NVS PGT Chemistry Mock Test - 7 - NVS TGT/PGT MCQ

 The correct answer is Humus.​

Key Points

• Humus is a dark, organic matter that forms in soil when a plant or living matter decays. 
• Humus is formed by the decomposing action of soil microorganisms (e.g., bacteria and fungi), which break down animal and vegetable material into elements that can be used by growing plants. 
• Humus is an important biological constituent of fertile soil.
• It contains many useful nutrients for healthy soil. One of the most important is nitrogen. Nitrogen is a key nutrient for most plants. 
• Agriculture depends on nitrogen and other nutrients found in humus.
• When humus is in soil, the soil will crumble, and water moves easily through the loose soil so that oxygen can reach the roots of plants.
• When people compost, they collect decaying organic material, such as food and garden scraps, that turned into soil, It produces Humus in soil.

Key Points

Rock cycle:​​

• Rocks do not remain in their original form for a long period.
• They undergo a transformation.
• This cycle is an uninterrupted process through which old rocks are converted into new ones.
• Igneous rocks are primary rocks.
• These rocks can be changed into metamorphic rocks.
• Sedimentary and metamorphic rocks are formed from these primary rocks.
• The fragments evolved out of metamorphic rocks and igneous again form into sedimentary rocks.
• Sedimentary rocks themselves can develop into fragments.
• The crustal rocks -igneous, metamorphic, and sedimentary-once formed may be carried down into the interior of the Earth through subduction.
• In this process, parts or entire crustal plates subduct under another plate and the same melt at high temperatures in the interior.
• This results in the formation of molten magma, the unique source for igneous rocks.
• The process of transformation follows the steps,  'Igneous rocks - sediment - sedimentary rocks - metamorphic rocks - magma'​ 
• The image below clearly explains the rock cycle.

Hence, rock cycle is the process of transformation of rock from one to another

The logic follows here is:

Middle number = square root of first number + third number.

Row-wise operation :

(25, 41, 36)

middle number = 41

= √25 + 36

= 5 + 36

= 41

(49, 45, 38)

middle number = 45

= √49 + 38

= 7 + 38

= 45

Similarly

(36, ?, 62)

middle number = ?

= √36 + 62

= 6 + 62

= 68

Hence, the correct answer is "68"

Additional Information

The most common pattern asked in exams are based on:

• It could be the sum of two numbers divided by a constant
• It could be the average of numbers.
• It could be in the form of alphabets, where alphabets are increased by constant or increased by the square of numbers or increased by prime numbers.
• It could be the difference of product of two diametrically opposite numbers.
• It could be the difference in the sum of adjacent numbers.
• The difference of the numbers could be in the patterns 13 ± 1, 23 ± 1,  and so on.
• The difference of the numbers could be in the patterns 12 ± 1, 22 ± 1, and so on.
• Numbers could be 12, 22, 32, and so on or 13, 23, 33, and so on.
• The difference could be prime numbers or the difference could be the square of prime numbers.
• The difference could be in the form of N2 ± N or N3 ± N.
• The difference could be in the form of ×N + N or ×2 + 1, ×2 + 2, ×2 + 3, and so on.
• The difference could be in the form of ×2 ± 1 alternatively.
• Numbers could be ×1, ×2, ×3, and so on. 

Let the number be x.

According to the question,

⇒ 80% of x - 80 = 80

⇒ 80% of x = 80 + 80

⇒ (80/100)x = 160

⇒ 80x = 160 × 100

⇒ x = 16000/80

⇒ x = 200

Hence, the correct answer is "200".

Given number -        8 3 7 9 1 2

Descending order -  9 8 7 3 2 1

Hence, the position of only one digit, i.e. 7 remains unchanged.

Students feel humiliated being criticised by a teacher in front of their peers. So, handling discipline issues without an audience allows for better, more genuine exchanges, since the student responses will not be witnessed by classmates.

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.

Liquid in liquid sols are emulsions

Non-reducing sugars do not have an OH group attached to the anomeric carbon so they cannot reduce other compounds. All monosaccharides such as glucose are reducing sugars. A disaccharide can be a reducing sugar or a non-reducing sugar. Maltose and lactose are reducing sugars, while sucrose is a non-reducing sugar.

