Before Moving ahead , Please read the question paper attached below :

The Question-wise detailed solution is here :

Question 1: Which one of the following elements is higher in concentration in a human body?

Options: (a) Hydrogen, (b) Carbon, (c) Nitrogen, (d) Oxygen

Solution: The human body is primarily composed of a few key elements, and their concentrations can be understood based on their roles in biological molecules like water, proteins, and organic compounds. The approximate elemental composition of the human body by mass is:

• Oxygen: ~65% (major component of water and organic molecules)
• Carbon: ~18% (backbone of organic molecules like proteins, carbohydrates, and lipids)
• Hydrogen: ~10% (present in water and organic molecules)
• Nitrogen: ~3% (found in proteins and nucleic acids)

Explanation:

• Oxygen is the most abundant element due to its presence in water (H₂O, which makes up about 60% of body mass) and organic compounds.
• Carbon is the second most abundant, forming the backbone of organic molecules.
• Hydrogen is significant due to its presence in water and organic molecules but is less abundant than oxygen and carbon.
• Nitrogen is present in smaller amounts, mainly in proteins and nucleic acids.

Since 65% (oxygen) is greater than 18% (carbon), 10% (hydrogen), and 3% (nitrogen), oxygen has the highest concentration.

Answer: (d) Oxygen

Question 2: Which one of the following is the habitat for the Great Indian Bustard?

Options:

(a) Freshwater ecosystem,

(b) Arid ecosystem,

(c) Coastal ecosystem,

(d) Himalayan ecosystem

Solution: The Great Indian Bustard (Ardeotis nigriceps) is a large bird native to India, known for its critically endangered status. It primarily inhabits grasslands and semi-arid regions, which are characterized as arid ecosystems.

Explanation:

• Freshwater ecosystem: Includes rivers, lakes, and wetlands, which are not suitable for the Great Indian Bustard, as it is a terrestrial bird.
• Arid ecosystem: Includes grasslands, scrublands, and semi-arid regions, which align with the natural habitat of the Great Indian Bustard, found in places like Rajasthan and Gujarat in India.
• Coastal ecosystem: Includes beaches and mangroves, which are not the habitat of this species.
• Himalayan ecosystem: The high-altitude, cold environment of the Himalayas is unsuitable for this bird.

The Great Indian Bustard thrives in open grasslands and arid regions, making the arid ecosystem the correct choice.

Answer: (b) Arid ecosystem

Question 3: Which one of the following category of plants has naked seeds that are not enclosed by ovary walls?

Options: (a) Angiosperms, (b) Gymnosperms, (c) Pteridophytes, (d) Bryophytes

Solution: To determine which plants have naked seeds (seeds not enclosed by ovary walls), we need to understand the characteristics of each plant group:

• Angiosperms: Flowering plants with seeds enclosed within an ovary (e.g., fruits like apples).
• Gymnosperms: Plants with naked seeds that are not enclosed in an ovary, often borne on cones (e.g., pines, firs).
• Pteridophytes: Ferns and allies that reproduce via spores, not seeds.
• Bryophytes: Mosses and liverworts that lack seeds and reproduce via spores.

Explanation:

• Gymnosperms (e.g., conifers) produce seeds that are exposed on cones or similar structures, not enclosed by ovary walls, fitting the description of “naked seeds.”
• Angiosperms have seeds enclosed in fruits, so they do not qualify.
• Pteridophytes and Bryophytes do not produce seeds at all, so they are irrelevant to the question.

Thus, Gymnosperms are the plants with naked seeds.

Answer: (b) Gymnosperms

Question 4: Which one among the following animal groups can regulate their body temperatures regardless of their environment?

Options: (a) Reptiles and mammals, (b) Mammals and birds, (c) Amphibians and reptiles, (d) Birds and amphibians

Solution: Animals that can regulate their body temperature regardless of the environment are called endotherms (warm-blooded). These animals maintain a constant internal body temperature through metabolic processes.

• Mammals: Endothermic, capable of regulating body temperature (e.g., humans maintain ~37°C).
• Birds: Also endothermic, maintaining constant body temperature.
• Reptiles: Ectothermic (cold-blooded), relying on the environment to regulate body temperature.
• Amphibians: Ectothermic, unable to regulate body temperature internally.

Explanation:

• Option (a): Reptiles are ectothermic, so this is incorrect.
• Option (b): Both mammals and birds are endothermic, making this the correct choice.
• Option (c): Both amphibians and reptiles are ectothermic, so this is incorrect.
• Option (d): Amphibians are ectothermic, so this is incorrect.

Only mammals and birds can regulate their body temperature independently.

Answer: (b) Mammals and birds

Question 5: If for some positive integer k, 543 + 5k is divisible by 7, then which one of the following could be the value of k?

Options: (a) 42, (b) 44, (c) 46, (d) 48

Solution:

Answer: (b) 44

Question 6: If * operation on the set of integers is defined as x∗y=2x+y−xyx * y = 2x + y – xyx * y = 2x + y - xy, then (3∗2)∗(2∗1)(3 * 2) * (2 * 1)(3 * 2) * (2 * 1) is:

Options: (a) 1, (b) 2, (c) 3, (d) 4

Answer: (a) 1

Question 7: The number of four-digit even numbers formed by the digits 0, 2, 4, 6, 8 without repetition is:

Options: (a) 12, (b) 24, (c) 48, (d) 96

Answer: (d) 96

Question 8: The marked price (x) of an item is increased by 10% and subsequently decreased by 15%. If the final price is y, then:

Options: (a) x=yx = yx = y

(b) x<yx < yx < y

(c) x>yx > yx > y

(d) Cannot be determined

Answer: (c) x>y

Question 9: Which of the following are the major constituents of dry air in the lower atmosphere?

Options: (a) Water vapour and oxygen, (b) Nitrogen and oxygen, c) Nitrogen, oxygen, and methane, (d) Nitrogen, oxygen, water vapour, and methane

Solution: Dry air in the lower atmosphere (troposphere) primarily consists of:

• Nitrogen: ~78%
• Oxygen: ~21%
• Argon: ~0.93%
• Carbon dioxide: ~0.0407%
• Trace amounts of other gases (e.g., methane, neon).

Explanation:

• Dry air excludes water vapour, which varies in concentration (0–4%) in the atmosphere but is not a constituent of dry air.
• Nitrogen and oxygen make up ~99% of dry air, making them the major constituents.
• Methane is present in trace amounts (~1.8 ppm), not a major constituent.
• Water vapour is not included in dry air.
• Option (a): Water vapour is not part of dry air.
• Option (b): Nitrogen and oxygen are the primary constituents.
• Option (c): Methane is a trace gas, not a major constituent.
• Option (d): Water vapour and methane are not major constituents of dry air.

Answer: (b) Nitrogen and oxygen