MCQs
Total Questions : 639
| Page 62 of 64 pages
Answer: Option C. -> conversion of Hydrogen to Helium.
Answer: (c)
The inexhaustible source of energy of the stars is due to the conversion of Hydrogen to Helium. In the interior of a star, the particles move rapidly in every direction because of the high temperatures present. Every so often a proton moves close enough to a nucleus to be captured, and a nuclear reaction takes place.
Only protons of extremely high energy (many times the average energy in a star such as the Sun) are capable of producing nuclear events of this kind. A minimum temperature required for fusion is roughly 10 million K. Since the energies of protons are proportional to temperature, the rate of energy production rises steeply as temperature increases.
Answer: (c)
The inexhaustible source of energy of the stars is due to the conversion of Hydrogen to Helium. In the interior of a star, the particles move rapidly in every direction because of the high temperatures present. Every so often a proton moves close enough to a nucleus to be captured, and a nuclear reaction takes place.
Only protons of extremely high energy (many times the average energy in a star such as the Sun) are capable of producing nuclear events of this kind. A minimum temperature required for fusion is roughly 10 million K. Since the energies of protons are proportional to temperature, the rate of energy production rises steeply as temperature increases.
Answer: Option C. -> Its weight decreases
Answer: (c)
Answer: (c)
Answer: Option A. -> Both 1 and 2
Answer: (a)The earth is nearest to the sun on about January 3rd. Earth is farthest from the sun on about 4th July.
Answer: (a)The earth is nearest to the sun on about January 3rd. Earth is farthest from the sun on about 4th July.
Answer: Option A. -> earth’s rotation
Answer: (a)The Coriollis effect is the apparent deflection of global winds, ocean currents that moves freely across the Earth’s surface. The deflection is due to the rotation of the Earth on its axis.
Answer: (a)The Coriollis effect is the apparent deflection of global winds, ocean currents that moves freely across the Earth’s surface. The deflection is due to the rotation of the Earth on its axis.
Answer: Option A. -> an exploding Star
Answer: (a)
A supernova is a stellar explosion that is more energetic than a nova. During this short interval, a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.
The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).
Answer: (a)
A supernova is a stellar explosion that is more energetic than a nova. During this short interval, a supernova can radiate as much energy as the Sun is expected to emit over its entire life span.
The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light).
Answer: Option A. -> Uranus
Answer: (a)The atmosphere of Uranus is composed of 83% hydrogen, 15% helium, 2% methane and small amounts of acetylene and other hydrocarbons. Methane in the upper atmosphere absorbs red light, giving Uranus its blue-green colour.
Answer: (a)The atmosphere of Uranus is composed of 83% hydrogen, 15% helium, 2% methane and small amounts of acetylene and other hydrocarbons. Methane in the upper atmosphere absorbs red light, giving Uranus its blue-green colour.
Answer: Option A. -> January 3
Answer: (a)The Earth is closest to the Sun or at the perihelion on January 3, when it is winter in the Northern Hemisphere.
Answer: (a)The Earth is closest to the Sun or at the perihelion on January 3, when it is winter in the Northern Hemisphere.
Question 618. Study the following statements and select the correct answer from the codes given below:
- The average density of rocks in the lower crust of the earth is 3.
- There is a gradual decrease in the velocity of the seismic waves through the lower crust.
- The mantle-core boundary is marked by Moho-discontinuity.
- The outer core of the earth is in molten form.
Answer: Option B. -> 1 and 4 are correct
Answer: (b)The crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle.The Earth’s crust is composed of distinctly different continental crust and oceanic crust, which have different chemical compositions and physical properties, and which were formed by different geological processes.
Answer: (b)The crust is the outermost solid shell of a rocky planet or natural satellite, which is chemically distinct from the underlying mantle.The Earth’s crust is composed of distinctly different continental crust and oceanic crust, which have different chemical compositions and physical properties, and which were formed by different geological processes.
Answer: Option D. -> conversion of hydrogen to helium
Answer: (d)
A star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star’s interior and then radiates into outer space.
Answer: (d)
A star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star’s interior and then radiates into outer space.
Answer: Option C. -> 7°30’ W .
Answer: (c)
Answer: (c)
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