Bihar PGT Chemistry Mock Test - 3 - Bihar PGT/TGT/PRT MCQ

'A house divided against itself cannot stand' means if there is no unity within an organization or group nothing can be achieved.

Option 3 states this meaning and is the correct option. All other options imply other ideas.

Example- The management never made peace with the players, hence there was complete chaos, and the team eventually lost. Truly a house divided against itself cannot stand in the long run.

The options don't have a simple past tense alternative. The sentence seems to state that the team had arrived a day prior to the day of this conversation. The sentence goes absolutely fine in the past perfect tense as the presence of the word 'yesterday' shows that an activity has been completed in the past. 

Rumble means a heavy sound that reverberates. Roar is the only option that is quite similar in meaning. Thus, option 4 is correct.
Example- The roar of the ocean could be heard before the cyclone struck.

The passage says that the group of boys went out for a movie on Friday night. They were catching up after a long time. The friendship they had seemed to remain intact though. After going to the movie, the boys went for dinner too.
This sequence of events is shown only by option 3. Hence, it is the correct answer.

The correct answer is Khwaja Moinuddin Chishti.

Key Points

• Khwaja Moinuddin Chishti came to India in 1192 CE and afterwards, he started the Sufi sect in India.
• After visiting many places in India, he settled permanently in Ajmer.
• The tomb of Khwaja Moinuddin Chishti in Ajmer is known as Ajmer Sharif’.
• His disciples or devotees recall him by the names of ‘Khwaja Sahib’ or ‘Garib Nawaz’.
• Chishti sect considers music as the important source of displaying love for God. 

Thus, we can conclude that the Sufi sect was started by Khwaja Moinuddin Chishti.

Additional Information

• Baba Farid was a Sunni Muslim and was one of the founding fathers of the Chishti Sufi order.
• Shaikh Nuruddin, also known as Nund Rishi was a Kashmiri Sufi saint, mystic, poet and Islamic preacher. Nund Reshi was among the founders of the Rishi order, a Sufi tradition of the region.
• Amir Khusro was an Indo-Persian Sufi singer, musician, poet and scholar who lived under the Delhi Sultanate. He was an iconic figure in the cultural history of the Indian subcontinent.

The correct answer is Magnesium.

Key Points

• The outermost shell of a Magnesium element has two electrons.
  • 12 is the atomic mass for magnesium.
  • it is in group 2 of the periodic table, which it loses,
  • so it can attain stability by losing the electron and its outermost shell will be complete by achieving (2,8) configuration 
  • it has a charge of +2, as it still has 12 protons (positive charges) and now has only 10 electrons (negative charges).
  • Magnesium is used in products that benefit from being lightweight, such as car seats, luggage, laptops, cameras, and power tools.
  • It is also added to molten iron and steel to remove sulfur. 
• Outermost Shell :
  • This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.
  • In general, atoms are most stable, least reactive, when their outermost electron shell is full.

Additional Information

• Carbon is a chemical element with the symbol C and atomic number 6.
  • It is nonmetallic and tetravalent-making four electrons available to form covalent chemical bonds.
  • It belongs to group 14 of the periodic table. 
  • Carbon typically shares electrons to achieve a complete valence shell, forming bonds with multiple other atoms.
• Boron is a chemical element with the symbol B and atomic number 5.
  • The boron atom has only six electrons in its outer shell, leading to an electron deficiency.
  • This molecule has 12 valence shell electrons, 3 each from the B atoms, and 1 each from the six H atoms.
    • Electrons per shell: 2,3
    • Atomic Mass: 10.811 g/mol
• Chlorine atom consists of 17 protons (positively charged sub-atomic particles) in the atom's nucleus (central region), balanced by seventeen electrons (negatively charged sub-atomic particles) distributed around the nucleus.

The correct answer is Femur.

Key Points

• The largest bone in the human body is the femur, the thighbone.
• It is the largest, longest, and strongest bone in the human body.
• The shortest bone in the human body is the stapes or stirrup bone in the middle ear.
• The femur runs from the keen to the hip.
• The Femur or thigh bone is the largest and heaviest bone in the human body.
• At the proximal end of the Femur, there is a rounded prominence which is called the Head of the Femur.
• The femur runs from the keen to the hip.
• It carries all the upper body weight.
• The other parts of the leg are the tibia, femur, fibula, and keep cap also known as patella.

Additional Information

• The human skeleton is made up of 206 bones, including bones of the
  • Skull:  including the jaw bone (mandible, maxilla)
  • Spine: cervical, thoracic and lumbar vertebrae, sacrum and tailbone (coccyx)
  • Chest: ribs and breastbone (sternum)
  • Arms: the shoulder blade (scapula), collar bone (clavicle), radius, humerus and ulna
  • Hands: wrist bones (carpals), metacarpals and phalanges
  • Pelvis: hip bones
  • Legs: the thigh bone (femur), the kneecap (patella), shin bone (tibia) and fibula
  • Feet: tarsals, metatarsals, and phalanges.

The correct answer is Ethyl mercaptan.

Key Points

• The stench due to leakage from the LPG cylinder because of Ethyl mercaptan.
  • LPG gas is basically propane and butane.
  • It is odourless in its natural state.
  • The smell that you notice when there is a leak is actually the stench of an entirely different agent, called ethyl mercaptan​.
    • This substance is added to the gas when it leaves the main storage terminals.
• Hence, option 4 is correct.

