Bihar STET Paper 1 Science Mock Test - 6 - Bihar PGT/TGT/PRT MCQ

Precipitation is the creation of a solid from a solution. When the reaction occurs in a liquid solution, the solid formed is called the 'precipitate'. The chemical that causes the solid to form is called the 'precipitant'.

The milky appearance of lime water in the fermentation experiment serves as an indicator of the release of carbon dioxide. This change occurs as a result of the carbon dioxide liberated from the sugar solution and yeast mixture during the fermentation process. The observation of lime water turning milky provides visual evidence of the production of CO2, showcasing one of the outcomes of the fermentation of sugar.

Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

The simplest organic compounds are made up of only carbon and hydrogen atoms. Compounds of carbon and hydrogen only are called hydrocarbons. For example, methane.

What is spectrum-
The spectrum refers to the band of colors that is produced when white light is passed through a prism or diffracted by a grating. It is a fundamental concept in physics and optics and is an essential component of understanding the behavior of light.
The band of 7 colors:
- The spectrum is commonly represented as a band of 7 colors: red, orange, yellow, green, blue, indigo, and violet. This is often remembered using the acronym "ROYGBIV".
- Each color in the spectrum corresponds to a different wavelength of light, with red having the longest wavelength and violet having the shortest.
The band of 5 colors:
- This option is incorrect as the spectrum consists of 7 colors, not 5.
The band of 6 colors:
- This option is also incorrect as the spectrum consists of 7 colors, not 6.
None of these:
- This option is incorrect as the correct answer is option A, which states that the spectrum is the band of 7 colors.
In conclusion, the correct answer is option A, which states that the spectrum is the band of 7 colors. This band of colors is a result of the dispersion of white light and is an important concept in physics and optics.

It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.

When an acid reacts with a metal, a metal salt and hydrogen are formed. However, this depends if the metal is reactive or not. For example, magnesium, (Mg) is a violently reactive metal to hydrochloric acid) Therefore, making magnesium chloride and hydrogen

Product Formed when CO combines with Haemoglobin

• Oxyhaemoglobin: When oxygen (O2) combines with haemoglobin (Hb), it forms oxyhaemoglobin. This is the normal and desired form of haemoglobin in the blood.


• Carbaminoglobin: When carbon dioxide (CO2) combines with haemoglobin, it forms carbaminoglobin. This process is known as carbamino formation. It occurs in the tissues where CO2 is produced as a waste product.


• Carboxyhaemoglobin: When carbon monoxide (CO) combines with haemoglobin, it forms carboxyhaemoglobin. Carbon monoxide has a higher affinity for haemoglobin than oxygen, which can lead to a decrease in the oxygen-carrying capacity of the blood.


• All of These: The correct answer to the question is option C, which states that all of these products (oxyhaemoglobin, carbaminoglobin, and carboxyhaemoglobin) are formed when CO combines with haemoglobin.

Therefore, the product formed when CO combines with haemoglobin is carboxyhaemoglobin, along with oxyhaemoglobin and carbaminoglobin.

The fluid-filled balloon inside the cranium acts as a shock absorber for the brain, absorbing impact forces and reducing the risk of damage to the brain tissue during sudden movements or external impacts. This protective mechanism helps safeguard the brain from injuries that could impair its vital functions.

Artificial ecosystems, like gardens or aquariums, are man-made environments where humans control and manipulate the ecosystem's components. Unlike natural ecosystems, which develop independently, artificial ecosystems are created by humans for specific purposes such as growing specific plants or keeping certain animals in captivity.

Option ( a) Na metal is the correct answer because other options ( b) ,( c) and ( d) are used to distinguish ethanol from ethanoic acid.

Animal cells do not have cell Wall because they do not need them. Cell walls , which are found in plant cells , maintain cell shape, almost as if each cell has its own exoskeleton.

The postulates of Dalton’s Atomic theory that is the result of the law of conservation of mass in the relative numbers and kinds of atoms are constant in a given compound. Atoms cannot be created nor destroyed in a chemical reaction.

