Bihar STET Paper 1 Science Mock Test - 8 - Bihar PGT/TGT/PRT MCQ

Aquaculture is the production of useful aquatic plants and animals like prawns, fish, lobsters, crabs, mollusks, etc using various types of water resources.

 

When a base reacts with an acid, the primary outcome is the formation of salt and water. This reaction is a fundamental property of bases and acids when they neutralize each other's properties. The formation of salt and water signifies the completion of the chemical reaction between the acidic and basic components, resulting in a more stable and neutralized solution.

1 gram - atom nitrogen corresponds to mass of one mole of the nitrogen atom is grams that is one gram - atom of nitrogen represents 28 gms of nitrogen. 
It is equal to 6.023 * 10²³ N atoms, but not  
6.023 * 10²³ N2 molecules.
 

organism prepare their own food with the help of simple inorganic materials like CO₂,H₂O in sunlight with the help of chlorophyll. Thus, it doesn’t involve oxygen in the process.

Potential Site for Harnessing Tidal Energy in India:
The potential site for harnessing tidal energy in India is the Gulf of Kutch in Gujarat.
- Gulf of Kutch in Gujarat:
- Located in the western state of Gujarat, the Gulf of Kutch offers a favorable location for tidal energy harnessing.
- The Gulf of Kutch experiences strong tidal currents due to its proximity to the Arabian Sea.
- The region has a significant tidal range, with high and low tides occurring at regular intervals.
- The presence of narrow channels and creeks in the gulf helps to enhance the tidal energy potential.
- The area has been identified as suitable for setting up tidal energy projects due to its favorable tidal conditions.
- The development of tidal energy in the Gulf of Kutch can contribute to India's renewable energy goals and reduce reliance on fossil fuels.
Other Options:
- Northern areas: The northern areas of India, such as the Himalayan region, do not have significant tidal movements and are not suitable for harnessing tidal energy.
- Kalpakkam in Tamil Nadu: Kalpakkam is located on the east coast of India and does not have strong tidal currents, making it less suitable for tidal energy harnessing.
- Malabar coast: The Malabar coast, located in Kerala, experiences moderate tidal movements but may not have the ideal conditions for large-scale tidal energy projects.
In conclusion, the Gulf of Kutch in Gujarat is the potential site for harnessing tidal energy in India due to its strong tidal currents, significant tidal range, and favorable conditions for tidal energy projects.

Intrauterine contraceptive devices (IUCDs) such as Copper-T or loops are placed in the uterus to prevent pregnancy by blocking the fallopian tube in females. This prevents the transfer of eggs, thereby acting as an effective method of contraception.

The respiratory or gas - exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous  epithelium. This epithelium is exceedingly thin to facilitate diffusion  of oxygen and CO2. The alveolar walls also contain cuboidal surfactant - secreting cells.

Plants do not excrete urea and uric acid. These are nitrogenous wastes primarily excreted by animals. Plants handle waste products through vacuoles, fallen leaves, and excretion into the soil.

Mendel's Most Important Contribution to the Modern Understanding of Biology:

• The concept that hereditary information comes in discrete units:




• Mendel's experiments with pea plants led him to propose that hereditary traits are determined by discrete units of information.


• He called these units "factors" or "genes."


• This concept laid the foundation for the understanding of inheritance and the study of genetics.






• The concept of meiosis:




• Mendel's work indirectly contributed to the understanding of meiosis.


• Meiosis is the process by which cells divide to produce gametes (sex cells) with half the number of chromosomes.


• Mendel's observations of inheritance patterns in pea plants hinted at the existence of a mechanism that ensures the separation and recombination of genetic material during gamete formation.






• The concept of chromosome:




• Mendel's experiments did not directly involve the concept of chromosomes.


• However, his work laid the groundwork for understanding the relationship between genes and chromosomes.


• Later discoveries confirmed that genes are located on chromosomes, which are thread-like structures that carry genetic information.






• The concept that genes are ordered along chromosomes:




• Mendel's experiments did not directly address the concept of gene order along chromosomes.


• However, his work paved the way for understanding the principles of genetic linkage and mapping.


• Subsequent studies revealed that genes are arranged in a linear fashion along chromosomes.

Therefore, Mendel's most significant contribution to the modern understanding of biology is his concept that hereditary information comes in discrete units, which are now known as genes.

The majority of carbon dioxide is transported as part of the bicarbonate system. Carbon dioxide diffuses into red blood cells. Inside, carbonic Anhydrase converts carbon dioxide into carbonic acid, which is subsequently hydrolyzed into bicarbonate. 

Cadmium rods are used as control rods as they are capable of absorbing neutrons without themselves Fissioning. Boron rods are used as control rods in nuclear  reactor to control the fission rate of uranium and plutonium.

Almost everyone has around a 50% chance of having a boy and a 50% chance of having a girl. What we can say is that dad's sperm determines whether a baby will be a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first.

HIV-AIDS is a viral sexually transmitted disease, as mentioned in the content. It is caused by the human immunodeficiency virus (HIV) and can lead to acquired immunodeficiency syndrome (AIDS) if left untreated.

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.

