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Motion in which an object travels along a straight line is called rectilinear motion.

• Displacement is the shortest distance between the initial and final points of movement. 
• Distance is the actual path followed by a body between the points in which it moves.

As terminal velocity is proportional to X and Y will be 4 : 1.

Correct option is A) always

Correct option is B) infinity

Correct option is A) 30°

(A) Temperature

(D) Equatorial

The conductor referred to Valli ‘Madam’ as she behaved like a grown up and did not think that she was a child. She also refused his help and told him that she can manage on her own.

The temperatures decrease when moving to high altitudes.

Kolkata is far away from the sea.

(a) It is the largest unit of time. 1 century = 100 years.

(b) It is the smallest unit of time, 1 shake = 10^-8 sec.

(c) It is the time taken by the moon to complete one revolution around the earth. 1 lunar month = 9.53 days.

(d) A year which is divisible by 4 and in which the month of February is of 29 days is called leap year.

(e) The year in which total solar eclipse takes place is called topical year.

B) decreases 6°C

(a) Candela (cd) 

(b) Kelvin (K) 

(c) Radian (rd) 

(d) Ampere (A) 

(e) Mole (mol) 

(f) Steradian (Sr) 

(g) N/m² = pascal (pa)

The dimensional part in the expression is (ρr⁴/ηl).Therefore, the dimensions of the right hand side comes out to be

([ML^-1 T^-2 ][L⁴ ]/[ML^-1 T^-2 ][L]) = [L³]/[T], which is volume upon time. Hence, the formula is dimensionally correct.

(i) l represents azimuthal quantum number while L represents second shell of atom.

(ii) N^3-

No. of protons = 7

No. of electrons = 7+3 = 10

No. of neutrons = 14-7 = 7

The dimensional part in the expression is \(\frac{Pr^4}{nl}\).

Therefore, the dimensions of the right-hand side come out to be \(\frac{[ML^{-1}T^2][L^4]}{[ML^{-1}][L][T]}=\frac{[L^3]}{[T]}\), 

Which is volume upon time. As [V] = \(\frac{L^3}{T}\),the formula is dimensional correct, because LHS = RHS.

(b) Parsec

(d) Light year

Charge = -1.6022 x 10^-19C ;  Mass =  9.109 x 10^-31kg

Mass spectrograph.

Because, bodies differ in order of magnitude significantly in respect to the same physical quantity. For example, interatomic distances are of the order of angstroms, inter-city distances are of the order of km, and interstellar distances are of the order of light year.

It is defined as mass exactly equal to 1/12^th the mass of one atom of carbon-12 isotope. 

Methane (CH₄) and Carbon dioxide (CO₂)

(a)  nano 

(b)  pico

(a) Kilogram ((Kg) 

(b) metre (m) 

(c) second(s) 

(d) Kelvin(K) 

(e) Ampere(A) 

(f) Candela(Cd) 

(g) mole(mol) 

(h) Mass/ volume(Kg/m³)

To distinguish between a hard boiled egg and a raw egg, we spin each on a table top. The egg which spins at a slower rate shall be raw. This is because in a raw egg, liquid matter inside tries to get away from its axis of rotation. Therefore, its moment of inertia increases. As t = I α = constant, therefore,α decreases i.e. raw egg will spin with smaller angular acceleration. The reverse is true for a hard boiled egg which will rotate more or less like a rigid body.

No change in speed, but there can be change in the direction of motion.

No. According to Newton’s third law, for every action, there is an equal and opposite reaction. So, whatever case we consider, if there is an action there is always a reaction. So it is impossible.

Whn a ray of light, travelling from an optically denser medium into an optically rarer medium is incident at an angle greater than the critical angle for the two media ,the ray is totally reflected back into the medium , obeying the laws of reflection.This phenomenon is called total internal reflection.
The two conditions for total internal reflection :
1. The ray of light must travel from a denser medium into a rarer medium.
2. The angle of incidence in the denser medium must be greater than the critical angle for that pair of media.

