Bihar STET Paper 1 Science Mock Test - 7 - Bihar PGT/TGT/PRT MCQ

The above reaction is an example of displacement reaction as in the above reaction the elemental Zinc is displacing hydrogen from the compound of hydrochloric acid which is released in the form of hydrogen gas. The Zinc then combines with Chlorine to form Zinc Chloride.

Methyl orange is a pH indicator frequently used in titration because of its clear and distinct colour variance at different pH values. Methyl orange shows pink colour in acidic medium and yellow colour in basic medium. Because it changes colour at the pH of a mid strength acid, it is usually used in titration for acids. Unlike a universal indicator, methyl orange does not have a full spectrum of colour change, but it has a sharp end point.

The chlor-alkali process is primarily aimed at producing sodium hydroxide through the electrolysis of an aqueous solution of sodium chloride. This process is crucial for various industries, including the production of soaps, detergents, and paper.

 Used as a cleansing agent in industries and households. It finds its application in paper, textile, soap, and detergent industries.

The correct option is C.
Acetic acid that is Carboxylic acids gives effervescence with NaHCO₃ solution.

Acids possess sour taste and turn blue litmus paper red.

Electronic configuration of

Na is 2, 8, 1

Ca is 2, 8, 8, 2

Incomplete combustion of fuel gives out sooty flame which contains unburnt carbon particles which deposits on the bottom of cooking utensils.

The correct option is D.
The atomic size is of the order of 10⁻⁸
cm or 10⁻¹⁰ m or one angstrom unit.
On the other hand, the radius of an atomic nucleus is of the order of 10⁻¹³
cm or 10⁻¹⁵ m or one Fermi unit.

Hydrogen sulfide gas produces an offensive "rotten egg" or "sulfur water" odor and taste in the water. In some cases, the odor may be noticeable only when the water is initially turned on or when hot water is run. Heat forces the gas into the air which may cause the odor to be especially offensive in a shower. Occasionally, a hot water heater is a source of hydrogen sulfide odor. The magnesium corrosion control rod present in many hot water heaters can chemically reduce naturally occurring sulfates to hydrogen sulfide.

It is known as boiling. And that temperature known as boiling temperature. When you change a liquid in to gas this process is called vaporization. The process by which a substance gets converted from liquid to gas under low temperature or heating is called evaporation.

Boiling point of water 100^oC +273 = 373k 

Melting point of water 0^oC = 273 K

Boiling point of Acetone = At atmospheric pressure acetone has a boiling point of 56°C

Melting poitn of aluminium = 660.3 °C

The bone marrow is composed of:
A: Muscle fibres and adipose tissue
- This is incorrect. Muscle fibres and adipose tissue are not components of bone marrow.
B: Areolar tissue and adipose tissue
- This is incorrect. Areolar tissue and adipose tissue are not components of bone marrow.
C: Adipose tissue and calcified cartilage
- This is incorrect. Calcified cartilage is not a component of bone marrow.
D: Adipose tissue, areolar tissue and blood vessels
- This is correct. Bone marrow is composed of:
- Adipose tissue: This is the main component of bone marrow and provides cushioning and support to the bone.
- Areolar tissue: This loose connective tissue helps in providing structural support to the bone marrow.
- Blood vessels: Bone marrow contains a network of blood vessels that supply oxygen and nutrients to the cells within the marrow.
In conclusion, the correct answer is D: Adipose tissue, areolar tissue, and blood vessels are the components of bone marrow.

Explanation:
To determine the mineral nutrient/element whose loss is compensated by growing a pulse crop between two cereal crops, we need to understand the concept of crop rotation and nutrient cycling.
Crop rotation:
Crop rotation is the practice of growing different crops in a sequence on the same piece of land. It is done to improve soil fertility, control pests and diseases, and increase crop yield.
Nutrient cycling:
Nutrient cycling refers to the process by which nutrients are taken up by plants, released into the soil through plant residues or root exudates, and then taken up by subsequent crops.
Role of pulse crops:
Pulse crops, such as peas, lentils, and beans, are known for their ability to fix atmospheric nitrogen through a symbiotic relationship with nitrogen-fixing bacteria. These bacteria convert atmospheric nitrogen into a form that can be utilized by plants. When the pulse crop is plowed back into the soil, it releases nitrogen into the soil, thus replenishing the nutrient levels.
The mineral nutrient/element compensated by pulse crops:
In this case, growing a pulse crop between two cereal crops helps compensate for the loss of nitrogen.
The correct answer is C: Nitrogen.
Here are the key points to remember:
- Crop rotation is the practice of growing different crops in a sequence on the same piece of land.
- Nutrient cycling refers to the process of taking up and releasing nutrients by plants and subsequent crops.
- Pulse crops have the ability to fix atmospheric nitrogen through a symbiotic relationship with nitrogen-fixing bacteria.
- When pulse crops are plowed back into the soil, they release nitrogen, replenishing the nutrient levels.
- Growing a pulse crop between two cereal crops helps compensate for the loss of nitrogen.
- The mineral nutrient/element compensated by pulse crops is nitrogen.

Atomic Number = Mass no. - No. Of neutrons
⇒ 295 - 196
⇒  99 
So, option ( a) is the correct answer.

