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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Molecular formulae of some compounds are given. P) C3H8 Q) C3H4 R) C3H6 S) C3H8O (a) Which among the above is an alkane? (b) Write the general formula of the category of hydrocarbons to which Q belongs? (c) Write down the formula of the next homologue of R? |
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Answer» (a) P = C3H8 is an alkane. (b) Q belongs to CnH2n-2 (c) C4H8/ C2H4 |
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| 2. |
Which of the following is Synthetic Indicator?A. Turmeric B. Litmus Paper C. Methyl Orange D. Red Cabbage |
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Answer» Option : C. Methyl Orange |
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| 3. |
Hydrogen is an important fuel of future. (a) What are the chemicals used to prepare Hydrogen in the laboratory? (b) Write any one advantage of Hydrogen as a fuel? (c) Which chemical compound is known as heavy water? |
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Answer» (a) Chemicals used to prepare hydrogen in laboratory are Zn and dil. H2SO4. Zn + H2SO4 → ZnSO4 + H2 (b) Advantages of hydrogen as fuel : • It is highly efficient. • It does not produce harmful emissions. • It is readily available. (Any one) (c) Chemical Compound known as heavy water is D2O/Deuterium oxide. |
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| 4. |
At an under water depth of 400 feet, the pressure is `10 atm`. What should be the mole fraction of oxygen in dibing gas for partial pressure of oxygen in the mixture to be 0.2 atm, the same as in air at 1 atmA. `0.2`B. `0.02`C. `0.1`D. `0.4` |
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Answer» Correct Answer - B `P_(O_(2)) = X_(O_(2)) xx P_(T)` `X_(O_(2)) = (0.2)/(10) = 0.02` |
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| 5. |
Carbon dioxide reacts with water to form –A. Sulphuric acid B. Carbolic acid C. Carbonic acid D. Hydrochloric acid |
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Answer» Option : C. Carbonic acid |
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| 6. |
The correct order of boiling point is :A. `FH gt HCl gt Hbr gt HI`B. `HF gt HI gt HCl gt HBr`C. `HF gt HBr gt HI gt HCl`D. `HF gt HI gt HBr gt HCl` |
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Answer» Correct Answer - D `{:("Boiling point",HF,gt,HCl gt HBr gt ,HI),(,H-"bond",,"size"uarr ". Vander waal force",):}` `HF gt HI gt HBr gt HCl` |
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| 7. |
The chemical composition of Copper pyrite is –A. Cu2FeS B. CuFeS2 C. CuFe2S D. Cu2FeS2 |
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Answer» Option : B. CuFeS2 |
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| 8. |
If `0.2 mol` of `O_(2)` vapours can effuse from an opening in a heated vessel in 20 second how long will it take `8 gm H_(2) (g)` to effuse under same conditions.A. `600 sec`B. `100 sec`C. `400 sec`D. `200 sec` |
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Answer» Correct Answer - B `(r_(O_(2)))/(r_(H_(2))) = sqrt((M_(H_(2)))/(M_(O_(2))))` `((Delta n)/(t))_(o_(2))/(((Delta n)/(t))_(H_(2))) = sqrt((2)/(32))` `((0.2)/(20))/((4)/(t)) = sqrt((1)/(16))` `t = (400)/(4) = 100 sec` |
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| 9. |
Which of the following molecule does not exist in 3- D covalent solid form -A. Black phosphorousB. DiamondC. Silicon carbideD. Iodine |
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Answer» Correct Answer - D Iodine is molecular solid and rest are covalent solid compound |
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| 10. |
Consider the following reaction: `H_(2)O(l)toH_(2)O(g)" "DeltaH_(1)=44kJ` `2CH_(3)OH(l)+3O_(2)to4H_(2)O(l)+2CO_(2)(g)" "DeltaH_(2)=-1453kJ` What is the value of `DeltaH` for second reaction if water vapour instead of liquid water is formed as product?A. `-1409 kJ`B. `-1629kJ`C. `-1277kJ`D. none of these |
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Answer» Correct Answer - C `2CH_(3)OH(l)+3O_(2)to4H_(2)O(l)+2CO_(2)(g)+1453` ltbr. `underset(4xx44+4H_(2)Oto4H_(0)O)` `2CH_(2)OH(l)+3O_(2)(g)to4H_(2)O(l)+2CO_(2)(g)+1277` `DeltaH=-1277kJ` |
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| 11. |
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen and mthane. `2NH_(3) (g) + 3O_(2) (g) + 2CH_(4) (g) rarr 2HCN (g) + 6H_(2) O (g)` If `5 kg` of each reactant is used then what mass of `H_(2)O (g)` will be formed.A. `5.6 gm`B. `2.81 kg`C. `5.29 kg`D. `8.43 kg` |
