Question

Statement-Based MCQs on Nebula: Study

1. Consider the following statements about Nebulae:

1. Nebulae are giant clouds of dust and gas in space, made primarily of hydrogen and helium.
2. Some nebulae are formed from the explosion of dying stars like supernovae.
3. The Red Spider Nebula is an example of a supernova remnant.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: The Red Spider Nebula is a planetary nebula, not a supernova remnant, making statement 3 incorrect.

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2. Consider the following statements:

1. Nebulae can be regions where new stars are formed, hence referred to as "star nurseries."
2. The Helix Nebula is the closest known nebula to Earth, approximately 700 light-years away.
3. The gravity in a nebula causes the clumps of dust and gas to cool down and form stars.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: Statement 3 is incorrect because gravity causes the clumps of gas and dust to heat up, not cool down, leading to star formation.

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3. Consider the following statements about types of nebulae:

1. Planetary nebulae are formed when a dying star sheds its outer layers.
2. Dark nebulae emit light due to the ionization of their gas components.
3. Emission nebulae glow because the gas in them is ionized by nearby young stars.

Which of the above statements is/are correct?

a) 1 and 3 only
b) 2 only
c) 1, 2, and 3
d) 1 and 2 only

Answer: a) 1 and 3 only
Explanation: Statement 2 is incorrect because dark nebulae do not emit light; instead, they block light from other sources, making them appear dark.

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4. Consider the following statements:

1. Nebulae exist in interstellar space, which is the space between stars.
2. The gravity in a nebula pulls dust and gas together, eventually forming new stars.
3. The Red Spider Nebula, located in the constellation of Sagittarius, is 700 light-years away from Earth.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: Statement 3 is incorrect because the Red Spider Nebula is located 3,000 light-years away from Earth.

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5. Consider the following statements:

1. Supernova remnants are a type of nebula formed from the explosion of a dying massive star.
2. Planetary nebulae are formed from low-mass stars during the later stages of their evolution.
3. Nebulae are mostly composed of oxygen and carbon.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: Statement 3 is incorrect because nebulae are primarily composed of hydrogen and helium, not oxygen and carbon.

Answer 1

Statement-Based MCQs on Ukai Dam: In News

1. Consider the following statements regarding Ukai Dam:

1. The Ukai Dam, also known as Vallabh Sagar, is constructed across the Tapti River in Gujarat.
2. The Ukai Dam is the second-largest reservoir in Gujarat, following the Sardar Sarovar Dam.
3. Ukai Dam’s storage capacity is almost 46% of the total capacity of all other existing dams in India.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: Statement 3 is incorrect because the storage capacity of Ukai Dam is almost 46% of the total capacity of all other existing dams in Gujarat, not all of India.

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2. Consider the following statements about the Ukai Dam:

1. The Ukai Dam is an earth-cum-masonry dam with an embankment wall that is nearly 4,927 meters long.
2. The Tapti River, where Ukai Dam is located, is one of the three major rivers in peninsular India that flow in an east-to-west direction.
3. The primary purposes of the Ukai Dam are irrigation, power generation, and flood control.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3

Answer: d) 1, 2, and 3
Explanation: All statements are correct.

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3. Consider the following statements regarding the Tapti River and Ukai Dam:

1. The Tapti River, where Ukai Dam is located, originates in the Satpura Range in central India.
2. The Tapti River is one of the major rivers in peninsular India that flows into the Arabian Sea.
3. The Ukai Dam was constructed in 1972 to control flooding along the Narmada River.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 1 only
c) 2 and 3 only
d) 1, 2, and 3

Answer: a) 1 and 2 only
Explanation: Statement 3 is incorrect because the Ukai Dam was constructed on the Tapti River, not the Narmada River.

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4. Consider the following statements:

1. The Ukai Dam has a water spread area of about 52,000 hectares.
2. The embankment wall of the Ukai Dam is 80.77 meters high, whereas the masonry dam is 68.68 meters high.
3. The Ukai Dam's catchment area is roughly 62,255 km².

Which of the above statements is/are correct?

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2, and 3

Answer: d) 1, 2, and 3
Explanation: All statements are correct.

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5. Consider the following statements regarding the Ukai Dam:

1. Ukai Dam plays a significant role in generating hydroelectric power and providing irrigation facilities in Gujarat.
2. The dam was constructed across the Narmada River and is the largest reservoir in Gujarat.
3. Ukai Dam serves as a major flood control mechanism for the surrounding regions of Gujarat.

Which of the above statements is/are correct?

a) 1 and 2 only
b) 1 and 3 only
c) 2 only
d) 1, 2, and 3

Answer: b) 1 and 3 only
Explanation: Statement 2 is incorrect because the Ukai Dam is constructed on the Tapti River, not the Narmada River, and it is the second-largest reservoir in Gujarat.