BSc CSIT Entrance Exam 2077 Questions with Answers

1. a$1$
2. b$\pi$
3. c$\frac{22}{7}$
4. d$-1$

Answer (b): $\pi$ is non-terminating and non-repeating, so it is irrational. The others are rational numbers.

Revise: Algebra (Class 11 notes)

1. a$P$
2. b$Q$
3. c$U$
4. d$\emptyset$

Answer (a): If $P\subset Q$, every element of $P$ is also in $Q$, so $P\cap Q=P$.

Revise: Algebra (Class 11 notes)

1. aElephant is a small animal
2. b100 is a number
3. cHari is Nepali citizen
4. d$x > 2$

Answer (d): A statement must be definitely true or false. $x>2$ depends on the value of $x$, so it is an open sentence, not a statement.

Revise: Algebra (Class 11 notes)

1. a${-8,2}$
2. b${8,-2}$
3. c$(8,-2)$
4. d${-8,-2}$

Answer (b): $x-3=5$ gives $x=8$ and $x-3=-5$ gives $x=-2$.

Revise: Algebra (Class 11 notes)

1. a$4$
2. b$3$
3. c$64$
4. d$2$

Answer (a): Put $x=3$, $y=64$: $a^3=64=4^3$, so $a=4$.

Revise: Algebra (Class 11 notes)

1. a$\frac{1}{x-5}$
2. b$\frac{1}{x+5}$
3. c$\frac{5}{y+x}$
4. d$x+5$

Answer (d): Let $y=x-5$, so $x=y+5$. Hence $f^{-1}(x)=x+5$.

Revise: Algebra (Class 11 notes)

1. a$\pi$
2. b$\frac{\pi}{2}$
3. c$2\pi$
4. d$\frac{\pi}{3}$

Answer (a): Period of $\cos(bx+c)$ is $2\pi/b = 2\pi/2=\pi$.

Revise: Trigonometry (Class 11 notes)

1. a$-\sqrt2$
2. b$-\frac{1}{\sqrt2}$
3. c$\frac{1}{\sqrt2}$
4. d$\sqrt2$

Answer (c): Equal angles with the same sine and cosine means the angle is $\pi/4$, so $x=\sin(\pi/4)=\frac{1}{\sqrt2}$.

Revise: Trigonometry (Class 11 notes)

1. a$n\pi\pm\frac{\pi}{6}$
2. b$n\pi\pm\frac{\pi}{4}$
3. c$n\pi\pm\frac{\pi}{2}$
4. d$n\pi\pm\frac{\pi}{3}$

Answer (b): $\sin^2x=\sin^2(\pi/4)$, and $\sin^2x=\sin^2\alpha$ gives $x=n\pi\pm\alpha$, so $x=n\pi\pm\frac{\pi}{4}$.

Revise: Trigonometry (Class 11 notes)

1. a$p^2=q^2+r^2$
2. b$p^2=qr$
3. c$pr=q^2$
4. d$p+q+r=0$

Answer (c): Terms $ar^2, ar^4, ar^6$: $pr=a^2r^8=(ar^4)^2=q^2$.

Revise: Algebra (Class 11 notes)

1. a$\frac{15}{7}$
2. b$15$
3. c$30$
4. d$10$

Answer (a): Middle term twice: $2(6p-2)=(3p+4)+(2p+7)$, so $12p-4=5p+11$ and $p=\frac{15}{7}$.

Revise: Algebra (Class 11 notes)

1. a$\begin{pmatrix}2&3\3&4\end{pmatrix}$
2. b$\begin{pmatrix}2&3\4&4\end{pmatrix}$
3. c$\begin{pmatrix}2&3\2&4\end{pmatrix}$
4. d$\begin{pmatrix}2&3\3&2\end{pmatrix}$

Answer (a): $a_{11}=2$, $a_{12}=a_{21}=3$, $a_{22}=4$.

Revise: Algebra (Class 11 notes)

1. a$0$
2. b$1$
3. c$-1$
4. d$-2$

Answer (c): The determinant is $(x+1)(1)-0=x+1=0$, so $x=-1$.

Revise: Algebra (Class 11 notes)

1. aone solution
2. btwo solutions
3. cmany solutions
4. dno solution

Answer (d): Same left side with different right sides is contradictory, so the lines are parallel and there is no solution.

