Explore topic-wise InterviewSolutions in Current Affairs.

(a) similar origin but disimilar functions 

Minute structures on bacterial cell are called 

(d) pili

(d) pollen grain

(a) A chromosome is a single large macromolecule of DNA, and constitutes a physically organized form of DNA in a cell. It is a very long, continuous piece of DNA (a single DNA molecule), which contains many genes, regulatory elements and other intervening nucleotide sequences.

Correct option: d) Chemical waste

(i) (a) 

(ii) (a) 

(iii) (b) 

(iv) (b) 

(v) (d)

Correct option: a) Hospital staff

(b) Both assertion and reason is true, but reason is not the correct explanation of assertion

(c) Assertion may be true, but reason is false as we cannot say which trait is dominant or recessive unless we know the genotype of these variants of the trait.

(i) Quantitative aspect : This aspect is related to the availability of water resources. The availability of water resources varies over space and time mainly due to variations in seasonal and annual precipitation. However, water scarcity in most cases is caused by over-exploitation, excessive use and unequal access to water among different social groups. 

(ii) Qualitative aspect : Now, let us consider another situation where water is sufficiently available to meet the needs of the people, but, the area still suffers from water scarcity. This scarcity may be due to bad quality of water. Lately, there has been a growing concern that even if there is ample water to meet the needs of the people, much of it may be polluted by domestic and industrial wastes, chemicals, pesticides and fertilizers used in agriculture, thus, making it hazardous for human use.

The total energy consumed by the refrigerator in 30 days
= 400 × 8 × 30 = 96000 Wh = 96 kWh
The total energy consumed by the iron box in 30 days
=750 × 2 × 30 = 45000 Wh = 45 kWh
The total energy consumed by the refrigerator and iron box is
= 96 kWh + 45 kWh = 141 kWh
The sum of bill amount for 141 kWh at rate of Rs. 3 per 1 kWh is
=141 × 3 = Rs. 423

Correct option is B. exons appear but introns do not appear in the mature RNA

Correct option is B. 5′ (upstream) end and 3′ (downstream) end, respectively of the transcription unit

Washing Soda

(i)  It is used as cleansing agent for domestic purposes.

(ii)  It is used in softening of hard water and controlling the pH of water.

Baking Soda

(i)  It is used in the manufacture of baking powder. Baking powder is a mixture of potassium hydrogen tartarate and sodium bicarbonate. During the preparation of bread the evolution of carbon dioxide causes bread to rise (swell).

(ii)  It is largely used in the treatment of acid spillage and in medicine as soda bicarbonate, which acts as an antacid.

In metals, the electrons in the outer most shells are loosely bound to the nucleus. Even at room temperature, there are a large number of free electrons which are moving inside the metal in a random manner.

 (i)   CaOCl₂

(ii)  CaSO₄. 1/2 H₂O

• The incident ray, reflected ray and normal to the reflecting surface all are coplanar (ie. lie in the same plane). 
• The angle of incidence i is equal to the angle of reflection r. i = r

It may be defined as a reaction between acid and base present in aqueous solution to form salt and water.

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

(i) Different forms of organisms or life have evolved during the course of evolution. Classification deals with grouping of there organisms into groups and subgroups based on their similarities and differences.

(ii) The characteristics commonly seen in any two species will be closely related and they will be closely related and they will have a more recent or common ancestor.

(iii) Thus, classification helps tracing the evolutionary relationships between the two organisms. Hence it can be said that classification and evolution are interlinked.

(a) Milk is made slightly alkaline so that it may not get sour easily, due to the formation of lactic acid in it.
(b) The alkaline milk takes a longer time to set into curd because the lactic acid formed has to first neutralise the alkali present in it.

1. Carbon dioxide: Air, through stomata.

2. Water: Soil through roots.

3. Sunlight: From the sun, present in green parts of the body absorbed by chlorophyll molecules plant body.

The filament of an electric bulb is usually made of tungsten because of its higher resistivity value (5.56 × 10 Ω m) and its high melting point (3422°C).

Correct option is A) had better go to bed

Given:

Number of students in the class = 100

Number of students passed in Chemistry = 70

Number of students passed in Physics = 50

Number of students failed in both Physics and Chemistry = 10

Calculation:

Let the number of students passed in both the subjects Physics and Chemistry be S

Total Students = Number of students passed in Chemistry  + Number of students passed in Physics + Number of students failed in both Physics and Chemistry – Number of students passed in both the subjects Physics and Chemistry

100 = 70 + 50 + 10 – S

⇒ S = 130 – 100

⇒ S = 30

∴ The number of students passed in Both the subjects Physics and chemistry are 30

\(\because\) 1 < 4, 1 < 5, 2 < 4, 2 < 5, 3 < 5, 4 < 5.

Let R be 'less than' relation A to B.

\(\therefore\) R = {(a, b) | a € A , b € B such that a < b}

= {(1,4), (1,5), (2,4), (2,5), (3,4), (3,5), (4,5)}

(i) The collection of all months of a year beginning with the letter J is a well-defined collection of objects because one can definitely identify a month that belongs to this collection.
Hence, this collection is a set.

