Explore topic-wise InterviewSolutions in Current Affairs.

• Parturition is initiated by the foetal ejection reflex, a neural mechanism of mild contractions of the uterus, initiated by the fully developed foetus and placenta.
• It triggers the release of oxytocin from maternal pituitary, which causes stronger contractions of uterine muscles and stimulates more secretion of oxytocin.
• The stimulatory reflex between uterine contractions and secretion of oxytocin continues and results in parturition, i.e. the delivery of the baby; hence it is called an neuro-endocrine mechanism.

Option : B. Gold

Option : A. Zn

Aldehyde can be obtained from acid chlorides (RCOCI) by catalystic hydrogentation in presence of palladium catalyst suspended in barium sulphate. This reduction reaction is known as Rosenmund reaction.

Product advertising is the art of establishing between a product and its potential consumers. It creates the need in the consumers, gets them interested in its features and directly and/or indirectly informs them as to how the product is better than those of the competitors.

(A)  Stomatal

Option : B. 4, 5, 6 or 7

(c) It is a passive process

Alkyl halide react with sodium alkoxide to form ether.

R - X + RoNa → R - O - R + NaX and

CH₃Br + CH₃ONa → CH₃ - O - CH₃ + NaBr

Sodium methoxide  Dimethyl ether

Correct option: (d) HSO₄^-

Explanation: 

HSO₄^- can accept a proton (forms H₂SO₄) or can donate a proton (forms SO₄^2-).  

The possibility of incorporating sounds adds a lively dimension to the possibilities ofMultimedia. Human speech, music-vocal and instrumental, natural sounds, synthetic sounds, machine sounds, sounds that allude to various environments like the bazzar, the railway station, the airport can be brought in to one’s presentations. They can be used singly as well as in combination. These sounds can be incorporated into the computer either by direct recording by means of a microphone or by transferring prerecorded sound from the other media like the audio cassettes or CDs

When the ad agency receives its brief, it begins to work on the concept of an ad/ ad campaign. Depending upon the reach of the product and resources of the manufacturer, the range of the campaign varies from regional, national and also it varies in terms of the media used. So once the scale is decided upon, the agency begins to make prototypes of ads in various forms such as the newspaper ad, billboard ad, ad on the Net, TV commercial etc.

(d) chlorophyll content of leaves

Correct option: (b) H₂O

Explanation: 

HBr is strong acid and H₃O⁺ is weak acid in reaction. 

Video is an audio-visual data that can be available in analogue as well as digital formats.

Catch the eye

Optimization

Emotional Connection and Trust Increase Quality

(b) dorsiventral leaf

 R - CH₂ - OH \(\overset{Cu}{\underset{300°C}{\longrightarrow}}\) R – CHO + H₂

(b) Automatic expansion valve

Constant pressure expansion valve is also known as Automatic expansion valve.

Henna gives the colour to your hair. 

• It makes the hair healthy, strong, thick and silky. 

• Henna is considered to be a natural conditioner for hair. 

• Henna makes hair manageable and tangle free. 

• Henna don’t gives any side effect like other chemical hair colours do. 

• It helps to control dandruff.

(b)  sucrose

Option : A. Cu + Zn

Hair conditioners contain positively charged molecules called cationic surfactants. Soap, shampoo, and other cleaners contain surfactants (also called detergents) that are anionic; That is negatively charged. The positively charged surfactants in hair conditioner are attracted to the negative charges in your hair, and do not rinse out completely with water. When the hair dries, it is coated with a thin film, which adds weight, makes the hair easier to comb, and prevents static electricity from building up and ‘frizzing’ the hair.

(a) when the root pressure is high and the rate of transpiration is low

A pair of optically active isomers which are non-super impossible mirror images of each other.

When an alkyl halide is heated with alcoholic solution of silver cyanide, alkyl isocyanide is formed. Isocyanides are also called carbylamines.

R - X + AgCN \(\overset{alcohol}{\longrightarrow}\) R - NC + AgX

Ex: When ethyl bromide is heated with alcoholic silver cyanide solution, ethylisocyanide (ethylcarbylamine) is formed.

