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Transcript of Aglasem Online Test
7/27/2019 Aglasem Online Test
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KVPY Class 12 Test
User: GovindStarted On: 19 Oct 2013, 16:16:43Total Score: 60/240
Subject: Physics (Attempted Ques)
Subject: Chemistry (Attempted Ques)
Question 1:
Correct Answer: 1
Your Answer: 1
Solution Steps:
Question 2:
Correct Answer: K<SUB>1</SUB>K<SUB>2</SUB><SUP>2</SUP>
Your Answer: K<SUB>1</SUB>K<SUB>2</SUB><SUP>2</SUP>
Solution Steps:
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Question 3: Doping silicon with boron produces a :
Correct Answer: p-type semiconductor
Your Answer: n-type semiconductor
Solution Steps: Doping with trivalent impuring produces p-type semiconductor.
Question 4: For a one-electron atom, the set of allowed quantum numbers is :
Correct Answer:
Your Answer:
Question 5: Typical electronic energy gaps in molecules are about 1.0 eV. In terms of temperature, the gap is
closest to :
Correct Answer: 10<sup>3</sup> K
Your Answer: 10<sup>3</sup> K
Solution Steps:
Question 6:
Correct Answer: 0
Your Answer: 3
Solution Steps: All ligands are neutral.
Question 7:
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Correct Answer: 4
Your Answer: 1
Solution Steps:
Question 8:
Correct Answer: 3
Your Answer: 3
Solution Steps: Staggered is most stable
Question 9: For a tetrahedral complex [MCl<sub>4</sub>]<sup>2–</sup>, the spin-only magnetic moments is
3.83 BM. The element M is :
Correct Answer: Co
Your Answer: Co
Solution Steps:
Question 10: The C–O bond length in CO, CO<sub>2</sub>, and CO<sub>3</sub><sup>2–</sup> follows the
order :
Correct Answer: CO < <sub>2</sub> < CO<sub>3</sub><sup>2–</sup>
Your Answer: CO > CO<sub>2</sub> > CO<sub>3</sub><sup>2–</sup>
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Solution Steps: As decided by bond orderCO < CO<sub>2</sub> < CO<sub>3</sub><sup>2–</sup>
Question 11: The isoelectronic pair of ions is :
Correct Answer: Mn<sup>2+</sup> and Fe<sup>3+</sup>
Your Answer: Mn<sup>3+</sup>and Fe<sup>2+</sup>
Solution Steps: Both have 24 electrons.
Subject: Mathematics (Attempted Ques)
Subject: Biology (Attempted Ques)
Question 1: A reflex action is a quick involuntary response to stimulus. Which of the following is an example of
BOTH, unconditioned and conditioned reflex ?
Correct Answer: secretion of saliva in response to the aroma of food
Your Answer: secretion of saliva in response to the aroma of food
Solution Steps: Secretion of saliva in response to the aroma of food could be both unconditional and conditional
reflex.
Question 2: The disorders that arise when the immune system destroys ‘self’ cells are called autoimmune
disorders.
Which of the following would be classified under this ?
Correct Answer: rheumatioid arthritis
Your Answer: rheumatioid arthritis
Solution Steps: Rhematioid arthritis is an autoimmune disease while rhinits, asthma and eczema are inflammatorydisease
of, mucous membrane inside nose, bronchioles and epidermis respectively.
Question 3: Peptic ulcers are caused by :
Correct Answer: a bacterium Helicobacter pylori
Your Answer: a bacterium Helicobacter pylori
Solution Steps: Helicobacter pylori previously named compylobacter pyloridis, is a gram – negative bacteria found instomach, causes peptic ulcers.
Question 4: Vitamin A deficiency leads to night-blindness. Which of the following is the reason for the disease ?
Correct Answer: rhodopsin pigment of rod cells is defective
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Your Answer: rhodopsin pigment of rod cells is defective
Solution Steps: Vitamins A is structural component of visual pigment. “Rhodopsin”, vitamin A deficiency may leads tonightblindness because rhodopsin pigment of rod cells become defective.
