Bihar STET Paper 1 Science Mock Test - 5 - Bihar PGT/TGT/PRT MCQ

Conversion of methane to Carbon tetrachloride is a substitution reaction as hydrogen atoms are replaced by chlorine atoms.

When the liquid starts boiling, the further heat energy which is supplied is absorbed as latent heat of vaporization by the liquid to change its state of matter.

The medulla oblongata is the primary respiratory control center. Its main function is to send signals to the muscles that control respiration to cause breathing to occur. There are two regions in the medulla that control respiration: The ventral respiratory group stimulates expiratory movements.

Like other greenhouse gases, nitrous oxide absorbs radiation and traps heat in the atmosphere, where it can live for an average of 114 years, according to the EPA.

Sensory impulses are integrated in the fore-brain before generating a response.

A physical change can affect the size, shape or color of a substance but does not affect its composition or mass. The substances may be changed to another phase (i.e. gas, liquid, solid) or separated or combined.

Examples:

when ice melts
when sulfur is mixed with iron filings. 
breaking a glass 
dissolving sugar in water

Contributions to the success of Mendel:
1. His knowledge of biology:
- Mendel's background in biology allowed him to understand the basic principles of inheritance and genetics.
- He was knowledgeable about the reproductive processes of plants, which allowed him to perform experiments and make accurate observations.
2. Qualitative analysis of data:
- Mendel meticulously collected and analyzed data from his experiments.
- He focused on qualitative traits, such as flower color or seed texture, rather than just counting the number of offspring.
- This approach allowed him to identify distinct patterns of inheritance and formulate his laws of genetics.
3. Observation of distinct inherited traits:
- Mendel chose to study traits that were easily distinguishable and occurred in distinct forms, such as tall vs. short plants or yellow vs. green peas.
- By selecting traits with clear-cut variations, he was able to easily track their inheritance patterns and make accurate predictions.
4. Consideration of one character at a time:
- Instead of studying multiple traits simultaneously, Mendel focused on one trait, such as flower color, in each experiment.
- This allowed him to establish clear and consistent patterns of inheritance for each trait and avoid confusion or overlap between different traits.
In conclusion, Mendel's success can be attributed to his knowledge of biology, his qualitative analysis of data, his observation of distinct inherited traits, and his consideration of one character at a time. These factors enabled him to make significant discoveries in the field of genetics and lay the foundation for modern understanding of inheritance.

An ecosystem comprises both biotic (living organisms) and abiotic (physical factors) components that interact and influence each other. This interconnected system includes plants, animals, microorganisms, physical surroundings like temperature, soil, and minerals. The balance in nature is maintained through the interactions between these living and non-living elements.

The one-holed cork is employed to close the opening of the test tube in the fermentation experiment to prevent air from entering. This setup helps create an anaerobic environment necessary for the fermentation process to occur efficiently. By limiting the entry of air, the fermentation process can proceed without interference, allowing the yeast to convert sugar into alcohol and carbon dioxide.

Whose name is not associated with the development of periodic Table?

The name that is not associated with the development of the periodic table is Rutherford.

Explanation:

• Prout's: William Prout, an English chemist, proposed the concept that all elements are made up of atoms and that the atomic weight of an element is a whole number multiple of the atomic weight of hydrogen. However, his ideas were not fully accepted and later experiments showed that his concept was not entirely accurate.


• Newlands: John Newlands, an English chemist, proposed the Law of Octaves in 1865. He arranged the known elements in order of increasing atomic weights and noticed that every eighth element had similar properties. Although his classification system was not widely accepted, it was a precursor to the modern periodic table.


• Rutherford: Ernest Rutherford, a New Zealand-born British physicist, is not associated with the development of the periodic table. He is well-known for his contributions to the understanding of the atom's structure, especially for his gold foil experiment which led to the discovery of the atomic nucleus.


• Lothar Meyer: Lothar Meyer, a German chemist, independently published a periodic table in 1869, around the same time as Dmitri Mendeleev. Meyer's table arranged the elements based on their atomic volumes, which is a precursor to the modern periodic table. However, his work did not gain as much recognition as Mendeleev's.

Therefore, the correct answer is C: Rutherford.

B is the correct option.
1.Aerosol particles originating from urban and industrial pollution or smoke from fires have been shown to affect cloud microphysics, cloud reflection of sunlight to space, and the onset of precipitation.
2. a fine dispersion of minute droplets of one liquid in another in which it is not soluble or miscible.
3.Whipped cream is an air-in-water foam in which air cells are surrounded by a film containing fat droplets stabilized by a film of protein. 
4. The use of sol-silicate paint protects the old substrate from further destruction due to UV exposure, and creates an absolutely lightfast and colour-stable surface. 

The strict biological definition of a fish, above, is sometimes called a true fish. True fish are also referred to as finfish or fin fish to distinguish them from other aquatic life harvested in fisheries or aquaculture.

Summer adaptation capacity/ tolerance to high temperature. Low maintenance requirements. 
Reduction in the size of the egg-laying birds with ability to utilise more fibrous cheaper diets formulated using agricultural by-products.

