BSc CSIT Entrance Exam 2082 Model Questions Questions with Answers

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

Answer (a): A singleton subset holds exactly one element, so there is one for each of the 4 elements.

Revise: Algebra (Class 11 notes)

1. a$f$ is one-one
2. b$f$ is onto
3. c$f$ is both one-one and onto
4. d$f$ is one-one into

Answer (c): A function has an inverse only when it is a bijection, that is, both one-one and onto.

Revise: Algebra (Class 11 notes)

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

Answer (a): Put $y=3x-4$, so $x=\frac{y+4}{3}$. Swapping variables gives $f^{-1}(x)=\frac{x+4}{3}$.

Revise: Algebra (Class 11 notes)

1. a$e^3$
2. b$3e$
3. c$3e^3$
4. d$1/e^3$

Answer (a): Using $\lim\left(1+\frac kx\right)^x=e^k$ with $k=3$, the limit is $e^3$.

Revise: Calculus (Class 11 notes)

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

Answer (d): $\sin x$ stays between $-1$ and $1$ while $x\to\infty$, so the ratio goes to $0$ (squeeze theorem).

Revise: Calculus (Class 11 notes)

1. acontinuous at $x=2$
2. bdiscontinuous at $x=2$
3. cremovable discontinuity at $x=2$
4. ddoes not exist

Answer (c): Left limit $=4$, right limit $=4$, so $\lim_{x\to2}f(x)=4$, but $f(2)=2$. The limit exists and differs from the value, so the discontinuity is removable.

Revise: Calculus (Class 11 notes)

1. a$\frac1{|x|}$
2. b$\pm\frac1x$
3. c$\frac1x$
4. d$\frac1{x^2}$

Answer (c): For $x>0$ the derivative is $\frac1x$, and for $x<0$, $\log(-x)$ also gives $\frac1x$. So it is $\frac1x$ for all $x\ne0$.

Revise: Calculus (Class 11 notes)

1. a$\tan x$
2. b$-\tan x$
3. c$\tan^3x$
4. d$\cot x$

Answer (b): $\frac{d(\sin^3x)}{d(\cos^3x)}=\frac{3\sin^2x\cos x}{-3\cos^2x\sin x}=-\tan x$.

Revise: Calculus (Class 11 notes)

1. a$e$
2. b$\frac1e$
3. c$1$
4. d$-1$

Answer (b): $f'(x)=\frac{1}{x\log x}$. At $x=e$, $\log e=1$, so $f'(e)=\frac1e$.

Revise: Calculus (Class 11 notes)

1. a$-\frac12$
2. b$\frac12$
3. c$0$
4. d$1$

Answer (a): $\sin x\cos x=\frac12\sin2x$, and $\sin2x$ has minimum $-1$, so the minimum is $-\frac12$.

Revise: Calculus (Class 11 notes)

1. a$(\log x-1)+C$
2. b$(x\log x-1)+C$
3. c$(x\log x+1)+C$
4. d$x(\log x-1)+C$

Answer (d): By parts with $u=\log x$, $dv=dx$: $x\log x-\int1,dx=x\log x-x+C=x(\log x-1)+C$.

Revise: Calculus (Class 11 notes)

1. a$\pi/3$
2. b$\pi/6$
3. c$\pi/4$
4. d$\pi/2$

Answer (a): The integral is $\sin^{-1}x$ evaluated from $0$ to $\frac{\sqrt3}{2}$, which is $\frac\pi3-0$.

Revise: Calculus (Class 11 notes)

1. a$16/3$
2. b$32/3$
3. c$64/3$
4. d$128/3$

Answer (c): Area $=\int_0^4y^2,dy=\frac{4^3}{3}=\frac{64}{3}$.

Revise: Calculus (Class 11 notes)

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

Answer (d): $(1-i)^2=-2i$, so $(1-i)^3=-2i(1-i)=-2-2i=-2(1+i)$. Also $1-i^3=1+i$. The ratio is $-2$. The paper prints 'modulus', a misprint for 'value': the modulus would be $2$, which is not an option, while $-2$ is.