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Answer» Correct Answer - C `{:(,2NH_(3) (g),+,3 O_(2) (g),+,2 CH_(4) (g),rarr,2 HCN (g),+,6 H_(2)O (g),),(,5 kg,,5 kg,,5 kg,,,,,),(n =,(5)/(17) K "mole",,(5)/(32) K "mole",,(5)/(16) K "mole",,,,,),(,O_(2) "is" LR,,,,,,,,,):}` Moles of `H_(2)O` formed `= (5)/(32) xx 2 xx 10^(3)` mole `= (5)/(16) K` mole Mass of water formed `= (5)/(16) xx 18 xx 10^(3) gm` `= 5.6 Kg` |
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| 12. |
At what temperature would `CO_(2)` molecule have an rms speed equal to `H_(2)` at `27^(@) C`.A. `4400 K`B. `2200 K`C. `6600K`D. `1100 K` |
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Answer» Correct Answer - C `rms_(CO_(2)) = rms_(H_(2))` `(sqrt((3RT)/(M)))_(CO_(2)) = (sqrt((3RT)/(M)))_(H_(2))` `(3 xx R xx T)/(44) = (3 xx R xx 300)/(2)` `T = 6600 K` |
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| 13. |
_______ is discovering unseen patterns from data.(a) Data Milling(b) Data Mining(c) Niching(d) Machine learning |
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Answer» Right answer is (b) Data Mining The best explanation: Data mining is the aim of discovering unseen patterns from data. Neural Networks are known to be universal function approximators. |
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| 14. |
Ion which has maximum tendency to accept the electrons -A. `O^(-)`B. `O^(-2)`C. `O^(+)`D. `O^(+2)` |
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Answer» Correct Answer - D `EA alpha +ve` charge |
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| 15. |
Which of the following statement can read csv files?(a) read.table(filename,header=TRUE,sep=’,’)(b) read.csv(filename,header=TRUE,sep=’,’)(c) read.tab(filename,header=TRUE,sep=’,’)(d) read.tab(filename,header=False,sep=’,’) |
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Answer» Correct option is (a) read.table(filename,header=TRUE,sep=’,’) Best explanation: Each row of the table appears as one line of the file. |
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| 16. |
Which of the following truncates real x to integers?(a) as.order(x)(b) as.integer(x)(c) as.numeric(x)(d) as.character(x) |
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Answer» Correct option is (b) as.integer(x) To elaborate: as.integer for object of class truncates decimal part of image values and then converts to type integer. |
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| 17. |
______ specializes in functions for analytical Customer Relationship Management.(a) adagio(b) ada(c) aCRM(d) adeg |
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Answer» Correct answer is (c) aCRM Easiest explanation: Convenience functions for data preparation and modeling are often used in aCRM. |
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| 18. |
Numbers in R are generally treated as _______ precision real numbers.(a) single(b) double(c) real(d) imaginary |
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Answer» Right answer is (b) double For explanation I would say: This means that even if you see a number like “1” or “2” in R, which you might think of as integers, they are likely represented behind the scenes as numeric objects something like “1.00” or “2.00”. |
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| 19. |
Point out the correct statement?(a) The data frame is a key data structure in statistics and in R(b) R has an internal implementation of data frames that is likely the one you will use most often(c) There are packages on CRAN that implement data frames via things like relational databases that allow you to operate on very very large data frames(d) All of the mentioned |
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Answer» Right option is (d) All of the mentioned Explanation: The basic structure of a data frame is that there is one observation per row and each column represents a variable, a measure, feature, or characteristic of that observation. |
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| 20. |
When you call serialize() on an R object, the output will be ____ coded in hexadecimal format.(a) raw vector(b) character vector(c) integer vector(d) binary vector |
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Answer» Right answer is (a) raw vector Easy explanation: When you call serialize() on an R object, the output will be raw vector coded in hexadecimal format. Serialize is used for converting an R object into a binary format for outputting to a connection. |
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| 21. |
The benefit of the _____ function is that it is the only way to perfectly repressed an R object in an exportable format, without losing precision or any metadata.(a) save()(b) save.image()(c) unserialize()(d) serialize() |