Let in new system, dimensions be M', L' and T'

Given : 100 M'L'T'^-2 = 100 MLT ^-2   ..(1)

20 M'L'²T'^-2 = (20)(100 ML²T^-2)  ..(2)

Solving (1) and (2), L' = 100L

M'T'^-2 = MT^-2 / 100

10 surface tension (MT^-2) in SI unit = 10³ M'T'^-2

^{ANS: 1000}

(A) TtRr

TtRr genotype represents a true dihybrid condition.

(A) 0%

When a homozygous dominant (AA) is crossed with homozygous recessive (aa) in F1 generation heterozygous dominant (Aa) is obtained which does not resemble any of the parents genotypically.

DNA backbone is somewhat tilted from its vertical axis, it has two uneven grooves or furrowings i.e., one major groove (about 12 A˚) and one minor groove (about 6 A˚). They are the protein binding sites of DNA.

Polymorphism It is the occurrence of more than one form of genetic material
Types →

• Allelic polymorphism – multiple alleles in a gene. So it alters structure and function of protein formed.
• SNP or single nucleotide Polymorphism – Unique in every human being. Useful in locating specific alleles, disease associated sequences.
• RFLP or Restriction Fragment Length polymorphism – Different sized fragments are formed by cleavage with same enzyme most RFPL have no effect on phenotypes.

The mutation in which addition/insertion or deletion of one or two bases changes the reading frame from the site of mutation is called frameshift mutation. It may result in polypeptide with different sequences of amino acid. A disease caused by frameshift mutation is muscular dystrophy

Lactose binds to repressor molecule and prevents it from binding with the operator, as a result RNA polymerase binds to promoter-operator region to transcribe the structural genes. Thus the lac operon is switched on.

Relationship between the sequence of nucleotides or bases on mRNA and the sequence of amino acids in the polypeptide.

Science of handling, storing as databases, analysing, modelling and providing access to various aspects of biological information, especially molecules connected with genomies and proteomics
Applications

• Organisation of Biological Data
• Functional Genomics
• Proteomics, Pharmacogenomics
• Medical informatics, chemoinformatics
• Faster drey research.

Mutation in which addition/insertion or deletion of one or two bases changes the reading frame from the site of mutation is called frameshift mutation. It may result in polypeptide with different sequences of amino acids. Disease caused by frameshift mutation - sickle-cell anemia.

Application of Human genome project :

• Identification of defective genes.
• Opportunity to offer early treatment.
• Identification of genes that confer susceptibility to certain disease.
• Prediction of protein that the genes produce.
• Drug designing to enhance or inhibit the activities of the proteins. 

DNA – Deoxy ribonucleic acid RNA – Ribo nucleic acid tRNA – transfer – RNA

The salient features of genetic code are as follows: 

(i) The codon is triplet. 61 codons code for amino acids and 3 codons do not code for any amino acids, hence they function as stop codons. 

(ii) One codon codes for only one amino acid, hence, it is unambiguous and specific. 

(iii) Some amino acids are coded by more than one codon, hence the code is degenerate. 

(iv) The codon is read in mRNA in a contiguous fashion. There are no punctuations. 

(v) The code is nearly universal: for example, from bacteria to human UUU would code for Phenylalanine (phe). Some exceptions to this rule have been found in mitochondrial codons, and in some protozoans. 

(vi) AUG has dual functions. It codes for Methionine (met) , and it also act as initiator codon. 

Correct answer is

(D) both (A) and (B)

(C) at the same locus of the chromosome.

Multiple alleles are present at the same locus of the chromosome.

Correct answer is

(B) test cross

(A) (i) and (iii) are true

During a cross between yellow round (YYRR) and green wrinkled (yyrr), (i) and (iii) are true.

Correct answer is

(C) both (A) and (B)

 Correct Option is (B) YyRr

Difference between Phenotype and Genotype :