According to Aufbau rule electrons are filled in increasing order of energy.

The correct order of bond dissociation enthalpy is

NH₂ has lp of electron which reacts with AlCl₃ or other catalyst that we add to form anilium ion.

The correct answer is B.

Statement I:
cis-2-Butene on reaction with cold dilute KMnO4,
the solution produces meso2,3butanediol.
It is a dihydroxylation reaction and two -OH groups are added across the C=C bond.

Statement II:
2KMnO₄ + H₂O + KI → 2MnO₂ + 2KOH + KIO₃
​
I + 6OH⁻→ IO₃− + 3H2O + 6e⁻
When alkaline KMnO4 is treated with KI, I−
is oxidised to IO₃⁻
But, Statement II is not the correct explanation of Statement I.

Langmuir isotherm assume monolayer formation only.

The physical properties of isotopes of the same element are not identical because the atomic mass and mass number differ. This affects physical properties such as density and temperature of change of state, eg. boiling and melting point.

PCl₅ dissociation a closed container

The correct answer is option A
Reduction with LiAlH₄

 

Maleic Acid shows Geometrical Isomerism but does not give optical isomerism.

Theory of Multiple Intelligence which describes eight different kinds of intelligence is propounded by an American cognitive psychologist 'Howard Gardner'.

The rosenmund reaction is catalyzed by palladium on barium sulfate. Barium sulfate reduces the activity of palladium due to its low surface area meaning it decreases the reducing power of palladium in order to prevent over-reduction of the acid.

The sentence seems to mean that the authorities apologized for the trouble it caused to passengers. Hence, the correct word to be used is 'inconvenience' and not 'inconsistency'.
Inconvenience means to cause trouble or problems whereas inconsistent means not to be regular.
Hence, the correct option is 2.

The sentence is predicting that the person concerned will not be able to attend a function the next day. Hence, it should be in the simple future tense.
As desired all the features are present in the given statement and it is grammatically correct too. 
The phrase 'to make it to ___' means to come somewhere. You use this to talk about attending events or meeting people.
Option 4 is correct as no further improvement to the sentence is required. 

दिए गए विकल्पों में से विकल्प 3 "कोई नौकर" सही है। अन्य विकल्प सही नहीं हैं।

Key Points

• ऐसे सर्वनाम शब्द जो संज्ञा से पहले प्रयोग होकर उस संज्ञा शब्द की विशेषता बतलाते है, उन शब्दों को सार्वनामिक विशेषण कहते हैं।
  • जैसे:- कोई नौकर यहाँ से नहीं जाएगा।
• इस वाक्य से यह साफ हो जाता है कि कोई नौकर वाक्य सार्वनामिक विशेषण है।

Additional Information

इनमें से व्‍यक्तिवाचक संज्ञा नहीं है - 'पहाड़'

• यह शब्द किसी एक विशेष पहाड़ का बोध न कराकर दुनिया के सभी पहाड़ों का बोध करा रहा है। अतः पहाड़ एक जातिवाचक संज्ञा शब्द है।
  • जो शब्द किसी व्यक्ति, वस्तु या स्थान की संपूर्ण जाति का बोध कराते हैं, उन शब्दों को जातिवाचक संज्ञा कहते हैं।
• यानी, जातिवाचक संज्ञा शब्दों से एक जाति के अंतर्गत आने वाले सभी व्यक्तियों, वस्तुओं व स्थानों का बोध होता है।
  • जैसे- आदमी, जानवर, पशु, पक्षी, गाय, लड़का, शहर, बगीचा, नदी, पुस्तक, कार, ट्रक आदि।

Key Pointsजातिवाचक संज्ञा के कुछ उदाहरण:-

• बच्चे खिलौनों से खेल रहे हैं।
• पेड़ों पर पक्षी बैठे हैं।
• मनुष्य सबसे पुरानी प्रजातियों में से एक है।
• कुत्ता एक वफादार जानवर होता है।
• आज के समय में नदियों में बहुत अधिक प्रदुषण हो रहा है।

Additional Information