Revise: Algebra (Class 11 notes)

1. a$0$
2. b$-2$
3. c$3$
4. d$\omega$

Answer (c): Expanding: $1-\omega-\omega^2+\omega^3=1-(\omega+\omega^2)+1=1+1+1=3$.

Revise: Algebra (Class 11 notes)

1. a$-\sqrt{15}$
2. b$\sqrt{15}$
3. c$\sqrt{-15}$
4. d$-i\sqrt{15}$

Answer (a): $\sqrt{-3}\sqrt{-5}=(i\sqrt3)(i\sqrt5)=i^2\sqrt{15}=-\sqrt{15}$.

Revise: Algebra (Class 11 notes)

1. a$x^2+x+6=0$
2. b$x^2-x+6=0$
3. c$x^2+x-6=0$
4. d$x^2-x-5=0$

Answer (c): Sum of roots $=-1$, product $=-6$, so $x^2-(\text{sum})x+\text{product}=x^2+x-6=0$.

Revise: Algebra (Class 11 notes)

1. a$-3$
2. b$3$
3. c$0$
4. d$6$

Answer (a): For $ax^2+2hxy+by^2=0$ the lines are perpendicular when $a+b=0$: $3+k=0$, so $k=-3$.

Revise: Analytic geometry (Class 11 notes)

1. a$2x+y=4$
2. b$2x+y=5$
3. c$x+2y=5$
4. d$2x-y=5$

Answer (b): The tangent to $x^2+y^2=r^2$ at $(x_1,y_1)$ is $xx_1+yy_1=r^2$, giving $2x+y=5$.

Revise: Analytic geometry (Class 11 notes)

1. a$9$
2. b$-3$
3. c$\pm3$
4. d$9$

Answer (c): The limit equals $3a^2=27$, so $a^2=9$ and $a=\pm3$.

Revise: Calculus (Class 11 notes)

1. a$\frac{2a}{p^2}$
2. b$p$
3. c$1$
4. d$0$

Answer (d): $\frac{dy}{dx}=\frac{2x}{p^2}-\frac{2p^2}{x^3}$. At $x=p$: $\frac2p-\frac2p=0$.

Revise: Calculus (Class 11 notes)

1. a$2x^{\frac32}-\cos x+e^{2x}$
2. b$x^{\frac32}-\cos x+e^{2x}$
3. c$2x^{\frac32}+\cos x+e^{2x}$
4. d$2x^{\frac32}-\cos x+2e^{2x}$

Answer (a): $\int3\sqrt x,dx=2x^{3/2}$, $\int\sin x,dx=-\cos x$ and $\int2e^{2x}dx=e^{2x}$.

Revise: Calculus (Class 11 notes)

1. a$64$
2. b$56$
3. c$\frac{56}{3}$
4. d$72$

Answer (b): Area $=\int_2^4 3x^2dx=[x^3]_2^4=64-8=56$.

Revise: Calculus (Class 11 notes)

1. a$1,-2$
2. b$1,2$
3. c$-1,1$
4. d$-1,2$

Answer (a): $f'(x)=4x^3-12x+8=4(x-1)^2(x+2)$, which is zero at $x=1$ and $x=-2$.

Revise: Calculus (Class 11 notes)

1. a$1^{st}$
2. b$2^{nd}$
3. c$3^{rd}$
4. dnone of the above

Answer (b): 'Permissible' (per-MIS-si-ble) is stressed on its second syllable.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aperishes
2. bincredible
3. cincur
4. dtemerity

Answer (a): PER-ish-es is stressed on the first syllable; in-CRED-i-ble, in-CUR and te-MER-i-ty are not.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. ain
2. bby
3. cof
4. dwith

Answer (c): "Glad of" something is the fixed collocation used here (glad of your help).

Revise: Grammar and Usage (Class 11 notes)

1. ato
2. bfor
3. con
4. dby

Answer (a): The stem is garbled, but 'addicted to' is the only natural preposition for a habit of addiction.

