Explore topic-wise InterviewSolutions in Current Affairs.

Option : (B)

A cone has two surfaces, 

(i) Curved surface 

(ii) Circular base

We have, 

r = 6.3 cm, 

h = 10 cm

∴ l = \(\sqrt{r^2+h^2}\) cm

= \(\sqrt{(6.3)^2+100}\) cm

= \(\sqrt{139.69}\) cm

= 11.82 cm

Now, 

Volume = \(\frac{1}{3}\)×\(\frac{22}{7}\)×(6.3)²×10 cm³

= 415.8 cm³

Curved surface area = \(\frac{22}{7}\)×6.3×11.82 cm²

= 234.03 cm²

We have, 

Radius of the base of the cone =14/2 = 7 cm 

Height of the cone = 14 cm 

∴ Volume of the cone = \(\frac{1}{3}\)×\(\frac{22}{7}\)×7²×14 cm³ 

= 718.66 cm³

For largest circular cone radius of the base of the cone = 1/2 edge of cube

= 1/2 x 14 = 7 cm

And height of the cone = 14 cm

Volume of cone = 1/3 x 3.14 x 7 x x 14

= 718.666 cm³

A two-letter word is to be formed out of the letters of the word SPACE.

(i) When repetition of the letters is allowed 1st letter can be selected in 5 ways. 2nd letter can be selected in 5 ways.

∴ By using the fundamental principle of multiplication,

the total number of 2-letter words = 5 × 5 = 25

(ii) When repetition of the letters is not allowed 1st letter can be selected in 5 ways. 2nd letter can be selected in 4 ways.

∴ By using the fundamental principle of multiplication,

the total number of 2-letter words = 5 × 4 = 20

A three-digit number is to be formed from the digits 0, 1, 3, 5, 6.

(i) When repetition of digits is allowed, 100’s place digit should be a non-zero number.

Hence, it can be anyone from digits 1, 3, 5,6.

∴ 100’s place digit can be selected in 4 ways.

10’s and unit’s place digit can be zero and digits can be repeated.

∴ 10’s place digit can be selected in 5 ways and the unit’s place digit can be selected in 5 ways.

∴ By using the fundamental principle of multiplication,

the total number of three-digit numbers = 4 × 5 × 5 = 100

(ii) When repetition of digits is not allowed, 100’s place digit should be a non-zero number.

Hence, it can be anyone from digits 1, 3, 5, 6.

∴ 100’s place digit can be selected in 4 ways. 10’s and unit’s place digit can be zero and digits can’t be repeated.

∴ 10’s place digit can be selected in 4 ways and the unit’s place digit can be selected in 3 ways.

∴ By using the fundamental principle of multiplication,

the total number of two-digit numbers = 4 × 4 × 3 = 48

Solution : 

1. d 

2. c 

3. a 

4. e 

5. b

The correct answer is : (a) Helium

False

Atomicity of phosphorus (P₄) is 4 and atomicity of sulphur (S₈) is 8. Hence, the given statement is wrong.

The relative atomic mass of an element is defined as the average mass of the atom, as compared to 1/12^th the mass of one-carbon atom. Relative atomic mass of sulphur is 32 means the average mass of the sulphur atom is found with respect to an atom of carbon-12.

Average atomic mass of chlorine is 35.

(a) Oxygen = 2 

(b) Ozone = 3 

(c) Neon = 1 

(d) Sulphur = 8 

(e) Phosphorus = 4 

(f) Sodium = 1

The substances which get vapourised during burning gives flames. Charcoal while burning do not vapourise and so does not produce a flame while burning.

The correct answer is : (d) Berzelius

Saturated solution: The solution in which the amount of solute dissolved is equal to solubility

Law of constant proportion or law of definite proportion states that in a chemical compound, elements always combine in a fixed proportion.

The correct answer is : (b) Neon

i. The symbol of aluminium is Al.

ii. The symbol of cobalt is Co. 

iii. The symbol of arsenic is As. 

iv. The symbol of radon is Rn.

