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53. Options (iii) and (iv) are correct since in anti-ferromagnetic substances the magnetic moments and domains are oppositely oriented, and they cancel out each other's magnetic moment. For example,   the anti-ferromagnetic substance-MnO.

52. Option (iii) and (iv) are correct since tetrahedral voids are formed when the triangular void in the second layer lie exactly above the triangular voids in the first layer and the triangular shape of these voids oppositely overlap while the octahedral voids are formed when triangular void of second layer is not exactly overlap with similar void in first layer. This can be shown as-

Maya Academy of Advanced Cinematics, Raipur applications are currently open for all the courses. Candidates can enroll for the preferred course by filling out a form on the academy's website. Applicants can also schedule a demo class for them. The academy has not specified any application deadline for now. However, aspirants must apply as soon as possible to avoid missing out the chance

51. Option (i)? metals >>? insulators < ? semiconductors is correct since metals are the ones which shows the highest conductivity due to the presence of free electrons in them which helps in the conduction of electricity while semiconductors are the ones whose conductivity depends upon the temperature.

Since at normal temperatures, they act as insulators whereas if the temperature rises, the conductivity of the semiconductor also increases. Insulators are the ones which do not have free electrons in them. Due to which they act as poor conductors and hence their conductivity is the lowest.

Candidates can fill out the form to enroll in a course online. Aspirants have to visit the official website of Maya Academy of Advanced Cinematics, Raipur to apply for the preferred course. Below are the steps:

Step 1: Visit the official website of MAAC Raipur.

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50. Option (i) $\sqrt[2]{2r}$ , $\frac{4r}{\surd 3}$  ,2r

In FCC crystal - the atoms touch each other at the face diagonals. If a is the edge length of the cube and r is the radius of the atom 

Therefore, $\sqrt[]{2a}=4r$

a = $\frac{4r}{\surd 3}$

In a simple cubic crystal - The atoms at the corners touch each other.

Therefore, a = 2r

Yes, FIIB Delhi FPM admissions 2025 are open. The institute is currently accepting online applications for admissions to the FPM and EFPM courses for the academic year 2025-26. Interested candidates can apply through the institute's official website. Before applying, they must ensure that they meet the eligibility requirements specified by the institute for FPM admissions. They must separately apply for at least one of the accepted entrance exams. For more information, candidates must visit the institute's official website.

49. Option (iv) 8 tetrahedral voids within the unit cells is correct since in ccp structure there are 4 atoms per unit cell and the number of tetrahedral voids is twice the number of atoms (i.e. eight tetrahedral voids per unit cell of cubic close packing.

48. Option (i) Frenkel defect is correct since in this defect an atom is displaced from its lattice point to an interstitial site thus creating a vacancy at the lattice point. This usually occurs in those ionic crystals where the size of anion is quite large as compared to that of the cation. Here dislocation of atoms occurs and hence it is known as dislocation defect.

Since, admissions are merit-based at Maya Academy of Advanced Cinematics, Raipur, candidates can get direct admission based on their qualifying exam scores. Aspirants need to complete Class 12 to get admission in any of the certificate courses offered by the academy. Once selected, candidates have to confirm their seat by paying the course fee.

The requirement for admission into the Government Engineer Vishwesarraiya Post Graduate College BA course is that students mut have passed class 12 exams successfully. The spectrum of subjects offered for the BA course is wide and students can choose as per their interest. Apart from the core subject the students can choose the electives as well. 

47. Option (ii) The correct order of the packing efficiency is fcc > bcc > simple cubic

Packing Efficiency (fcc) - 74% 

Packing Efficiency (bcc) - 68% 

Packing Efficiency (simple cubic) - 52% 

Candidates who meet the above mentioned eligibility and selection criteria are eligible to participate in the admission process to secure a seat in the university. 

Maya Academy of Advanced Cinematics, Raipur offers seats to candidates in certificate courses based on their merit. The academy considers the qualifying exam scores of the aspirants for admission. The basic qualification required for admission is Class 12. Aspirants only need to fill out the form and pay the course fee to join the institute.

46. Option (i) all the domains get oriented in the direction of magnetic field is correct since whenever a ferromagnetic substance is placed in a magnetic field it becomes a permanent magnet as all the domains get oriented in the directions of the magnetic field even after removal of  the applied magnetic field.

45. Option (iv) The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids is not true since the occupation of the voids depends upon the stoichiometry of the compound instead of the radii of the ions. 

44. Option (ii) Ferromagnetic substances cannot be magnetised permanently is correct since ferromagnetic substances are those which are very strongly attracted by the magnetic field and can be magnetized permanently.

Yes, candidates can join Maya Academy of Advanced Cinematics without any entrance exam scores. Since, the selection is merit-based, aspirants only have to meet the eligibility requirements for admission. Candidates do not require passing any national, state or college-level entrance exams for a seat in the academy.