Revise: Algebra (Class 11 notes)

1. areal, unequal, rational
2. breal, equal
3. cperfect square, equal
4. dunequal, imaginary

Answer (a): $D=9-8=1>0$ and a perfect square, so the roots ($1$ and $\frac12$) are real, unequal and rational.

Revise: Algebra (Class 11 notes)

1. a$\begin{pmatrix}1&0\0&1\end{pmatrix}$
2. b$\begin{pmatrix}19&43\22&50\end{pmatrix}$
3. c$\begin{pmatrix}19&22\43&50\end{pmatrix}$
4. d$\begin{pmatrix}22&50\43&19\end{pmatrix}$

Answer (b): $AB=\begin{pmatrix}19&22\43&50\end{pmatrix}$. Its transpose is $\begin{pmatrix}19&43\22&50\end{pmatrix}$.

Revise: Algebra (Class 11 notes)

1. aparallel
2. bintersecting
3. ccoincident
4. dindependent

Answer (c): The first equation is twice the second, so both represent the same line.

Revise: Analytic geometry (Class 11 notes)

1. a$99$
2. b$49.5$
3. c$4.5$
4. d$4$

Answer (d): $G^2=A\cdot H$, so $H=\frac{18^2}{81}=\frac{324}{81}=4$.

Revise: Algebra (Class 11 notes)

1. a$n\pi+\pi/6$
2. b$n\pi\pm\pi/6$
3. c$2n\pi\pm\pi/6$
4. d$(-1)^n\alpha+\pi/6$

Answer (b): $\tan^2\theta=\frac13=\tan^2\frac\pi6$, so $\theta=n\pi\pm\frac\pi6$.

Revise: Trigonometry (Class 11 notes)

1. a$1$
2. b$\pi/2$
3. c$\pi/4$
4. d$0$

Answer (b): For $x>0$, $\tan^{-1}x+\cot^{-1}x=\frac\pi2$.

Revise: Trigonometry (Class 11 notes)

1. a$(S-a)\tan\frac B2$
2. b$(S-b)\tan\frac B2$
3. c$(S-b)\tan\frac C2$
4. d$(S-a)\tan\frac C2$

Answer (b): The inradius is $r=(s-a)\tan\frac A2=(s-b)\tan\frac B2=(s-c)\tan\frac C2$, so $(s-b)\tan\frac B2$ fits.

Revise: Trigonometry (Class 11 notes)

1. a$2/3$ units
2. b$2/5$ units
3. c$10/3$ units
4. d$3/10$ units

Answer (d): Rewrite the first as $6x+8y=12$. Distance $=\frac{|15-12|}{\sqrt{36+64}}=\frac{3}{10}$.

Revise: Analytic geometry (Class 11 notes)

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

Answer (b): Use $abc+2fgh-af^2-bg^2-ch^2=0$ with $a=12,b=2,h=-5,g=\frac{11}2,f=-\frac52,c=\lambda$: $24\lambda+137.5-75-60.5-25\lambda=0$, so $\lambda=2$.

Revise: Analytic geometry (Class 11 notes)

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

Answer (a): Diameter form: $(x-1)(x-0)+(y+1)(y-2)=0$, which gives $x^2-x+y^2-y-2=0$.

Revise: Analytic geometry (Class 11 notes)

1. a$\frac12,\frac12,\frac12$
2. b$\frac13,\frac13,\frac13$
3. c$\pm\frac1{\sqrt2},\pm\frac1{\sqrt2},\pm\frac1{\sqrt2}$
4. d$\pm\frac1{\sqrt3},\pm\frac1{\sqrt3},\pm\frac1{\sqrt3}$

Answer (d): Equal direction cosines $l=m=n$ with $l^2+m^2+n^2=1$ give $3l^2=1$, so $l=\pm\frac1{\sqrt3}$.

Revise: Vectors (Class 11 notes)

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

Answer (a): Both $L/R$ and $CR$ are time constants, so both have the dimension of time.

Revise: Physical Quantities (Class 11 notes)

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

Answer (d): In the first 3 cm, $u^2-\left(\frac u2\right)^2=2a(3)$, so $\frac{3u^2}{4}=6a$ and $2a=\frac{u^2}{4}\text{ per cm}$. Then $\left(\frac u2\right)^2=2as'$ gives $s'=\frac{u^2/4}{u^2/4}=1$ cm.