Red pigment of vertebrate blood is haemoglobin. Haemoglobin is a conjugated protein. It consists of a basic protein globin joined to a nonprotein group heme, hence the name haemoglobin. Heme is an iron-porphyrin ring. A mammalian haemoglobin molecule is a complex of 4 heme molecules joined with 4 globin molecules.

Cytokinin is a plant hormone that plays a crucial role in promoting cell division. It is found in higher concentrations in fruits and seeds, contributing to growth and development in these plant parts. Cytokinins help regulate various physiological processes, including cell division, differentiation, and overall plant growth.

X = Mg

Because Mg has valency 2 and valency in a group remains the same.

When Mg combines with chlorine it forms MgCl2.

Contrasting Traits Studied by Mendel:
Mendel's experiments with pea plants involved the study of several contrasting traits. He meticulously observed and recorded the characteristics of the plants and their offspring. The traits studied by Mendel can be summarized as follows:
1. Seed Color:
- Contrasting traits: Yellow seeds vs. Green seeds.
2. Seed Shape:
- Contrasting traits: Round seeds vs. Wrinkled seeds.
3. Flower Color:
- Contrasting traits: Purple flowers vs. White flowers.
4. Flower Position:
- Contrasting traits: Axial flowers (along the stem) vs. Terminal flowers (at the tip of the stem).
5. Pod Color:
- Contrasting traits: Green pods vs. Yellow pods.
6. Pod Shape:
- Contrasting traits: Inflated pods vs. Constricted pods.
7. Stem Length:
- Contrasting traits: Tall stems vs. Dwarf stems.
Therefore, Mendel studied a total of seven contrasting traits in pea plants. These traits played a crucial role in his formulation of the laws of inheritance and laid the foundation for modern genetics.

The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear. In the inner ear, the pressure variations are turnedinto electrical signals by the cochlea. These electrical signals are sent to the brain via the auditory nerve, and the brain interprets them as sound.

Classroom management: Classroom management refers to the actions and strategies teachers use to solve the problems of order in classrooms.

It involves activities such as:

• stating a set of ground rules for the classroom and organizing instruction
• taking charge of the classroom activities
• creating a productive learning environment
• planning strategies to deal with potential problems

NOTE:

It is said that a teacher is a friend, philosopher and guide because a teacher plays all these vital roles in respect of pupils. It is based on the intent and capacity that a teacher possesses, exposed to which, a student is influenced to make a positive difference in his own life as well as in the society and the world at large.

Successful teachers are those who have the ability to maximise the learning potential of all students in their class. Developing positive relationships between a teacher and student is a fundamental aspect of quality teaching and student learning. In order to develop rapport with pupils, a teacher should behave with them in a democratic way, guide them, and he should have communicative ability.
Gillespie recognised that the inherent qualities of a student-teacher relationship (caring, knowing, trust and mutual respect) and a teacher's rapport with students results in a classroom environment where students are affirmed and supported to achieve their best.

A good teacher is one who draws attention of students towards himself. If at any moment he finds that students are not attentive towards him, then he should start evaluating his teaching methods and find out the areas where he lags, and hence should modify his methodology, to catch attention of students and take necessary steps to improve himself.

Liking for the profession not only in teaching but any other activity is foremost important to emerge out successfully. A teacher can effectively achieve this only if he has liking for his profession and he puts in all his efforts for the same.

A knowledge survey is a method of evaluating the delivery of a course through the gathering of feedback from the learner on the level of the knowledge they acquired after the completion of the instruction. It usually consists of questions that cover the content of the course. The surveys evaluate student learning and content mastery at all levels: from basic knowledge and comprehension through higher levels of thinking. Knowledge surveys can serve as both formative and summative assessment tools.

Kerala - Kathakali
Orissa - Odissi
Tamil Nadu - Bharatnatyam
Assam - Bihu

Weight of the car = (180 × 7 – 72 × 6) = 828 kg
Hence, Option B is correct.

First Number x Second Number = HCF x LCM
Then, 75 x Second Number = 15 x 225
Second Number latex ={ 15 x 225}/75 = 45$
Therefore, other number is 45. 

The pattern followed here is;

15 is the wrong term that doesn't follow the pattern here.

There should be 12.5 in place of 15.

Hence, "15" is the correct answer.

Given:

Five years ago, father's age was 5 times that of his son

After 3 years father will be 3 times as old as his son

Calculation:

Let the present age of son be x years 

Present age of father be y years 

According to the question,

Five years ago, father's age was 5 times that of his son

(y - 5) = 5 (x - 5)

⇒ y - 5 = 5x - 25 

⇒ y - 5x + 20 = 0     ---- (i)

After 3 years father will be 3 times as old as his son

(y + 3) = 3(x + 3)

⇒ y + 3 = 3x + 9

⇒ y - 3x - 6 = 0      ---- (ii)

Solving equation (i) and (ii) we get,

x = 13

∴ Present age of son is 13 years