Explore topic-wise InterviewSolutions in Current Affairs.

Correct option is (b) Volume 

Correct option is (A) 1/2 , 1/8

In ccp lattice: 

Number of O atoms → 4 

Number of Octahedral voids → 4 

Number of tatrahedral voids → 8 

Number of Al³⁺ = 4 x m

Number of Mg²⁺ = 8 x n

Due to charge neutrality

4 (-2) + 4m (+3) + 8n (+2) = 0

∴ m = 1/2 and n = 1/8

Correct option is (A,B)

Beside aldehyde α-hydroxy ketones can also show Tollen’s test due to rearrangement in aldehyde via ene diol intermediate. (however this needs a terminal α-carbon)

(B) The efficiency of atom packing is 74% 

(C) The number of octahedral and tetrahedral voids per atom are 1 and 2, respectively 

(D) The unit cell edge length is 2 2 times the radius of the atom

The middle layers will have 12 nearest neighbours. The top-most layer will have 9 nearest neighbours. 4r = a√2 , where ‘a’ is edge length of unit cell and ‘r’ is radius of atom.

(C) NaBH₄ in C₂H₅OH 

(D) Raney Ni/H₂ in THF

NaBH₄ and Raney Ni/H₂ do not react with acid, ester or epoxide entities of an organic compound.

1. Lithium-ion battery

Anode : Porous graphite

Cathode : Transition metal oxide as CoO₂ 

Electrolyte : Lithium salt in an organic solvent 

2. At the anode oxidation occurs

Li_(s) —Li⁺_(aq) + e^- 

At the cathode reduction occurs.

Li⁺ + CoO_2(s) + e^- → Li CoO_2(s)

3. Overall reactions

Li_(s) + CoO₂ → Li CoO_2(s)

4. Both electrodes allow Li⁺ ions to move in and out of their structures. During discharge the Li⁺ ions produced at the anode moves towards cathode through the nonaquaeous electrolyte. 

5. When a potential greater than the emf produced by the cell is applied across the electrode, the cell reaction is reversed and now the Li⁺ ions move from cathode to anode where they become embedded on the porous electrode. This is known as intercalation. 

6. Uses:- This Li-ion battery is used in cellular phones, Laptop computer and digital camera.

1. It is because in saline water, there are more H⁺ ions. Greater the number of H⁺ ions, quicker the rusting will take place. 

2. It is because aluminium metal is more reactive than hydrogen aid it will react with H₂O.

Given:

CP = Rs. 42/litre

SP = Rs. 56/litre

While buying, Rangeela takes 50 ml extra

While selling, Rangeela gives 50 ml less

Purchase from supplier in a day = 20 litres

Formula used:

Profit = SP - CP

Calculation:

Cost price of 1 litre of milk = Rs. 42

He takes 50 ml extra so by giving the cost of 1 litre of milk he takes 1.05 litres.

He bought 20 litres from his supplier  

He actually bought = 1.05 × 20 = 21 litres

He sells 50 ml less for every litre 

For 21 litre he saves 1.05 litres 

So his total sale is 22.05 litres and he paid for only 20 litres.

Rangeela makes his profit from (22.05 - 20) litres which is 2.05 litres 

Cost price of 2.05 litres = Rs. (42 × 2.05)

⇒ Rs. 86.1

Selling price of 2.05 litres = Rs. (56 × 2.05) = Rs. 114.8

⇒ Rs. 114.8

Profit = SP - CP

⇒ Rs. (114.8 - 86.1)

⇒ Rs. 28.7

∴ Rangeela earned a profit of Rs 28.7.

 Correct option is (B) -π/8

\(tan^{-1}[\cfrac{cos(4π-π/4)-1}{sinπ/4}]\)

⇒ tan^-1\((\frac{cos π/4 - 1}{sin π/4})\) 

tan^-1(\(\frac{1-√2}1\)) = \(-\frac{\pi}8\)

Common tangent (x² + y² - 2x + 6y +6) - (x² + y² - 5x + 6y + 15) = 0

= - 2x + 5x + 6y - 6y + 6 - 15 = 0

= 3x - 9 = 0

= x = \(\cfrac93\) = 3

= x = 3

Hence, x = 3 is common tangent

(A) Statement – 1 is True, Statement – 2 is True; Statement – 2 is a correct explanation for Statement – 1. 

The correct answer is : (c) a < 0

(d) x/√(1 + x²)

The correct answer is : (a) (4, 7)

• Failure in bringing about changes in economic sector. 
• Regulation on freedom of expression and opinion. 
• Corruption and inefficiency of the bureaucracy. 
• Administrative measures of Mikhail Gorbachev.

