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# JEE

## If the order of the matrix is m×n, then how many elements will there be in the matrix?a)mnb)m2 n2c)mn2d)2mnCorrect answer is option 'A'. Can you explain this answer?

The number of elements for a matrix with the order m×n is equal to mn, where m is the number of rows and n is the number of columns in the matrix.
Anuj Kumar asked   •  just now

## The points which shows the position of atoms in a crystal are called as _________.a)Crystal Latticeb)Crystal Parametersc)Bravais Latticed)Lattice PointCorrect answer is option 'D'. Can you explain this answer?

The point at which the atoms may be present on the unit cell is termed as lattice point. It shows the position of atoms in crystal.
Mehul Arya asked   •  2 minutes ago

## Among the following hydrocarbons which decolourise bromine water, but does not give precipitate with ammonical AgNO3 isa)CH4b)C2H4c)C2H2d)C2H6Correct answer is option 'B'. Can you explain this answer?

Prakash asked   •  2 minutes ago

## When x tends to 0 what about continuity of sin(1/x)?

Srinidhi Goudar asked   •  4 minutes ago

## It has been five years since I last ___ French.a)Was speakingb)Spokec)Have been speakingd)Have spokenCorrect answer is option 'B'. Can you explain this answer?

Abdullateef Olayiwola asked   •  6 minutes ago

## Which of the following acts in accordance with right hand screw rule?a)Polar vectorb)Axial vectorc)Displacement vectord)Position vectorCorrect answer is option 'B'. Can you explain this answer?

Shruti Gupta asked   •  10 minutes ago

## Needed a Test for resonance effect? Related: Resonance Structures?

Vinay Nagar asked   •  13 minutes ago

## Fossilisation isa)Organisms destroyed by scavengersb)Organism eaten by predatorsc)Animals buired and preserved by natural processd)Organisms destroyed by calamitiesCorrect answer is option 'C'. Can you explain this answer?

Alina Hasrat asked   •  17 minutes ago

## Find yn of y = sin²xcos²x?

Sangeeta Maheshwari asked   •  19 minutes ago

## 1/[x] 1/2[x]={x} 1/3?

Arya Parashar asked   •  19 minutes ago

## Which one of the following is a source of data for primary investigations?a)magazinesb)newspapersc)government publicationsd)questionnairesCorrect answer is option 'D'. Can you explain this answer?

Navin Sethiya asked   •  25 minutes ago

## Which of the following will not give iodoform test?a)Ethanolb)Ethanalc)Isopropyl alcohold)Benzyl alcoholCorrect answer is option 'D'. Can you explain this answer?

Mrudula Balla asked   •  25 minutes ago

## The power of a AM transmitter is 100 W. If the modulation index is 0.5 and the transmission is having single side band, the percentage of useful power is: A 1.1 W B 11 W C 2.2 W D 22 W?

Manish Kumar asked   •  26 minutes ago

## The solution of the differential equation x2dy - (x2 + 3xy + 4y2) dx = 0 is :a)b)c)d)Correct answer is option 'A'. Can you explain this answer?

Hari Priya Chamanthula asked   •  28 minutes ago

## Needed a Test for matrices? Related: Maths Class 11 - Notes, Questions, Videos & MCQs?

Raj Kali asked   •  29 minutes ago

## In the circuit in figure we have ε1 = ε2 = 100V, R1 = 20Ω, R2 = 10 Ω, R3 = 40 Ω and R4 = 30 Ω. Find the reading of the ammeter (in A). Disregard the resistance of the battery and the ammeter.Correct answer is '9'. Can you explain this answer?

Abhishek asked   •  32 minutes ago

## An ideal monoatomic gas at 27oC is compressed adiabatically to 8/27 times of its original volume. The increase in temperature of the gas isa)400oCb)375o Cc)350o Cd)300o CCorrect answer is option 'B'. Can you explain this answer?

Gyansingh Gurjar asked   •  33 minutes ago

## Needed a Test for matrix? Related: Mathematics (Maths) Class 12?

Mansi Behl asked   •  34 minutes ago

## The more readily fissionable isotope of uranium has an atomic mass ofa)238b)235c)236d)234Correct answer is option 'B'. Can you explain this answer?

