Bihar STET Paper 2 Physics Mock Test - 10 - Bihar PGT/TGT/PRT MCQ

The magnetic susceptibility of diamagnetic materials doesn’t depend upon temperature. This is often because there’s an outsized barrier between the bottom state and therefore the excited states of diamagnetic substances. Hence, it remains constant during the change of temperature. All the other statements are false.

Explanation:Kinetic theory explains the behaviour of gases based on the idea that the gas consists of rapidly moving atoms or molecules. It also relates measurable properties of gases such as viscosity, conduction and diffusion with molecular parameters, yielding estimates of molecular sizes and masses.

Since, P_r​=P_b​ 
r for red and b for blue.
P_r​=P_b​
or, n_r​× (hc/λr)  ​=nb​× (hc​/λ_b)​
or,  ​(n_r/n_b)​​= λ_r​​/λ_b ​
Since, the wavelength of red bulb is greater than the wavelength of blue bulb.
or,  n_r​>n_b

An atom has a nearly continuous mass distribution in Thomson’s model, but has a highly non-uniform mass distribution in Rutherford’s model.

If the distance of a point charge, kept on the axis of a dipole, is sufficiently large than the separation between the charges of a dipole, then it can be shown that electric field E at a distance r from the dipole varies as E α 1/r³. Now if the distance becomes 2r, electric field intensity will decrease by a factor of 2³=8 times. Therefore the force F will now become F/8.

L =0.14
E=100sin(100t)
⇒X_L​=w_L​=100×0.1
=10Ω
⇒i_o​=E_o/XL​=100/10​=10A
⇒i=i_o​sin(100t− π/2​)
⇒i=−i_o​sin[(π/2)​−100]
So we get
⇒i=−10cos(100t)A
therefore, option D is correct.

Since ω is constant, v would also be constant.
So, no net force or torque is acting on ring. The force experienced by any particle is only along radial direction, or we can say the centripetal force.

The force experienced by inner part, F1 = mω²R₁ and the force experienced by outer part, 

We know that,       g = G. m₁ m₂ / r₂
Where we know g has dimensions of acceleration
Thus [G] = [ g.r² /m₁ m₂]
= N m²kg^-2

We know that R=ρ l/a

Where l is the length of the conductor through which the current flows and a is the area of cross section.

Here l = L and a = L × t

∴ R is independent of L

Here,
Aperture, a = 4 mm = 4 × 10-3 m
Wavelength, λ = 400 nm = 400 × 10-9 m = 4 × 10-7 m 

Ray optics is good approximation upto distances equal to Fresnel's distance (ZF).
Fresnel's distance is given by,

Explanation:The induced EMF is expected to be constant in the case of a rectangular loop. In case of a circular loop, the rate of change of area of the loop during the passage out of the field region is not constant, whereas it is constant for rectangular loop.

As there is no horizontal acceleration is present in oblique projection horizontal component of velocity is constant

Torque on a dipole kept in external electric field is given by the expression,

Like most stars, the sun is made up mostly of hydrogen and helium atoms in a plasma state. The sun generates energy from a process called nuclear fusion. During nuclear fusion, the high pressure and temperature in the sun's core cause nuclei to separate from their electrons.

Derived units are units which may be expressed in terms of base units by means of mathematical symbols of multiplication and division.
Example: the SI derived unit of area is the square metre (m^{​​​​​​2}), and the SI derived unit of density is the kilogram per cubic metre (kg/m³ or kg m^{​​​​​​-3}).

The names of SI units are written in lowercase.

The Davisson-Germer experiment demonstrated the wave nature of the electron, confirming the earlier hypothesis of deBroglie. Putting wave-particle duality on a firm experimental footing, it represented a major step forward in the development of quantum mechanics. The Bragg law for diffraction had been applied to x-ray diffraction, but this was the first application to particle waves.

Explanation:Vector addition is the operation of adding two or more vectors together into a vector sum. The so-called parallelogram law gives the rule for vector addition of two or more vectors. For two vectors, the vector sum is obtained by placing them head to tail and drawing the vector from the free tail to the free head.

NOTE : If we take individual length for the purpose of calculating the magnetic field in a 3-Dimensional figure then it will be difficult.
Here a smart choice is divide the loop into two loops.
One loop is ADEFA in y-z plane and the other loop will be ABCDA in the x – y plane.

