Monthly Mock Test (April 30) - NEET MCQ

Hence empirical formula =CH₃

Additional Information: An empirical formula represents the simplest whole-number ratio of various atoms present in a compound, whereas, the molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

, so, dimensions are [LTT^–1].

2H₂ ​+ O₂​ → 2H_2​O

10 g of hydrogen (molar mass 2 g/mol) = 2 g/mol  10 g ​= 5 mol 

64 of oxygen  (molar mass 32 g/mol) = 32 g/mol  64 g ​= 2 mol 

As per the balanced chemical equation, 1 mole of oxygen will react with 2 moles of hydrogen to form 2 moles of water.

Here, oxygen is the limiting reagent and hydrogen is the excess reagent.

Hence the amount of H₂O produced depends on the amount of O₂ taken
0.5 mole of O₂ gives H₂O = 1 mol
∴ 2 mole of O₂ gives H₂O = 4 mol

Writing the equation of  combustion of propane (C₃H₈), we get

From the above equation we find that we need 5 L of oxygen at NTP to completely burn 1 L of propane at N.T.P.
If we change the conditions for both the gases from N.T.P. to same conditions of temperature and pressure. The same results are obtained. i.e. 5 L is the correct answer.

Genera like Selaginella and Salvinia which produce two kind of spores, macro (large) and small (micro) spores are known as heterosporous. Microspore and macrospore germinate and gives rise to male and female gametophyte respectively. The female gametophytes in these plants are retained on the parent sporophyte for variable period. The development of zygote into young embryo takes place within the female gametophytes. This event is a precursor to the seed habits considered as an important step in evolution.
So, the correct answer is 'Embryo develops in female gametophyte which is retained on parent sporophyte'

∴  dimension of G is  

= M^–1L³T^–2

Percentage error in mass 

percentage error in speed 

Kinetic energy 

∴ Error in measurement of kinetic energy

By Binomial Function ,

 Reqd. error

∴ %age error = 8%.

Archegoniophore is the female sex organ of bryophytes (Marchantia) and pteridophytes. Its neck region is made up of 4-6 vertical rows of cells.

• Metabolism is the process by which all living things assimilate energy and use it for various purposes such as growth, movement, locomotion etc. This mechanism of metabolism is not shown by nonliving objects. However, some of the metabolic reactions can be carried out in a cell-free system or outside the cells. Isolated metabolic reactions in vitro are not living things but are living reactions. Hence, statement A is incorrect.
• All living organisms show growth either by multiplication or by an increase in size. It is an irreversible increase in the mass of individual from inside. Two types of substances are produced by the cells, apoplastic and protoplastic. Apoplastic substances are nonliving materials formed by the cells which become components of tissues. For example, cell wall, the matrix of bone etc. Protoplastic substances are the components of living matter like cytoplasm and nucleus.
• Although some nonliving things like mountains, sand mounds, crystals also grow, their growth is due to the addition of matter from outside.

Hence, statements B and D are incorrect.

• All organisms respond to external stimuli which can be physical, chemical or biological. This is called irritability. Stimuli are perceived by sense organs in animals but plants can respond to external factors like water, temperature, light etc. All organisms from prokaryote to the most complex eukaryotes can sense and respond to environmental events.

Hence, statement C is correct.

So, the correct answer is 'Perception of events happening in the environment and their memory'.

Millimoles of solution of chloride = 0.05 × 10 = 0.5
Millimoles of AgNO₃ solution = 10 × 0.1 = 1
So, the millimoles of AgNO₃ are double than the chloride solution

The balanced chemical equation is:

From the equation, it is clear that 2 moles of MnO₄^–  are required to oxidize 5 moles of SO₃^–2  

2/5 mole of MnO₄^– is required to oxidize 1 mole of SO₃^–2 

• Binomial nomenclature (also called binomial nomenclature or binary nomenclature) is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, although they can be based on words from other languages.

Penguin, Kiwi & Ostrich all belong to class Aves of chordata (i.e. birds) and they do not give birth to their young ones, they are oviparous while Kangaroo, Hedgehog, Dolphin, Loris all belong to class mammalia and are viviparous.

Fungi lack chlorophyll, hence, they do not prepare their food by photosynthesis. They can grow where organic material is available. So, they are heterotrophs that acquire their nutrient by absorption and store in the form of glycogen.

2Al₂O₃ + 3C → Al₃CO₂

Gram equivalent  of Al₂O₃ = Gram equivalent of C

Equivalent weight of Al 

Equivalent weight of C

No. of gram equivalent of Al  = = 30 × 10³
Hence, No. of gram equivalent of C = 30 × 10³

Again, No. of gram equivalent of C
⇒  mass = 90 × 10³ g = 90 kg

In Cycas (gymnosperm) the seed does not occur inside a fruit but lies naked  or exposed on the surface of megasporophyll.

Virus envelope is known as capsid. The capsid is composed of protein subunits called capsomere.

[Pressure] = [Force] / [Area]

= ML^–1T^–2

• Biosystematics is the study of biological diversity and its origins. It focuses on understanding evolutionary relationships among organisms, species, higher taxa or other biological entities, such as genes and the evolution of the properties of taxa including intrinsic traits, ecological interactions, and geographic distributions.
• An important part of systematics is the development of methods for various aspects of phylogenetic inference and biological nomenclature.
• Whereas morphological characteristics ( physical appearance) and cytological characteristics ( size of cell and nucleus) are not used for systematics.

Average isotopic mass of,

= 199.96 amu ≈200 amu

Ulothrix is a green alga. Spirogyra is a filamentous green alga. In Rhizopus the columella bears the spores for asexual reproduction

Echinoderms show bilateral  symmetry  in their larval stage and pentamerous radial symmetry in the adult stage. Annelids are bilaterally symmetrical, coelenterates show radial symmetry.  Molluscs are also bilaterally symmetrical.

⇒ unit of ε_o is (coulomb)²/ newton -metre²

Gametic meiosis is found in all animals.  In sporic meiosis the sporophyte produces sporangia where meiosis occurs producing haploid spores.

Dimension of  a. t = dimension of velocity a . t = LT^-1 ⇒ a = LT^-2
Dimension of c = dimension of t (two physical quantity of same dimension can only be added)

So, dimension of c = T

Dimension of   = Dimension of v

So, answer is LT^–2, L & T

Crocodile belongs to reptilia class which has four chambered heart. Lemur teeth are combedded in the sockets of two which is known as thecodont.

1 mol of triatomic gas has 3 ×6.02×10²³ atoms

Therefore, no. of atoms in 0.1 mol =0.1×  3 ×6.02×10²³ = 1.806×10²³

In p = p₀ exp (–αt²), αt² dimension less

Lampreys and hagfishes are unusual, jawless fish that comprise the order Cyclostomata, so named because of the circular shape of the mouth. The brains of lampreys and hagfishes differ a lot, but they also show a large number of similarities, as do all craniate brains.