The Bombay Duck fish is a lizard fish which is known  by many names such as Bummalo, Loytta, Bombil etc.

The Hilsa fish  is  a very popular  food fish in South Asia. It is also known by many names such as Ilish, Hilsa herring, Hilsa Shad, Ellis, Modar etc.

Bombay duck and Hilsa are prime example of marine fish as they are found  in salt water such as oceans or salt lakes, although the two varieties of hilsa namely Tenualosa ilisha and Tenualosa toli ilisha are found both in  marine and fresh waters of Bangladesh.

Maintaining a balanced sex ratio in society is essential to ensure equal representation of both genders. This balance fosters a harmonious environment where both males and females have equal opportunities and rights, ultimately contributing to a more inclusive and equitable society.

Mucus is a viscous secretion that protects the inner lining of the stomach from the action of HCl.

The ability of eye lens to focus near and far objects is called power of accommodation. 
Nearest point which the eye can see clearly is called near points. 
The farthest point to which the eye see clearly is known as far point. 
Least distance of distinct vision is the minimum distance at which eye can see the object clearly without strain.

Proteins serve as respiratory substrates when carbohydrates and fats are not readily available for energy production. In such circumstances, proteins are utilized as an alternative source of energy through the process of respiration. This highlights the flexibility of the human body in utilizing different macronutrients based on availability and metabolic needs.

Z to A approach deals with explaining application of a particular concept first and its effects later on. This makes the concepts clear and students develop interest in the concept.

Objective questions are beneficial to assess the knowledge of the complete syllabus in short time. Maximum syllabus can be covered by making objective type questions. Hence, this is the ideal way to assess whether the child has prepared entire syllabus or not.

The teacher should provide an overview of the main points before launching into the body of the speech. This tunes the mind of the students to capture information, which the teacher is about to provide to the students. The overview helps creating interest in the subject being taught, and the student anticipates things which he is about to learn, along with the combination of his previous knowledge and experience.

Continuous Comprehensive Evaluation is a school-based evaluation system. It promotes orderly learning and development. It includes regularity in assessment, diagnosis of learning gaps, retesting, etc. So, CCE emphasizes how learning can be observed, recorded, and improved upon. It is a 'continuous' process after each course over the entire session. 'Comprehensive' means the scheme follows both scholastic and co-scholastic aspects of students.
Hence, the correct answer is, 'How learning can be observed, recorded and improved upon.'

Education Policy lays particular emphasis on the development of the creative potential of each individual. It is based on the principle that education must develop not only cognitive capacities - both the ‘foundational capacities ’of literacy and numeracy and ‘higher-order’ cognitive capacities, such as critical thinking and problem solving – but also social, ethical, and emotional capacities and dispositions.

National Education Policy 2020-

According to NEP 2020, A good educational institution is one in which every student feels welcomed and cared for, where a safe and stimulating learning environment exists, where a wide range of learning experiences are offered, and where good physical infrastructure and appropriate resources conducive to learning are available to all students.

Key Points Some important fundamental principles of the NEP 2020 are- 

• Establishment of the linkage of the concepts with the environment or we can say that the linkage of the school with the home.
• It includes the overall development of the leader, it covers all three aspects as Cognitive domain, affective domain, and psychomotor domain.
• It will include Progress of the Child in Inquiry-Based Learning, Quiz, Projects Roleplay, Group Work, Portfolios, etc, as part of the assessment of the students.
• Promoting self-assessment and the peer assessment done by the student in the classroom.
• Making board examination low stake and less stressful by focusing on Logic and Core Competencies
• It emphasizes group work as well as individual work, NEP 2020 links the study to the curriculum.
• Hence we conclude that all the objectives given in the question are correct for the assessment of the student.

Important Points  There are many changes in the assessment of the child, proposed in NEP 2020:

• Continuous Tracking Of Learning Outcome Of Each Child.
• Board Examinations to be made more flexible with an assessment of essential skills.
• Assessment to focus on core concepts, higher-order, and foundational skills 
• AI-based soft wares to help track the progress of students to enable them to make optimal career choices.
• National Assessment Centre (PARAKH) will bring greater synergy to board examinations.
• Self Assessment & Peer Assessment.
• National Testing Agency (NTA) will work to offer a Common Aptitude Test of high quality to eliminate the need for coaching for these exams. 

Nalin Negi has been appointed as the Chief Executive Officer of BharatPe after serving as the interim CEO and CFO. Under his leadership, the company has seen significant revenue growth and achieved positive Ebitda, showcasing his experience and strategic capabilities in the fintech and banking sectors.

Peru has declared a health emergency in response to the surge in dengue fever cases, with over 31,000 reported cases and 32 fatalities in 2024. This declaration encompasses 20 out of Peru's 25 regions, highlighting the severity of the situation in the country.

Water contamination is the defilement of water bodies like lakes, streams, seas, aquifers and groundwater. This type of natural corruption happens when contaminations are specifically or in a roundabout way released into water bodies without satisfactory treatment to evacuate unsafe mixes.

The Indian government has built up around 18 biosphere reserves in India, which secure bigger ranges of characteristic living space (than a national park or animal sanctuary), and frequently incorporate one or more national parks alongside support zones that are interested in some monetary employments.

10 men = 20 women
Man : Woman = 2 : 1

Hence, Option B is correct.