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Answer» Right answer is (d) serialize() Explanation: Unserialize is used for reading single R objects in the binary form. Serialize is used for converting an R object into a binary format for outputting to a connection (or file). |
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| 22. |
Which of the following package combine multi-dimensional arrays?(a) stringr(b) comb(c) abind(d) anlyz |
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Answer» Right choice is (c) abind The best explanation: This is a generalization of cbind and rbind. |
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| 23. |
______ specializes in converting data from wide to long format.(a) gcc(b) reshape(c) reshape2(d) gcc2 |
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Answer» The correct choice is (c) reshape2 The explanation: reshape2 is used in conjunction with ggplot2 and plyr. |
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| 24. |
Point out the correct statement?(a) “by.total” first subtracts out time spent in functions above the current function in the call stack(b) The summaryRprof() function calculates how much time is spend in which function(c) By default, the profiler samples the function call stack every 0.02 seconds(d) The Rprofiler() function starts the profiler in R |
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Answer» The correct option is (c) By default, the profiler samples the function call stack every 0.02 seconds For explanation I would say: Output of by.self is more useful than by.total for interpreting the data. |
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| 25. |
________ is used for translating between qplot and base graphics.(a) translate_qplot_base(b) translate_qplot_gpl(c) translate_qplot_lattice(d) translate_qplot_ggplot |
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Answer» Correct option is (a) translate_qplot_base The best I can explain: translate_qplot_gpl is used for translating between qplot and Graphics Production Library (GPL). |
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| 26. |
In syntax of linear model lm(formula,data,..), data refers to ______(a) Matrix(b) Vector(c) Array(d) List |
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Answer» Correct answer is (b) Vector To explain: Formula is just a symbol to show the relationship and is applied on data which is a vector. In General, data.frame are used for data. |
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| 27. |
Which of the following is a differentiation related aesthetic?(a) aes_position(b) aes_group_order(c) aes_linetype_size_shape(d) ggorder |
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Answer» Right choice is (c) aes_linetype_size_shape The best I can explain: aes_position is position related aesthetics. |
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| 28. |
What is the function to set column names for a matrix?(a) names()(b) colnames()(c) col.names()(d) column name cannot be set for a matrix |
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Answer» The correct option is (b) colnames() The explanation: colnames() is the function to set column names for a matrix. rownames() is the function to set row names for a matrix. But we can’t use both at a time. Column names and row names can be set separately using the colnames() and rownames() functions. |
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| 29. |
_________ is new package that makes it easy to “tidy” your data.(a) tidy(b) tidyr(c) tidyneat(d) tidynr |
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Answer» Correct choice is (c) tidyneat The explanation: Tidy data is data that’s easy to work in R. |
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| 30. |
Which programming language is more based on the results?(a) R(b) C(c) C++(d) Java |
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Answer» The correct choice is (a) R Easiest explanation: Compared to other programming languages, the R community tends to be more focussed on results instead of processes. Knowledge of software engineering best practice. |
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| 31. |
Point out the correct statement?(a) gather() makes “wide” data longer(b) Two functions are present for tidy data(c) separate() makes “wide” data longer(d) spread() function takes multiple columns |
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Answer» Right option is (c) separate() makes “wide” data longer The explanation is: Other names for gather include melt (reshape2), pivot (spreadsheets) and fold (databases). |
