How to prepare for a Viva : We all agree that exams can be scary and stressful for most of us, especially the external Viva examinations!  To help ease your stress, we at Noon, wish to take you...

$$ \begin{array}{l} \hline \mathrm{FeO}+\mathrm{C} \longrightarrow \mathrm{Fe}+\mathrm{CO} \\ \mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2} \\...

Solution: A Solution is a homogeneous mixture of two or more chemically non-reacting substances. Types of solution: There are nine types of solution. Types of Solution Examples Gaseous solutions:...

Ans: One or more unpaired electrons occupy an anionic vacancy in a crystal in a crystallographic defect known as an F-center. FARBE center, or color center (from the German Farbzentrum). Vacancies...

(a) An octahedral void Ans: The coordination number for an octahedral void will be $6 .$ (b) A tetrahedral void Ans: The coordination number for a tetrahedral void will be $4 .$

Ans: $$ \begin{array}{l} \text { Let } P(x)=k^{2} x^{2}-2 k x-3 \\ P(1)=k^{2}(1)^{2}-2 k(1)-3 \\ \Rightarrow 0=k^{2}-2 k-3 \\ \Rightarrow k^{2}-3 k+k-3 \end{array}

Ans: Even natural no, divisible by 5 are $10,20,30, \ldots$ Here, $a=10, d=10, n=100$ Using the formula, $$ \begin{array}{l} S_{n}=\frac{n}{2}[2 a+(n-1) d] \\ S_{100}=\frac{100}{2}[2(10)+10(100-1)]...

Ans: Use the formula $a_{n}=a+(n-1) d$, Sum of odd terms: $$ \begin{array}{l} s_{1}=a_{1}+a_{3}+\ldots \ldots a_{2 n+1} \\ s_{1}=\frac{n+1}{2}\left[2 a_{1}+2 n d\right] \\ \therefore s_{1}=(n+1)(a+n...

Solution: In $\Delta \mathrm{DOC}$ and $\triangle \mathrm{BOA}$ $\mathrm{AB} \| \mathrm{CD}$, thus alternate interior angles will be equal, $\therefore \angle \mathrm{CDO}=\angle \mathrm{ABO}$...

Ans: $$ \Rightarrow x^{2}+\frac{3}{4} x+\left(\frac{3}{8}\right)^{2}=-\frac{5}{4}+\frac{9}{64} $$ $\Rightarrow\left(x+\frac{3}{8}\right)^{2}=-\frac{71}{64}$ $\Rightarrow...

Answer: First, draw a circle and connect two points $A$ and $B$ such that $A B$ becomes the diameter of the circle. Now, draw two tangents PQ and RS at points A and B respectively. Now, both radii...

Solution: (i) Given, in $\triangle \mathrm{ABC}, \mathrm{DE} \| \mathrm{BC}$ $\therefore \mathrm{AD} / \mathrm{DB}=\mathrm{AE} / \mathrm{EC}$ [Using Basic proportionality theorem] $\Rightarrow 1.5 /...

Correct option is A $\mathrm{M}^{\circ} \mathrm{L} \mathrm{T}$ We know that: Dimensional formula of $\mathrm{L}=\mathrm{ML}^{2} \mathrm{~T}^{-2} \mathrm{~A}^{-2}$ Dimensional formula for...

Correct option is D $\mathrm{P}^{1-\mathrm{T}^{7}}=$ constant From the first law of thermodynamics, $d U=d Q+d W$ But for adiabatic process, $\mathrm{dQ}=0$ $$ \begin{array}{l}...

Solution:- $\int \cos 2 x \cos 4 x \cos 6 x d x=\int \cos 2 x\left[\frac{1}{2}\{\cos (4 x+6 x)+\cos (4 x-6 x)\}\right] d x$ $=\frac{1}{2} \int\{\cos 2 x \cos 10 x+\cos 2 x \cos (-2 x)\} d x$ We know...

Solution: A binary operation $*$ on $N$ defined as $a * b=a^{3}+b^{3}$, Also, $a * b=a^{3}+b^{3}=b^{3}+a^{3}=b^{*} a$ The operation ${ }^{*}$ is commutative. Again, $(a * b)^{*}...

Solution: Consider the given vectors, Given, $\vec{a}+\vec{b}+\vec{c}=\overrightarrow{0}$. So, And, $$ \begin{array}{l} \vec{c} \cdot(\vec{a}+\vec{b}+\vec{c})=\vec{c} \cdot \overrightarrow{0} \\...