Revise: Kinematics (Class 11 notes)

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

Answer (c): $\frac RH=4\cot\theta=4\sqrt3$, so $\cot\theta=\sqrt3$ and $\theta=30^\circ$.

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 (Newton's first law). The body may be at rest or move uniformly.

Revise: Dynamics (Class 11 notes)

1. aincrease
2. bdecrease
3. cremain same
4. ddepend upon nature of matter

Answer (c): Young's modulus is a property of the material, not of the dimensions of the wire.

Revise: Elasticity (Class 11 notes)

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

Answer (b): $W=8\pi TR^2$ (two surfaces). New work $=8\pi T(9R^2-R^2)=8\times8\pi TR^2=8W$.

Revise: Elasticity (Class 11 notes)

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

Answer (a): Alcohol expands more, so its density falls faster than the ball's volume rises. The upthrust drops and the apparent weight increases.

Revise: Thermal Expansion (Class 11 notes)

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

Answer (b): At the critical temperature the liquid and vapour phases become identical, so no latent heat is needed.

Revise: Quantity of Heat (Class 11 notes)

1. a$KT$
2. b$2KT$
3. c$\frac12KT$
4. d$\frac34KT$

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

Revise: Ideal Gas (Class 11 notes)

1. a$1:1$
2. b$4:9$
3. c$9:4$
4. d$3:2$

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

Revise: Rate of Heat Flow (Class 11 notes)

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

Answer (b): $a\sin\theta=n\lambda$: $\sin\theta=\frac{2\times550\times10^{-9}}{22\times10^{-7}}=0.5$, so $\theta=30^\circ$.

Revise: Diffraction of Light (Class 12 notes)

1. a$5$
2. b$7$
3. c$6$
4. d$8$

Answer (b): Three mutually perpendicular mirrors act like a corner reflector, giving $2^3-1=7$ images.

Revise: Reflection at Curved Mirrors (Class 11 notes)

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

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

Revise: Refraction Through Prisms (Class 11 notes)

1. a$0.7$ cm
2. b$70$ cm
3. c$1.2$ cm
4. d$12$ cm

Answer (d): $\lambda=\frac{360}{500}=0.72$ m. Path difference $=\frac{\lambda}{360^\circ}\times60^\circ=\frac{0.72}{6}=0.12$ m $=12$ cm.

Revise: Mechanical Waves (Class 12 notes)

1. a$2r/3$ from $4q$
2. b$2r$ from $q$
3. c$r/2$ from $q$
4. d$r/2$ from $4q$

Answer (a): Let the point be $x$ from $q$: $\frac{q}{x^2}=\frac{4q}{(r-x)^2}$ so $r-x=2x$ and $x=\frac r3$. It is $\frac{2r}{3}$ from $4q$.

Revise: Electric Charges (Class 11 notes)

1. a$n^2$
2. b$1/n^2$
3. c$n$
4. d$1/n$

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

Revise: Capacitor (Class 11 notes)

1. aOne fourth
2. bDoubled
3. cHalved
4. dFour times

Answer (b): Half the length gives half the resistance. Heat $=\frac{V^2t}{R}$, so it doubles.

Revise: DC Circuit (Class 11 notes)

1. azero
2. b$5.0\ \Omega$
3. c$0.5\ \Omega$
4. d$1.1\ \Omega$

Answer (d): $E=I(R+r)$: $50=4.5(10+r)$, so $r=\frac{50}{4.5}-10\approx1.1\ \Omega$.

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 (b): In a non-uniform field the two poles feel unequal forces, so there is a net force as well as a torque.

Revise: Magnetic Field (Class 12 notes)

1. a$5000$
2. b$500$
3. c$20$
4. d$95$

Answer (c): $Q=\frac{X_L}{R}=\frac{100}{5}=20$. The paper prints the reactance as 100 Hz, a misprint for 100 ohm, since a reactance is measured in ohms.

