
Ans- At new moon, earth may pass through moon?s shadow so that parts of the sun will be obscured to the eyes on the earth.
Earth e being much bigger than moon, whole of it cannot pass through the umbra. But as the points on the earth will fall
within this umbra, a total solar eclipse occurs.
At places which pass through penumbra, a partial solar eclipse occurs. Eclipses do not occur regularly even though the earth comes between the moon and the sun at every full moon.
It is because of two reasons:-
(1) The moon?s obit is inclined to that of earth at an angle of about 50 .
(2) The earth?s orbit being elliptical, the distance of the earth from the sun is different at different positions of
the orbit, due to which the size of the shadow changes.
Q – 3 What is Astronomical telescope?
Ans- It consist of two convex lenses. These lenses are called object glass and eye piece respectively. A real, inverted
and diminished object is formally the object at its focus.
This image lies with the focus of the eye piece which acts as a magnifying galss, producing a virtual, erect, enlarged image of it. The first image this seen is magnified, but inverted with respect to the object.
Magnigying power = F/f
Where F is focal length of object glass, and f is focal
length of eye-piece.
Q – 4 Who discovered Proton?
Ans- In 1886 Eugen Goldstein discovered canal rays (also known as anode rays) and showed that they were positively charged
particles (ions) produced from gases. Menas,originally Goldstein postulated that there were some positively charged
particles… but he didn’t say that they were Protons!!
Following the discovery of the atomic nucleus by Ernest Rutherford in 1911. This was confirmed experimentally by
Henry Moseley in 1913 using X-ray spectra. In 1919 Rutherford proved that the hydrogen nucleus is present in other nuclei, a result usually described as the discovery of the proton.
Q – 5 What is chandrayan?
Ans- chandrayan is a satellite which is discover on the moon i.e.
it is for finding the live on the moon
Objectives of Chandrayan were:
1. To design, develop, launch and orbit a spacecraft around the Moon using an Indian-made launch vehicle.
2. To conduct scientific experiments using instruments on the spacecraft which would yield data: for the preparation of a three-dimensional atlas (with high spatial and altitude resolution of 5-10 m) of both the near and far side of the Moon, for chemical and mineralogical mapping of the entire lunar surface at high spatial resolution, mapping particularly the chemical elements magnesium, aluminium, silicon, calcium, iron, titanium, radon, uranium, and thorium, to increase the scientific knowledge to test the impact of a sub-satellite (Moon Impact Probe – MIP) on the surface on the Moon as a fore-runner to future soft-landing missions
Q – 6 Do alliens really exist?
Ans- SETI (Search for Extra-Terrestrial Intelligence) is branch of Astro Physics which searches for the same which you asked!
Search for Extra-Terrestrial Intelligence (SETI) is the collective name for a number of activities people undertake to search for intelligent extraterrestrial life. SETI projects use scientific methods to search for electromagnetic transmissions from civilizations on distant planets.
There is one more such name: NTI – Non-Terrestrial
Intelligence… means this intelligence doesn’t live on
Earth/Land… It may lie beneath the oceans!!
Q – 7 WHAT ARE THE FORCES WHICH KEEP A FLYING PLANE IN A EQUILIBRIUM?
Ans- for level flight lift is balanced by weight and thrust is balanced by drag, hence then whole system become stable w.r.t to force and for moments , inherently stable aircraft are designed in a way that the pitching moment is balanced by horizontal stabilizer , elevator may be deflected for trim at certain velocities where i’m not changing the moment curve slope , and for roll and yaw stability both aileron and rudder may be used as they are cross coupled.
Aids in roll and yaw stability may be provided by high wing, sweep back, dihedral wings etc
Q – 8 How many planets are found till now?
Ans- eight Pluto isn’t considered a planet any more.
Q – 9 Why we feel sky blue in color?
Ans- The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions.
It gets scattered all around the sky.
Whichever direction you look, some of this scattered blue light reaches you.
Since you see the blue light from everywhere overhead, the sky looks blue.
Q – 10 Explain Shape of the earth?
Ans- Shape and size of the earth. The shape of the earth is regarded as a sphere , but it is actually an oblate spheroid
like as egg being slightly flattered at the poles
Q – 11 What is Equatorial and polar diameter?