Rai Bhavesh asked   •  37 minutes ago

## A body is allowed to slide on a frictional less track from rest under-gravity. The track ends in a circular loop of diameter D. What should be the minimum height of the body in terms of D, so that it may successfully complete the loop?a) 4D/5b) 5D/4c) Dd) 2DCorrect answer is option 'B'. Can you explain this answer?

Nikita Sona asked   •  41 minutes ago

## Let ABC and ABC' be two non-congruent triangles with sides AB = 4, AC = AC' = 2 2 and angle B = 30º. The absolute value of the difference between the areas of these triangles is[JEE 2009, 5]a)5b)4c)6d)3Correct answer is option 'B'. Can you explain this answer?

Borra Manikanta asked   •  49 minutes ago

## A metal ‘M’ burns in air to give a substance ‘x’ which on hydrolysis produce a gas ‘y’, which gives brown precipitate with alkaline . The metal ‘M’ can be i) Li ii) Mg iii) Na iv) K?

Anjali Sarda asked   •  51 minutes ago

## A house subtends a right angle on the window of its opposite house and the angle of elevation of the window from the foot of the former houses is 60o. If the distance between houses is 6 metres, then the height of the former house isa)6√3mb)8√3mc)4√3md)24mCorrect answer is option 'B'. Can you explain this answer?

Abhishek Choudhury asked   •  54 minutes ago

## If a circle passes through the point (a, b) and cuts the circle x2 + y2 = 4 orthogonally, then the locus of its centre is -              [AIEEE-2004]a)2ax + 2by + (a2 + b2 + 4) = 0b)2ax + 2by – (a2 + b2 + 4) = 0c)2ax – 2by + (a2 + b2 + 4) = 0d)2ax – 2by – (a2 + b2 + 4) = 0Correct answer is option 'B'. Can you explain this answer?

Borra Manikanta asked   •  54 minutes ago

## F* theta^ * is the angle between the circles passing through (lambda, 2lambda), (2lambda, lambda) and touching x-axis, the locus of the point from which pair of tangents drawn to the circle x ^ 2 y ^ 2 - 2x - 2y - 7 = 0 whi... more

Mansi Behl asked   •  56 minutes ago

## How many AM broadcast stations can be accommodated in a 150 KHz bandwidth if the highest frequency of modulation is 5 KHz ?a)2 b) 10c)15d)20Correct answer is option 'C'. Can you explain this answer?

Mansi Behl asked   •  57 minutes ago

## If f'(2) = 4 and f' (1) = 2 thena)3b)4c)-4d)Does not existCorrect answer is option 'B'. Can you explain this answer?

Josh Mathew asked   •  1 hour ago

## Two particles A and B start moving due to their mutual interaction only. If at any timet, aA and aB are their respective accelerations, vA and vB are their respective velocities, and up to that time WA and WB are the work done on A and B respectively by the mutual force, mA and mB are their masses respectively, then which of the following is always correct?a)   mAvA +mBvB=0b) vA+vB=0  c) WA+WB=0        d) aA+aB=0Correct answer is option 'A'. Can you explain this answer?

Abhas Jha asked   •  1 hour ago

## A spider and fly are on a glass sphere. as the fly moves on the surface, find the maximum area on the glass sphere for the spider to be able to see it?assume that radius radius of sphere is much larger than size of spider and... more

Bittu Boss8757 asked   •  1 hour ago

## A body travel 200cm in first 2 sec & 220cm in next 5s .calculate the velocity at the end of 7s from star?

Mansi Behl asked   •  1 hour ago

## The following statements relate to the adsorption of gases on a solid surface. Identify the incorrect statement among them:a)Enthalpy of adsorption is negativeb)Entropy of adsorption is negativec)On adsorption, the residual forces on the surface are increasedd)On adsorption decrease in surface energy appears as heatCorrect answer is option 'C'. Can you explain this answer?

Anjali Sarda asked   •  1 hour ago

## Which of the following compounds does not react with metallic sodium?a) CH₃CH(OH)CH₃ b) CH₃$―$O$―$CH₃ c) CH₃COOH d) C₂H₅OH Correct answer is option 'B'. Can you explain this answer?

Sumana Basu asked   •  1 hour ago

## Two wires of the same dimensions but resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination isa)√ρ₁ ρ₂b)ρ₁+ρ₂c)2(ρ₁+ρ₂)d)ρ₁+ρ₂/2Correct answer is option 'D'. Can you explain this answer?

