Explore topic-wise InterviewSolutions in Current Affairs.

4 (YyRr, YyRr, YyRr, YyRr)

2 (YYRR, yyrr)

6 (YYrr, Yyrr, yyRR, yyRr, Yyrr, yyRr)

6 (YYrr, Yyrr, yyRR, Yyrr, yyRr, yyRr)

Correct option is (B) removing stamens before anthesis

Correct option is  B) —OH

15 (YYRR, YYRr, YyRR, YyRr, YYRr, YYrr, YyRr, Yyrr, YyRR, YyRr, yyRR, yyRr, YyRr, Yyrr, yyRr)

i) R – NH₂ 

ii) R – CONH₂

i Emasculation: Removal of stamens well before anthesis is called emasculation. It is done in bud condition to prevent self-pollination.

ii. Genome: Entire genetic constitution of an organism is called genome.

iii. Pure line: An individual or a group of individuals (population) that is homozygous or true breeding for one or more traits.

A group of atoms in carbon compounds showing characteristic properties is called a functional group.

i. Offsprings: The individuals produced by sexual reproduction are called offsprings.

ii. Progeny: All offsprings produced by the parents are called progeny.

iii. Hybrid: Heterozygous individual produced by parents having contrasting characters. e.g. Tt.

iv. Character: A visible feature is a character. e.g. height, seed colour.

v. Trait: One form of the visible feature. e.g. tallness or dwarfness, yellow or green.

vi. Homologous chromosomes or Homologues: Morphologically, physiologically and genetically similar chromosomes present in a diploid cell are called homologues or homologous chromosomes. In each pair of homologous chromosomes, one chromosome is maternal and the other is paternal.

Methyl alcohol

Functional group- Hetero atom or group of atoms attached to the carbon chain, which gives specific properties to the compounds, is called a functional group. 

(a) Aldehyde group, (b) Carboxylic acid

(i) 14 u

(ii) Two consecutive homologues differ by 1 carbon atom and 2 hydrogen atoms in their molecular formulae.

(a) Fuels which vaporise on heating, burn with a flame.

(b) Fuels which do not vaporise on heating, burn without a flame.

Correct option is  A) C₂H₅SH 

Carbon has the ability of bond with other atoms of carbons forming large chains, branches or rings. This property is called catenation.

Also, carbon has a valency of four and can combine with other elements such as hydrogen, oxygen, nitrogen, etc. Due to its small size, the bonds formed by carbon with other elements are very strong. Hence, carbon forms a wide variety of compounds.

Correct option is  B) 18

As per valence bond theory, the four unpaired electrons in a carbon atom is main cause to form many bonds.

Correct option is  A) Ethane

Ionic Bond is a type of chemical bond which exists between two oppositely charged species and the bond is mainly formed between electron donor element and electron acceptor element. 

Example- NaCl, KBr etc. 

In example of NaCl, Sodium atom donate one electron to chlorine atom to form ionic bond.

An element A has 4 valence electrons in its atom whereas element B has only one valence electron in its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed ? Give its electron-dot structure.

(a) A is a metal

(b) B and C are non-metals

(c) A and B combines to form an ionic bond.

(d) B and C combines to form a covalent bond.

(e) B will form an anion with valency 1 since it needs only 1 electron to complete its octet

(a) Covalent bond.

(b) Ionic bond .

(i) External fertilisation: Frog and fish 

(ii) Internal fertilisation: Dogs and cows.

The answer is (d) Y is a non-metal and Z is a metal

• Element Y has 3 electron in its outer which is electronegative in nature. 
• Z has 2 electrons in its outermost shell hence it is electropositive.
• Hence it is a metal.

1. a. Due to hydrogen gas

2. b. NO

3. a. Steam

4. b. FALSE

5. b. NO

(i) Fertilisation is defined as the fusion of a male gamete (sperm) with a female gamete (an ovum or egg) to form a zygote during sexual reproduction.

(ii) The site of fertilisation in human beings is in the fallopian tube of female reproductive system.