Solution: Let us take, $9-4 x^{2}=t$ We get, $-8 \mathrm{x} \mathrm{dx}=\mathrm{dt}$ Now take, $\int \frac{x}{9-4 x^{2}} d x$ https://byjus.com $B B Y J U^{\prime} S$ So, $$ =\frac{-1}{8}...

Solution: Given $$ \sin (a x+b) \cos (a x+b) $$ On integrating the above function, we get $$ \sin (a x+b) \cos (a x+b)=\frac{2 \sin (a x+b) \cos (a x+b)}{2} $$ We obtain, $$ =\frac{\sin 2(a x+b)}{2}...

Correct option is C fluorine Florine is the most powerful oxidizing agent because it is the most electronegative element. Electronegative elements have the property to remove electrons form the...

subject to the constraints $x+y \leq 4$ $$ x \geq 0, y \geq 0 \text {. } $$ $$ x+y \leq 4 $$ Hence, $\mathrm{z}$ is maximum at $(0,4)$ and max value is 16

Correct option is A $2 x+y+2=0$ Equation of the plane through $(-1,0,1)$ is $a(x+1)+b(y-0)+c(z-1)=0$ which is parallel to the given line and perpendicular to the given plane $-\mathrm{a}+2...

The answer will be (A) $\frac{5 \pi}{6}$ Explanation: You can write $\frac{7 \pi}{6}$ as $\left(\pi+\frac{\pi}{6}\right)$ Thus we can clearly see the angle falls in the third quadrant. And the...

The correct answer is (D) $\vec{i}+2 \vec{k}$

Correct option is (A) None of these MatrixA $=\left[\mathrm{a}_{\mathrm{ij}}\right]_{\mathrm{m} \times \mathrm{n}}$ square matrix Number of columns $=$ number of rows $\mathrm{n}=\mathrm{m}$

Q. 1 Prove that i. $\left[\begin{array}{lll}\hat{\imath} & \hat{\jmath} & \hat{k}\end{array}\right]=\left[\begin{array}{lll}\hat{\jmath} & \hat{k} &...

Solution: A type of chemical in marijuana that causes drug-like effects including the central nervous system and the immune system.  Main active cannabinoid in marijuana is...

Answer Given equations: r¯=(ı^+ȷ^)+λ(2ı^-ȷ^+k^) \overline{\mathrm{r}}=(\hat{\imath}+\hat{\jmath})+\lambda(2 \hat{\imath}-\hat{\jmath}+\hat{\mathrm{k}})...

To find – Angle between the two pair of lines Direction ratios of L1 = (1,0,3) Direction ratios of L2 = (-1,1,1) Tip – If (a,b,c) be the direction ratios of the first line and (a’,b’,c’) be that of...

Solution:   HOMOLOGOUS ORGANS ANALOGOUS ORGANS 1. They differ morphologically. 1. They show a superficial resemblance. 2. They have a similar internal structure. 2. Their internal structure is...

correct answer is option Alkenes are defined as either branched or unbranched hydrocarbons that possess at least one carbon–carbon double bond (CC) and have a general formula of CnH2n  

The correct option is (D) rectifier. Diode is a device which allows to pass a current only when it is forward biased. ... Hence it can be used as a rectifier.

The biological membrane, nucleic acids, and cellular energy transmission system all contain phosphorus. Detritus is leaf litter and other organic debris that has been mixed with soil to form humus....

Solution: Coupling is the linkage of two dominant or two recessive alleles. Repulsion shows that dominant alleles are linked with recessive alleles.

Solution:  

To find: the value of n. We can write it as 3n2 + 7 × n - 370 = 0 Therefore n = 37/3, 10 Rejecting 37/3 we get n = 10

Answer

Left hand side,

To Find: we need to find n when an = 0 Given: The series is 64, 60, 56, 52, 48, ... and an= 0 a1=64, a2= 60 and d=60–64 = –4 (Where a=a1 is first term, a2 is second term, an is nth term and d is...

To Find: First five terms of a given sequence. Condition: n ≥ 2 First five terms of a given sequence are  -1,-12,-16,-124,-1120

Let the equation of the required ellipse be Given: Length of Major Axis = \[20\] units …(i) We know that, Length of Major Axis = \[2a\] …(ii) ∴ From eq. (i) and (ii), we get...

