Explore topic-wise InterviewSolutions in Current Affairs.

From the figure it is given that

x: y: z = 5: 4: 6

We can also write it as

x + y + z = 5 + 4 + 6 = 15

It is given that XOY is a straight line

So we know that

x + y + z = 180^o

As we know the sum of ratio is 15 then we can write that the measure of x as 5

The sum of all the angles in a straight line is 180^o

So we get the measure of x as

x = (5/15) × 180

On further calculation

x = 60

As we know the sum of ratio is 15 then we can write that the measure of y as 4

The sum of all the angles in a straight line is 180^o

So we get the measure of y as

y = (4/15) × 180

On further calculation

y = 48

In order to find the value of z

We know that

x + y + z = 180^o

Substituting the values of x and y we get

60^o + 48^o + z = 180^o

On further calculation

z = 180^o – 60^o – 48^o

By subtraction we get

z = 72^o

Therefore, the values of x, y and z are 60^o, 48^o and 72^o.

(d) x = 80

Because,

It is given that the angles of the side be 55^o, 45^o and (x)^o.

= x + 55^o + 45^o = 180^o … [∵ Linear pair]

= x = 180 – 100

= x = 80

(i) If two angles are complementary, then the sum of their measures is 90° 

(ii) If two angles are supplementary, then the sum of their measures is 180° 

(iii) Two angles forming a liner pair are supplementary 

(iv) If two adjacent angles are supplementary, they form a linear pair 

(v) If two lines intersect at a point, then the vertically opposite angles are always equal 

(vi) If two lines intersect at a point, and if one pair of vertically opposite angles are acute angles, then the other pair of vertically opposite angles are obtuse angles.

From the figure we know that ∠AOC and ∠BOC are a linear pair of angles

So we get

∠AOC + ∠BOC = 180^o

We know that

62^o + x^o = 180^o

On further calculation

x^o = 180^o – 62^o

By subtraction

x^o = 118^o

Therefore, the value of x is 118.

We know that AOB will be a straight line only if the adjacent angles form a linear pair.

∠BOC + ∠AOC = 180^o

By substituting the values we get

(4x – 36)^o + (3x + 20)^o = 180^o

4x – 36^o + 3x + 20^o = 180^o

On further calculation we get

7x = 180^o – 20^o + 36^o

7x = 196^o

By division we get

x = 196/7

x = 28

Therefore, the value of x is 28.

Option : (A)

Faces are the flat surface on a 3D figure. 

Thus, 

cone has one flat surface, 

i.e., the base. 

Number of faces of a cone = 1

(b) x = 35

Because,

It is given that the angles of the side be (2x – 10)^o and (3x + 15)^o.

= (2x – 10) + (3x + 15) = 180 … [∵ Linear pair]

= 2x – 10 + 3x + 15 = 180

= 5x + 5 = 180

= 5x = 180 – 5

= 5x = 175

= x = 175/5

= x = 35

Option : (C)

Total surface area of a hemisphere = curved surface area + base area 

⇒ total surface area of a hemisphere of radius r is 

= 2πr² + πr² = 3πr²

The unknown angles are

∠e = 180° – 125° = 55° (supplementary angles)

∠f = ∠e = 55° (∵ vertically opposite angles)

∠a = ∠e = 55° ∠b = 125°

∠c = ∠a = 55° (∵ vertically opposite angles)

∠d = ∠b = 125°

(i)  Yes, ∠1 is adjacent to ∠2

(ii) No, ∠AOC is not adjacent to ∠AOE.

(iii) Yes, ∠COE and ∠EOD are linear pair.

(iv) Yes, ∠BOD and ∠DOA are supplementary.

(v) Yes, ∠1 is vertically opposite to ∠4.

(vi) The vertically opposite angle of ∠5 is ∠2
+ ∠3 ie., ∠COB.
∠COE + ∠EOB = ∠COB

Correct Option  (c) Kinetic energy is constant

(d) It moves in a circular path

Explanation:

In the given condition, the particle undergoes uniform circular motion and for uniform circular motion the velocity and acceleration vector changes continuously but kinetic energy is constant for every point

Correct option is: (iii) initial velocity of the object

Total power p = 500w × 4 = 2000w.
Time, t = 10h
Energy = p × t.
= 2000w × 10h
= 2kwh × 10h = 20kwh.
∴ Energy = 20kwh.