The Murrah breed of water buffalo is kept for dairy production. It has been used to improve the milk production of dairy buffalo in other countries, such as Italy, Bulgaria and Egypt. The Murrah buffalo is jet black in colour, sometimes with white markings on the face or legs. They typically have short and tightly curved horns. Average milk production is 2200 litres in a lactation period of 310 days.

The most common are nearsightedness, farsightedness, astigmatism and presbyopia. Concave and convex lenses compensate for defects in the eye, bending light rays to place them precisely on the retin and correcting vison. A concave lens is thinner in the center and thicker on the edges. Concave lenses are used in the correction for near sightedness.

The element that possesses characteristic of both metal and non-metal are called metalloid. Arsenic is the element that has properties of both metal and non-metal

Teaching process includes three variables:

• Dependent variable: A student is a dependent variable.
• Independent variable: A teacher is an independent variable.
• Intervening variable: It plays a role for the interaction between other two variables. This includes content and methods of teaching.

Effective teacher: An effective teacher is one who is more than just an expertise in the academic field. Effective teaching happens when a teacher is successful in keeping the students actively involved in learning by providing a variety of learning experiences.

Important Points

He/she must fulfill the following characteristics to produce the highest learning outcome. 

• An effective teacher should focus on how well the students have understood a particular topic and motivate them to learn.
• Learning should go beyond the book and should be focused on instilling curiosity and inquisitiveness.
• An effective classroom is one where the < />teacher is a facilitator and a role model and not merely an instructor. It is a place where there is a lively and healthy interaction between students and teachers.
• The teacher can provide real-life examples to inspire students to learn and to connect the concepts with daily life.

Therefore, an Effective teacher provides a variety of learning experiences.

• One of the characteristics of an effective teacher is that he/she allows students to ask questions with respect to the subject matter.
• Complete the whole syllabus doesn't mean it could be effective
• The effective teacher should be punctual. They wouldn't like to pay the maximum time of the day to discuss the previous matter only for a few students. They would only recall the keywords and may arrange some extra classes for the absent students.

Learning is defined as a process of behavior modification through experiences, exercise, and efforts. Learning occupies a very important place in our life. It provides a key to the structure of our personality and behavior. Experience, direct or indirect, plays a very important and dominating role in molding and shaping the behavior of the individual from the very beginning.

In junior section, Mrs Singh is teaching about Earth, its shape and rotation by using a globe. In such teaching, learning take place by observation. Students observe the globe to get knowledge.

Observational learning is the learning that occurs through observation of the behavior of others. It is a form of social learning which takes various forms, based on various processes.

Learning is effective in an environment that is emotionally positive and satisfying to learners. Any learner who is emotionally unstable may not be able to learn anything. The teacher must make the environment conducive for students to study and learn efficiently.
Errors made by the students do not indicate that no learning has taken place. Instead, they are the windows through which a teacher can understand the thought process of the students.
Learning is affected by emotional factors at any stage. Emotions change over time as the child matures, and in response to changing environmental interactions. The kind of learning that takes place at different emotional levels also differs.
Learning involves physical, social and emotional activity also.

Learning is effective in an environment that is emotionally positive and satisfying to learners. Any learner who is emotionally unstable may not be able to learn anything. The teacher must make the environment conducive for students to study and learn efficiently.
Errors made by the students do not indicate that no learning has taken place. Instead, they are the windows through which a teacher can understand the thought process of the students.
Learning is affected by emotional factors at any stage. Emotions change over time as the child matures, and in response to changing environmental interactions. The kind of learning that takes place at different emotional levels also differs.
Learning involves physical, social and emotional activity also.

The Indian Air Force (IAF) is set to conduct ‘Gagan Shakti-2024’, the nation’s largest air military exercise, involving all Air Force stations. Held every five years, it will commence on April 1, 2024, at Pokhran’s field firing range. Approximately 10,000 airmen will participate, with maneuvers spanning the Western and Northern fronts. The Indian Army is aiding logistical support, ensuring synergy across sectors for operational rail mobilization.

South Korea experienced a further decline in its fertility rate, reaching a record low of 0.72 in 2023. This exacerbates concerns about population decline and highlights socio-economic factors influencing birth rates, such as career advancement concerns and financial burdens.

Former Pakistan Prime Minister and Pakistan Peoples Party (PPP) leader Yusuf Raza Gilani has been elected Chairman of the Senate, the upper house of Parliament. PML-N's Syedul Khan Nasir was elected unopposed as Deputy Chairman of the Senate. In a session of the Pakistani Senate, a total of 41 newly elected senators took oath as members of the House.

The students are required to understand the relative positions and relative distances of places. They must know how to use the scale and symbols. Drawing precisely according to the scale is not important.

Complement of 30°20′ = 90° – ( 30°20′ ) = 90° – ( 30° + 20′ )
= (89° – 30°) + (1° – 20′)
= 59° + 60′ – 20′ [ ∴ 1° = 60°′]
= 59° + 40′ = 59°40′.

i) Rohit walked 30m towards South.
ii) Took a left turn and walked 50m
iii) Again he took a left turn and walked 30m.
Drawing the Diagram as per the given information:

AB = CD = 50m
Thus we can see he is 50m far from the starting point.
Hence, the correct answer is "50m".

‘Knife’ is related to ‘Cut’, means we use knife for cutting.

Similarly,

We use pen for writing.

Hence, Write is the correct answer.