(A)Papaver somniferum Opium contains two major groups of alkaloids. Morphin is the most common alkaloid found in opium. It is a narcotic drug derived from opium poppy seed pods. Diacetylmorphine is...

Given: \[\frac{{{x}^{2}}}{49}+\frac{{{y}^{2}}}{36}=1\]…(i) Since, \[49\text{ }>\text{ }36\] So, above equation is of the form, \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\] …(ii)...

Given: \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\]…(i) Since, \[25>9\] So, above equation is of the form, \[\frac{{{x}^{2}}}{{{a}^{2}}}+\frac{{{y}^{2}}}{{{b}^{2}}}=1\]…(ii)...

Correct option- 1 Explanation: Renin is secreted by the JG apparatus found in the afferent arteriole. The secretion is mediated by the fusion of renin-containing granules with the luminal membrane...

Solution: The activating effect of –NH2 group can be controlled by protecting the -NH2 group by acetylation with acetic anhydride in presence of pyridine and then carrying out the desired...

  Solution: The reaction involves the diazotization of the amine group.

a) the displacement in time T must always take non-negative values b) the displacement x in time T satisfies: v0T<x<v0T c) the acceleration is always a non-negative number d) the motion has no...

Solution: Option (i) is the answer. Reason: NH3​ is more basic than H2​O, therefore NH2−​ (Conjugate base of weak acid NH3​) is a stronger base than OH−.

Solution: Option (ii) is the answer. Reason: By Hoffmann bromamide degradation reaction, the amine formed contains one carbon less than that present in the amide.

Correct option:  A Explanation: Adaptive Radiation – Darwin’s Finches: Darwin’s finches are a classic example of adaptive radiation. The process in which one species gives rise to multiple species...

Correct option:  C Explanation: Golden Jackal – Tiger is the example of commensalism.  Commensalism  is a long-term biological interaction in which member of one species gain benefit and the second...

Correct option:  D Explanation: Parturition means child birth. It is the process of bringing forth a child from the womb. As the baby leaves the uterus, the uterine walls get approximated closely....

$2,2-Dichloropropane\xrightarrow[\Delta ]{aq.KOH}A\xrightarrow[ii)\,{{H}^{+}}]{i)\,Mg,\,Benzene}B$ Propanal Propanone isopropyl Magnesium Chloride Pinacol Solution: Pinacol $...

Correct option:(D)Carry cardiac impulse to ventricles Solution: X is bundle of His. Also called a atrioventricular bundle. Bundle of many cardiac muscle fibers specialized in electric conduction....

Correct option:(D)Predation Solution: Commensalism is the relationship wherein one organism is benefitted while others remain unaffected. Predation means to the act of feeding on other animals....

Correct option:  A Explanation: During anaerobic respiration the conversion of pyruvate into acetaldehyde, along with co-enzyme TPP, the cofactor required is Mg++.

Correct option:   D Explanation: In Salvia, there is a special mechanism known as lever mechanism or turn pipe mechanism. This enhances the pollination method of entomophily where insects acts as...

Correct option:  A Explanation: Growth hormones which are also called as phytohormones are organic materials that influence the physiological process in plants. Growth hormones like auxin and...

Correct option:  D Explanation: Detritivore are heterotrophs that get their nutrition by feeding on the detritus. Earthworms are detritivore as they eat decaying plant and animal matter in the soil....

Correct option:  A Explanation: Brewing Is the production of beer from a starch source in water and fermenting the resulting sweet liquid with yeast. The first step in preparation of beer is...

Correct option: C Explanation: Groundnut is a non-endospermic seed. The endosperm is a food storing tissue produced inside the seeds of most of flowering plants. It is a product of most of the...

Correct option:  D Explanation: While performing an artificial cross - It is done in flowers of plants selected as the male parent

Correct option:  A Explanation: Transposons are sequences of DNA.  They are also known as jumping genes as they move from one location on the genome to another.

Correct option:  A Explanation: Yeast shows asexual reproduction by budding, where a small bud os formed on the parent bud. The asexual reproduction in Penicillium  starts with the development of...

Correct option:(3) UAC Solution: In eukaryotes, initial codon on m-RNA is AUG. During translation, t-RNA, anticodons are exactly complementary to m-RNA. Hence anticodon will be UAC. [A = U, U = A, C...

(A) amplitude remains constant but frequency change (B) both amplitude and frequency do not change (C) both amplitude and frequency change (D) amplitude of the carrier wave changes according to...

