Explore topic-wise InterviewSolutions in Current Affairs.

The Town Child 

The town child lives in a street full of buses, cars, producing a lot of noise and discharging smoke. The boy wishes to have meadows and lambs around. He hates those rows of houses filled with noises. He loves to have woods near. The only thing he loves in the town is the blue sky. He says the sky alone has room for him and lots of clouds.

The Country Child 

The country child lives close to a wood. The streets are quiet. The lanes are not crowded. The boy wants players all around. The trees are too tall and the boy feels lonely. He has the company of just birds and flowers. He wishes to have a home in a town. He loves to watch trams all around. He longs to see colourful lights glitter at nights. He prays to have town life.

I would prefer to live in a country. I like the greenery there. It is a pollution free place. People are innocent and courteous. It is always quiet and calm. Hence I like to live in a village.

a. be rapidly pumped back from sedimentation tank to aeration tank

D) oxidation

The country child’s wish is that he lived in a town.

Nights are colourful in towns because of the bright and twinkling streets. There are electric lights at night in towns.

The country child is able to watch meadows and iambs.

b. Production of CO₂

There are seven main categories of hierarchies namely, Kingdom, Phylum, Class, Order, Family, Genus and Species- Species is the basic unit of classification

1. It includes unicellular and few simple multicellular eukaryotes. 

2. It includes plant like protists (Algae) and animal like protists (protozoans)

If Lactose is withdrawn from the culture medium the operon is not induced or expressed.

Detailed answer:

If lactose is withdrawn from the culture medium the operon is not expressed. The repressor units with the operator gene and turns it off with the result the structural genes are inactivated and therefore the transcription and protein (enzyme) synthesis stops.

There are three structural genes (x, y, a) which transcribe a polycistronic mRNA. 

1. Gene z codes β-galactosidase (β-gal), which catalyses the hydrolysis of lactose into galactose and glucose. 

2. Gene y codes for permease, which increases the permeability of the cell to β-galactosidase (lactose). 

3. Gene a codes for transacetylase, which catalyses the transacetylation of lactose into its active form.

Viviparous animals, heterodont dentition.

Correct answer is (b) Liver fluke

(c) Coelenterata

ऐलिटेम उच्च क्षमता का कृत्रिम मधुरक है इसलिए इसका प्रयोग करने पर भोजन की मिठास को नियंत्रित करना कठिन होता है।

The RNA that carries amino acid sequence mRNA.

It is the sequence of base triplet in a DNA molecule which determines the sequence of amino acids in a polypeptide.

The triplet bases on mRNA that codes for a particular amino acid is called codon.

Deficiency of protein and vitamin is called hidden hunger because they cannot afford to buy enough fruits, vegetables, legumes, fish and meat.

The triplet base present on the tRNA which is complementary to codon on mRNA is called anticodon.

The polymerisation of amino acids to form polypeptide with the help of mRNA, ribosome, and tRNA is called translation.

The precursor RNA transcribed by RNA polymerase that contains both exons and introns.

The precursor of mRNA or the primary transcript transcribed by RNA polymerase II is called Heterogenous nuclear RNA.

(i) RNA can directly code for the synthesis of proteins and hence can easily express the character; it is the genetic material in many viruses. 

(ii) RNA can also act as a catalyst; there are some important biochemical reactions in living systems that are catalyzed by RNAs and not proteins. Many essential life processes like splicing, translation, etc. have evolved around RNA.

a is continuous synthesis. 

b is discontinuous synthesis.

 Correct Option is (B) produce identical gametes.

Diffusion of certain molecules with the help of protein molecules in the cell membrane is called facilitated diffusion.

In Active transport energy is needed by other process energy is not needed.

Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration but facilitated diffusion is the diffusion of certain molecules with the help of protein molecules in the cell membrane.

Sum of the number of protons and neutrons present in the nucleus is called Mass Number .

This model proposed that atom is considered as a uniform positively charged sphere and electrons are embedded in it.An important feature of Thomson model of an atom was that mass of atom is considered to be evenly spread over the atom. Thomson model of atom is also called as Plum pudding, raisin pudding or watermelon model Thomson model of atom was discarded because it could not explain certain experimental results like the scattering of α- particles by thin metal foils.

Yes, reversing the direction of acceleration will produce retardation. Consequently, the velocity will start decreasing with time but the direction of motion will be maintained till the velocity is reduced to zero and get reversed.

The molecules of an element are made of atoms of same element while the molecules of a compound are made of atoms of different elements.

Electron was identified by J.J. Thomson in the cathode ray tube experiment.

Yes,

An atom has internal structure. 

Different subatomic particles such as protons, electrons and neutrons constitute an atom. 

So, 

It is divisible.

Two observations which shows that atom is not indivisible are- 

(1). In J. J. Thomson’s experiment, the stream of cathode rays in the gas discharge tube shows the presence of negatively charged subatomic particles called electrons. 

(2). In Goldstein’s experiment, the faint red glow in the gas discharge tube shows the presence of positively charged subatomic particles called protons.

Isotones are atoms that have the same neutron number but different proton number. For example, ³⁶₁₆S, ³⁷₁₇Cl, ³⁸₁₈Ar, ³⁹₁₉K and ⁴⁰₂₀Ca are all isotones of 20 since they all contain 20 neutrons.

Isodiaphers — Nuclides having different atomic numbers and mass numbers but the same neutron excess, (the difference between numbers of neutrons and protons in the nucleus).

Isobars are elements that have the same number of nucleons (sum of protons and neutrons). The series of elements with 40 Mass number serves as a good example; ⁴⁰₁₆S, ⁴⁰₁₇Cl, ⁴⁰₁₈Ar, ⁴⁰₁₉K, and ⁴⁰₂₀Ca. 

Proton and neutron differs in – 

(1). Proton is positively charged while electron is negatively charged.

(2). Proton is much heavier than electron.

Absolute mass of electron is 9 x 10^-28 Kg.

Absolute charge on electron is 1.6 x 10^-19 C.

(a) Proton is present in same fixed no. in the atoms of any particular element. 

(b) Atomic no. is characteristic for any particular element.

Absolute mass of proton – 1.6x 10^-27 Kg 

Absolute charge of proton – 1.6 x 10^-19 C

Correct option is b. sp³, dsp², sp³d and sp² 

Tehri Dam is built on Ganga.

Heat is a form of energy which produces in us the sensation of hotness or coldness. According to dynamic theory, heat may be regarded as the energy of molecular motion which is equal to the sum total of the kinetic energy possessed by the molecules by virtue of their translation, vibrational and rotational motions.