Correct option (2) Higher Rf value means higher adsorption

Explanation:

Low polarity compounds are weekly absorbed and has greater Rf value 

Correct option (4) 6 and 7

Explanation:

This highest oxidation state of uranium is +6 whereas of plutonium is + 7 

Correct option  4) inert pair effect

Explanation :

Due to inert pair effect Tl is stable is +1 oxidation state 

The correct answer is Millets.

• The Union Government of India has decided to declare 2018 as National Year of Millets in order to boost the cultivation of millets on a mission mode to attain nutritional security in the country.
• The initiative is expected to promote the cultivation of millets like jowar, bajra, ragi.

• The Union Agriculture Minister Radha Mohan Singh while addressing MPs in a consultative committee meeting in New Delhi in March 2018 stated that millet cultivation has dwindled due to change in dietary habits and unavailability of millets in the country.
• As a result of this change in dietary habits and unavailability of millets, level of nutrients like proteins, Vitamin-A, iron, and iodine fell in women and children in the country.
• In order to improve the consumption of nutrients in women and children, a special focus on millets is given under the National Food Security Mission (NFSM) .
• Millets contain higher amounts of fibre and essential minerals. Barnyard millet, Kodo millet, Little Millet, Proso Millet are considered as the healthiest millet grains available.
• Millet is a rich source of potassium—a mineral that keeps human organs such as kidney and heart-healthy.
• It is also an excellent source of Vitamin A, Vitamin B, Phosphorus, Potassium, Antioxidants, Niacin, Calcium, Iron etc.

Correct option  (3)  L/2m

Explanation:

dA/dt  =  L/2m

Recent studies demonstrate that CAD, a rate-limiting enzyme in the de novo synthesis of pyrimidines, is regulated through reversible phosphorylation, Myc-dependent transcriptional changes and caspase-mediated degradation.

Li⁺ ion is smaller in size. It forms more stable lattice with smaller anion oxide, O^2- than with CO₃^2- ion. Therefore, Li₂CO₃ decomposes into Li₂O at lower temperature on the other hand, Na⁺ ion being larger in size forms more stable lattice with larger anion CO₃^2-than with O^2- ion. Therefore, Na₂CO₃ is quite stable and decomposes into Na₂O at very high temperature.

Aspartate transcarbamoylase (ATCase) catalyzes a key step of pyrimidine biosynthesis, the condensation of carbamoyl phosphate with aspartate to form N-carbamoylaspartate. The Escherichia coli enzyme has been extensively studied.

Correct option (C) Thymine

(C) Bacteria

A key difference between plasma and serum is that plasma is liquid, and serum is fluid. While most of the components are the same for both plasma and serum, plasma contains fibrinogen which is absent in serum. Both plasma and serum can be extracted from blood with the use of a centrifuge but it’s worth noting that serum is obtained after the clotting of blood, while plasma can be obtained before the coagulation of the blood. Serum is mostly used for blood typing but is also used for diagnostic testing. Plasma on the other hand, is mostly used for blood-clotting related problems.

• At the sinusoidal surface of the liver, unconjugated bilirubin detaches from albumin and is transported through the hepatocyte membrane by facilitated diffusion.
• In order for bilirubin to be excreted into bile and, therefore, eliminated from the body, it must be made more soluble.
• Hepatocytes have a selective and highly efficient system for removing unconjugated bilirubin from plasma.
• In the hepatocyte, the transported bilirubin is bound to ligandin, a cytosolic protein, that facilitates transfer to the endoplasmic reticulum, the site of bilirubin conjugation.

Hysteresis: The phenomenon of lagging behind the magnetic induction (\(\vec B\)) with respect to the magnetizing field (\(\vec h\)) is called hysteresis.

Retentivity: The property of the magnetic material to retain magnetism even in the absence of the magnetizing field is known as retentivity or remanence.

Coercivity: The magnetizing field (H) needed to demagnetize the magnetic material completely is known as coercivity.

• Every region has a different house.
• The type of house depends on the climatic conditions in the region. 
• Houses are built specially to suit the needs of the people.​

• In places of hot climate, it is advised that the outer walls of the house be painted white because light colour.
• This does not absorb any heat radiation from the sun which keeps inside cool even if there is a hot climate outside the house.
• The light colour will reflect the light and therefore absorb less heat.
• Thereby keeping the house cool.

Thus, in the hot climate areas, houses are often painted with light colours because they do not absorb sunlight.