This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 71201. |
Que write a degree of avere polynomial? |
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Answer» Thedegreeof thezero polynomialis either left undefined, or is defined to be negative (usually −1 or ). Like any constant value, the value 0 can be considered as a (constant)polynomial, called thezero polynomial. It has no nonzero terms, and so, strictly speaking, it has nodegreeeither. Well, it depends. Mathematical practice shows that sometimes it is useful to define the degree of the zero polynomial to be zero, sometimes to define it to be−∞−∞and sometimes to leave is undefined. Which option one chooses depends on what one is trying to do. This is quite different with what happens with the degree of all other polynomials, which is always defined in the same way (*) But don't think that if for the slightiest of reasons we were to fnd it useful to change the definition to do something we wanted, we would. (*) Actually, that is not exactly true: we sometimes put degrees on polynomials which are different from the usual ones, but usually only on polynomials with more than one variable. |
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| 71202. |
nswer the following queWhat is cultivation? |
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Answer» The soil around existing plants is cultivated (by hand using a hoe, or by machine using a cultivator) to destroy weeds and promote growth by increasing soil aeration and water infiltration. Soil being prepared for the planting of a crop is cultivated by a harrow or plow. |
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| 71203. |
In A ABC,CA respectively. If AB- 6 cm, BC 7.2 cm and CA 7.8 cmfind the perimeter of Δ DEFD, E and F are the midpoints of AB, BC and |
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Answer» thanks |
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| 71204. |
4. PQRS is a parallelogram with PQ II SR. If P (2x + 10) and Q-(3x-25)0, find the valueof x and the measures of all the angles of parallelogram PQRS. |
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Answer» In a parallelogram sum of adjacent angles are supplementaryA+B =1802x+10+3x-25=1805x-15=1805x=180+155x=195x=195/5x=39 |
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| 71205. |
I. Write any two important features of Deccan Plateau. |
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Answer» The features of Deccan Plateau are as follows:- ●The Deccan Plateau lies to the south of the Satpura Range and extends till Cape Comorin.●It is composed of many very old crystalline rocks. ●It slopes towards the east.●Its height can vary from 300 m to 900 m above the mean sea level. |
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| 71206. |
ABCD is a quadrilateral in which P, Q, R and S aremid-points of the sides AB, BC, CD and DA(see Fig 8.29). AC is a diagonal. Show that:SR 11 AC and SR =(ii) PQ SR(ii) PQRS is a parallelogram.(i)AC |
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| 71207. |
Show that 5-V3 is Irrational number. |
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Answer» Let us assume that 5 - root 3 is rational. Then it can be written in the form 5 - root3 = p/q or 5 - p/q = root3 It implies root3 is a rational number [Since 5 - p/q are rationals] But this contradicts to the fact that root 3 is irrational. Hence our supposition was wrong. Therefore 5 - root 3 is irrational. |
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| 71208. |
Show that V3 is an irrational number |
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| 71209. |
3. In Fig. 8.107, AB IICD IIEF and GH IIKL. Find ZHKL. |
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| 71210. |
)Show that 4 /2 is an irrational number. |
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| 71211. |
Show that 4ă/2 is an irrational number. |
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Answer» 4√2 ko multiple kardo 1/4se, |
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| 71212. |
th(111)00 and saves 1224 per month. Find the ratio of:(i) his income and savings(i) his expenditure and savings(iü)his income and expendithre |
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| 71213. |
A school has 1800 students oh its , 40IUale giMohnish secured 45 marks out of 75 in Mathematics. Find the percentage of marks obtained byăťă¤5000 Rohan spends 16500. What per cent of his income does he sain Mathematics. |
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Answer» The percentage of marks obtained by Mohnish in Mathematics. -45/75 * 100 = 60% 60% |
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| 71214. |
A masaves、sohis saving account per month and spends 80% от ns a ary, r nu ms monthy sa aryA number is increased by 10% and then decreased by 10%. Find the net increase or decrease percent.The strength of an audition is increased by 30% in the first year and decreased by 10% in the second year.I v. |
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Answer» Let 1st no. be xincrease by 10%x+x/10=11x/10now decrease 10%11x/10-(11x/10)/10=99x/100the decrease is x-99x/100x/100decrease % is 1% |
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| 71215. |
P, Q, R and S are respectively the midpoints of thesides AB, BC, CD and DA of a quadrilateral ABCD.Show that() PQll AC and PQ AC(ii) PQ II SRiii) PORS is a parallelogram. |