Question 5: Diabetes insipidus is due to :
Correct Answer: hyposecretion of vasopressin
Your Answer: hypersecretion of vasopressin
Solution Steps: Vasopressin or ADH hormone induce reabsorption of water in DCT and collecting duct of nephron.It’shyposecretion may cause frequent urination which is also called Diabetes insipidus.
Question 6: Which of the following is true TCA cycle in eukaryotes ?
Correct Answer: takes place in mitochondrion
Your Answer: takes place in mitochondrion
Solution Steps: Kreb Cycle/TCA cycle in eukaryotes takes place in mitochondria.
Question 7: In mammals, the hormones secreted by the pituitary, the master gland, is itself regulated by the
pituitary, the master gland, is itself regulated by :
Correct Answer: hypothalamus
Your Answer: hypothalamus
Solution Steps: Secretion of hormones by the pituitary gland is regulated by a part of brain “hypothalamus”.
Question 8: Which of the following class of immunoglobulin can trigger the complement cascade ?
Correct Answer: IgM
Your Answer: IgA
Solution Steps: Classical complement pathway comprising of 21 different serum proteins primarily activated byantibodymolecules of either IgG or IgM.
Question 9: Fossils are most often in which kind of rocks ?
Correct Answer: sedimentary rocks
Your Answer: sedimentary rocks
Solution Steps: Fossils are most often found in Sedimentary kind of rocks.
Question 10: DNA mutations that do not cause any functional change in the protein product are known as :
Correct Answer: silent mutations
Your Answer: silent mutations
Solution Steps: Silent mutations are DNA mutations that do not result in a change to the amino acid sequence of a
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protein.
Question 11: Transfer RNA (tRNA)
Correct Answer: usually has clover leaf-like structure
Your Answer: codes for proteins
Solution Steps: rRNA is present in the ribosomes and mRNA carries genetic information from DNA and codes forprotein,while tRNA carries amino acids at site of protein synthesis and also have clover leaf-like sturcture
Question 12: By which of the following mechanisms is glucose reabsorbed from the glomerular filtrate by the
kideny tubule ?
Correct Answer: diffusion
Your Answer: diffusion
Solution Steps: In kidney tubule PCT, 100% glucose from glomerular filtrate is reabsorbed by diffusion.
Question 13: A ripe mango, kept with unripe mangoes causes their ripening. This is due to the release of a
gaseous plant hormone.
Correct Answer: ethylene
Your Answer: ethylene
Solution Steps: Ethylene is only gaseous plant hormone that induce ripening of fruit.
Question 14: A hormone molecule binds to a specific protein on the plasma membrane inducing a signal. The
protein it binds to is called :
Correct Answer: receptor
Your Answer: receptor
Solution Steps: Proteins on plasma membrane to which hormone molecules bind is called receptor.
Question 15: In a food chain such as grass --> deer --> lion, the energy cost of respiration as a proportion of total
assimilated energy at each level would be :
Correct Answer: 30%- 30% - 30%
Your Answer: 30%- 30% - 30%
Solution Steps: According to 10% low at each tropic leve 90% of assimilated energy is lost in respiration and only10% ispass on the next level so respiration energy loss would be constant at each tropic level.
Question 16: Plant roots are usually devoid of chlorophyll and cannot perform photosynthesis. However, there are
exceptions. Which of the following plant root can perform photosynthesis ?
Correct Answer: Tinospora
Your Answer: Tinospora
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Solution Steps: Some plants develop green, chlorophyll containing roots along with colourless roots, these greenrootsperform photosynthesise.g. – Trapa and Tinospora
Question 17: Some animals excrete uric acid in urine (uricotelic) as it requires very little water loss. Which animals
among the following are most likely to be uricotelic ?
Correct Answer: birds
Your Answer: birds
Solution Steps: Birds are uricotelic.
Question 18: In Dengue virus infection, patients often develop haemorrhagic fever due to internal bleeding. This
happens due to the reduction of :
Correct Answer: platelets
Your Answer: platelets
Solution Steps: Haemorrhagic fever in dengue virus infection may cause internal bleeding due to the reduction ofplatelets.