Ans- The equatorial diameter. The equatorial diameter of the earth is 7920 miles in length and polar diameter is about 27
miles shorter than the former.
Q – 12 What is The weight of the earth?
Ans- The earth and its weight. It is impossible to find out the weight of the earth by any type of balance. If we express it in tons, the number of zeros required to do so would occupy almost more than half of a volume of this book. Therefore, we will try to express it in a simpler way as follows.
Take an example of hollow ball of the same size as the earth consisting entirely of water (i.e. a solid ball of water).if we weigh this ball we find this 5 1/2times lighter than that of the weight of the earth. This is actually means that the relative 5 1/2 or 5.5.
Q – 13 Magnetic effect of the earth is?
Ans- Magnetic effect of the earth. The earth behaves as it has got a big magnet, running as mot a big magnet, running
almost from its north to south pole inside it (the earth). Its south pole lies towards the geographical north pole and
the north pole lies towards the geographical south pole.
As a matted of fact, there is no such magnet inside it, but our earth, as a whole, acts as a big magnet, we can prove this
fact with the help of the following experiments.
(1) one can magnetise iron ?rods by the earth. This is possible only when the earth behaves like magnet or it has got magnetic material (a big magnet) inside it.
(2)when we suspend a magnet. Freely, it always rests in a particular direction almost coinciding with the north and the south direction. It is only possible when we presume that there is magnet inside the earth of which north elope is towards soothe pole of
geography and south pole is towards geographical north pole.
Q – 14 Distance of the earth from the moon and the sun is?
Ans- the distance of the earth from the moon is 2,40,000 miles or 24 x 104 miles and that from the sun is 93,000,000or93x106miles.
The moon is more than one light second and the sun 8 light minutes away, i.e. light traveling at 1,86,000 miles per second takes just over a second to reach from the moon and about 8 minutes from the sun.
Q – 15 What is The sun?
Ans- The sun:- Sun the brightest object in the sky. It is body id the solar system. It has a luminous sphere approximately 8,65,000 miles in diameter. It is supposed that is consists of a liquid inner portion with a gaseous outer covering. All kinds of the life on the earth and on other members of the solar system depend directly or indirectly upon the radiation from the Sun
The average distance of the earth from the sun is about 93,000,000 miles. If we compare the great size pf the sun with the earth, to do so we have to represent the earth by the head of a pin struck in the teacher?s desk, the sun would be shown by a big ball at the other end of the class ?room. Spectral analysis shows that sun is compose id many elements such as found in the earth .
It s surface temperature is about 6,0000C. The volume of sun is 13,000,00 tines that of the earth and its mass is 3
,32,0000 times that of the earth.
Q – 16 What are The Stars?
Ans- The star is made up of dust and gas in space. Basically it has so many stages they are
1.black hole
2.nuetron star
3.supernova
4.red giant stage
our solar system consists a big star name sun which is attracting 8 other planets with it’s gravity.
It has an expected age of 10 billion years.
Q – 17 Explain The Moon?
Ans- The Moon:- It is the only natural satellite if the earth revolving round the earth. It s one revolution round the
earth tales approximately one lunar month(of 29 ? days).
This period varies by 13 hours sue the eccentricities of the orbits of the moon and earth. Unlike the sun and the stars, its shinning is seen due to the reflected light which comes from the sun.
The diameter if the moon is lesser than one quarter that of the earth. Compared with the sun the moon is quite near to the earth(only 240,000 miles away). The diameter of the moon on several calculations found to be 2160 miles.
Q – 18 Explain The planets?
Ans- The planets:- We know in the solar system that the sun is fixed and that moving round it are a number of large spheres known as planets . These are nine planets, viz., the Earth, Neptune, Pluto, Uranus, Saturn, Jupiter, Mars and Mercury
Q – 19 What is Eclipses?
Ans- Sun is a luminous body whereas earth and moon are non-luminous bodies. Only those parts of moon on which light of sun falls is visible. Also sun is larger than, both the each and the moon so that shadows of both are cast in space with a distinct umbra and penumbra. These shadows? are called eclipses.