Revise: Grammar and Usage (Class 11 notes)

1. apleasant
2. bsecret
3. cpromise
4. dfeud

Answer (d): A vendetta is a long-running quarrel or blood feud.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. amildness
2. bacrimony
3. cunsuitable
4. dextravagant

Answer (b): Acerbity means sharpness or bitterness, close to acrimony.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aempty
2. balarm
3. cfull
4. dstuff

Answer (a): Replete means well filled or stocked, so its opposite is empty.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aencourage
2. bstop
3. ccrush
4. dpromote

Answer (a): 'Quell' means to suppress, so its opposite is 'encourage'.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. apandemic
2. binfectious
3. cendemic
4. dcontagious

Answer (d): A contagious disease spreads by contact or touch.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. alamb
2. bpork
3. cmutton
4. dvenison

Answer (a): Pork, mutton and venison are names of meat, while lamb is the name of the animal.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. ato a disgusting degree
2. bregularly
3. con duty
4. drarely

Answer (a): "Ad nauseam" means to a sickening or excessive degree.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. ashan't she?
2. bwon't she?
3. cwould she?
4. ddoesn't she?

Answer (b): The main clause has "will", so the tag is "won't she?".

Revise: Grammar and Usage (Class 11 notes)

1. awidth
2. bautumnal
3. cadvantage
4. ddifficult to understand

Answer (b): "Autumnal" describes a noun, so it is an adjective; width and advantage are nouns.

Revise: Grammar and Usage (Class 11 notes)

1. aavoid someone
2. bmaintain formality
3. cpay too much attention to correct rules of behavior or be too formal
4. ddo every things necessary

Answer (c): 'To stand on ceremony' means to be too formal or to pay too much attention to correct rules of behaviour.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aemotional object
2. bentertainment
3. ca fair chance
4. ddifficult to understand

Answer (d): "Double Dutch" means unintelligible gibberish.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aa
2. ban
3. cthe
4. dnone

Answer (d): "Nature" in the general sense takes no article.

Revise: Grammar and Usage (Class 11 notes)

1. asee about
2. bsee off
3. csee to
4. dsee through

Answer (a): 'See about' means to arrange or attend to something, as in 'see about getting a room ready'.

Revise: Grammar and Usage (Class 11 notes)

1. awear on
2. bworn away
3. cwear out
4. dwear off

Answer (b): Past perfect passive needs the participle, so "worn away" (gradually eroded).

Revise: Grammar and Usage (Class 11 notes)

1. aI am also
2. balso, I am
3. cso am I
4. dnone

Answer (c): "So + auxiliary + subject" agrees with a positive statement: "so am I".

Revise: Grammar and Usage (Class 11 notes)

1. aedible
2. bpungent
3. cSensuous
4. dPalatable

Answer (d): Palatable means pleasant to taste.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. adid I harm
2. bI harmed
3. cI harm
4. ddoes I harm

Answer (a): A sentence beginning with 'Never' needs inversion, so 'Never did I harm anyone' is correct.

Revise: Grammar and Usage (Class 11 notes)

1. abecome
2. bhas become
3. cis becoming
4. dhad become

Answer (c): "Nowadays" signals a present continuous action: "is becoming".

Revise: Grammar and Usage (Class 11 notes)

1. aa direct object
2. ban indirect object
3. ccomplement
4. dadjunct

Answer (c): "Very interesting" describes the object "presentation", so it is an object complement.

Revise: Grammar and Usage (Class 11 notes)

1. aprepare
2. bperform
3. ccollect
4. dframe

Answer (b): Of the options only 'perform' sits naturally with 'skills'; the intended verb may have been 'acquire', which is not offered.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. adietician
2. bpatrician
3. cpediatrician
4. dnurturer

Answer (a): A dietician specialises in food and nutrition.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. a$L/R$ and $CR$
2. b$LR$ and $CR$
3. c$R/L$ and $[LC]^{\frac12}$
4. d$CR$ and $1/LC$

Answer (a): $L/R$ and $CR$ both have dimension of time.

Revise: Physical Quantities (Class 11 notes)

1. a4 cm
2. b2 cm
3. c3 cm
4. d1 cm

Answer (d): From $v^2=u^2-2as$: $(u/2)^2=u^2-6a$ gives $a=u^2/8$. Then to stop from $u/2$: $s=\frac{(u/2)^2}{2a}=1$ cm.

Revise: Kinematics (Class 11 notes)

1. a$15^0$
2. b$45^0$
3. c$30^0$
4. d$60^0$

Answer (c): $R/H=\frac{2\sin\theta\cos\theta\cdot2}{\sin^2\theta}=4\cot\theta=4\sqrt3$, so $\cot\theta=\sqrt3$ and $\theta=30^0$.