Question 19: Human chromosomes undergo structural changes during the cell cycle. Chromosomal structure can
be best visualized if a chromosome is isolated from a cell at :
Correct Answer: M phase
Your Answer: M phase
Solution Steps: Chromosomal structure can be best visualized in metaphase of M Phase .
Question 20: If the sequence of bases in sense strand of DNA is 5’ – GTTCATCG-3’, then the sequence of bases
in its RNA transcript would be :
Correct Answer: 5’-GUUCAUCG-3’
Your Answer: 5’-GUUCAUCG-3’
Solution Steps: Transcribed RNA is exactly like that of the sense strand of DNA2
DNA --> 51 - GTTCATCG – 3’RNA --> 51 – GUUCAUCG – 3’
Question 21: In cattle, the coat colour red and white are two dominant traits, which express equally in F1 to
produce roan (red and white colour in equal proportion). If F1 progeny are self-bred, the resulting
progeny in F2 will
have phenotypic ratio (red : roan : white) is :
Correct Answer: 1 : 2 : 1
Your Answer: 1 : 2 : 1
Solution Steps:
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Question 22: Insects constitute the largest animals group on earth. About 25-30% of the insect species are known
to be herbivores. In spite of such huge herbivore pressure, globally, green plants have persisted.
One possible reason for this persistence is :
Correct Answer: herbivore population has been kept in control by predators
Your Answer: herbivore population has been kept in control by predators
Solution Steps: Herbivore population has bee kept in control by predators.
Question 23: Insectivorous plants that mostly grow on swampy soil use insects as a source of :
Correct Answer: nitrogen
Your Answer: nitrogen
Solution Steps: Insectivorous plants use insects as source of nitrogen.
Question 24: The roots of some higher plants get associated with a fungal partner. The roots provide food to the
fungus while the funus supplies water to the roots. The structure so formed is known as
Correct Answer: mycorrhiza
Your Answer: mycorrhiza
Question 25: Persons suffering from hypertension (high blood pressure) are advised a low-salt diet because :
Correct Answer: high salt leads to water retention in the blood that further increases the blood pressure
Your Answer: high salt leads to water retention in the blood that further increases the blood pressure
Solution Steps: High salt leads to water retention in the blood that increases blood volume and further increases thebloodpressure.
Question 26: The following sequence contains the open reading frame of a polypeptide. How many amino acids
will the polypeptide consist of ?
5’-AGCATATGATCGTTTCTCTGCTTTGAACT-3’
Correct Answer: 7
Your Answer: 7
Solution Steps: The following sequence contains the open reading frame of a polypeptide. How many amino acidswill thepolypeptide consist of ?5’-AGCATATGATCGTTTCTCTGCTTTGAACT-3’
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Question 27: Vibrio cholerae cuases cholera in humans. Ganga water was once used successfully to combat the
infection. The possible reason could be :
Correct Answer: presence of antibiotics in Ganga water
Your Answer: presence of bacteriophages in Ganga waterSolution Steps: Ganga water may possibly contain antibiotic that may kill vibrio cholerae bacteria certainly.
Question 28: When hydrogen peroxide is applied on the wound as a disinfectant, there is frothing at the site of
injury, which is due to the presence of an enzyme in the skin that sues hydrogen peroxide as a
substrate to produce :
Correct Answer: oxygen
Your Answer: oxygen
Solution Steps: Peroxidase enzyme use hydrogen peroxide as a substrate to produce oxygen that cause frothing at
thesite of injury.
Question 29:
Correct Answer: 1
Your Answer: 1
Solution Steps: On starting fast glucose level decreased and than remain constant as glucose began to mobilize
fromstored glycogen in liver and then further decreased.
Question 30: Which one of the following is true about enzyme catalysis ?
Correct Answer: the activation barrier of the process is lower in the presence of an enzyme
Your Answer: the activation barrier of the process is lower in the presence of an enzyme
Solution Steps: Enzyme serve as biocatalyst, it increases rate of a biological reaction by decreasing activationenergy.
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