Rajalaxmi Parida asked   •  1 hour ago

## Flash of light in dark inhibits flowering ina)SDPb)LDPc)LSDPd)DNPCorrect answer is option 'A'. Can you explain this answer?

Mohit Goswami asked   •  1 hour ago

## Solve integral of sinx +cosx / (sinx^4+ cosx^4) dx?

Mansi Behl asked   •  1 hour ago

## A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum? (i.e. distance between first minimum on either side of the central maximum)a)1.5 cmb)3.0 cmc)4.5 cmd)6.0 cmCorrect answer is option 'A'. Can you explain this answer?

Tommy Smith asked   •  1 hour ago

## What is the degeneracy of the level of the hydrogen atom that has the energy (-Rh÷9)?

Meenakshi Rajkumar asked   •  1 hour ago

## The part of human hind brain that is responsible for hand-eye coordination isa)cerebellumb)pons varoliic)medulla oblongatad)thalamusCorrect answer is option 'A'. Can you explain this answer?

Tarun Jan asked   •  1 hour ago

## Startegies needed for JEE main and advanced?

Awantika Gupta asked   •  1 hour ago

## Which of the following compounds on boiling with KMnO₄ and the subsequent acidification will not give benzoic acid ?a)Benzyl alcoholb)Acetophenonec)Anisoled)TolueneCorrect answer is option 'C'. Can you explain this answer?

Tejaswi Sharma asked   •  1 hour ago

## find out the values of ionic products kw of water at various temperatures. 323 Related: Solutions - Introduction and Types of solutions?

Mishika Jaiswal asked   •  1 hour ago

## 4gram of hydrocarbon on complete combustion gave 12 • 571 gram of CO2 and 5 •143 gram of water. What is the empirical formula of the hydrocarbona)CHb)CH2c)CH3d)C2H5Correct answer is option 'B'. Can you explain this answer?

Pratima Hatizar asked   •  1 hour ago

## After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000 dps after another 140 days. The initial activity of the sample in dps isa)3000b)6000c)9000d)24000Correct answer is option 'D'. Can you explain this answer?

Manaswini Krovvidy asked   •  1 hour ago

## Velamen takes part ina)Respirationb)Absorption of moisturec)Transpirationd)ProtectionCorrect answer is option 'B'. Can you explain this answer?

Mohit Goyal asked   •  1 hour ago

## A speed v given to a particle of charge q and mass M so that it moves toward another particle of charge 4q and mass 4m placed at rest initially. Particle A approaches B up to a closest distance. The speed of particle B at thi... more

Shalini Sihag asked   •  1 hour ago

## A triangular medium has varying refractive index n=n0+ax where x is the distance from origin?

O Kaif Sid asked   •  1 hour ago

## Let [x] denote the integral part of x ∈ R and g(x) = x – [x]. Let f(x) be any continuous function with f(0) = f(1) then the function h(x) = f(g(x))a)Has finitely many discontinuitiesb) Is continuous on Rc) Is discontinuous at some x = cd)Is a constant function.Correct answer is option 'B'. Can you explain this answer?

Mansi Behl asked   •  2 hours ago

## The electronic configuration of an element is 1s₂2s₂2p₆3s₂3p₆3d₁₀4s₂4p₃. Its properties would be similar to which of the following elements?a)Boronb)Nitrogenc)Oxygend)ChlorineCorrect answer is option 'B'. Can you explain this answer?

Nikhil Gupta asked   •  2 hours ago

## The e.m.f. of the cell at 298 K is 0.02905 volt. The the value of equilibrium constant for the cell reaction is a) b) c) d) Correct answer is option 'B'. Can you explain this answer?

Mansi Behl asked   •  2 hours ago

## If the Earth has no rotational motion, the weight of a person on the equator is W. Determine the speed with which the earth would have to rotate about its axis so that the person at the equator will weigh 3/4 W. Radius of the Earth is 6400 km and g=10 m/s2.a)1.1×10−3 rad/sb)0.83×10−3 rad/sc)0.63×10−3 rad/sd)0.28×10−3 rad/sCorrect answer is option 'B'. Can you explain this answer?

Parinda Rathod Rathod asked   •  2 hours ago

## If f be a function such that f (9) = 9 and f ‘ (9) = 3, then   is equal toa)9b)1c)3d)none of theseCorrect answer is option 'C'. Can you explain this answer?

