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(B) Its inheritance is autosomal dominant

tRNA is one of the special kinds of RNA molecules. The function of the tRNA is to form a match of mRNA codon with the amino acid with which it forms codes. Each tRNA consists of a set of three nucleotides called an anticodon. The tRNA has an amino acid acceptor site which is one of the four sites of tRNA. The amino acid is attached to the tRNA at the amino acid acceptor site.

(A) uvr ABC excinuclease

A) Core

Very purpose for which product is created is its Core benefits.

C) Service

Service is contributing heavily to the economy all over the world.

The correct answer is both 1 and 2.

• At a different level, historians of religion classified bhakti traditions into two broad categories:
  • Saguna (with attributes):
    • The Saguna included traditions focused on the worship of specific deities such as Shiva, Vishnu, and his avatars (incarnations). Hence statement 1 is correct.
    • Forms of the goddess or Devi, all often conceptualized in anthropomorphic forms. Hence statement 2 is correct.
  • Nirguna (without attributes):
    • Nirguna bhakti on the other hand was the worship of an abstract form of god. 

(1) What is evaporation ? 

(2) What is condensation ?

(3) Is evaporation cooling process or warming process ? 

(4) Is condensation cooling process or warming process ? 

(5) Wet clothes dries in which process ? 

(6) Formation of dew is which process ?

Aim : Determination of focal length of bi - convex lens using UV method. 

Material Required : V stand, convex lens, light source, screen, meter scale etc. Take a V-stand and place it on a long (nearly 2m) table at the middle. Place a convex lens on the V-stand. Imagine the principal axis of the lens. Light a candle and ask your friend to take the candle far away from the lens along the principal axis. Adjust a screen (a sheet of white paper placed perpendicular to the axis) which is on other side of the lens until you get an image on it. 

Procedure :

(1) Take a V-stand and place a convex lens on this stand. 

(2) Imagine the principal axis of the lens. 

(3) Light a candle and ask your friend to take the candle far away from the lens along the principal axis. 

(4) We use a screen because it forms a real image generally which will form on a screen. Real images cannot be seen with an eye. 

(5) Adjust the screen, on the other side of lens until clear image forms on it. 

(6) Measure the distance of the image from the stand and also measure the distance between the candle and stand of lens. 

(7) Now place the candle at a distance of 60 cm from the lens such as the flame of the candle lies on the principal axis of the lens. 

(8) Try to get an image of candle flame on the other side on a screen. 

(9) Adjust the screen till you get a clear image. 

(10) Measure the distance of image (v) from lens and record the value of 'u' and 'v' in the table. 

(11) Repeat this for various distances of images; in all cases note them in the table. Observation :

Conclusion : From this we conclude that a convex lens forms both real and virtual images when object is placed at various positions.

The allotropes of carbon are classifed into two types. They are :

(i) Amorphous forms,

(ii) Crystalline forms.

Examples :

Amorphous forms : Coal, coke, wood charcoal, animal charcoal, lamp black, gas, carbon,petroleum coke, sugar, charcoal etc.

Crystalline forms : Diamond, graphite and buckminsterfullerene.

(1) X is an acid. 

(2) Y is a base. 

(3) (X + Y) is neutral solution. 

(4) Hence, (X + Y) solution changes into parrot green with universal indicator.

(1) Water consists H₃O⁺ and OH^– ions.

(2) In distilled water, the concentration of both H₃O⁺ and OH^– is same.Hence they do not form as ions, 

so distilled water can be treated as a neutral solution.

(3) As there is no flow of ions, distilled water do not conduct electricity.

(a) Water, because its specific heat is high. 

(b) Lead has low specific heat, so it heats up quickly and cools down quickly, it is useful in soldering. 

(c) Aluminium has high specific heat than copper. So, copper is best to make cooking utensils. 

(d) Ice takes less heat energy to rise its temperature than water

(1) The ciliary muscles to which eye lens is attached helps the eye lens to change its focal length by changing the radii of curvature of the eye lens. 

(2) When the eye is focussed on a distant object, the ciliary muscles are relaxed. So, that the focal length of eye lens has its maximum value. 

(3) The parallel rays coming into the eye are then focussed on to the retina and we see the object clearly. 

(4) When the eye is focussed on a closer object, the ciliary muscles are strained and focal length of eye lens decreases. 

(5) The ciliary muscles adjust the focal length in such a way that the image is formed on retina and we see the object clearly. This process of adjusting focal length is called 'accommodation'. 