In case of bicycle, the muscular energy is converted into the kinetic energy of the bicycle.

H₂SO₃ (Sulphurous acid), H₂SO₄ (Sulphuric acid).

(a) We can apply Einstein’s mass energy relation in this problem, E = mc², to calculate the energy equivalent of the given mass.

Here,

1 amu = 1u = 1.67 × 10^-27 kg

Applying E = mc²,

E = (1.67 × 10^-27)(3 × 10^-8)²J

= 1.67×9 ×10^-11J

or, E = \(\frac{1.67\times9\times10^{-11}}{1.6\times10^{-13}}MeV\)

= 939.3 MeV

≈ 931.5 MeV

(b) As E = mc²

⇒ \(m=\frac{E}{c^2}\)

According to this 1 u = \(\frac{931.5meV}{c^2}\)

Hence, the dimensionally correct relation is 

1 amu × c² = 1u × c²

= 931.5 MeV

Correct answer is (a) Estuarine, West Bengal

1. Fishery can never be a job. It is a livelihood or can be an occupation. 

2. Fish is a renewable resource. If managed properly, it can be a sustainable resource. 

3. The sustainability is dependent upon the availability of fishes and other edible organisms. But due to climate change, pollution and overexploitation of fish resources, these are depleting rapidly, it is estimated by the scientists that by 2050, no fish will be left in the seas. 

4. However, if aquaculture is done to raise fishes, partly it can be sustaining. But there . are many environmental regulations that can hamper the business of aquaculture.

1. The eggs of silkworm hatch into larvae. 

2. The larvae develop into a caterpillar. 

3. Caterpillar feeds on fresh mulberry leaves. 

4. After its growth and moulting, the silkworm secretes a silk fibre to form cocoon. 

5. The silk is a continuous filament comprising fibroin protein, secreted from salivary glands of silkworm and a gum called sericin, which cements the filaments.

6. The silk solidifies when it contacts the air. 

7. The silkworm spins approximately one mile of filament and completely encloses itself in a cocoon in about two or three days.

• During human evolution, the climate of earth started becoming dry.
• This resulted in loss of forest cover.
• The apes which were arboreal on the trees thus descended and started walking on land.
• The lumbar bones underwent change and the apes started walking upright on the grasslands.
• The vertebral column also underwent change. Due to upright posture the forelimbs were freed from locomotion.
• The legs started bearing the weight of the body and the hands became available for use.

1. Sericulture is the practice of rearing silkworms for the production of silk. 

2. The silkworm (Bombyx mort) is reared for obtaining best quality of silk called mulberry silk. Tussar silk and Eri silk are other varieties of silk which are inferior to the mulberry silk. 

3. Larvae of silkworm are fed on the mulberry leaves. Quality and quantity of silk depends on the quality of mulberry leaves.

4. These larvae are reared, developed and well looked after by the skilful labour keeping a constant watch. 

5. Silkworm larvae may be infected by protozoans, viruses and fungi. Ants, crows, birds, and other predators are ready to attack these insects, hence the cages of these larvae must be managed to prevent predators attack. 

6. Silk is obtained from the cocoon of the silkworm. 

7. Sericulture is an age old practice and can be started with low investment and small space. It requires scientific knowledge and skill. Disabled, older and handicapped people also can practise it.

1. Stages of development in the life cycle of silkworm are egg, larva, pupa and adult. 

2. The larva is the silkworm caterpillar. 

3. The adult (imago) stage is the silkworm moth.

1. Silkworm larvae may get infected by protozoans, viruses and fungi. 

2. Ants, crows, other birds and predators may attack these larvae.

3. Hence, cages of silkworm larvae must be well managed and protected.

इसके लिए सतर्कता आयोग, लोकपाल तथा लोकायुक्त की आवश्यकता बढ़ी है ।

Correct answer is (d) Aldosterone

The five ideas are: 

1. Life is full of sufferings. 

2. People should be kind to other and respect all lives. 

3. People should be taught in their own language. 

4. People should know about life after death. 

5. People should lead simple lives. 

These ideas have great importance even today.We should give importance to kind ness and ahimsa or non-violence.These ideas can change our life and prevent the unrest in our society

Those who wanted to join the sangha had to take permission of their parents or their masters. The masters would not give permission easily, because slaves worked very hard and did not get wages. So it was difficult for the slaves to join the sangha.