CH₃ - CH₂ - Br + AgCN \(\overset{alcohol}{\longrightarrow}\) CH₃ - CH₂ - NC + AgBr

The reaction which take place in a sequence of elementary reactions to give the products.

Alcoholic potassium hydroxide

A → Products Rate [A]¹ 

When [A] is increases 2 times, rate also increases to two limes.

1. High specificity: Chemisorption is highly specific and it will only occur when adsorbent and adsorbate molecules can chemically react with each other, e.g., oxygen is adsorbed on metals by oxide formation. 

2. Surface area: Chemisorption increases with increase with increase in surface area of the adsorbent.

Threshold energy: The energy below which no excitation of electrons takes place.

When a beam of light is passed through a colloidal solution and the solution is viewed at right angles to the passage of light, they show a mild to strong opalescence, i.e, the path of beam flight is illuminated. This phenomenon is called Tyndall effect. This is cause due to scattering of light by colloidal particles.

The zig-zag movement of colloidal particles is known as Brownian movement.

Similar to lowering of vapour pressure, the elevation of boiling point also depends on the number of solute molecules rather than their mixture. A solution of 1 mol  of sucrose in 100 g of water boils at 373.52 K at one atmospheric pressure.

Let T_b⁰ be the boiling point of pure solvent and T_b be the boiling point of solution. The increase in the boiling point ΔT_b = T_b - T_b⁰ is known as elevation of boiling point. Experiments have shown that for dilute solutions the elevation of boiling point (ΔT_b) is directly proportional to the molal concentration of the solute in a solution. Thus

ΔT_b ∝ m

or ΔT_b ∝ K_bm

Here m(molality) is the number of moles of solute dissolved in 1 kg of solvent and the constant of proportionality K_b is called boiling point Elevation constant or molal Elevation Constant.

First three-digit number which is a multiple of 9 = 108

Second three-digit number which is a multiple of 9 = 117

Third three-digit number which is a multiple of 9 = 126

…

n^th three digit number which is a multiple of 9 = 999

So, the arithmetic sequence is 108, 117, 126, …, 999

Common difference = a = 117 − 108 = 9

First term of the arithmetic sequence = a + b = 108

⇒ 9 + b = 108

⇒ b = 108 − 9 = 99

Therefore, x_n=9n+99, where n is a natural number.

⇒ 999 = 9n + 99

⇒ 999 − 99 = 9n

⇒ 900 = 9n

⇒ n = 100

Therefore, there are 100 three-digit numbers, which are the multiples of 9.

We know that the sum of a specified number of the consecutive terms of an arithmetic sequence is half the product of the number of the terms with the sum of the first and the last term.

∴ Sum of its first 100 terms = 1/2 x 100 x (x₁₀₀+x₁) … (1)

Here, x₁ = 108 and x₁₀₀ = 999

Putting the values in equation (1):

Sum of first 100 terms = 1/2 x 100 x (999+108)

= 50 x 1107

= 55350

tan 135°

=tan (180-45)°

=-tan 45° (as in quadrant 2)

=-1

Cr₂O₇^2- + Fe²⁺ → Cr³⁺ + Fe³⁺

Vf = 6   Vf = 1

Mili. eq. of Cr₂O₇^2- = 1[M x 10]

M = 24 x 10^-2

Answer is (0.019)

Let A = \(\begin{bmatrix}a&b\\c&d\end{bmatrix}\)

so total number of matrix formed = 10⁴

For non-invertible matrix |A| = ad - bc = 0

⇒ ad = bc

Case I a ≠ d

(10 x 9) x 2!

Case II a = d

10 x 1

So required probability = \(\frac{10\times9\times2!+10}{10^4}\)

 = \(\frac{19}{1000}\) = 0.019

Converse: 

If x is odd then x is prime 

Contrapositive: 

If x is not odd then x is not prime.

cos x = 1/2, 

General solution : x = 2nπ ± π/3