(6) Really this 'accommodation' is a wonderful phenomenon through which we are able to see the distant and near objects. 

(7) So, I appreciate the working of ciliary muscles in the eye.

Answer: Chilling

The lens has been made up of three different materials.These three different materials will have three different refractive indices. Hence three different images will be formed.1/f∝ (n-1)

When the angle of incidence is greater than critical angle, the light ray reflected into denser medium at interface, i.e., light never enter to rarer medium. This phenomenon is called total internal reflection.

Applications of total internal reflection : 

(1) Brilliance of diamonds : Total internal reflection is the main cause for brilliance of diamonds. The critical angle of diamonds is very low (24.4°). So if a light ray enters into a diamond it is very likely to get total internal reflection which makes the diamond shine brilliant. 

(2) Optical fibres : Total internal reflection is the basic principle for working of optical fibre. 

(3) Mirage : Mirage is an optical illusion where it appears that water is collected on the road at a distant place but when we get there, the road is dry.

(1) Take about 10 ml of water each in two test tubes.

(2) Add a drop of oil to both the test tubes.

(3) Label them as A and B.

(4) Add a few drops of soap solution to test tube B.

(5) Now shake both the test tubes vigorously for the same period of time.

(6) We can see the oil and water layers separately in both the test tubes immediately after we stop shaking them.

(7) Leave the test tubes undisturbed for sometime and observe.

(8) The oil layer separates out first in which test tube we added drops of soap solution.

The Largest virus is Pox virus.

(B) DNA polymerase α

When the angle of incidence is greater than critical angle, the light ray reflected into denser medium at interface, i.e., light never enter to rarer medium. This phenomenon is called total internal reflection.

(1) Brilliance of diamonds: Total internal reflection is the main cause for brilliance of diamonds. The critical angle of diamonds is very low (24.4°). 

So if a light ray enters into a diamond it is very likely to get total internal reflecton which make the diamond shine brilliant.

(2) Optical fibres: Total internal reflection is the basic principle for working of optical fibre.

(3) Mirage: Mirage is an optical illusion where it appears that water is collected on the road at a distant place but when we get there, the road is dry.

Chromosomes exchange genetic material during meiosis in a process called crossing over. Chromosomes exchange genetic material during meiosis in a process called crossing over.

The compaction of chromosomes continues throughout leptotene. This is followed by the second stage of prophase-I called zygotene. During this stage chromosomes start pairing together and this process of association is called synapsis.Crossing over is the exchange of genetic material between two homologous chromosomes.

Mass of water (m) = 1 gm

Latent heat of vapourization (L) = 540 Cal/gm.

Heat energy required to change Q = ?

Q = m.L(vap) = 1 × 540 = 540 Cal. (releases)

Stage 1 → Heat releases from water vapour at 100°C

When converts into water at 100°C = Latent heat of vapourization

= 540 cal (Q₁)

Stage 2 → Heat energy releases from water at 100°C

When converts into water at 0°C

Q₂ = mSΔT, Here ΔT = 100°C – 0°C = 100°C 

(∵  m = 1 gm; S = 1 Cal/gm°C.)

= 1 ×1 ×100 = 100 Cal.

Total energy releases ⇒ Q₁ + Q₂ ⇒ 540 + 100 ⇒ 640 Cal.

(D) Iron

• Milk contains high quantities of vitamins A and vitamin B, such as thiamine, nicotinic acid and riboflavin, although it is a low source of vitamin C & vitamin E.
• There is also vitamin B₁₂ in it.
• Calcium, sodium, phosphorus and potassium are major minerals in milk. But it is a bad source of iron.

Answer : M Phase (C) 

(Ref. NCERT CHAPTER 10.4.1 diplotene paragraph) 

In prophase I the chrosomes start condensing and by the end of prophase they're fully condensed and we already know prophase is a part of M phase. 

Thanks

Answer: brushing teeth.

Scototropic movements induced by Night.

(4) Turgor movement

Answer : Southern Blotting (D) 

Once we've introduced the gene into a virus culture we can eradicate the first option as it's linked to Bacteria (plasmids are a part of bacteria ​​​) 

The introduction of gene is itself considered as transformation so option B is eradicated

Transduction is a procedure of genetic recombination in which a virus injects it's genetic material into the host which the whole point of doing this recombination thing.

Thanks. 

(a)(1) The chemical name of baking soda is sodium by hydrogen carbonate (NaHCO₃) and its pH value is 8.1. 

(2) When milk man adds a little baking soda to fresh milk, the pH of the fresh milk (6) shifts to '8', thus becoming alkaline. 

