CBSE Questions for Class 11 Commerce Economics Use Of Statistical Tools Quiz 2 - MCQExams.com

How do we differentiate between Fe3+Fe3+ and Cr3+Cr3+ in group III?
  • By taking excess of NH4OHNH4OH
  • By increasing NH+4NH+4 ion cocentration
  • By decreasing OHOH ion concentration
  • Both (b) and (c)
Which one of the following processes will produce hard water ?
  • Saturation of water with CaCO3CaCO3
  • Saturation of water with MgCO3MgCO3
  • Saturation of water with MgSO4MgSO4
  • none of the above
In presence of HCl(aq.);H2SHCl(aq.);H2S gas results the precipitation of group-2 cations but not of group-4 cations during qualitative analysis. It is due to:
  • Lower concentration of S2S2
  • Higher concentration of S2S2
  • Lower concentration of H+H+
  • Higher concentration of H+H+
Two swimmers, at opposite ends of a 9090 m pool, start to swim the length of the pool, one at the end rate of 33 m per second, the other at 22 m per second. They swim back and forth for 1212 minutes. Allowing no loss of time at the turns, find the number of times they pass each other.
  • 2424
  • 2121
  • 2020
  • 1919
  • 1818
Fill in the blanks from the alternatives given in the brackets.
Random sampling is sampling by _________.
  • chance
  • choice
  • purpose
  • quota
The Additive Model of a time series is expressed as :
  • Yt=Tt×Ct×St×RYt=Tt×Ct×St×R
  • Yt=TtCtStRtYt=TtCtStRt
  • Yt=Tt+Ct+St+RtYt=Tt+Ct+St+Rt
  • Yt=TtCtStRtYt=TtCtStRt
Sun temple is situated in which of the following States>
  • Assam
  • Odisha
  • Jammu and Kashmir
  • Madhya Pradesh
The extreme values of the classes are called _________.
  • class-mark
  • tally mark
  • class-limit
  • class-frequency
________ is the difference between the upper and the lower limit of the class.
  • Class Interval
  • Class Tally
  • Class Frequency
  • Class Mark
A specific characteristic of a population is known as a __________.
  • Sample
  • Parameter
  • Statistic
  • Descriptive statistic
Time series is an important statistical technique which is widely used by __________.
  • business executives
  • financial analysts
  • economists
  • all of above
The maximum value a correlation coefficient can have is
  • 0
  • -1
  • 1
  • 0.1
Lottery method is an example of _______ sampling.
  • deliberate
  • random
  • census
  • None of these

Isopropylamine can be obtained by  

  • (CH3)2C=O+NH3?(CH3)2C=O+NH3?
  • (CH3)2CO+NH3(CH3)2CO+NH3
  • (CH3)2CHBr+NaNH2(CH3)2CHBr+NaNH2
  • (CH3)2CHBr?(CH3)2CHBr?
Prussian blue colour is obtained by mixing together an aqueous solution of Fe3+Fe3+ salt with:
  • ferricyanide
  • ferrocyanide
  • hydrogen cyanide
  • sodium cyanide
Which of the following reagents is used for the separation of acetaldehyde from acetophenone? 
  • NH2OH
  • NaOHI2
  • NaHSO3
  • C6H5NHNH2
The Multiplicative Model of a time series is expressed is :
  • Yt=Tt×Ct×St×R
  • Yt=TtCtStRt
  • Yt=Tt+Ct+St+Rt
  • Yt=TtCtStRt
In Lassaigne's method organic compound is fused with: 
  • sodium metal
  • zinc dust
  • sodium caronate and zinc dust
  • calcium metal
Chromyl chloride gives yellow ppt. when it reacts with respectively_________
  • Cu(OH)2,PbNO3
  • NaOH,(CH2COO)2Ca
  • NaOH,(CH3COOO)2Pb
  • KOH,PbSO4
To prevent frauds in multiple mortgage cases, under SARFAESI Act, 2002, one special thing has been created and made operative from 01-04-Which one is that from the following? 
  • Special Register Office at Lucknow
  • Special Central Arbitration Bureau at Lucknow
  • Central SARFAESI Tribunals at six centres
  • Central Electronic Registry
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