Explore topic-wise InterviewSolutions in .

Spark plug cleaner and tester operates on 220 V AC power source.

Correct option: c) 151 to 1000 psi

To avoid the food from getting spoilt due to micro-organisms, the process of stopping their growth and removing them from the food is known as Food Preservation.

Methods of food preservation:

1. Canning 

2. Freezing

3. Drying 

4. Use of preservatives 

5. Brining 

6. Smoking 

7. Sterilization 

8. Use of sugar 

9. Heating.

Main objective of a sustainable society is judiciously using the natural resources for the present and future generation

Fear of failure/Fear of the unknown/Fear of risk taking

(c) Junction temperature

The correct answer is Margins.

• A margin is a space separating text or other elements from the edge of the paper commonly adjusted through the page setup.
• Most programs allow for the top, bottom, left, and right margins to be set. 
• By increasing the size of the margins, you decrease the available space on the page that text can occupy.
• In other words, a page with bigger margins has less room for text.
• If you decrease the size of the margins, the page can accept more text.

• Justify is a text that is both left-aligned and right-aligned. 
  • In Microsoft Word, you can use the Ctrl + J keyboard shortcut to justify any text.
• A trapdoor is a concealed means of bypassing security to gain access to a restricted part of a computer system.
  • For example, a programmer may insert a piece of code that would allow them access to a computer or secure area using a password that only they know.

(a) Unclipped

0.015625 A (C to A)

Given, marginal Revenue function MR = 9 – 4x²

Revenue function, R = ∫(MR) dx + k

R = \(\int\)(9 - 4x²)dx + k

R = 9x - 4/3x³ + k

Since R = 0 when x = 0, k = 0

R = 9 x - 4/3 x³

Demand funcatiuon P = R/x

P = 9 - 4/3x²

The correct option is A

Explanation:

• Sodium benzoate is the first preservative the FDA allowed in foods and still a widely used food additive. It’s classified as Generally Recognized As Safe (GRAS), meaning that experts consider it safe when used as intended 
• It’s approved internationally as a food additive and is assigned the identifying number 211. For example, it’s listed as E211 in European food products.
• Sodium benzoate inhibits the growth of potentially harmful bacteria, mold, and other microbes in food, thus deterring spoilage. It’s particularly effective in acidic foods (6Trusted Source).

Therefore, it’s commonly used in foods, such as soda, bottled lemon juice, pickles, jelly, salad dressing, soy sauce, and other condiments

Sodium benzoate and potassium sorbate are conventional food preservatives widely used in food products, with potent antimicrobial effects against spoilage-inducing microorganisms, such as Bacillus subtilis, S. aureus, E. coli, and Aspergillus flavus.

In liquid the intermolecular forces (vander waal’s forces) are greater than in gas.

w = 128 g

 V = 5 dm³ 

P = 10.0 bar 

M_SO2 = 64 g 

n = w/M = 128/64 = 2 

 Putting values in equation : ( P + an² /V² ) (V – nb) = nRT 

We get T = 329 K

The self linking property of carbon is known as catenation. This is the main reason of existence of such large number of compounds.

We have given,

Freezing point of pure C₆H₆ = 5.5\(^\circ\) C

The molal freezing point depression constant = 5.12\(^\circ\) C/m = k_f

\(\triangle\)T_f = K_f m

Where,  \(\triangle\)T_f = depression in freezing point

m = molality of solution

K_f = Depression constant.

Number of moles of C₄H₁₀ = \(\cfrac{4g}{58}\)

= 0.069 mol

molality of solution = \(\cfrac{0.069}{200}\times1000\)

= 0.345 m

\(\therefore\)  \(\triangle\)T_f = 5.12 x 0.345

= 1.77\(^\circ\) C

\(\therefore\) Freezing point of solution will be = 5.5\(^\circ\) C - 1.8\(^\circ\) C

= 3.7\(^\circ\) C

(c) Randomness of atoms 

CH₃ – CH₂– OH molecules has highest boiling point.

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

Ca²⁺ + Na₂ CO₃ → CaCO₃ ↓+ 2Na⁺

(b) An element is a material made up of different kind of atoms.

Ammonia is a base. Ammonia reacts with sulphuric acid and the salt ammonium sulfate is produced. 

2NH₃ + H₂SO₄ → (NH₂)2SO₄

 (d) MnO₂ or KMnO₄ with conc HCl give Cl₂ .

Classical smog: 

1. Classical smog is caused by coal-smoke and fog. 

2. It occurs in cold humid climate. 

3. The chemical composition is the mixture of SO₂ , SO₃ gases and humidity. 

4. Chemically it is reducing in nature because of high concentration of SO₂ and so it is also called reducing smog. 

5. It is primarily responsible for acid rain. 

6. It also causes bronchial irritation.

Photochemical smog:

1. Photochemical smog is cause by photochemical oxidants. 

2. It occurs in warm, dry and sunny climate.

3. The chemical composition is the mixture of NO₂ and O₃ gases. 

4. Chemically it is oxidising in nature because of high concentration of oxidising agents such as NO₂ and O₃ and so it is also called oxidising smog. 

5. It causes irritation to eyes, skin and lungs and increase the chances of asthma. 

6. It causes corrosion of metals, stones and painted surfaces.

 (d) K₂Cr₂O₇ + conc.HCl →Cl₂