Revise: Kinematics (Class 11 notes)

1. abody is at rest
2. bacceleration is not zero
3. cbody is in motion
4. dacceleration should be zero

Answer (b): Zero net force means zero acceleration (rest or uniform motion), so saying acceleration is not zero is wrong.

Revise: Dynamics (Class 11 notes)

1. aincreases
2. bdecreases
3. cremain same
4. ddepend upon nature of matter

Answer (c): Young's modulus is a property of the material, so it does not change with the length of the wire.

Revise: Elasticity (Class 11 notes)

1. a$2W$
2. b$8W$
3. c$4W$
4. d$9W$

Answer (b): Work is surface tension times the area increase with two surfaces: $W=8\pi R^2T$. Going from $R$ to $3R$ gives $8\pi T(9R^2-R^2)=64\pi R^2T=8W$.

Revise: Elasticity (Class 11 notes)

1. aIncreases
2. bremains unchanged
3. cdecreases
4. dfirst increases and then decreases

Answer (a): The alcohol expands more than the ball, so its density falls faster than the ball's volume rises and the buoyant force decreases; the apparent weight increases.

Revise: Thermal Expansion (Class 11 notes)

1. aboiling
2. bcritical temperature
3. cmelting point
4. dfreezing point

Answer (b): At the critical temperature the liquid and vapour phases become identical, so latent heat is zero.

Revise: Quantity of Heat (Class 11 notes)

1. a$KT$
2. b$2KT$
3. c$\frac12KT$
4. d$\frac23KT$

Answer (c): By equipartition each degree of freedom carries $\frac12kT$.

Revise: Ideal Gas (Class 11 notes)

1. a1:1
2. b4:9
3. c9:4
4. d3:2

Answer (c): Radiated heat $\propto$ surface area $\propto r^2$, so $9:4$.

Revise: Rate of Heat Flow (Class 11 notes)

1. a$14.5^0$
2. b$30^0$
3. c$42^0$
4. d$62^0$

Answer (b): For minima $a\sin\theta=2\lambda$. With $a=2.2\times10^{-6}$ m: $\sin\theta=\frac{1.1\times10^{-6}}{2.2\times10^{-6}}=0.5$, so $\theta=30^0$.

Revise: Diffraction of Light (Class 12 notes)

1. a$30^0$
2. b$60^0$
3. c$45^0$
4. d$72^0$

Answer (a): $n=\frac{\sin\frac{A+\delta}{2}}{\sin\frac A2}$ gives $\sin\frac{60+\delta}{2}=1.414\times0.5=0.707$, so $\frac{60+\delta}{2}=45^0$ and $\delta=30^0$.

Revise: Refraction Through Prisms (Class 11 notes)

1. a0.7 cm
2. b70 cm
3. c3.2 cm
4. d12 cm

Answer (d): $\lambda=v/f=0.72$ m. Path difference $=\frac{\lambda}{360}\times60=0.12$ m $=12$ cm.

Revise: Wave Motion (Class 12 notes)

1. a2r/3 from 4q
2. b2r from q
3. cr/2 from q
4. dr/2 from 4q

Answer (a): At distance $x$ from $q$: $\frac{q}{x^2}=\frac{4q}{(r-x)^2}$ gives $r-x=2x$, so $x=r/3$ from $q$, which is $2r/3$ from $4q$.

Revise: Electric Charges (Class 11 notes)

1. a$n^2$
2. b$\frac{1}{n^2}$
3. c$n$
4. d$\frac1n$

Answer (a): Series gives $C/n$ (minimum), parallel gives $nC$ (maximum). Ratio $=nC\big/(C/n)=n^2$.

Revise: Capacitor (Class 11 notes)

1. aone fourth
2. bdoubled
3. chalved
4. dfour times

Answer (b): Resistance halves, and $H=\frac{V^2}{R}t$ doubles for the same voltage.

Revise: DC Circuit (Class 11 notes)

1. azero
2. b5.0 Ohm
3. c0.5 Ohm
4. d1.1 Ohm

Answer (d): $E=I(R+r)$: $50=4.5(10+r)$, so $10+r=11.1$ and $r\approx1.1,\Omega$.