We actually do not have any current in the segment AD. By choosing the loops we find that in one loop we have to take current from A to D and in the other one from D to A. Hence these two cancel out the effect of each other as far as creating magnetic field at the concerned point P is considered.
The point (a, 0, a) is in the X-Z plane.
The magnetic field due to current in ABCDA will be in + ve Z-direction.

NOTE : Due to symmetry the y-components and xcomponents will cancel out each other.
Similarly the magnetic field due to current in ADEFA will be  in x-direction.

∴ The resultant magnetic field will be

'u' should be the least distance of distinct vision.
U=-25cm
V=-50
(1/f)=(1/v)-(1/u)
=(-1/50) + (1/25)
=1/50
F=50cm
Hence a convex lens of focal length 50cm should be used.
 

Hence 1.6 mm upper, 1.0 mm lower is correct.

Given, u=−20cm
m=−3⇒−v/u ​=−3
v=−60cm
1/f=(1/v​)+(1/u)​=(-1/60)​−(1/20)​=−1−3/60​
f=−60/4​=−15cm
 

Flannel boards can be used to foster creativity and imagination power of the students. These boards can be used to display creativity of the students. They also provide a better opportunity to develop lessons.

A learner-centered approach places the learner at the center of the learning process, emphasizing active engagement and personalized learning.

Key Points

• Activity-based scaffolding is an approach to teaching that involves breaking down complex tasks into smaller, more manageable parts and providing support as needed to help students develop the skills they need to complete those tasks independently.
• Activity-based scaffolding is particularly effective for helping students develop complex skills and knowledge.

Thus, it is based on  is based on the learner-centered approach of Education.

Additional Information

• Lecturing-demonstration is a teaching method in which the teacher presents information to the students, often using visual aids or hands-on demonstrations.
• Joyful method is not a commonly used term in education, but it may refer to teaching methods that emphasize fun and engagement in the learning process.
• Inductive method is a teaching method that involves presenting specific examples and then drawing general conclusions based on those examples.

The child with Special Need: Also known as a specially-abled child, a child with special needs is the one who needs special attention and requires necessities that other children do not. There are many types of special needs one of which is for visually impaired children.

• A visually challenged child is the one who has a problem seeing with the naked eyes or is not able to see completely.

Important Points

Instruction adaptations that a teacher can follow while working with students who are ‘visually challenged’ are:

• Should speak clearly and audibly to help them learn through listening or auditory learning
• Use a lot of touches and feel materials.
  • Make use of material adaptations according to the individual needs, the actual degree of functional vision, presence of any other disabilities
  • Using a variety of tactile materials like rough or smooth, cold or hot, wet or dry, vibrate or stationary helps the students to touch, feel, and understand the differences between the materials
• Break the entire learning process into smaller units
• Provide ample time for the challenged learner to learn in his/her own way
• Provide support and independence wherever necessary
• Braille, tactile symbols, large prints, recorded materials, etc. can be used as teaching aids for visually challenged learners
• A touch and feel tool for the visually challenged person

Hence, we can conclude that a teacher should speak clearly and use a lot of touches and feel materials while working with students who are ‘Visually Challenged’.

Activity-based learning is a ‘learner-centred’ approach in the teaching-learning process. In this approach, the ‘learner’ or ‘child’ and not the ‘teacher’ is the main focus of the educational program. It emphasizes ‘learning’ rather than ‘teaching’.

• Activity-based learning integrates multiple methods of teaching like Demonstration, Role-play, Brainstorming, Project method, Debate, etc.
• Activity-based learning brings the real issues and problems from day-to-day life in classroom settings.
• It provide provides opportunities to apply multiple senses.
• It includes all objects, events, natural phenomena and social surroundings in the teaching-learning process.
• It clarifies abstract concepts, develops concrete thinking and brings reality in real settings.
• During activity-based learning, the learners use his/her multiple senses to understand the concepts and enhance learning.
• It arouses the child’s interests, abilities, and needs during the learning process.

Hence, we conclude that all the above points are the advantages of the activity-based learning.

• Kesavananda Bharati Case is a landmark case where the Supreme Court defined the basic structure of the Indian Constitution. The judgement for this case was delivered on April 24, 1973.
• The case is also known as the Fundamental Rights Case. The Supreme Court asserted its right to strike down amendments to the constitution that were in violation of the fundamental architecture of the constitution.

Alcohol = 40% of 120 = 48

Hence, Option C is correct.