Revise: Alternating Currents (Class 12 notes)

1. a$2.8\times10^{-5}$ H
2. b$7.6\times10^{-5}$ H
3. c$5.8\times10^{-5}$ H
4. d$9.6\times10^{-6}$ H

Answer (c): $L=\frac{1}{4\pi^2f^2C}=\frac{1}{39.48\times(1.02\times10^6)^2\times420\times10^{-12}}\approx5.8\times10^{-5}$ H.

Revise: Alternating Currents (Class 12 notes)

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

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

Revise: Electrons (Class 12 notes)

1. a$12.43$ years
2. b$16.43$ years
3. c$14.43$ years
4. dsame as half life

Answer (c): Mean life $=\frac{T_{1/2}}{0.693}=1.443\times10=14.43$ 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 holes

Answer (d): In an NPN transistor the majority carriers are electrons, which move faster than holes, giving faster response.

Revise: Semiconductor Devices (Class 12 notes)

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

Answer (c): The azimuthal quantum number $l$ gives the subshell and so the shape of the orbital (s, p, d, f).

Revise: Atomic Structure (Class 11 notes)

1. a$\alpha$ rays
2. b$\beta$ rays
3. c$\gamma$ rays
4. dall have equal penetrating power

Answer (c): Gamma rays have no mass or charge and penetrate the most; alpha rays the least.

Revise: Nuclear Chemistry (Class 12 notes)

1. a$\ce{MgCl2}$
2. b$\ce{CH4}$
3. c$\ce{SiCl4}$
4. d$\ce{CCl4}$

Answer (a): $\ce{MgCl2}$ is formed from a metal and a non-metal by transfer of electrons. The others are covalent.

Revise: Chemical Bonding (Class 11 notes)

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

Answer (b): Electronegativity increases across a period and up a group, so fluorine is highest.

Revise: Classification of Elements (Class 11 notes)

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

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

Revise: Oxidation and Reduction (Class 11 notes)

1. a$\ce{CaO}$
2. b$\ce{MgO}$
3. c$\ce{CuO}$
4. d$\ce{ZnO}$

Answer (d): ZnO reacts with both acids and bases, so it is amphoteric. CaO and MgO are 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): $\ce{C60}$ is a truncated icosahedron with 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 process electrolyses molten NaCl to get sodium metal.

Revise: Chemistry of Metals (Class 11 notes)

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

Answer (a): Iso-butane has a three carbon chain with a methyl on carbon 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 $\ce{KMnO4}$ is Baeyer's reagent, used to test for unsaturation.

Revise: Hydrocarbons (Class 11 notes)

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

Answer (a): $2R-X+2Na\to R-R+2NaX$ 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): Alkanes are saturated, with formula $C_nH_{2n+2}$.

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 in methane is $sp^3$ hybridised with bond angle $109.5^\circ$.

Revise: Hydrocarbons (Class 11 notes)

1. amol. wt./6
2. bmol. wt./3
3. cmol. wt./4
4. dmol. wt./2

Answer (a): Each $\ce{Cr2O7^2-}$ gains 6 electrons in acid, so equivalent weight $=\frac M6$.

Revise: Volumetric Analysis (Class 12 notes)

1. a$\ce{BF3}$
2. b$\ce{AlCl3}$
3. c$\ce{FeCl3}$
4. d$\ce{NH3}$

Answer (d): A Lewis base donates an electron pair. $\ce{NH3}$ has a lone pair, while the others are electron deficient acids.

Revise: Ionic Equilibrium (Class 12 notes)

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

Answer (d): Galvanic and voltaic cells are the same thing, and both are electrochemical cells.

Revise: Electrochemistry (Class 12 notes)

1. a$4.184$ joules
2. b$5.184$ joules
3. c$3.184$ joules
4. d$2.184$ 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 all change the rate.

Revise: Chemical Kinetics (Class 12 notes)

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

Answer (b): Each carbon forms three sigma bonds in a plane, so it is $sp^2$ hybridised.

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, so turbidity appears immediately.

Revise: Alcohols (Class 12 notes)

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

Answer (a): Fats are esters of glycerol and fatty acids, which are lipids.

Revise: Bio-Inorganic Chemistry (Class 11 notes)

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

Answer (a): Bakelite is a condensation polymer of phenol and formaldehyde.

