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Depletion layer is a region created around the p-n junction which is devoid of free charge carriers and has immobile ions. It is created due to diffusion of majority carriers across the junction when p-n junction is formed. 

Potential barrier is a potential difference or junction voltage developed across the junction due to migration of majority carriers across it when p-n junction is formed. It opposes the further migration of majority carriers across the p-n junction. It appears as if a fictitious battery is connected across the p-n junction, with its positive terminal to n-region and negative terminal to p- region of p-n junction. The value of potential barrier is 0.3V for Ge and 0.7V for Si semiconductor diode. The forward bias voltage opposes the potential barrier. Due to it, the potential barrier is reduced and hence, the width of depletion layer decreases.

energy stored and also change in the energy stored. 

Given A = 100 cm² = 100 x 10^–4m²,

d = 3 mm = 3 x 10^–3m, V = 400 V, U₁ = ? 

K = 2.5, U₂ = ? also U₂ – U₁ = ? 

U = \(\frac{1}{2}CV^2\) C = \(\frac{\varepsilon_0 A}{d}\)

Calculating 

U₁ = 23.608 x 10^–7J 

U₂ = 59.02 x 10^–7J 

U₂ ∼ U₁ = 35.412 x 10^–7J

Attenuation is refererred to as the reduction in the strength of a signal while propagating through a medium. Attenuation is possible for both digital and analog signals as a result of long distance transmission.

(A) differentiable at x = 0 if a = 0 and b = 1 

(B) differentiable at x = 1 if a = 1 and b = 0 

f(x) = a cos(x³ – x) + bx sin(x(x² + 1)) 

It is a differentiable function ∀ x∈R

The correct answer is 1915.

• Mohandas Karamchand Gandhi landed on January 9, 1915, at the Apollo Bunder in Bombay after two decades of residence abroad.
• He received a "Kaiser-i-Hind" gold medal in the King’s birthday honors list of 1915.
• His political mentor on the Indian scene was Gopal Krishna Gokhale.
• Lord Hardinge’s open support of the Satyagraha movement had in any case removed the stigma of rebellion from South Africa’s Indian movement.

• As a 19-year-old, Mohandas Karamchand Gandhi had left India for the first time on September 4, 1888, to get enrolled in the centuries-old law institute Inner Temple in London.
• In 1894 Gandhi tried his first criminal cases in South Africa.
• From 1893 till 1913 Gandhiji practiced in South Africa.
• On March 12, 1930, Indian independence leader Mohandas Gandhi begins a defiant march to the sea in protest of the British salt monopoly.
• Gandhi set out from Sabarmati Ashram, Ahmadabad with 78 followers on a 241-mile march to the coastal town of Dandi on the Arabian Sea.
  • They reached Dandi on April 5, Gandhi was at the head of a crowd of tens of thousands. Gandhi spoke and led prayers and early the next morning walked down to the sea to make salt.

(a) One axis is linear, and the other is logarithmic

The correct answer is:  (d) 5

The correct answer is: (c) 0.707Amid

The correct answer is: (c) 3

The correct answer is: (b) 3 dB

The correct answer is: (b) 20 dB

The correct answer is: (c) 86 dB

The correct answer is: (d) 1000

The correct answer is: (c) 66 dB

The correct answer is: (c) 40 dB

The correct answer is: (c) 6 dB

A ray of light incident perpendicularly (⊥^x) on plane mirror. 90º will be measure of angle of reflection. 

The real absolute refractive index of air is greater than 1.

A parallel beam of light after reflection from a concave mirror converges at a point in front of the mirror. This point (F) is the focus of a concave mirror and it is real. 

Minimum distance for clear picture is 25 cm. 

Oersted inverted “Magnetic effect of electric current”

Centre of curvature (C) : The centre of the sphere of which the mirror is a part is called centre of curvature. 

–Homology refers to the traits inherited by two different organisms from a common ancestry. 

–Homologous organs are those organs which are similar in structure and different in function. 

–These organs have similar origin & different function. e.g.

(i) Forelimbs of vertebrates having pentadactyl limbs of similar origin and similar arrangement of bones. Muscles etc.  

–Fossils are the remains or impression of a pre-historic plant or animal embedded in rock and preserved in petrified from. 

–The study of fossils of some of the organisms show similarity between the two groups. 

The transfer and deposition of pollen grains from the anther to the stigma of a flower is called as pollination.  

Pollination is of two types :- 

(i)  Self pollination :-  The transfer of the pollen grains from the anther to the stigma of either the same or genetically similar flower.

(ii)  Cross pollination : The transfer of the pollen grains from the anther of one flower to the stigma of another flower on a different plant of the same species. 

C)  Placenta

IR² terms does not represent electrical power in a circuit.

Limitations of law of octaves :

(A)  The law of octaves was found to be applicable only upto calcium. It was not applicable to elements of higher atomic masses.

(B)  Position of hydrogen along with fluorine and chlorine was not justified on the basis of chemical properties.

{-3, -2, -1, 0, 1, 2, 3, 4, 5, 6} ∴ x ∈ (-3, 6)]

B)  Reduction

B)  Biodiversity

x + 1 = 3, 

∴ x = 2 

y – 2 = 1, 

∴ y = 3.

Valency of an element is the combining capacity of the atoms of the element with atoms of the same or different elements. The combining capacity is explained in terms of their tendency to attain a fully - filled outermost shell 

C) Nerve ending of a neuron

A) Cu + H₂SO₄ → CuSO₄ + H₂

Rancidity: When the food materials prepared in fats and oils are kept for a long time, they start giving unpleasant smell and taste, this is called rancidity.

This happens as follows : When the fats and oils present in food materials get oxidised by the oxygen (of air), their oxidation products have unpleasant smell and taste.The condition produced by aerial oxidation of fats and oils in foods marked by unpleasant smell and taste is called rancidity

2π/3 = (2 x 180)/3 = 120°

One of the main aim of conservation is to try and preserve the Biodiversity we have inherited.

D) Weak acid and strong base

When an iron article remains exposed to moist air for a long time, its surface is covered with a brown, flaky (non-sticky) substance called rust.

To prevent rusting. iron articles are not allowed to come in contact with the damp air. This can be done by painting the iron articles. 

Human cell contain 23 pairs of chromosomes out of 23 pairs, 22 pairs are called autosomes, rest of 1 pair, which determine the sex of child is called sex chromosomes.

The answer is B) IR²

Mirror formula 

1/v + 1/u = 1/f

D) Weak acid and strong base

Coal and petroleum, are two fossil fuels.