(ii) The collection of ten most talented writers of India is not a well-defined collection because the criteria for determining a writer's talent may vary from person to person.

Hence, this collection is not a set.

(iii) A team of eleven best cricket batsmen of the world is not a well-defined collection because the criteria for determining a batsman's talent may vary from person to person.
Hence, this collection is not a set.

(iv) The collection of all boys in your class is a well-defined collection because, you can definitely identify a boy who belongs to this collection.
Hence, this collection is a set.

(v) The collection of all natural numbers less than 100 is a well-defined collection because one can definitely identify a number that belongs to this collection.
Hence, this collection is a set.

(vi) A collection of novels written by the writer Munshi Prem Chand is a well-defined collection because one can definitely identify a book that belongs to this collection.
Hence, this collection is a set.

(vii) The collection of all even integers is a well-defined collection because one can definitely identify an even integer that belongs to this collection.
Hence, this collection is a set.

(viii) The collection of questions in this chapter is a well-defined collection because one can definitely identify a question that belongs to this chapter.
Hence, this collection is a set.

(ix) The collection of most dangerous animals of the world is not a well-defined collection because that criteria for determining the dangerousness of an animal can vary from animal to animal.
Hence, this collection is not a set.

2)

(i) 5∈A, as 5 is the 5th element in set A.
(ii) 8∈/A, as 8 is not present in set A.
(iii) 0∈/A, as 0 is not present in set A.
(iv) 4∈A,  as 4 is the 4th element in set A.
(v) 2∈A, as 2 is the 2nd element in set A.
(vi) 10∈/A as 10 is not present in set A.

1. 

(i) The collection of all months of a year beginning with the letter J is a well-defined collection of objects because one can definitely identify a month that belongs to this collection.

Hence, this collection is a set.

(ii) The collection of ten most talented writers of India is not a well-defined collection because the criteria for determining a writer’s talent may vary from person to person.

Hence, this collection is not a set.

(iii) A team of eleven best cricket batsmen of the world is not a well-defined collection because the criteria for determining a batsman’s talent may vary from person to person.

Hence, this collection is not a set.

(iv) The collection of all boys in your class is a well-defined collection because you can definitely identify a boy who belongs to this collection.

Hence, this collection is a set.

(v) The collection of all natural numbers less than 100 is a well-defined collection because one can definitely identify a number that belongs to this collection.

Hence, this collection is a set.

(vi) A collection of novels written by the writer Munshi Prem Chand is a well-defined collection because one can definitely identify a book that belongs to this collection.

Hence, this collection is a set.

(vii) The collection of all even integers is a well-defined collection because one can definitely identify an even integer that belongs to this collection.

Hence, this collection is a set.

(viii) The collection of questions in this chapter is a well-defined collection because one can definitely identify a question that belongs to this chapter.

Hence, this collection is a set.

(ix) The collection of the most dangerous animals of the world is not a well-defined collection because the criteria for determining the dangerousness of an animal can vary from person to person.

Hence, this collection is not a set.

2. If the element belongs to A we write ∈,else ∉

(i) 5 ∈ A, as 5 is the 5th element in set A.

(ii) 8 ∉ A, as 8 is not present in set A.

(iii) 0 ∉ A, as 0 is not present in set A.

(iv) 4 ∈ A,  as 4 is the 4th element in set A.

(v) 2 ∈ A, as 2 is the 2nd element in set A.

(vi) 10 ∉ A as 10 is not present in set A.

Correct option is B) She is possibly

A type of chemical reaction in which a single product is formed from two or more reactants is known as chemical combination reaction.

(B) increases production and income of the watershed community.

The path of light is visible in beaker 'A’ because, the particles present in milk scatters the light passed it.

(i) c) Reflex arc,
(ii) f) cerebellum,
(iii) g) Fore brain,
(iv) a) peripheral nervous system.

For a good source of energy, following conditions must be fullfilled by it: 

(i)  It should provide large amount of useful energy.

(ii)  It must be easily storable in small space.

(iii)  It must be easily transportable.

(iv)  It must provide the energy in regular manner.

(v)  It should be convenient to use 

The number of electric field lines crossing a given area kept normal to the electric field lines  is called electric flux. Its unit is N m² C^-1 . Electric flux is a scalar quantity.

Correct answer is (c) Parrot fish

Let n(A) = m 

n[P(A)] = 16 

⇒ 2m = 16 

⇒ m= 4 

n(A)= 4

Advantages of using a solar cooker : 

• They directly utilize solar energy 

• They need no maintenance. 

 • They do not cause pollution.

Lack of accumulation of carbon dioxide gas in between the cake layers is the reason for the hardness and small size of the cake.

(1 + i)/(1 - i) = (1 + i)²/(1 - i) = 2i/2 = i Modulus of i = 1

The answer is (B) Q

(A) Real and Inverted

Properties of Magnetic field lines :

(I)  They form closed continuous curves. They repel each other and are in a state of tension

 (II)  Externally, they move from north pole of a magnet to its south pole.

(III)  Inside the magnet they move from south pole to north pole.