Science General · Geography

Astronomy and Celestial Phenomena

1,884 Questions

This section provides practice questions on astronomy and celestial phenomena, focusing on eclipses, planetary movements, and tides. These concepts are commonly tested in general science sections of various competitive exams. Use this hub to practice questions related to the Earth, Moon, and solar system dynamics.

Solar and lunar eclipsesEquinoxes and solsticesPlanetary movementsOcean tidesCoriolis effectMeteor showers

Astronomy and Celestial Phenomena Questions

Multiple choice

the Moon making a shadow on Earth

  1. phase

  2. axis

  3. solar eclipse

  4. lunar eclipse
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A solar eclipse occurs when the Moon passes between the Sun and the Earth, blocking the Sun's light and casting a shadow on Earth. This is distinct from a lunar eclipse.

Multiple choice

an apparent change in the moon's shape.

  1. phase

  2. crater

  3. axis

  4. revolution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Moon phases are the different appearances of the moon as seen from Earth, caused by the changing relative positions of the Earth, Moon, and Sun.

Multiple choice

What happens during a lunar eclips?

  1. Venus covers moon

  2. Moon is in Earth’s shadow

  3. Sun covers moon

  4. Moon covers sun
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A lunar eclipse occurs when the Moon passes through Earth's shadow. During this event, the Moon appears reddish due to Earth's atmosphere refracting sunlight.

Multiple choice

What happened during a solar eclipse?

  1. The moon covers the Sun on ground view

  2. Sun covers the moon on ground view

  3. Mars covers the moon on earth view
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A solar eclipse occurs when the Moon passes directly between the Sun and Earth, blocking the Sun's light and casting a shadow on Earth's surface.

Multiple choice

What is the order of the solar eclips?

  1. MEM

  2. SEM

  3. SME

  4. SED
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The order of planets from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. This corresponds to SME (Sun, Mercury, Earth) when referring to the inner three planets.

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

A large object is placed at exactly $65$% of the distance to the moon from the earth. Find out correct statement about the object ?

  1. Fall to the sun

  2. Fall to the moon

  3. Fall to the earth

  4. Remain in the same place

  5. Drift out of the solar system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The mass of moon is $1.2$% of that of earth. Hence $M _{moon}=0.012M _{earth}$

The acceleration due to gravity of the earth=$\dfrac{GM _{earth}}{(0.65R)^2}$
The acceleration due to gravity of the moon=$\dfrac{GM _{moon}}{(0.35R)^2}$
Hence $g _{earth}>g _{moon}$, and thus object falls towards the earth.

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

Both earth and moon are subject to the gravitational force to the sun. As observed from the sun, the orbit of the moon 

  1. will be elliptical.

  2. will not be strictly elliptical because the total gravitational force on it is not central.

  3. is not elliptical but will necessarily be closed curve.

  4. deviates considerably from being elliptical due to influence of plants other than earth.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the moon were to experience only the gravitation of the earth only then the path would have been elliptical but in the present case moon experience the gravitational force of sun as well which distorts the path.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Why does radio reception improve slightly during the night ? 

  1. The outside noise is reduced very much at night.

  2. Unlike the daytime, only a few radio stations broadcast during the night.

  3. Sunlight affects radio broadcasts to some extent during the day.

  4. The magnetic field of the earth acts with reduced intensity during the night, thereby reducing its impact on broadcasts.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

The D region is the lowest of the regions within the ionosphere that affects radio communications signals to any degree. It is present at altitudes between about 60 and 90 kilometers and the radiation within it is only present during the day to an extent that affects radio waves noticeably. It is sustained by the radiation from the Sun and levels of ionization fall rapidly at dusk when the source of radiation is removed. It mainly has the affect of absorbing or attenuating radio communications signals particularly in the LF and MF portions of the radio spectrum, its affect reducing with frequency. At night it has little effect on most radio communications signals although there is still a sufficient level of ionization for it to refract VLF signals.
Hence, radio reception improve slightly during the night because, sunlight affects radio broadcasts to some extent during the day.

Multiple choice

What are the effects of stellar flares and CMEs on Earth?

  1. They can disrupt radio communications

  2. They can cause power outages

  3. They can damage satellites

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stellar flares and CMEs can have a variety of effects on Earth, including disrupting radio communications, causing power outages, and damaging satellites. These effects are caused by the high-energy particles and radiation emitted by stellar flares and CMEs, which can interfere with electronic systems and damage infrastructure.

Multiple choice

Which astronomical phenomenon inspired the ancient Greeks to create the constellation of Orion, the Hunter?

  1. A supernova explosion

  2. A meteor shower

  3. A solar eclipse

  4. A lunar eclipse
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The constellation of Orion is believed to have originated from a spectacular meteor shower observed by the ancient Greeks, which they interpreted as a sign from the gods.

Multiple choice

The Great Comet of 1811, also known as Comet Hale-Bopp, was visible for how many months?

  1. 3

  2. 6

  3. 9

  4. 12
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Comet Hale-Bopp was visible to the naked eye for an unprecedented 18 months, making it one of the most widely observed comets in history.

Multiple choice

Which astronomical event marked the beginning of the Common Era, or Anno Domini (AD), as we know it today?

  1. The Winter Solstice

  2. The Summer Solstice

  3. The Vernal Equinox

  4. The Autumnal Equinox
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Common Era, or AD, begins with the vernal equinox, which occurs around March 21st and marks the start of spring in the Northern Hemisphere.

Multiple choice

The precise observation of the transit of Venus across the Sun in the 18th century contributed to the accurate measurement of which astronomical unit?

  1. The Earth-Moon Distance

  2. The Earth-Sun Distance

  3. The Sun-Mercury Distance

  4. The Sun-Mars Distance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The transit of Venus provided a rare opportunity to accurately determine the Earth's distance from the Sun, which was crucial for understanding the scale and structure of the solar system.