Revise: DC Circuit (Class 11 notes)

1. aa torque but not a force
2. ba force and a torque
3. cneither a force nor a torque
4. da force but not a torque

Answer (a): In a uniform field the forces on the two poles are equal and opposite (net force zero) but form a couple, giving a torque.

Revise: Magnetic Field (Class 12 notes)

1. a3000
2. b500
3. c20
4. d95

Answer (c): $Q=\frac{X_L}{R}=\frac{100}{5}=20$.

Revise: Alternating Currents (Class 12 notes)

1. a$2.8\times10^{-4}H$
2. b$7.5\times10^{-4}H$
3. c$5.8\times10^{6}H$
4. d$9.5\times10^{6}H$

Answer (c): $L=\frac{1}{4\pi^2f^2C}=\frac{1}{4\pi^2(1.02\times10^6)^2(420\times10^{-12})}\approx5.8\times10^{-5}$ H. The digits match option c; its exponent is likely misprinted.

Revise: Alternating Currents (Class 12 notes)

1. a$5\times10^5$ m/s
2. b$3\times10^3$ m/s
3. c$4\times10^4$ m/s
4. d$6\times10^6$ m/s

Answer (d): $\frac12mv^2=eV$: $v=\sqrt{\frac{2\times1.6\times10^{-19}\times100}{9.1\times10^{-31}}}\approx5.9\times10^6$ m/s.

Revise: Electrons (Class 12 notes)

1. a12.43 years
2. b15.43 years
3. c14.43 years
4. dsame as half life

Answer (c): Mean life $=\frac{T_{1/2}}{0.693}=\frac{10}{0.693}=14.43$ years.

Revise: Radioactivity and Nuclear Reaction (Class 12 notes)

1. alow cost
2. bcapable of handling low power
3. clow dissipation of energy
4. dhigh mobility of electrons than that of holes

Answer (d): In NPN the majority carriers are electrons, which are more mobile than holes, giving better frequency response.

Revise: Semiconductor Devices (Class 12 notes)

1. aorbital size
2. borbital orientation
3. corbital shape
4. dnuclear stability

Answer (b): The magnetic quantum number $m_l$ gives the spatial orientation of an orbital.

Revise: Atomic Structure (Class 11 notes)

1. a$\alpha$ rays
2. b$\beta$ rays
3. c$\gamma$ rays
4. dX-rays

Answer (c): Gamma rays are uncharged high-energy photons and penetrate most.

Revise: Nuclear Chemistry (Class 12 notes)

1. a$MgCl_2$
2. b$CH_4$
3. c$SiCl_4$
4. d$CCl_4$

Answer (a): Mg is a metal that transfers electrons to Cl, forming ionic $MgCl_2$; the others are covalent.

Revise: Chemical Bonding (Class 11 notes)

1. achlorine
2. bfluorine
3. cbromine
4. dIodine

Answer (b): Fluorine is the most electronegative element (4.0).

Revise: Classification of Elements (Class 11 notes)

1. a$+6$
2. b$+5$
3. c$+4$
4. d$+3$

Answer (a): $2x+7(-2)=-2$ gives $2x=12$, so $x=+6$.

Revise: Oxidation and Reduction (Class 11 notes)

1. a$CaO$
2. b$MgO$
3. c$CuO$
4. d$ZnO$

Answer (d): ZnO reacts with both acids and bases, so it is amphoteric; CaO and MgO are basic and CuO is basic.

Revise: Chemistry of Metals (Class 11 notes)

1. a20 six member rings and 12 five member rings
2. b12 six member rings and 20 five member rings
3. c12 six member rings and 10 five member rings
4. d12 six member rings and 8 five member rings

Answer (a): $C_{60}$ looks like a football: 20 hexagons and 12 pentagons.

Revise: Chemistry of Non-Metals (Class 11 notes)

1. aammonia
2. bnitric acid
3. csodium
4. dsulphuric acid

Answer (c): Down's cell electrolyses molten NaCl to obtain sodium.

Revise: Chemistry of Metals (Class 11 notes)

1. a2-methylpropane
2. b2,2-dimethylepropane
3. c2-methylpropene
4. d2-methylbutane

Answer (a): Iso-butane is $(CH_3)_3CH$, a propane chain with a methyl on C-2.