• Methane :
  • Methane is a chemical compound with the chemical formula CH₄.
  • Methane is a one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms
  • It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.
  • It is a colourless, odourless, non-toxic but flammable gas.
  • It has a role as a fossil fuel, a member of greenhouse gas, and a bacterial metabolite.
• Butane :
  • Butane or n-butane is an alkane with the formula C₄H₁₀.
  • Butane is a gas at room temperature and atmospheric pressure.
  • Butane is a highly flammable, colourless, easily liquefied gas that quickly vaporizes at room temperature.
  • Butane is a hydrocarbon and a highly flammable, colourless, odourless, easily liquefied gas.
  • It is typically used as fuel for cigarette lighters and portable stoves, a propellant in aerosols, a heating fuel, a refrigerant.
• Propane :
  • Propane is a three-carbon alkane with the molecular formula C₃H₈.
  • It is a gas at standard temperature and pressure, but compressible to a transportable liquid. 
  • Propane is a flammable hydrocarbon gas that is liquefied through pressurization and commonly used for fuel in heating, cooling, hot water, and vehicles.
  • Propane can also be used for refrigerants, aerosol propellants, and petrochemical feedstock.​ 

P, Q, R, S, T, V, W, and Z are sitting around a circle facing at the centre not necessarily in this same order.

i) T is second to the right of R who is third to the right of P.

Mistake Points

Who is used for the second person in a connecting statement.

For example: 

T is second to the right of R who is third to the right of P.

Here, who is used for R and not for T.

ii) S is second to the left of P and fourth to the right of Q.

iii) V who is not an immediate neighbour of P. (This means V cannot sit immediate left or right of P).

iv) Z is third to the right of V 

Thus we can see R is second to the right of W

Hence, the correct answer is "Option 1".

The correct answer is 2009.

Key Points

• The 86th amendment to the constitution of India in 2002, provided the Right to Education as a fundamental right in part-III of the Constitution.
• The first official document on the Right to Education was Ramamurti Committee Report in 1990.
• Tapas Majumdar Committee (1999) was set up, which encompassed the insertion of Article 21A.
• The Right to Education serves as a building block to ensure that every child has his or her right to get a quality elementary education.

Important Points

• Features of Right to Education (RTE) Act, 2009 -
  • The RTE Act aims to provide primary education to all children aged 6 to 14 years.
  • It enforces Education as a Fundamental Right (Article 21).
  • The act mandates 25% reservation for disadvantaged sections of the society.
  • It had a clause for “No Detention Policy” which has been removed under The Right of Children to Free and Compulsory Education (Amendment) Act, 2019.
  • It also states that sharing of financial and other responsibilities between the Central and State Governments.

Additional Information

• Some important 'Parts' of the Indian Constitution:
  • Part 2 - Citizenship
  • Part 3 - Fundamental Rights
  • Part 4 - Directive Principles of State Policy
  • Part 4A - Fundamental Duties
  • Part 14 - UPSC and SPSC.
  • Part 15 - Election Commission
  • Part 17 - Official language
  • Part 20 - Amendment of Constitution

Volume of resulting solution = 100 ml

With increase in temperature molecular collisions increases therefore rate of reaction doubles.

∆S = nCplnT₂/T₁ + nRlnP₁/P₂
Since pressure is constant, so the second term will be zero.
Or ∆S = 3×7/2×8.314×2.303×log(1000/400)
= 80.42 JK^-1

If FeCl₃ is added to excess of hot water, a positively charged sol of hydrated ferric oxide is formed due to adsorption of Fe³⁺ ions.
Ferric hydroxide is a negative sol,FeCl₃ electrolyte will coagulate the most.

When zinc is placed in copper nitrate solution the intensity of the blue colour is produced and copper iron is deposited on zinc.

• This is a Redox reaction between zinc and an aqueous solution of copper nitrate occurring in a beaker.

Unleaded paint and petrol were introduced because lead affect the brain and cause mental impairment

Ka = 1.8 × 10^–5
CH₃COO^– + H₂O  CH₃COOH + OH^-
Given reaction is reverse of above

(a) 2s (b) 2 p (c) 3d (d) 3d
Thus, (c) and (d), both 3d, have equal energy.

• There are a total of 7 periods in the periodic table.
• The sixth period of the periodic table contains 32 elements.
• It is beginning with cesium and ends with radon.
• Lead (Pb) is currently the last stable element whereas all subsequent elements are radioactive.

This is an example of E1 reaction and more substituted alkene (I) is formed as the major product.

Global warming will not increasing the size of the hole in the ozone layer

Valence bond theory was introduced by Heitler and London (1927) and further work was done by Pauling and others.

In the valence bond (VB) theory, proposed in large part by the American scientists Linus Pauling and John C. Slater, bonding is accounted for in terms of hybridized orbitals of the metal ion, which is assumed to possess a particular number of vacant orbitals available for coordinate bonding that equals its coordination number. 

Tertiary halide would be most reactive in S_N1 reaction.

Most of the f block elements, lanthanoids and actinoids are man made/synthetic/prepared in the lab. Especially actinoids.

The angular momentum (mvr) of electron in nth orbit is equal to nh/2π
For the electron in 5th orbit