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| 71216. |
in figure, AB II PO II CD.AB-7 units. CDsy units andPQ=zunits. Prove that +x y |
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Answer» See the diagram. ΔABD andΔPQD are similar, as the corresponding sides are parallel. x/z = BD / QD => 1/x = QD /(z * BD) ΔCDB andΔPQB are similar, as corresponding sides are parallel. y/z = BD/ BQ => 1/y = BQ / (z * BD) Add the two equations: 1/x + 1/y = (BQ + QD) / (z * BD) = 1 /z Please like the solution 👍 ✔️👍 |
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| 71217. |
If a diameter of a circle bisects each of the two chords of a circle thenprove that the chords are parallel. |
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| 71218. |
60. In the given figure, three circles withcentres A, B, C respectively touch eachother externally. If AB = 5 cm., BC = 7cm, and CA 6 cm., then the radius ofthe circle with centre A is |
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Answer» thnx |
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| 71219. |
Prove that (532is an irrational numberShow that 2+3 is an irrational numberShow that one and only one ofn, + 2 and 11+4 is divisible by a8 |
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Answer» let 2+√3 be rationalso 2+√3 can be written in p/q form2+√3= p/q√3= p/q-2 = p-2q/q√3 is irrational irrational is not equal to rational so our assumption is wrongso 2+√3 is irrational |
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| 71220. |
7. The ages of two persons are in the ratio 5:7.8:13. Find their present ages.persons are in the ratio 5.7 Eighteen years ago their ages were in the |
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| 71221. |
[9T0EPERN न,82 ws =L___I S=, . - पु धन < (WIS 9T kAR |
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| 71222. |
हा 0by iy DA 1 A | PR LY i MR VUL STt B० 2.५ 2४0०2 14 2 L A 71 B R4 i RURIS 2 BLRIR RIS i) B kAR |
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Answer» V= IR12/2.5*10^-3= R4.8kohm= R |
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| 71223. |
A kAR e \i} fanA § +4’a,__fl_‘w i QV}"’\.‘ ki |
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Answer» Tan A = sinA/cosA Cot A= cosA / sinA Sin²A+ cos²A= 1____________________________Answer:1+tan²A/1+cot²A = tan²A |
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| 71224. |
12. The monthly incomes of Aryan iare in the ratio 3: 4 and their monttores are in the ratio S : 7. If each sa00 per month, find their monthly incomes, uris method. This probiem reflects which val |
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Answer» Like my answer if you find it useful! |
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| 71225. |
4. Find the value of k for which one root of the quadratic equation kx2- 14x + 80 is six times the other |
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| 71226. |
17. AB and AC are two chords of a circle of radius r such that AB 2AC.If p and q are the distances of AB and AC from the centre then provethat 4 q^{2}=p^{2}+3 r^{2} |
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| 71227. |
Q26. In the given figure, AB | PQ II CD, ABr units, CD - y units andPQ = z units, prove that+Bl |
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Answer» ΔABD andΔPQD are similar, as the corresponding sides are parallel. x/z = BD / QD => 1/x = QD /(z * BD) ΔCDB andΔPQB are similar, as corresponding sides are parallel. y/z = BD/ BQ => 1/y = BQ / (z * BD) Add the two equations: 1/x + 1/y = (BQ + QD) / (z * BD) = 1 /z |
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| 71228. |
15. AD R BC are equal perpendicular to a line segment AB. Show that CD bisects AB. |
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| 71229. |
1. In the given figure, QRis a common tangentto the given circlestouching externallyat the point T. Thetangent at T meets QRat P. If PT 3.8 cm,then find the length of QR (in cm). |
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| 71230. |
1. In an election, there were only two candidates.The winner polled 55% votes and won by amargin of 8756 votes. Find the total number ofvotes polled. |
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Answer» According to the question,55% of votes - 45 % of votes = 8756Let the total number of votes be x.Then, 55 % of x - 45 % of x = 8756=> (11/20 - 9/20) * x = 8756=> 2x/20 = 8756=> x/ 10 = 8756=> x = 87560 |
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| 71231. |
In an election between two candidates, the winner gets 66%% votes and wins by384 votes. If no vote is declared invalid, find the total number of votes polled |
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Answer» Suppose total no. of votes is xand Candidate with 66% votes be m and Candidate with remaining 34% votes be n. Given that,m-n = 144=> .66x - .34x = 384 (putting values of m and n)=> x = 384/.32=> x = 1200 |
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| 71232. |
(OR)DIE 2.are the xeroes of p(x) = kx2 + 5x +r then show kar |
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| 71233. |
If 29 workers were paid 3335 as wages, then how many workers can be paid with 3 4830at the same rate?5.Unitary methodRATIO AND PROPORTION18 |
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| 71234. |
In an election three candidatescontested. The first got 0.75 ofthe votes, the second got 0.15 ofthe votes while the third got 800votes. How many people casttheir votes if 380 votes got werespoilt?A.C.11 8007 200B.8 00011 420 |
