JEE

The expression is a polynomial in x of degree

• a)
  7
• b)
  5
• c)
  4
• d)
  3

• a)
  12.5 ml of 0.1 M solution
• b)
  25 ml of 0.1 M solution
• c)
  25 ml of 0.2 M solution
• d)
  50 ml of 0.2 M solution

• a)
  (7 , ∞)
• b)
  (−∞,−7) ∪ (7,∞)
• c)
  (−∞,−7) ∩ (7,∞)
• d)
  none of these

• a)
  only momentum is conserved
• b)
  only kinetic energy is conserved
• c)
  neither momentum nor kinetic energy is conserved
• d)
  both momentum and kinetic energy are conserved

• A:

  4 min

• B:

  25 min

• C:

  15 min

• D:

  8 min

The answer is d.

• a)
  H₂ + I₂ → 2HI
• b)
  H₂ + F₂ → 2HF
• c)
  H₂ + Cl₂ → 2HCI
• d)
  H₂ + Br₂ → 2HBr

• a)
  sin²α
• b)
  cos²α
• c)
  tan²α
• d)
  cot²α

• a)
  2
• b)
  4
• c)
  6
• d)
  8

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion (A):
Reason (R): The non zero vectors are always linearly independent

• a)
  Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
• b)
  Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
• c)
  Assertion is true but Reason is false.
• d)
  Assertion is false but Reason is true.

• a)
  White
• b)
  Yellow
• c)
  Green
• d)
  Red

• a)
  1
• b)
  2
• c)
  3
• d)
  4

The solution of

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  a < 9
• b)
  a < 12
• c)
  a < 13
• d)
  a < 11

 For r = 0, 1, ...., 10 let A_r, B_r, C_r denote, respectively, the coefficient of x^r in the expansions of (1 + x)¹⁰, (1 + x)²⁰ and (1 + x)³⁰. Then  is equal to       [JEE 2010]

• a)
   B₁₀ - C₁₀
• b)
  
• c)
  0
• d)
  C₁₀ - B₁₀

• a)
  25 mm
• b)
  40 mm
• c)
  27.8 mm
• d)
  30.3 mm

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  Bulk modulus
• b)
  Elastic modulus
• c)
  Modulus of rigidity
• d)
  None of these

• a)
  bar diagram
• b)
  pie diagram
• c)
  histogram
• d)
  frequency polygon

A point charge q is placed in space. Consider an arbitrary shaped Gaussian surface which is divided into two parts I and II by an imaginary plane as shown in figure. For this situation mark out the correct statement(s).

• a)
  Electric flux crossing through II is +ve and through I is -ve.
• b)
  Electric flux crossing through II is -ve and through I is +ve.
• c)
  Electric flux through I and II are equal and opposite.
• d)
  Both (b) and (c) are correct.

• a)
  –COOH group
• b)
  –OH group of the sugar unit
• c)
  –OH goup of the heterocyclic base
• d)
  –OH group of the phosphate unit

• a)
  CH₃OH +(CH₃)₃CI
• b)
  CH₃I +(CH₃)₃COH
• c)
  CH₃I +(CH₃)₃CI
• d)
  None of these

• a)
  14.5
• b)
  5
• c)
  9
• d)
  4.5

• a)
  ax − by = aq − bp
• b)
  bx − ay = ap − bq
• c)
  bx − ay = bp − aq
• d)
  ax − by = bq − ap

• a)
  [ML ²T -3 I ^-1 ]
• b)
  [ML ²T ^-2 ]
• c)
  [ML ²T ^-1 I ^-1 ]
• d)
  [ML ²T ^-3 I ^-2 ]

• a)
  Piezo electricity
  

   
  
• b)
  Pyro electricity
• c)
  Ferro electricity
• d)
  Anti ferroelectricity

• a)
  8.4 kJ
• b)
  4.2 kJ
• c)
  16.7 kJ
• d)
  167.4 kJ

• a)
  Asinwt/L
• b)
  2Asinwt/L
• c)
  3Asinwt/L
• d)
  4Asinwt/L

• a)
  x = − 3
• b)
  y = − 1
• c)
  x = 3
• d)
  y = 1

• a)
  Electron-withdrawing inductive effect of the carbonyl group in -COOH group weakens the O-H bond and favours ionisation of a carboxylic acid compared with an alcohol
• b)
  Inductive effect of the chlorine destabilises the acid and stabilises the conjugate base
• c)
  Aniline is a weaker base than ammonia
• d)
  Phenol is a weaker acid than water