Revise: Phenols (Class 12 notes)

1. a$\ce{Hg2Cl2}$
2. b$\ce{HgCl2}$
3. c$\ce{K2[HgI4]}$
4. d$\ce{HgI2}$

Answer (b): Mercuric chloride $\ce{HgCl2}$ is corrosive sublimate. $\ce{Hg2Cl2}$ is calomel.

Revise: Study of Heavy Metals (Class 12 notes)

1. airon
2. bcopper
3. cmercury
4. dsilver

Answer (a): Haematite is $\ce{Fe2O3}$, an ore of iron.

Revise: Chemistry of Metals (Class 11 notes)

1. a1st
2. b2nd
3. c3rd
4. dnone of the above

Answer (b): The word is stressed per-MIS-si-ble, on the second syllable.

Revise: Grammar and Usage (Class 11 notes)

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

Answer (a): PER-ish has first syllable stress. In-CRED-i-ble, in-CUR and te-MER-i-ty stress later syllables.

Revise: Grammar and Usage (Class 11 notes)

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

Answer (c): The adjective glad takes of with the noun: glad of your help.

Revise: Grammar and Usage (Class 11 notes)

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

Answer (a): Slave to is the fixed collocation.

Revise: Grammar and Usage (Class 11 notes)

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

Answer (d): A vendetta is a long-running quarrel, a 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 full, so the opposite is empty.

Revise: Vocabulary and Word Formation (Class 11 notes)

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

Answer (a): Quell means to put down or suppress, so encourage is the opposite. Promote is a weaker fit.

Revise: Vocabulary and Word Formation (Class 11 notes)

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

Answer (d): Contagious means spread by direct or indirect contact.

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 the point of sickness, that is, to a disgusting 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. aavoid someone
2. bmaintain formality
3. cpay too much attention to correct rules of behavior or be too formal
4. ddo everything necessary

Answer (c): To stand on ceremony means to be too formal or to insist on strict rules of etiquette.

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 something that is hard or impossible to understand.

Revise: Vocabulary and Word Formation (Class 11 notes)

1. aphysical strength
2. bnatural strength
3. cmagnetic strength
4. dcontinuous electrical pulses

Answer (d): Analog computers process continuously varying electrical signals that represent physical quantities.

Revise: Computer System (Class 11 notes)

1. a#, @
2. b^, *
3. c?, *
4. d?, #

Answer (c): The wild cards are ? (one character) and * (any number of characters).

Revise: Computer Software and Operating System (Class 11 notes)

1. aMegabyte
2. bGigabyte
3. cByte
4. dTerabyte

Answer (b): The order from large to small is terabyte, gigabyte, megabyte, byte, so gigabyte is second largest.

Revise: Computer System (Class 11 notes)

1. aCPU and hard disk
2. bRAM and ROM
3. cCPU and RAM
4. dall of these

Answer (c): Cache is a fast buffer between the CPU and the main memory (RAM).

Revise: Computer System (Class 11 notes)

1. aMicrosecond
2. bNanosecond
3. cTerasecond
4. dGigasecond

Answer (b): Nano means $10^{-9}$, so a nanosecond is one billionth of a second.

Revise: Computer System (Class 11 notes)

1. avirtual memory
2. bvolatile memory
3. cnon volatile memory
4. dcache memory

Answer (b): RAM loses its contents when power is off, so it is volatile memory.

Revise: Computer System (Class 11 notes)

1. aCentral Planning Unit
2. bComputer Planning Union
3. cComputer Processing Unit
4. dCentral Processing Unit

Answer (d): CPU means Central Processing Unit.

Revise: Computer System (Class 11 notes)

1. aControl & C
2. bCommand & C
3. cControl & V
4. dCommand and V

Answer (a): Ctrl + C copies the selected text on Windows. (Command + C is the Mac equivalent.)

Revise: Computer Software and Operating System (Class 11 notes)

1. aWindows
2. bLinux
3. cUnix
4. dLaTeX

Answer (d): LaTeX is a document preparation system. The others are operating systems.

Revise: Computer Software and Operating System (Class 11 notes)