Correct option:(1)Dried spores of Bacillus thuringiensis are sprayed on its vulnerable leaves Solution: Bt toxin is produced by bacteria Bacillus thuriengiensis. During sporulation, these bacteria...

Correct option:(1)Cytochromes, dehydrogenases, flavoproteins Solution: Co-enzymes of Electron Transport Chain in mitochondria are cytochromes, dehydrogenases, flavoproteins

(1) Calcitonin (2) Catecholamines (3) Cortisol (4) Mineralocorticoids Correct option: (2) Catecholamines Solution: X is adrenal Medulla. It secretes two hormones known as adrenaline (epinephrine)...

Option D $ \text { Let } I=\int \sqrt{\frac{x-5}{x-7}} {d x } {=\int \sqrt{\frac{(x-5)(x-5)}{(x-7)(x-5)}} d x} \text { [rationlising] } $ $ \begin{array}{l} =\int \frac{x-5}{\sqrt{x^{2}-5 x-7 x+35}}...

(i) \[\mathbf{3}{{\mathbf{x}}^{\mathbf{2}}}~\text{ }\mathbf{7x}\text{ }+\text{ }\mathbf{8}\text{ }=\text{ }\mathbf{0}\] Let us consider, \[a\text{ }=\text{ }3,\text{ }b\text{ }=\text{ }-7,\text{...

Given: Perimeter of rectangle = \[44\] cm Length + breadth = \[44/2\text{ }=\text{ }22\]cm Let us consider length be ‘x’ Breadth be ’\[22-x\]’ So according to the question, \[\begin{array}{*{35}{l}}...

CORRECT OPTION: A   Let $x+y=V$ $1+\frac{d y}{d x}=\frac{d v}{d x}$ $\frac{d y}{d x}=\frac{d v}{d x}-1$ $\therefore \frac{d v}{d x}-1=\cos V$ $\frac{d v}{d x}=1+\cos V$ $\frac{d v}{d x}=2 \cos...

Let us consider the larger number be ‘x’ Smaller number be ‘y’ So according to the question, \[{{x}^{2}}~\text{ }{{y}^{2}}~=\text{ }45\]… (i) \[{{y}^{2}}~=\text{ }4x\]… (ii) Now substitute the value...

Given: Sum of two number = \[9\] Let us consider first number be ‘x’ Second number be ‘\[9-x\]’ So according to the question, \[\begin{array}{*{35}{l}} {{\left( x \right)}^{2}}~+\text{ }{{\left(...

The correct option is option (A)$i \doteq 0, i_{L}=i_{C} \neq 0$ In parallel resonant circuit, the capacitive and inductive reactance are equal, hence currents are equal but $180^{\circ}$ out of...

Solution: The first 15 multiples of 8 are 8, 16, 24, 32, … to 15 terms Here, a = 8, d = 16 – 8 = 8 , n = 15

Solution: The given AP is 21, 18, 15,… Here, a = 21 and d = 18 – 21 = -3, We have, sum = 0 Let number of terms be n, then we can write:

Solution: Length of the roller, h = 2 m = 200 cm [1m = 100 cm] Inner diameter = 35 cm Inner radius, r = 35/2 cm Thickness = 7 cm Outer radius, R = (35/2)+7 = (35+14)/2 = 49/2 cm Volume of the iron...

Solution: Suppose the no. of stamps of $20 \mathrm{p}$ and $25 \mathrm{p}$ be $\mathrm{x}$ and $\mathrm{y}$ respectively. Then according the question $\begin{array}{l} x+y=47\dots \dots(i) \\ 0.20...

According to the question:, P’ \[(2,-3)\] is the reflection of P (a, b) in the x-axis Hence, the co-ordinates of P’ will be (a, – b) but P’ is \[(2,-3)\] On comparing, we get a = \[2\], b = \[3\]...

Correct option:(4)M phase Solution: ●Some dividing cells exit the cell cycle and enter vegetative inactive stage, called quiescent stage (G0​). ●Process occurs at the end of M−phase and beginning of...

Correct option:(3)7 million Solution: According to Robert May, global species diversity is about 7 million.

Correct option:(2)Cochlea (ii) Coiled part of the labyrinth Solution: ●Organ of Corti - Organ of the inner ear located within the cochlea on the basilar membrane. ●It contributes to the audition....

Correct option:(2)Lysine Solution: ●Glutamic Acid - is an acidic amino acid. ●Lysine - is a basic amino acid. ●Valine - is an aliphatic amino acid. ●Tyrosine - is an aromatic amino acid.

