All questions of October Week 2 for NEET Exam

Find the total voltage applied in a series RLC circuit when i=3mA, VL=30V, VC=18V and R=1000 ohms.

• a)
  Sedimentary rocks
• b)
  Igneous rocks
• c)
  Metamorphic rocks
• d)
  Any type of rock

• a)
  Stabilizing selection
• b)
  Directional selection
• c)
  Disruptive selection
• d)
  Abortion selection

• a)
  Phylogenetic trees
• b)
  Living fossils
• c)
  Comparative embryology
• d)
  Two fossil layers

• a)
  infinite
• b)
  3/4
• c)
  zero
• d)
  1

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  √2 A
• b)
  2√2 A
• c)
  2 A
• d)
  0 A

• a)
  Warning colouration
• b)
  Social insects
• c)
  Mullerianmimcry
• d)
  Camouflage

• a)
  Vegetative propagation
• b)
  Migration
• c)
  Mutation
• d)
  Genetic drift

• a)
  30°
• b)
  45°
• c)
  60°
• d)
  90°

• a)
  0.5 W
• b)
  0.05 W
• c)
  5 W
• d)
  50 W

• a)
  Migration
• b)
  Divergent evolution
• c)
  Adaptive radiation
• d)
  Natural selection

• a)
  concentration of substrate
• b)
  concentration of nucleophile
• c)
  nature of leaving group
• d)
  number of lone pairs on donor atom

• a)
  The rate of reaction increases on increasing strength of the nucleophile
• b)
  The reaction is faster in polar aprotic solvents
• c)
  The rate of reaction increases as the leaving group ability increases
• d)
  Ali'of the above

• a)
  Orangutan
• b)
  Chimpanzee
• c)
  Gibbon
• d)
  Gorilla

• a)
  Molecular theory
• b)
  Darwin theory
• c)
  Lamarck theory
• d)
  Big bang theory

• a)
  Homo erectus was much smaller in size than Homo sapiens
• b)
  Homo sapiens originated in Africa while Homo erectus was in Asia
• c)
  Homo erectus stayed in Africa while Homo sapiens did not
• d)
  The size of their brain of Homo erectus was smaller to homo sapiens

• a)
  the transition state proceeds and follow an unstable reaction intermediate
• b)
  the transition state will always have net negative charge
• c)
  existence of this state implies an exothermic reaction
• d)
  the single transition state represents the point of maximum free energy of the reaction

Consider the reaction given below.

Q. 

The correct statement(s) applicable to the above reaction is/are

• a)
  Cl^- is substituted predominantly
• b)
   Cl^- is a better leaving group
• c)
  substitution of I^- in the above reaction required greater activation energy than for Cl^-
• d)
  addition of some Nal catalyse the substitution reaction

• a)
  Neanderthal human
• b)
  Ramapithecus
• c)
  Cro-Magnon human
• d)
  Homo habilis

• a)
  Smaller head, less cranial capacity  
• b)
  Erect posture
• c)
  none
• d)
  Grasping hands

• a)
  Ramapithecus
• b)
  Dryopithecus
• c)
  Australopithecus
• d)
  Shivapithecus

• a)
  Natural selection
• b)
  Inheritance of acquired characters
• c)
  Descent with change
• d)
  Continuity of germplasm

• a)
  both nucleophile and leaving group are electron rich, nucleophilic attack occur from most distant position
• b)
  there is greater electron density on the back side of substrate
• c)
  there is not enough physical space in the front side from where leaving group leaves the substrate
• d)
  substrate possesses a hole in the backside

• a)
  I < II < III < IV
• b)
  III < II < I < IV
• c)
  II < III < IV < I
• d)
  II < I < III < IV

• a)
  0
• b)
  infinite
• c)
  E₀L₀ cos Ø
• d)
  E₀L₀

• a)
  Directional selection
• b)
  Disruptive selection
• c)
  Balancing selection
• d)
  Stabilising selection

• a)
  Homo erectus
• b)
  Hominidae
• c)
  Homo sapiens
• d)
  Homo habillis

• a)
  Neogenesis
• b)
  Anthropogenesis
• c)
  Metagenesis
• d)
  Fossilizes

• a)
  α-carbon is less crowded in 1-chlorobutane
• b)
  α-carbon is less electropositive in 1-chlorobutane
• c)
  electron donating inductive effect of three methyl group is greater in 2-chloro 2-methyl propane
• d)
  α-carbon is more electropositive in 1-chlorobutan

• a)
  the reaction mechanism involve atleast one reactive intermediate
• b)
  transition state is pentavalent
• c)
  product is formed after passing through several transition states
• d)
  nucleophile attacks from front side on which leaving group is present

• a)
  When all the alleles of a gene are present in a population in equal frequencies
• b)
  When the number of heterozygotes in a population are not equal to the number of either of the homozygote
• c)
  When the number of heterozygotes in a population are equal to the number of either of the homozygote
• d)
  When the frequency of particular genes or alleles remain constant in a population through generations

• a)
   Inter species variation
• b)
   Intraspecies variation
• c)
   Natural selection according to food
• d)
   Inheritance of acquired characters

• a)
  reaction involving stronger bond formation to α-carbon occur at faster rate
• b)
  reaction shows kinetic isotopic effect
• c)
  substitution of   lower the activation energy of reaction
• d)
  presence of electron withdrawing group in substrate increases reactivity

Comprehension Type

Direction (Q. Nos. 15-17) This section contains a paragraph, describing theory, experiments, data, etc. Three Questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

The general mechanism of a S_N2 reaction is as follows.

Factors that limit the rate of reaction are steric hindrance at α-cabron of substrate and strength of C—X bond. Any factor which stabilises transition state increases the rate of reaction.

Q. 

Consider the following S_N2 reaction,

Which of the following energy diagram is correctly labelled?

• a)
  
• b)
  
• c)
  
• d)
  

This diagram represents which selection?

• a)
  Disruptive selection
• b)
  Stabilizing selection
• c)
  Directional selection
• d)
  Artificial selection

Consider the following S_N2 reaction,

Q. 

Which of the following could increase the reactivity (rate) of reaction ?

• a)
  Increasing NaOH concentration
• b)
  Adding some Nal
• c)
  Replacing CHsBr by ¹⁴CH₃— Br
• d)
   Using NaO¹⁸ H in place of NaOH