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| 32. |
Two important methods in analysis is differentiation and __________ transformation.(a) Bernoulli(b) Fourier(c) Bohr(d) Rutherford |
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Answer» Right choice is (b) Fourier To elaborate: Two important methods in the analysis is differentiation and Fourier transformation. Unfortunately, not all functions are differentiable or have a Fourier transform. |
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| 33. |
Point out the correct statement?(a) tidyr and dplyr packages do not make use of the pipe operator(b) tidyr does less than reshape2(c) tidyr provides ability to string multiple functions together by incorporating %(d) tidyr does greater than reshape2 |
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Answer» Right answer is (b) tidyr does less than reshape2 For explanation I would say: Just as reshape2 did less than reshape, tidyr does less than reshape2. |
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| 34. |
__________ is the best way for communicating the results of data analysis using the R language.(a) Single document(b) Files(c) Structures(d) Loadings |
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Answer» Right option is (a) Single document The best I can explain: The best possible way to do this is to combine the data, code and analysis results for a single document by knitr for reproducible research. This helps others to verify the findings, then engage in discussions. |
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| 35. |
What is the role of exploratory graphs in data analysis?(a) They are made for formal presentations(b) They are typically made very quickly(c) Axes, legends, and other details are clean and exactly detailed(d) They are used in place of formal modeling |
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Answer» Right answer is (b) They are typically made very quickly The explanation: EDA is used to summarize main characteristic of data. |
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| 36. |
Which of the following contains functions for processing uniaxial minute-to-minute accelerometer data?(a) accelerometry(b) abc(c) accrued(d) comb |
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Answer» The correct answer is (a) accelerometry For explanation: This package contains a collection of functions that perform operations on time-series accelerometer data, such as identify non-wear time, flag minutes that are part of an activity about, and find the maximum 10-minute average count value. |
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| 37. |
Which of the following is an R package for the exploratory analysis of genetic and genomic data?(a) adeg(b) adegenet(c) anc(d) abc |
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Answer» Right answer is (b) adegenet The explanation is: This package contains Classes and functions for genetic data analysis within the multivariate framework. |
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| 38. |
_________ searches for significant clusters in genetic data.(a) BayesCount(b) BayesComm(c) bayesclust(d) Bayescolcount |
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Answer» Right answer is (c) bayesclust Explanation: Bayesclust is an R package for testing and searching for significant clusters. BayesCount is used for power calculations and Bayesian analysis of count distributions and FECRT data using MCMC. |
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| 39. |
_________ are commonly introduced as representations of quantities that have magnitude and direction.(a) Lists(b) Data sets(c) Data frames(d) Vectors |
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Answer» Correct choice is (d) Vectors For explanation I would say: Vectors are commonly introduced as representations of quantities that have magnitude and direction. |
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| 40. |
To release a package to _____ you must pick a standard license.(a) R(b) CRAN(c) CRON(d) Studio |
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Answer» The correct answer is (b) CRAN The best explanation: To release your package to CRAN, you must pick a standard license. Otherwise, it’s difficult for CRAN to determine whether or not it’s legal to distribute your package. |
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| 41. |
A 10 litre box contains `O_3` and `O_2` at equilibrium at 2000 K. `K_p=4xx10^(14)` atm for `2O_3(g)hArr 3O_2(g)` Assume that `P_(O_2)gtgtP_(O_3)` and if total pressure is 8 atm, then partial pressure of `O_3` will be :A. `8xx10^(-6)`B. `22.62xx10^(-7)`C. `9.71xx10^(-6)`D. `9.71xx10^(-2)` |