Shibam Meher asked   •  2 hours ago

## multiplication theorem of probability Related: Multiplication theorem of Probability - Probability, Class 12, Math?

Nikki Sharma asked   •  2 hours ago

## Magnesium metal crystallizes in a face centred cubic lattice with edge length 0.58nm . Calculate the density of metal if it contains 0.6% frenkel defect and 0.3% Schottky defect?

Sourav Singh asked   •  2 hours ago

## dielectric constant Related: Coulomb's Law?

Pratima Hatizar asked   •  2 hours ago

## A 60 kg weight is dragged on a horizontal surface by a rope to 2 metres. If coefficient of friction is μ=0.5, the angle of rope with the surface is 60o and g=9.8 m/sec2, then work done isa)294 joulesb)315 joulesc)588 joulesd)197 joulesCorrect answer is option 'B'. Can you explain this answer?

O Kaif Sid asked   •  2 hours ago

## The volume of the solid obtained by rotating the ellipse (x²/a²) + (y²/b²) = 1 about axis of x isOptionsa)πa²bb)π - b²c)4/3πa²bd)4/3πab²Correct answer is option 'D'. Can you explain this answer?

Narendra Kumar Yejju asked   •  2 hours ago

## The cyanohydrin of a compound X on hydrolysis gives lactic acid; The X isa)HCHOb)CH₃CHOc)(CH₃)₂COd)None of theseCorrect answer is option 'B'. Can you explain this answer?

Keshav Kumar Singh asked   •  2 hours ago

## A solid cube is placed on a rough horizontal surface.the coefficient of friction between them is mu where mu is less than 1/2 a variable horizontal force is applied on the cube upper surface as shown the maximum acceleration ... more

Sourab Debnath asked   •  2 hours ago

## Needed a Test for Organic compounds nomenclature? Related: JEE Main Mock Test Series 2020 & Previous Year Papers?

Nikunj Deshmukh asked   •  2 hours ago

## Find the number of solution of equation 2x-32x?

Arya Jankar asked   •  2 hours ago

## Assuming right side to be positive x.determine the signs (positive or negative) of the position velocity and acceleration for the particle in figure.time interval for all displacement is same.?

Utkarsh Sinha asked   •  2 hours ago

## The number of ways in which nine boys and five girls can be arranged in two vans each having numbered seat,three in the front and five at the back such that at least four girls always sit together?

Dev Paliwal asked   •  2 hours ago

## A capacitance of 2uf is required in an electrical circuit across a potential difference of 1.0 kV.Alarge number of 1uf capacitors are available which can withstand a potential difference of not more than 300V. The minimum num... more

Borra Manikanta asked   •  2 hours ago

## A hollow sphere (mass m, Radius R) is put inside a hollow cone (mass m, radius 3R and semi-vertical Angle 300) as shown in the figure. The whole arrangement is rigidly fixed to ground at the apex of the cone . Both the sphere... more

Mansi Behl asked   •  2 hours ago

## Consider the following sequence of reactions The product (B) is a) b) c) d) Correct answer is option 'C'. Can you explain this answer?

Mansi Behl asked   •  2 hours ago

## A compound A with molecular formula C10H13Cl gives a white precipitate on adding silver nitrate solution. A on reacting with alcoholic KOH gives compound B as the main product. B on ozonolysis gives C and D. C gives Cannizaro reaction but not aldol condensation. D gives aldol condensation but not Cannizaro reaction. A is :a)b)c)d)Correct answer is option 'A'. Can you explain this answer?

Mansi Behl asked   •  2 hours ago

## Which of the following is a chiral molecule ?a)2-Butanone b) Butanalc)2- Methylbutanald) 2-Methyl-1-propanalCorrect answer is option 'C'. Can you explain this answer?

Mansi Behl asked   •  2 hours ago

## Consider the spring-mass system, with the mass submerged in water, as shown in the figure. The phase space diagram for one cycle of this system isa)b)c)d)Correct answer is option 'B'. Can you explain this answer?

Ritwick Banerjee asked   •  2 hours ago

## If f(x) =  then f(x) is (where { * } represents the fractional part function)a)Continuous at x = b) f(x) exists, but f is not continuous at x = c)f(x) does not existd)f(x) = 1Correct answer is option 'C'. Can you explain this answer?