Siddhartha Gautama, known as the Buddha was the founder of Buddhism He tired to spread his message to the people in the following ways: 

1. The languages of the common people were Prakrit and Pali. The Buddha tried to spread his messages in the language of, Prakrit, so that everyone could understand his message. 

2. He spent his life in travelling on foot, going from place to place, teaching people, till he passed away at Kusinagar,in present-day Uttar Pradesh. 

3. He also encouraged people to think for themselves, rather than to simply accept what he said.

Let tan^-12 = θ

⇒ tan θ = 2

sec² θ = 1 + tan² θ

= 1 + (2)²

= 1 + 4 = 5

∴ sec² (tan^-12) = 5

Let cot^-13 = Φ = cot Φ = 3

∴ cosec² Φ = 1 + cot² Φ

= 1 + (3)² = 1 + 9 = 10

∴ cosec²(cot^-1 3) = 10 …..(ii)

Adding eq. (i) and (ii), we get

sec² (tan^-12) + cosec² (cot^-13) = 5 + 10

⇒ sec² (tan^-12) + cosec²(cot^-13) = 15

Hence proved.

(d) Archaebacteria

• Thermus aquaticus is a thermophilic gram negative bacteria which produces Taq Polymerase a key enzyme for Polymerase Chain Reaction (PCR).

Syphilis is caused by Treponema pallidum.

• PHB (Poly-β hydroxyl butyrate) is a microbial plastic synthesize by Ralstonia.

Bacteria used in the curing of tea is Mycococcuscandisans. 

• Bt toxin found in Bacillus thuringiensis finds application in raising insect resistant crops (Bt Crops.

1. Agonist and antagonist act in opposite directions. Agonist is a substance which combines with cell receptor to produce some reaction that is typical for that substance. 

2. On the other hand antagonist is the chemical which opposes or reduces the natural function.

• The special flavor and aroma of the tea are due to fermentation of Tea leaves by bacteria. 
• Eg: Bacillus megatherium. This is called curing of Tea and Tobacco.

• In sexual reproduction of fungi, the two sexual hyphae are morphologically similar but dissimilar physiologically. 
• This phenomenon is called heterothallism. Eg : Rhizopus. 

1. (d) A.G. Tansley 

2. (c) AP de Candolle 

3. (a) Walter Rosen 

4. (e) John Ray 

5. (b) Carolus Linnaeus

1. (d) Extreme conditions 

2. (a) Beneficial 

3. (e) disease causing 

4. (c) membrane bound organelles 

5. (b) 70 s type of ribosomes

• It’s a fungal group refer to genus Claciceps 
• It is a Alkaloid produced by Claviceps purpurea (fungus), called ergotamine. 
• Its is used as vasoconstrictor. 

• Fungi like Amanita verna are highly poisonous due to the production of Toxins. They are commonly referred to as Toad stools.

1. (d) Jungle cat 

2. (e) Emerald dove 

3. (a) Pea fowl 

4. (b) Red Panda

5. (c) Tiger

• Yeast is used for the fermentation of sugars to yield alcohol. 
• Bakeries use yeast for the production of bread, buns, rolls etc.

1. (d) Aristotle 

2. (c) John Ray 

3. (a) Charles Darwin 

4. (e) Carl Woese

5. (b) R.H. Whittaker

An organism that does not reproduce, can be placed in a living category. It is because, reproduction is not necessary for the survival of a living organisms. Many organisms like mule, sterile worker bees, and infertile human couples are not able to reproduce. But since, they have all other defining properties of life, so they can be called as living.

• Reproduction is required for the perpetuation of a population. 
• It is not necessary for the survival of living organisms. 
• Many organisms. Eg: Mules, Sterile worker bees,infertile human couples are not able to reproduce, while they have all other defining properties of life, so they can be called as Living. 

Yeast and Hydra reproduce by Budding. 

1. (d) Preserved plants and animals 

2. (b) Similarities and dissimilarities of organisms. 

3. (e) Plant Taxonomy 

4. (c) Difference in homologous DNA sequence 

5. (a) Analysis of DNA

(b) reproduction