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Answer» Let x people cast their votes First got votes = .75xSecond got votes = .15xThird got votes = 800 Then,As per given condition.75x + .15x + 800 + 380 = xx - (.90x) = 1180.10x = 1180x = 1180/.10x = 11800 Therefore, Number of people cast votes = 11800 (A) is correct option |
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| 71235. |
Qlfind the value of k for which the equation kx2-5x + k = 0has equal roots |
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| 71236. |
In Fig. 5.27, POQ is a line. Ray OR isperpendicular to line PQ. OS is another ray lyingbetween rays OP and OR. Prove thatFig. 5.27 |
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| 71237. |
Fig. 6.165. In Fig. 6.17, POQ is a line. Ray OR is perpendicularto line PO. OS is another ray lying between raysOP and OR. Prove that2 |
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| 71238. |
4. In figure 3.84. O is the centre of thecircle. Seg AB, seg AC are tangentsegments. Radius of the circle isrand l(AB)-r. Prove that, DABOCis a square.Fig. 3.84 |
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Answer» full answer from the equation 1 and 2..we prove that ABOC is a square |
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| 71239. |
? Why?Fig. 3.192. In the adjoining figure, O is the centreof the circle. From point R,seg RM and seg RN are tangentsegments touching the circle atM and N. If (OR)10 cm andradius of the circle 5 cm, then |
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| 71240. |
26. A solid is in the shape of a cone andmounted on a hemisphere of same baseradius. If the curved surface areas of thehemispherical part and the conical partare equal, then find the ratio of the radiusand the height of the conical part. |
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Answer» Let radius ( r ) = x l = 2x h =√ l² - r² h =√ ( 2x )² - x² h =√ 3x² h =√3 x ∴ Ratio of r and h = x :√3 x r : h = 1 :√3 |
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| 71241. |
22 A toy is in the form of a cone of base radius 35 cm mounted on a hemisphere of base diameter 7 cmthe total height of the toy is 155 cm, find the total surface area of the toy. UseORFind the area of the following diagram.7 m16nection 'D |
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| 71242. |
A toy is in the fom of a cone of base radius3.5 cm mounted on a hemisphere of base diameter7 cm. If the total height of the toy is 15.5 cm, findthe total surface area of the toy. |
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| 71243. |
Two candidates fought an election. One of them got 62% of the total votes and won bytotal number of votes polled? |
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Answer» winner get =62% votelosser get= 38% vote their difference = 24 24 = 432 1= 432/24= 18therefore 100% vote = 18×100=1800 winner got = 68%looser got = 100 - 68 = 32%difference of both = 68 - 32 = 36 %LET total number of votes = X A/Q 32% of X = 432(32/100)x X = 432X = (432 x 100)/32X = 1350 votes (ANS) |
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| 71244. |
Q26. A cylindrical vessel, with an internal diameter 10 cm and height 10.5cm is full of water. A solid cone of base diameter 7 cm and height 6 cm iscompletely immersed in water. Find the volume of(i). Water displaced out of a cylindrical vessel.(ii) Water left in the cylindrical vessel. |
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| 71245. |
In an election, there were only two candidates. The winner got 63% votes and 9620 votes. Find the total number of votes polled. |
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| 71246. |
Assignment 5:1. Line PQ and line RS intersect each other at the point O. mLPOR= 52°. Findthe measures of LPOS,SOR and L90R.P520Solution : |
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| 71247. |
Two candidates contested an election. If one got 480 votes which are 60% of voterspolled, what was the total number who voted? |
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| 71248. |
Find the values of k so that+is a factorof kx2 -2kx-3. Find the values of k so that |
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Answer» Let p( x ) = k² x² - 2kx - 3 If ( x + 1 ) is a factor p( x ) then Remainder p ( - 1 ) = 0 k² ( - 1 )² - 2 k ( - 1 ) - 3 = 0 k² + 2k - 3 = 0 k² - k + 3k - 3 = 0 k ( k - 1 ) + 3 ( k - 1 ) = 0 ( k - 1 ) ( k + 3 ) = 0 k - 1 = 0 or k + 3 = 0 k = 1 or k = - 3 |
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| 71249. |
Q.9. In figure, POQ is a line. Ray OR PQ:another ray lying between OP and OR.Prove that: ROSQOS -LPOS2[Board Term I, 2012, Set-42; 2011,s |
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| 71250. |
In Fig 7.51, PR> PQ and PS bisects LQPR. Provethat Z PSR> ZPSQ.Fig. |
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Answer» Given: PR > PQ & PS bisects ∠QPR To prove: ∠PSR > ∠PSQ Proof: ∠PQR > ∠PRQ — (i) (PR > PQ as angle opposite to larger side is larger.) ∠QPS = ∠RPS — (ii) (PS bisects ∠QPR) ∠PSR = ∠PQR +∠QPS — (iii) (exterior angle of a triangle equals to the sum of opposite interior angles) ∠PSQ = ∠PRQ + ∠RPS — (iv) (exterior angle of a triangle equals to the sum of opposite interior angles) Adding (i) and (ii) ∠PQR + ∠QPS > ∠PRQ + ∠RPS ⇒ ∠PSR > ∠PSQ [from (i), (ii), (iii) and (iv)] |
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