Unsaturated solution: The solution in which solute is less than the solvent.

Supersaturated solutIon: The solution in which the solute dissolved is more than its solubility

12g. of carbon contains 6.022 x 10²³  atoms.

mass of 1 atom = \(\frac{12}{6.022\,\times\,10^{23}}= 1.99 \times\,10^{-23} g.\)

Law of constant proportion: A given chemical substance always contains the same elements combined in a fixed proportion by weight.

Formula: Formula is the shortest form to represent a compound.

The correct answer is : (d) 8:1

The correct answer is : (d) So

The correct answer is : (b) 1:16

Molar mass is the mass of one mole of any substance. One mole of any species (atoms, molecules, ions or particles) is that quantity in number having a mass equal to its atomic or molecules mass in grams. 

Molar mass is represented by “M”

Number of moles (n) = \(\frac{Given\,mass\,(m)}{Molar\,mass\,(M)}\)

we can write,

Molar mass (M) = mass (m) × Number of moles(n)

Law of conservation of mass: This law states that “atoms are neither created nor destroyed in a chemical reaction”. 

This means that the total mass of the products formed in chemical reaction must be equal to the mass of reactants consumed. 

Carbon + oxygen → CO₂ 

Mass of carbon = 12g 

Mass of oxygen = 32g 

Mass of CO₂ =? 

According to the law of conservation of mass, 

Sum of masses of reactants = Sum of masses of of products 

Hence, 12g + 32g = 44g 

Thus, the amount of CO₂ formed is 44g.

Given: 

Mass of He (m) = 52g 

Atomic mass of He = 4u 

Molar mass of He (M) = 4g/mol 

To calculate the number of moles, we will apply the formula given below: 

Number of moles = \(\frac{Given\,mass\,(m)}{Molar\,mass\,(M)}\)

Number of moles = \(\frac{52g}{4g/mol}\)

Number of moles = 13 

Thus, the number of moles in 52 g of He is 13.

Formula unit mass of CuSO₄.5H₂O:

Atomic mass of Cu + Atomic mass of S + (4× atomic mass of O) + 5 (2× atomic mass of H + atomic mass of O) 

63.5 u + 32 u + 4× 16u + 5 (2 × 1 u + 16 u) 

63.5 u + 32 u + 64 u + 90 u 

249.5 u 

Thus, the formula unit mass of CuSO₄.5H₂O is 249.5 u

Reticulate venation.

Endosperm stores the food.

(a) Ilango Adigal

1. developed – development

2. preserved – preservation

3. similar – similarity

4. pleasant – pleasantness.

Yes, I do. I go to a drawing class regularly and my teacher says I am quite good at it. I also participate in drawing competitions and have won many prizes.

• Runaway: (win (a prize) easily) The talented students of that school run away with all prizes.
• Rundown: (knockdown with a vehicle) My brother was in danger of being run down by a speedy car.
• Run into:(meet by Chance) I run into my long-lost friend in the market.
• Run out: (use up or be used up) Ramesh couldn’t send the article timely because he runs out of paper.
• Run around: (search) I am running around for a good house.
• Go about: (begin or carry on work) Since the deadline is approaching, I have to go about my work without wasting my time.
• Go away: (go or vanish) After his father’s accident, fears about his future refused to go away from Ramu’s mind.
• Go ahead: (permission to proceed) I don’t mind at all Go ahead and have more servings of the dessert.
• Go through: (experience, suffer) During the recession, we had to go through a tough period.
• Go along: (agree to, suit something) These curtains do not go along with the rich upholstery.
• Go into: (investigate or inquire into) When the police went into the details of the case, they realized that the son himself was the murderer of the father.
• Take aback: (surprise) I was taken aback when. the stranger walked straight into my house and settled down on the sofa. 
• Take off: remove (clothing), become airborne Why don’t you take off your coat: It is very warm inside.
• Take on: (undertake [a task], acquire [a particular meaning or quality] The competition for the president’s post has taken on a warlike quality.
• Take over: (assume control or responsibility for) When she saw that I was ill, my mother took over the work of preparing lunch.