The answer is (b) Has low melting point

Here Z is an ionic compound and Ionic compounds have melting point hence option b) is a wrong statement.

1. c. 1

2. b. 7

3. a. L

4. b. 7

5. a. Ionic

A fire can be controlled or put out by removing one of the three things that are required to cause it. 

(i) Take away the fuel. If the fire has no fuel to feed on, no burning can take place. 

(ii) Prevent oxygen from reaching the fire. It will instantly stop. 

(iii) Bring down the temperature of the fuel below 'flash point'.

Some of the things we should do to prevent a fire at home and in the school: 

(i) We should stay alert while dealing with inflammable substances and handle them with care. 

(ii) There is always a possibility of fire in old buildings due to short circuits. Therefore, over loaded wires should be replaced with new ones and the fuse should be checked regularly. 

(iii) By creating awareness among the people regarding the handling of fuels, their flash points and their storage.Do not store inflammable or combustible things like kerosene and petrol at home or in schools. 

(iv) Fire extinguisher should be installed and old wiring must be replaced. 

(v)Keep the contact number of fire brigade and police on speed dial in case a little accident happens. 

(v) Never take any accidental fire lightly as it may lead to greater one.

(i) Fire is commonly used to cook food, to warm our homes in winter and to generate electricity. 

(ii) Fire is “a bad master” when it gets out of control as it becomes dangerous and causes destruction of life and property. It burns and destroys everything that comes in contact with it.

(i) The cat chased the mouse across the lawn. 

(ii) We were not allowed to cross the frontier. So we drove along it as far we could an came back happy. 

(iii) The horse went past the winning post and had to be stopped with difficulty. 

(iv) It is not difficult to see through your plan. Anyone can see your motive. 

(v) Go along the yellow line, then turn left. You will reach the post office in five minutes.

(i) You were required to keep all the doors open, not shut. 

(ii) Pupil: What mark did I get in yesterday's Maths test? Teacher: You got what you get when you add five and five and subtract ten from the total. 

(iii) Run four kilometres a day to preserve your health Run a lot to destroy it. 

(iv) If a doctor advises a lean and lanky patient to reduce his weight further, be sure he is doing it to increase his income. 

(v) The world is too much with us; late and soon. Getting and spending we lay waste our powers.

(i) Gandhiji's life was devoted to the cause of justice and fair play. 

(ii) Have you insured your house against fire? 

(iii) Diamond is nothing but carbon in its pure from. 

(iv) If you put to much coal on the fire at once you will smother it. 

(v) Smoking is said to be the main cause of heart disease. 

(vi) When asked by an ambitious writer whether he should put some fire into his stories, Somerset Maugham murmured, "No, the other way round". 

(vii) She is a carbon copy of her mother. 

(viii) It is often difficult to smother a yawn when you listen to as long speech on the value of time.

(iv) (ii) (iii) (i)

(i) Both assertion and reason are true and reason is the correct explanation of assertion. 

Fire is the result of a chemical reaction.

Some of the things we should do to prevent a fire at home and in school:

(i) Prevention is better than cure. We should be alert about the use of inflammable substances and handle it with care.

(ii) There is always a possibility of the outbreak of fire in an old building – whether a School or a Housing Complex – because of bared or faulty wiring. Therefore, over loaded wires should be replaced with new ones knd fuse should be checked at regular interval.

(iii) By spreading the knowledge about the handling of fuel, its flash point and about its protection sifter an accident.

(iv) Fire extinguisher should be installed and old wiring must be replaced. Keeping the contact number of the fire brigade in a ready-to-reach place is essential. Regular firedrill must be conducted in large buidlings.

(v) Never take minor cases of fire lightly as it may lead to greater one. We do not store inflammable or combustible things like kerosene or petrol in our homes and in school.

1. True

2. True

3. True

4. True

5. False

6. True

7. True

8. True

9. False

Correct option is fire.

C. it goes out of control.

D. Both ‘A’ and ‘B’

B. formed human chains.

D. Both ‘A’ and ‘B’

D. All of these three.

D. All of these three