(3) Thus the spoilage of milk can slow down. 

(b) 1) Lactic acid which was formed initially reduces the basic nature of the baking soda. 

(2) Then more lactic acid is needed to convert milk to curd. 

(3) That is why it takes time to produce more lactic acid and hence the milk takes a long time to become curd. 

i) Since the fresh milk is acidic it turns sour early in presence of baking soda, milk become alkaline and does not turn sour easily because of alkali does not allow the milk to become more acidic early.

ii) When the milk sets to curd the pH decreases i.e., it becomes more acidic the presence of alkali does not allow it to become more acidic easily hence it will take a long time to set as curd.

The hip joint is surrounded by several muscles, including:

• Gluteal muscles, located on the back of the hip (buttocks);
• The adductor muscle on the inner thigh;
• The iliopsoas muscle, which extends from the lower back to upper femur;
• Quadriceps, a group of four muscles that comprise the front of the thigh; and
• Hamstrings, a group of muscles that comprise the back of the thigh and extend to just below the knee.

Given series is S = 42+39+36+...

Let first term of the sequence is a₁ = a = 42.

Common difference of the sequence is d = a₂ - a₁ = 39 - 42 = -3.

∴ Sum of n terms of the sequence is S_n = n/2 [2a+(n-1)d]

Given that sum = 315

∴ n/2 [2 x 42 + (n-1) x -3] = 315

⇒ 42n -3/2 n(n-1) = 315

⇒ 84n - 3n² + 3n = 630

⇒ 3n² - 87n + 630 = 0

⇒ n² - 29n + 210 = 0

⇒ n² - 14n - 15n + 210 = 0

⇒ (n - 14) (n - 15) = 0

⇒ n = 14 or n = 15

Hence, sum of 14^th terms of the series is 315. Also, sum of 15th terms is 315 (∵ a₁₅ = a+14d = 0)

The correct answer is Decrease.

• pH is a scale used to determine the acidity or basicity of an aqueous solution.

• The pH scale indicates the concentration of hydrogen ions in the solution.
• Solution with a pH less than 7 is considered acidic.
• Solution with a pH greater than 7 is considered basic or alkaline.
• Solutions with a pH of 7 are neutral For e.g. pure water.
• The pH value of milk is 6 because it is acidic in nature.

• When the milk is converted into curd, lactic acid is formed which is more acidic in nature.
• Therefore, the pH value of the milk decreases as it turns to curd.

The flow of electrons in a circuit is called current, it is measured in Amperes (I).

The correct answer is Increasing the number of turns of the solenoid.

• A solenoid is a long-insulted copper wire wound in the form of a helix.

• The purpose of the solenoid is to generate a controlled magnetic field through a coil wound into a tightly packed helix.
• Thus, when an electric current is passed through a solenoid, the magnetic field is produced around it.
• The strength of the magnetic field depends upon the number of turns in the solenoid, the strength of the current, and the nature of the core material used in making the solenoid.
• The larger the current passed, the stronger will be the magnetic field produced in the solenoid.
• The larger the number of turns in the solenoid, the greater will be the magnetic field produced.

The correct answer is Protect the appliance against any damage.

• Electrical appliances are earthed to protect from an electric shock.
  • Due to the break of insulation of the wire, the live wire may come in contact with the body of the appliance and pass the current to the appliance, and on being touched a fatal shock can occur.
  • On earth, the appliance will not come in contact with the wire, instead the current will pass through the earth and we remain protected from an electric shock.

• ​MCB
  • MCB stands for Miniature Circuit Breaker.
  • It automatically switches OFF electrical circuit during any abnormal condition in the electrical network such as overload & short circuit conditions.
  • However, the fuse may sense these conditions but it has to be replaced through MCB can be reset.
  • The MCB is an electromechanical device that guards the electric wires & electrical load against overcurrent so as to avoid any kind of fire or electrical hazards.
• Electrical Earthing
  • The process of transferring the immediate discharge of the electrical energy directly to the earth with the help of the low resistance wire is known as electrical earthing.
    • The electrical earthing is done by connecting the non-current carrying part of the equipment or neutral supply system to the ground.
• Importance of Earthing
  • The earthing is essential because of the following reasons:
    • The earthing protects the personnel from the shortcircuit current.
    • The earthing provides the easiest path to the flow of shortcircuit current even after the failure of the insulation.
      • The earthing protects the apparatus and personnel from high voltage surges and lightning discharge.​

The flow of electrons in a circuit is called current, it is measured in Amperes (I).