Alokik Gupta asked   •  2 hours ago

## A mass M collides elastically with a stationary mass m. If M < m, then it is possible for M to bounce directly backwards. However, if M > m, then there is a maximum angle of deflection of M. Then angle isa)sin φ = M/mb)sin φ = m/Mc)tan φ = M/md)tan φ = m/MCorrect answer is option 'B'. Can you explain this answer?

Harsha Reddy asked   •  2 hours ago

## Graph of a/x +b/y=k?

Er. Lalit Kumar asked   •  3 hours ago

## mod of x<√5. b. mod of x>√5 c.y square<2. d. y square >2

Mukti Ray asked   •  3 hours ago

## The term independent of x in the expansion of a)12C424b)12C326c)−12C522d)12C6Correct answer is option 'A'. Can you explain this answer?

Paresh Dash asked   •  3 hours ago

## Needed a Document for organic? Related: BITSAT Subject Wise & Full Length Mock Tests?

Diljeet Lamba asked   •  3 hours ago

## A precipitate of AgCl and AgBr weighs 0.4066 g . on heating in a current of chlorine , the AgBr is converted to AgBr and the mixture loses 0.0725 g in weight , find the % of Chlorine in original solution.? Answer is 6.15% ple... more

Krishan Goyal asked   •  3 hours ago

## Which of the following has the highest electronegativity?a)Nab)Clc)Kd)BCorrect answer is option 'D'. Can you explain this answer?

Mansi Behl asked   •  3 hours ago

## Some polar crystal produce small electric current on heating. This phenomenon is calleda)Piezo electricity  b) Pyro electricityc) Ferro electricityd)Anti ferroelectricityCorrect answer is option 'B'. Can you explain this answer?

Navneet Raj asked   •  3 hours ago

## The density of Mercury is 13.6g/ml.calculate diameter of an atom of Mercury is occupying a cube of edge length equal to the the diameter of Mercury atom. Atomic Mass of Mercury 200.?

Vedha Varshini asked   •  3 hours ago

## Consider the following statements about sound passing through a gasA. The pressure of the gas at a point oscillates in timeB. The position of a small layer of the gas oscilates in timea)Both A and B are correctb) A is correct but B is wrongc)B is correct but A is wrongd)Both A and B are wrongCorrect answer is option 'A'. Can you explain this answer?

Ashwini Gouni asked   •  3 hours ago

## If pair of tangents are drawn from any point (P) on the circle x^2+ y^2=1 to the hyperbola x^2/2 -y^2/1 =1, such that locus of circumcentre of triangle formed by pair of tangents and chord of contact is.?

Sanjay Bodele asked   •  4 hours ago

## Two small drops of mercury each of radius r form a single large drop. The ratio of surface energy before and after this change is :a)1 : 2 1/3b)2 1/3 : 1c)2 : 1d)1 : 2Correct answer is option 'B'. Can you explain this answer?

Thunder asked   •  4 hours ago

## Rate law of reaction A gives product is rate = k [A] Graphically it is represented as hence the rate constant is?

Mansi Behl asked   •  4 hours ago

Jatin Grover asked   •  4 hours ago

## If 3i+4j and -5i+7j represent the sides of a triangle, then its area isa)41b)47c)41/2d)47/2Correct answer is option 'C'. Can you explain this answer?

Sujan Khan asked   •  4 hours ago

## Find time period of x-[x-B]?

Mansi Behl asked   •  4 hours ago

## Which of the following oxide of vanadium is most basic?a)VOb)VO₂c)V₂O₃d)V₂O₅Correct answer is option 'A'. Can you explain this answer?

The Maths World asked   •  4 hours ago

## Which of the following is logically equivalent to ∼(p↔q) ?a)(p∨q)∨(q∧p)b)(p∨q)∨(q∧∼p)c)(p∨∼q)∨(q∧∼p)d)none of theseCorrect answer is option 'C'. Can you explain this answer?

Shivansh Rai asked   •  4 hours ago

## A ray of light travelling in air is incident almost along y-axis on medium of variable refractive index at the origin. The refractive index of the medium changes according to the relation u=1 x^2.What is the light ray vector ... more

Satish Kumar asked   •  4 hours ago

## Find the value of sin 7.5*,cos7.5* and tan7.5*?

Mohit Punyani asked   •  4 hours ago

## Needed a Test for rigid body and dynamics? Related: How to Crack IIT-JEE In First Attempt?

Hashmita Shabbi asked   •  4 hours ago