1. of 

2. from 

3. with 

4. with 

5. of 

6. O 

7. on 

8. for / from 

9. on 10. at 

11. with 

12. to 

13. of 

14. about 

15. to 

16. for 

17. to 

18. with 

19. to 

20. off

1. a, the

2. the

3. the, a

4. O, the , the

5. O

6. The, the 

7. the, the 

8. the, O

9. the, a 

10. the, O

11. O, the

12. O, O

13. O, O 

14. AO, the 

15. O, a, O

1. a

2. a 

3. a 

4. a, an 

5. a 

6. a 

7. an 

8. a 

9. a 

10. an 

11. an 

12. an 

13. an 

14. an

15. a

Travel agent: Hello Sir, welcome to the Rainbow Travel Agency. What can I do for you?

Peter: l want to spend a week at Ooty with my family. I want you to help me with the arrangements for the trip. (gives his plan) 

T.A: You have come to the right place, Sir. We offer the best facility for a family.

Peter: Oh. I see. Wonderful. I want an accommodation that overlooks the hills and the valley. 

T.A: For how many days do you plan to stay at Ooty Sir? 

Peter: For a week.

T.A: We have taxis and mini-buses that take you in the morning for sight-seeing, and bring you back in the evening, 

Peter: That is good, but I do not want a breezy visit to every tourist place. I want to spend some time at every place. My children are interested in boating and horse riding. (Yes, not a breezy visit. Spend some time. Children interested in boating and horse riding) 

T.A: That is right Sir, Surely they should enjoy themselves and carry back happy memories. We can arrange for that. Your lodging facility is available in the 2nd week of April. Is that o.k.? 

Peter: Yes, that would be fine. How do I pay you – with cash or credit card? 

T.A: We accept both. You can pay as you find convenient.

Peter: Thank you. I will pay cash.

T.A: I hope you and your family find your stay unforgettable and enjoyable. (Hope stays unforgettable and enjoyable.)

My grandfather is critically ill. I am his favorite grandson/daughter. Please grant me leave for fifteen days so that I can be with him and look after him.

1. 10.30

2. Brindavan Express

3. No.

4. Hubli

5. 13-00, i.e., 1.00 in the afternoon.

“My car has broken down. Could you please help me push it to a side ?”

OR

“I am unable to push the car all alone. Would you please help me in pushing it?”

The man appreciated the beauty in everything and liked those which pleased the senses even though they were not useful for any activity.

When the wrong man offered to draw pictures on her pitcher, the girl was slightly angry because she thought pictures did not help in making a pitcher more useful.

Indulge in: (enjoy, be happy in) Don’t indulge in gossip, it’s a bad habit.

Take to task: (reprimand, scold) Shamu was taken to task for dirtying the room.

Come to pass: (take place, happen) It came to pass that the idler was placed in the workers’ paradise.

Take charge of:(assume responsibility) Our new president is taking charge of the committee’s activities.

Get the better of: (win over) Bad people get the better of good people very easily.

Be filled with: (experience) I was filled with joy when I heard the news of my promotion. ‘ 

Shake off: (throw off) Shake off your lethargy and start practicing for the competition.

Set out for: (start for a place) Mahesh has set out for Mumbai to look for a new job. 

Laugh at: (mock at) Don’t laugh at others’ mistakes.

Raman worked for 15 years as Professor at Calcutta University.

Soviet Union honoured him by awarding the International Lenin Prize in 1957.

Firstly, the artist has the ability to draw very well and attract the attention of others towards his art. Secondly, though the girl is not immediately ready to give attention to his art, she is open-minded enough to consider it when he draws on her pitcher. After paying more attention to his art, she becomes so impressed with it that she is ready to go with him when he leaves the workers’ paradise.

He did his Intermediate examination from Hindu College at Vishakapatnam.