De Vries Mutation Theory:
The De Vries mutation theory, proposed by Dutch botanist Hugo de Vries in the late 19th century, revolutionized the understanding of genetic inheritance. De Vries conducted extensive research on plant hybrids and discovered the concept of mutation, which challenged the prevailing theory of blending inheritance.
Plant Popularized by De Vries Mutation Theory:
The plant that was made popular by the De Vries mutation theory is Oenothera lamarkiana. This plant species, also known as Lamarck's evening primrose, played a significant role in De Vries' studies on mutations. He observed sudden and heritable changes in the traits of Oenothera lamarkiana, which led him to propose the concept of mutation as a mechanism for genetic variation.
Other Options:
While Oenothera lamarkiana is the correct answer, it's helpful to know about the other options as well:
- Triticum vulgare: This refers to common wheat, which is not directly associated with De Vries' mutation theory.
- Pisum sativum: This refers to garden pea, which is famous for Gregor Mendel's experiments on inheritance, not specifically related to De Vries' research.
- Primula vulgaris: This refers to the common primrose, which is not directly linked to De Vries' mutation theory.
Conclusion:
Oenothera lamarkiana is the plant species that gained prominence through the De Vries mutation theory. De Vries' research on this plant demonstrated the occurrence of sudden and heritable changes, leading to the concept of mutation as a mechanism for genetic variation.

Aarav's behavior suggests that he may be experiencing difficulty with his vision, such as nearsightedness or myopia, which can cause him to need to sit closer to the blackboard and hold the book closer to his eyes in order to see clearly.

Key Points

• The teacher should consult with school administrators and/or parents to explore the possibility of Aarav having an undiagnosed vision problem.
• Seeking professional support from an optometrist or ophthalmologist can help determine if Aarav needs corrective lenses or other interventions to improve his vision.
• If Aarav is diagnosed with a vision problem, appropriate accommodations can be made in the classroom, such as providing him with a seat closer to the blackboard or providing him with a larger print version of the reading material.

Thus, it is concluded that seeking professional support to check for low vision is the correct answer.

All exams must be conducted for the backward children. Emphasis must be paid on providing proper education to them so that they can easily face all examinations.

Government e Marketplace (GeM) has achieved a remarkable GMV of ₹4 lakh crore in fiscal year 2023-24, doubling from the previous year. This growth highlights the platform's significant procurement of services and its plans for potential expansion, including opening the portal for consumer use and enhancing services.

Renu Sud Karnad has been appointed as the chairperson and independent director of PayU Payments Private Ltd. Her extensive experience, including her tenure at HDFC Bank, highlights PayU's strategy of leveraging seasoned leadership to navigate the evolving fintech landscape.

Aishwary Pratap Singh Tomar won the gold medal in the 50m rifle 3P event at the 2023 Asian Shooting Championship with a final score of 463.5. He defeated China's Tian Jiaming, who won the silver medal with a score of 462.7. Tomar's impressive performance at the Asian Shooting Championship made him the most successful Indian shooter at the event. He is a rising star in the sport of shooting and is expected to challenge for medals at the 2024 Summer Olympics.

Xerophytes are plants which are adjusted to dry/desert zones. To survive these unforgiving conditions, they have uncommon elements. For instance, a desert plant has white hairs which avert water misfortune.

The planet Venus is also known as 'Earth's twin', the reason being that Venus and Earth are practically of the same size, with equivalent mass and have fundamentally the same arrangement of the same material. They are likewise neighbouring planets.

Agenda 21 is an extensive arrangement of action to be made universally, broadly and locally by associations of the United Nations System, governments and major groups in each territory in which human affects the Earth.

(The volume of cube = side³)
The ratio of sides = ∛8 : ∛27 = 2 : 3
Hence, Option B is correct.

Perimeter of the wheel

Hence, Option B is correct.

The pattern followed is:

Top right number = multiplication of top left number and bottom number 

In fig 1:

729 = 81 × 9

729 = 729

In fig 2:

512 = 64 × 8

512 = 512

Similarly,

In fig 3:

? = 49 × 7

? = 343 

Hence, the correct answer is "343".