• a)
  6 m−s⁻¹
• b)
  8 m−s⁻¹
• c)
  10 m−s⁻¹
• d)
  16 m−s⁻¹

• a)
  BrF₅
• b)
  SF₆
• c)
  [CrF₆]³⁻
• d)
  PF₅

• a)
  Ethanoic acid
• b)
  Methanoic acid
• c)
  Benzoic acid
• d)
  Carbolic acid

• a)
  a² log 2
• b)
  2a² log 2
• c)
  a log 2
• d)
  2a log 2

• a)
  The reaction follows first order kinetics
• b)
  The t₁∕₂ of reaction depends on initial concentration of reactants
• c)
  k is constant for the reaction at a constant temperature
• d)
  The rate law provides a simple way of predicting the conc. of reactants and products at any time after the start of the reaction

The solution set for : 

• a)
  (−∞,−2) ∪ (−1,1) ∪ (2,∞)
• b)
  (−∞,−2) ∪ (2,∞)
• c)
  (-2 , 2)
• d)
  (−1,2) ∪ (3,∞)

• a)
  normal elements
• b)
  transition elements
• c)
  inner-transition elements
• d)
  metals containing full d-orbitals

• a)
  an ellipse with eccentricity 2/√5
• b)
  an ellipse with the length of major axis 6
• c)
  a hyperbola with eccentricity √5
• d)
  a hyperbola with the length of conjugate axis 3

• a)
  a pair of parallel lines
• b)
  a pair of planes at right angles
• c)
  a plane
• d)
  a pair of straight lines

• a)
  The radius r +/r - increases as coordination number increases
• b)
  As the difference in size of ions increases coordination number increases
• c)
  When coordination number is eight, the r +/r - ratio lies between 0.225 to 0.414
• d)
  In ionic solid of the type AX(ZnS, Wurtzite) the coordination number of Zn 2+ and S 2- respectively are 4 a

• a)
  Na₃[CrCl₆]
• b)
  [Cr(H₂O)₅Cl]Cl₂
• c)
  [Cr(H₂O)₆]Cl₃
• d)
  Na₂[CrCl₅(H2O)]

• a)
  [FeCl₄]^– has tetrahedral geometry.
• b)
  [Co(en)(NH₃)₂Cl₂]⁺ has 2 geometrical isomers.
• c)
  [FeCl₄]^– has higher spin-only magnetic moment than [Co(en)(NH₃)₂Cl₂]⁺.  
• d)
  The cobalt ion in [Co(en)(NH₃)₂Cl₂]⁺ has sp³d² hybridization. 

• a)
  232/990
• b)
  232/9990
• c)
  232/9900
• d)
  232/9909

• a)
  Electromagnet
• b)
  Core of transformer
• c)
  Core of dynamo
• d)
  Magnet of loudspeaker

• a)
  Papaver somniferum
• b)
  Cannabis sativus
• c)
  Aconitum napellus
• d)
  Dalbergia sissoo

• a)
  (at², 2at)
• b)
  (at², –2at)
• c)
  (asin²t, 2asint)
• d)
  (asint, 2acost)

• a)
  Baluster
• b)
  Nosing
• c)
  Peak
• d)
  Newel

reacts with as
The change in oxidation number of Cr is

• a)
  6
• b)
  3
  
• c)
  zero
• d)
  4

• a)
  Both A and R are true and R is the correct explanation of A
• b)
  Both A and R are true and R is not the correct explanation of A
• c)
  A is true but R is false
• d)
  A is false but R is true

• a)
  ababc
• b)
  abcaa
• c)
  accab
• d)
  bacaa

• a)
  
• b)
  NaOH
• c)
  
• d)
  

• a)
  φ₂- φ₁ /ε₀ 
• b)
  φ₁+ φ₂ /ε₀ 
• c)
  φ₁- φ₂ /ε₀ 
• d)
  (φ₁+ φ₂)ε₀