Bihar STET Paper 2 Physics Mock Test - 6 - Bihar PGT/TGT/PRT MCQ

I=(I1)cosωt+(I₂)sinωt
(I²)_mean=I₁²cos²ωt+I₂²sin²ωt+I₁I₂cosωtsinωt
I₁²×(1/2)×i₂²×(1/2)+2_I1I₂×0
I_rms=√(i²)_mean=√(I₁²+I₂²/2)=(1/√2)( I₁²+I₂²)^1/2

The angular momentum L of the particle is given by

Kinetic Energy is transferred to other forms of energy—such as thermal energy, potential energy, and sound—during the collision process. After collision if recovery of kinetic energy is less than % then it is called inelastic collision i.e.. some part of kinetic energy is not recover. So that in an inelastic collision the total kinetic energy after the collision is less than before the collision

In calcite crystal there is a phenomenon of double refraction. So, we see one dot as a stationary object whereas the other being refracted at a little displaced position seems to be rotating about the first dot.

Voltage across the electrodes of a cathode ray gun, V=500V
Charge of the electron=1.6x10^-19
Energy=eV
E= 1.6x10^-19 x 500
E=800 x 10^-19 J
E=8 x 10^-17 J

The speed of any electromagnetic waves in free space is the speed of light c = 3x10⁸ m/s. Electromagnetic waves can have any wavelength λ or frequency f as long as λf = c.

Electric field inside the charged spherical shell is zero as there is no charge inside it.

CONCEPT:

• Conservative force: A force is conservative if the work done by the force in displacing an object from one point to another point is independent of the path followed by the object and depends only on the endpoints.
• Electrostatic forces, gravitational forces, elastic forces, magnetic forces, etc and are examples of conservative forces.

• Non-conservative forces: A force is said to be non-conservative if work done by or against the force in moving a body from one position to another, depends on the path followed between these two positions.
• Examples:  Frictional force, Viscous force, Airdrag, etc.

EXPLANATION:

• Suppose a particle starts at A and a force F_ext is acting on it. The particle is moved around the loop using the same force, F_ext
• Suppose the particle eventually ends up at A itself then the entire displacement of the particle is zero which means the total work done is zero.
• A total work of one zero means there is no expenditure of energy which means the total energy is conserved. Hence statement p is correct
• The total displacement of a particle in a closed loop is zero, which means the total work done is zero. Hence statement q is correct.
• The total mechanical energy of a system is given by 

⇒ Total energy = Potential Energy + Kinetic energy

• From the statement p, it is clear that if the total work done is zero it means the energy is conserved.
• Which means Gain in kinetic energy = Loss in Potential Energy. Hence option r is correct.

Cosφ=R/Z=R/√R²/ ω²L²=5/√(25+(50)²x (0.1)²)
=5/√(25+25)=1/√2
⇒φ=π/4

The magnifying power of a telescope tells us how much closer an object appears when viewed through the telescope. If a telescope has a magnifying power of 10, it means the object appears 10 times nearer than it actually is. So, a tree at a certain distance will seem to be at one-tenth of its real distance from the observer.

Magnification of a telescope is given by:
M= θ_i/θ_o​ ​​
10= (h/d_i)/(h/d_o​) ​​
10= d_o​​/d_i​
Distance of image, d_i​=d_o​​/10

This does not mean the tree appears taller; rather, its apparent distance is reduced by a factor of 10, making it appear 10 times nearer.

x₁ + x₂ = l₁

Differentiating with respect to time,  we get v₁ + v₃ = 0

 Again differentiating w.r.t. time, 

In a p-type semiconductor, the holes are the majority carriers, while the electrons are the minority carriers. A p-type semiconductor is obtained when trivalent atoms, such as aluminium, are doped in silicon atoms.

According to Fleming’s right-hand rule induced current flows from Q to P.
Hence P is at higher potential and Q is at lower potential. 
Therefore, A is positively charged and B is negatively charged.
Hence:
q_A​=+800μC and q_b​=−800μC

If a particle is moving with angular velocity=ω
Its angle of rotation is given by ωt 
Now displacement= length of line AB
Position vector of a particle is given by
R =iacosωt + jasinωt
R_o=ai
displacement =R−R_o
=a(cosωt−1)i+asinωj
d=√[(a(cosωt-1))²+(asinω)²]
=a√(2(1-cosωt))=a√(2×2(sinωt/2)²)=2asinωt/2

Explanation:
Mass of troly M = 200Kg
mass of child m = 20Kg
speed of trolley v = 36Km/hr=36 x 5/18 = 10m/s
Let v' be the final velocity of the trolley with respect to the ground.
Final velocity of the boy with respect to the ground = v,−4
from conservation of linear momentum

Time taken by the boy to run t = 10/4 = 2.5 sec
Distance moved by the trolley = vt = 10.36 x 2.5 = 25.9 m

The rate of development of an individual child is different from that of another child. This principle is known as the ‘principle of individual differences’. For instance, some children may learn to walk in 8 months, while some may take more than a year to start walking. 

It is important for teachers to know variables such as physical characteristics, intelligence, perception, gender, ability, learning styles, which are individual differences of learners. An effective and productive learning-teaching process can be planned by considering these individual differences of students.