Correct option:(3)Species interaction Solution: ●Natality, Mortality and sex ratio are attributes of a population. ●Species interaction can be inter or intraspecific. ●Population forms the part of...

(1) 3 (2) 4 (3) 2 (4) 1   Correct Answer: (1) 3 Explanation:

Correct Option: A Solution: Analogous structures are those whose basic structure is the same but have different functions. Gills of prawn and lungs of man are analogous structures

(1) X-linked dominant (2) Autosomal dominant (3) X-linked recessive (4) Autosomal recessive Correct option:  Solution: In the following human pedigree, the filled symbols represent the affected...

Correct Option: A Solution: Imbricate is the condition when the margins of sepals or petals overlap one another without any particular direction. Like as in the Gulmohar.

The correct option is (3) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii). The explanation is as follows.

Solution: Correct Option B The term 'iso' refers to the presence of one Methyl group on the second carbon of a normal chain branch. The 'Yl' suffix was previously used to denote one -H less than the...

Correct Option: A Explanation: Coiled RNA strands and capsomeres are shown by the tobacco mosaic virus.

Correct Option: D) In general, ligands can be arranged in the following order in terms of increasing field strength: In accordance with the spectrochemical series $I ^{-}< Br ^{-}< SCN...

Correct option:(2)Bright orange bands Solution: After the bands are stained, they are viewed in UV light. Bands appear bright orange in colour. Ethidium bromide is the intercalating agent that...

Correct option: (2)          Explanation for the correct option:    The prokaryotic cells lack membrane bound organelles. The true nucleus is absent and is replaced by membrane less nucleoid....

Correct option: (3) Explanation for the correct option: Mucor has biflagellate zoospores is the wrong statement. Mucor is a non-flagellate fungus belonging to the Class Zygospore of kingdom Fungi....

As per the given information, Slant height of frustum of the cone as given in the question (l) $=4cm$ Let us assume that the ratio of the radius of the top circle to bottom circles...

Solution: (a) $2 x+3 y+4 z-12=0$ Let the coordinate of the foot of $\perp P$ from the origin to the given plane be $P(x, y, z)$. $2 x+3 y+4 z=12 \ldots$ The direction ratio are $(2,3,4)$...

Solution: It is known to us that If $\frac{\mathrm{x}-\mathrm{x}_{1}}{1_{1}}=\frac{\mathrm{y}-\mathrm{y}_{1}}{\mathrm{~m}_{1}}=\frac{\mathrm{z}-\mathrm{z}_{1}}{\mathrm{n}_{1}} \text { and }...

Solution: (2) Fat is a triglyceride composed of three fatty acid molecules and one glycerol molecule.

Solution: (2) Polyploidy cells have more than double the amount of chromosomes as haploid cells.

Solution: (4) The dissolved oxygen (DO) in a river with an input of home sewage rich in organic waste will be reduced, potentially resulting in fish death due to a lack of oxygen.

Solution: (3) Archaebacteria are the most primordial prokaryotes that initially appeared on Earth because they were able to live in the anaerobic hard environment of the time. Archaebacteria include...

Solution: (3) Phylloclade is the alteration of the stem into flat green organs that execute the tasks of leaves, whereas phyllode is the modification of the petiole.

Solution: (4) The sphincter of Oddi protects the entry of the hepatopancreatic duct into the duodenum.

Solution: (2) Both subsidiary cells and guard cells are modifications of epidermal cells, however guard cells have chloroplasts, whilst subsidiary cells do not.

Solution: (1) A style can grow from more than one pollen tube of the same species. It's a common occurrence in nature.

Solution: (4) Synapsis is the pairing of homologous chromosomes that takes place during meiosis but not in mitosis.

Solution: (2) Smaller animals have a greater BMR, which is linked to long-term energy generation and muscle weariness.

Solution: (3) When a plant genotype Aa Bb crosses with aabb, Independent Assortment produces four types of progeny in equal proportions. Aa Bb – gametes AB Ab aB ab Aa bb – Gametes ab ab ab ab...

Solution: (4) The bacterium Clostridium butylicum is used to make butyric acid. Lipase is produced by Candida lipolyticum.

Solution: (4) Apomixis is a unique technique that allows seeds to be produced without fertilisation.

Solution: (3) The urea–ornithine cycle occurs in the liver, hence the vein that leaves the liver has the most urea, which is the hepatic vein.