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Answer» Correct Answer - B `DeltaG^@= -RT` In K=-2.3x2000x8.3 log K `(534.32xx10^3)/(2.3xx8.3xx2000)=log K` `K=10^14` `2O_3(g)hArr 3O_2(g) " " K=10^14` So `P_(O_3)ltltlt P_(O_2)` So`P_(O_2)+P_(O_3)=8` `P_(O_2)=8` atm `K=10^14=((P_(O_2))^3)/((P_(O_3))^2)=(8)^3/P(O_3)` `P_(O_3)=22.62xx10^(-7)` atm |
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| 42. |
_________ is used to convert wide data to long data.(a) melt(b) dcast(c) cast(d) rcast |
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Answer» Correct answer is (a) melt To explain I would say: dcast is used to go from long to wide. |
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| 43. |
___________ are the most commonly documented object.(a) Interface(b) Class(c) Functions(d) Libraries |
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Answer» Correct answer is (c) Functions The explanation is: Function is very most commonly documented object. The introduction block, most functions have three tags namely @param, @examples and @return. |
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| 44. |
Equilibrium constant for the given reaction is `K=10^(20)` at temperature 300 K `A(s)+2B(aq.)hArr2C(s)+D(aq.) K=10^20` The equilibrium conc. of B starting with mixture of 1 mole of A and `1//3` mole/litre of B at 300 K isA. `~4xx10^(-11)`B. `~2xx10^(-10)`C. `~2xx10^(-11)`D. `~10^(-11)` |
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Answer» Correct Answer - A `{:(,A(s)+,2B(aq)" "hArr,2C(s)+,D(aq)),("Initial",1,1/3,0,0),(At_(eq),1-x,underset(~~a)(1/3-x),2x,x):}` `x~~1//3` `10^(20)=(1/3)/[B]^2 " " implies 10^20=(1/3)/a^2" " implies a^2=1/(3xx10^20)=10^(-20)/3` `a=10^(-10)/sqrt3~~4xx10^(-11)M` |
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| 45. |
Which of the following convert a matrix of phi coefficients to polychoric correlations?(a) poly()(b) qline()(c) phi2poly(d) multi.plot() |
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Answer» Right answer is (c) phi2poly Explanation: In statistics, polychoric correlation is a technique for estimating the correlation between two theorized normally distributed continuous latent variables, from two observed ordinal variables. |
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| 46. |
`NH_4COONH_2 (s) hArr 2NH_3(g)+CO_(2)(g)` If equilibrium pressure is 6 atm for the above reaction, `K_p` will be :A. 32B. 27C. `4//27`D. `1//27` |
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Answer» Correct Answer - A `NH_4COONH_2(s)hArrunderset(2p)(2NH_(3)(g))+undersetp(CO_(2)(g))` 2p+p=6 p=2 atm `:. P_(NH_3)=4` atm , `P_(CO_2)=2` atm `K_(p)=[P_(NH_3)]^2[P_(CO_2)]=4^2xx2=32` |
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| 47. |
In a basic aqueous solution chloromethane undergoes a substitution reaction in which Cl is replaced by `OH^(-)` as. `CH_3Cl(aq)+OH^(-) hArrCH_3OH(aq)+Cl^(-)(aq)` The equilibrium constant of above reaction `K_c=1xx10^(16)`.If a solution is prepared by mixing equal volumes of 0.1 M `CH_3Cl` and 0.2M NaOH (100% dissociated) then `[OH^(-)]` concentration at equilibrium in mixture will be :A. 0.1 MB. 0.5 MC. 0.2 MD. 0.05 M |
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Answer» Correct Answer - D `{:(,CH_3Cl(aq)+,OH^(-)" "hArr,CH_3OH(aq)+,Cl^(-)(aq)),(t=0,0.05,0.1,0,0),(t_(eq),to0,0.1-0.05=0.05,0.05,0.05):}` At equilibrium constant is very large so reaction will be almost 100% complete. |
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| 48. |
Chlorine has great affinity for hydrogen. It reacts with compouns contaiing hydrogen to form `HCl`. Which of the following reaction/s gives/s `HCl`?A. `H_(2)O+Cl_(2)to`B. `H_(2)S+Cl_(2)to`C. `C_(10)H_(16)+8Cl_(2)to`D. `underset(("excess"))(NH_(3))+3Cl_(2)to` |
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Answer» Correct Answer - A::B::C (A) `H_(2) O+Cl_(2)to2HCl+O` (B) `H_(2)S+Cl_(2)to 2HCl+S` (C) `C_(10)H_(16)+8Cl_(2)to16HCl+10C` (D) `8NH_(3)+3Cl_(2)to6NH_(4)Cl+N_(2)` |
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| 49. |
Why does the son of a carrier mother and a normal father suffer from haemophilia, whereas the son of a haemophilic father and a normal mother would not? Explain. |
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| 50. |
What are parthenocarpic fruits? Mention one characteristic feature of such fruits. |
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Answer» The fruits that are formed without fertilisation of the ovary, are called parthenocarpic fruits.
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