Revise: Hydrocarbons (Class 11 notes)

1. aTollen's reagent
2. bBaeyer's reagent
3. cFehling's reagent
4. dGrignard reagent

Answer (b): Cold dilute alkaline $KMnO_4$ is Baeyer's reagent, used to test unsaturation.

Revise: Hydrocarbons (Class 11 notes)

1. aWurtz reaction
2. bWolf-Kishner reduction
3. cCannizzaro's reaction
4. dReimer-Tiemann reaction

Answer (a): $2R\text{-}X+2Na\to R\text{-}R+2NaX$ in dry ether is the Wurtz reaction.

Revise: Haloalkanes (Class 12 notes)

1. a$C_nH_{2n}$
2. b$C_nH_{2n+2}$
3. c$C_nH_{2n-2}$
4. dnone of the above

Answer (b): Saturated hydrocarbons follow $C_nH_{2n+2}$.

Revise: Hydrocarbons (Class 11 notes)

1. aLassaigne's test
2. bLucas test
3. cVictor Meyer test
4. dCarbylamine test

Answer (a): Lassaigne's sodium fusion test detects N, S and halogens.

Revise: Fundamental Principles (Class 11 notes)

1. atrigonal planar
2. blinear
3. ctetrahedral
4. dsquare planar

Answer (c): Carbon is $sp^3$ hybridised with four bonds, giving a tetrahedral shape.

Revise: Chemical Bonding (Class 11 notes)

1. amol.wt./5
2. bmol.wt./3
3. cmol.wt./4
4. dmol.wt./2

Answer (a): $Mn^{7+}\to Mn^{2+}$ transfers 5 electrons, so $E=M/5$.

Revise: Volumetric Analysis (Class 12 notes)

1. a$BF_3$
2. b$AlCl_3$
3. c$FeCl_3$
4. d$NH_3$

Answer (d): $NH_3$ has a lone pair to donate, so it is a Lewis base; the other three are electron-deficient Lewis acids.

Revise: Ionic Equilibrium (Class 12 notes)

1. aelectrochemical
2. bgalvanic cell
3. cvoltaic cell
4. dall of the above

Answer (d): An electrochemical, galvanic or voltaic cell all mean a cell that produces electricity from a redox reaction.

Revise: Electrochemistry (Class 12 notes)

1. a4.184 joules
2. b5.184 joules
3. c3.184 joules
4. d2.184 joules

Answer (a): The thermochemical calorie is defined as 4.184 J.

Revise: Chemical Thermodynamic (Class 12 notes)

1. aconcentration of reacting species
2. btemperature
3. csurface area of the reactants
4. dall of the above

Answer (d): Concentration, temperature and surface area of reactants all affect the reaction rate.

Revise: Chemical Kinetics (Class 12 notes)

1. a$sp^2$ hybridized
2. b$sp^3$ hybridized
3. c$sp$ hybridized
4. d$sp^2d$ hybridized

Answer (a): Each C has three sigma bonds in a planar ring, so it is $sp^2$.

Revise: Aromatic Hydrocarbons (Class 11 notes)

1. ano turbidity occurs at room temperature
2. bturbidity appears within five minutes
3. cturbidity appears immediately
4. dturbidity appears within ten minutes

Answer (c): Tertiary alcohols form the chloride fastest via a stable carbocation, so turbidity appears at once.

Revise: Alcohols (Class 12 notes)

1. alipid
2. bcarbohydrate
3. cprotein
4. damino acid

Answer (a): Fats are triglyceride esters, classed as lipids.

Revise: Fundamental Principles (Class 11 notes)

1. aphenol and formaldehyde
2. burea and formaldehyde
3. cmelamine and formaldehyde
4. dethylene glycol and phthalic acid

Answer (a): Bakelite is the phenol-formaldehyde condensation polymer.

Revise: Phenols (Class 12 notes)

1. a$Hg_2Cl_2$
2. b$HgCl_2$
3. c$K_2[HgI_4]$
4. d$HgI_2$

Answer (b): Mercuric chloride $HgCl_2$ is called corrosive sublimate; $Hg_2Cl_2$ is calomel.

Revise: Study of Heavy Metals (Class 12 notes)

1. aIron
2. bCopper
3. cMercury
4. dSilver

Answer (a): Hematite is $Fe_2O_3$, an iron ore.

Revise: Chemistry of Metals (Class 11 notes)