The NRF (National Research Foundation) will be governed, independently of the government, by a rotating Board of Governors consisting of the very best researchers and innovators across fields.

Key Points

•  The goal of the NRF will be to enable a culture of research to permeate through our universities.
• The primary activities of the NRF will be to:
  •  fund competitive, peer-reviewed grant proposals of all types and across all disciplines.
  •  seed, grow and facilitate research at academic institutions.
  • act as a liaison between researchers and relevant branches of government as well as industry; so as to allow breakthroughs to be optimally brought into policy and/or implementation.
  • recognize outstanding research and progress.

Thus, it is concluded that According to NEP‐2020, National Research Foundation (NRF) may be established to enable a culture of research to permeate through universities.

Multiple means of discrimination is not a part of universal design for learning guidelines.

Teachers are the most important resources in educational settings. They are the key figures for any changes required in the educational field.

A good teacher is one who teaches in an interesting manner so that children enjoy learning because when a teacher makes learning interesting and enjoyable, it helps learners in the:

• participating willingly and happily.
• retaining information for a longer period.
• assimilating concepts easily and effectively.
• nurturing their curiosity in the learning process.
• enhancing skills and understanding of the concept.

Hence, it could be concluded that a good teacher is one who teaches in an interesting manner so that children enjoy learning.

Related to teacher questioning is the use of teacher probes. Probing or delving occurs when a student does not respond to a teacher's question. Probes are teacher assists that support the student to answer.

Key Points  Probing:

• Probing helps students to clarify their thinking, surface their reasoning, and explore alternative perspectives or solutions.
• A probing question makes a student think more deeply about the topic at hand, thereby engaging him/her in more cognitively rigorous instruction.
• This is especially important for lower-achieving students who may have begun to doubt their own capabilities and withhold effort.
• Seeing their teachers make a special effort to help them can enhance students’ self-confidence and willingness to exert effort in learning.
• The question stems that follow are examples of teacher probes that can support students to think more deeply.

Hence, the approach that encourages students to elaborate on an answer - either their own or another student is called probing.

Additional Information

• Structuring is defined by Hospel and Galand (2016) as “the amount and the clarity of information given to students about how to satisfy teachers' expectations and achieve the desired educational outcomes.”
• Teacher task orientation is a key behavior that refers to how much classroom time the teacher devotes to the task of teaching.
  • The more time dedicated to the task of teaching a specific topic, the greater the opportunity students have to learn.
• Remediation is also colloquially known as “re-teaching,” as it assumes that the student has been introduced to concepts previously but has not yet mastered them.
  • Remediation enables teachers to spot blind spots in students' learning and quickly assess and correct them.

Brainstorming is a creative group work in which group members produce large number of ideas quickly on a given topic or problems for subsequent evaluation. In this method, anyone can exchange remarks with anyone except that the participants are not allowed to criticize the ideas. Sometimes, quantity of ideas is more important than quality. Spontaneity is the hallmark of brainstorming sessions. On the spot ideas are expected.

The National Education Policy (NEP) was approved by the Union Cabinet in July 2020 and aims to implement various improvements to the Indian educational system from the school level to the college level.

Key Points

• According to NEP 2020, Children from 3 to 18 years old will have access to a free and compulsory high-quality education.
• This implies that all children between the ages of 3 and 18 will be entitled to receive a quality education from the government, regardless of their socioeconomic status.
• Everyone has access to get-quality education for all children from the age of 3-18 years instead of 6-14 years as per the RTE 2009.

 Therefore, the Arrangement of free and compulsory education for 3-18-year-old students are the changes required to be made in RTE 2009 as per NEP 2020.

Additional Information

• Right to Education Act (RTE) provided free and compulsory education to children between the age group of 6-14 years in 2009 and enforced it as a fundamental right under Article 21-A.
• India became one of 135 countries to make education a fundamental right of every child when the Act came into force on 1 April 2010.

All the statements are correct. Black board is a primary teaching aid in a classroom. It makes the subject interesting for pupils. It also simplifies the tough topics and keeps the pace of the lecture moderate as it encourages writing while talking and hence making teaching effective.

NEP 2020 encourages private investment in school infrastructure development to improve facilities and resources.

Microsoft and OpenAI are jointly embarking on a $100 billion project to create “Stargate,” an AI supercomputer. Scheduled for launch in 2028, it follows OpenAI’s AI upgrade in 2022. The project aims to surpass existing data centers’ capabilities by 100 times. Divided into five phases, with Stargate as the fifth, a smaller fourth-phase supercomputer is slated for release in 2026. Significant costs will be allocated to acquiring essential AI chips.

Around 71 for each penny of Earth is secured with water. Earth is the main planet where water can exist in fluid structure.

The tradition of bee-keeping in Bihar is very old. The period of October to December is considered as the best to start bee-keeping because at that time number of flowering and crop plants is more. So bees will get nectar and pollen easily to increase the production of honey. There was a setback to the bee-keeping industry in the 1980s due to the disease caused by the Thai sacbrood virus.
Hence, the correct answer is, 'October to December.'

Hence, Option B is correct.