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विषमता के सापेक्ष माप को विषमतांक कहते है । उसका विस्तार -1 से +1 और -3 से +3 प्राप्त होता है ।

कार्लपियर्सन की पद्धति से प्राप्त विषमतांक का मूल्य अधिक विश्वसनीय है ।

विषमता के मुख्य दो प्रकार है :

1. धन विषमता
2. ऋणात्मक विषमता

विषमता : विषमता अर्थात् आवृत्ति वितरण में सममितियता की कमी

वैषमतांक : वैषमतांक अर्थात् विषमता का सापेक्ष माप

बाउली का माप चतुर्थकों की स्थिति पर आधारित है ।

कार्ल पियर्सन की पद्धति में विषमता ज्ञात करने के लिए माध्य, माध्यिका, भूयिष्ठक और प्रमाप विचलन का उपयोग किया जाता है ।

जब आवृत्ति वितरण में भूयिष्ठक का मूल्य एक से अधिक हो अथवा मिश्र आवृत्ति वितरण हो या आवृत्ति वितरण में वर्गलम्बाई असमान हो तब j = \(3 (\frac{\bar X−M}S)\) सूत्र का उपयोग करके विषमतांक ज्ञात किया जाता है ।

सही विकल्प है (B) भूयिष्ठक से कम

सही विकल्प है (C) -3 से +3 तक

(i) >100 °C (ii) < 100 °C.

(a) Liquid X is ethanoic acid; it belongs to homologous series of carboxylic acids. Methanoic acid is another member of this homologous series.

(b) Liquid Y is Propanone; it belongs to homologous series of ketones. Butanone is another member of this homologous series.

(c) Propanal; it belongs to homologous series of aldehydes.

(d) Liquid Z is ethanol; it belongs to homologous series of alcohols. Methanol is another member of this homologous series.

Correct option is  D) pupil

The king was unhappy because all the people of his kingdom were irresponsible.

The king was unhappy because all the people of his kingdom were irresponsible.

He saw a pit in the middle of the road. He put the gold coins in it.

Everytime he went out in his chariot, the king used to see stones and rubbish lying on the roads.

The king wanted to teach his people that if they would be responsible, it would be rewarding to them.

He saw a pit in the middle of the road. He put the gold coins in it.

(a) True

(b) False

(c) True

(d) False

(e) False

(f) True

Correct option is A. Grinding

1. True

2. False

3. False

4. False

5. True

6. False

Correct option is (b) Setting an organization’s objectives and the means of reaching them.

The Oompa-Loompa volunteer was 20 years old before swallowing the drops. After swallowing four drops of the new invention, he started wrinkling and shrivelling up all over. His hair started dropping off and his teeth started falling out. He suddenly became 75 years old. The name of the invention is Vita-Wonk.

True Non-ionic detergents are used for dish washing purpose.

In a closed and crowded place, the number of people are more. All of them breathe out carbon dioxide. Therefore the amount of CO₂ in the air is much more than the amount of oxygen available for inhalation. Therefore we find it difficult to breathe in a closed and crowded place.

1. AC तथा FC
2. GH JI FG
3. BOA
4. A या H
5. HE था DE

नहीं, स्पर्श रेखा है।

1. Dr. Williams

2. pericardium

3. Harvey Cushing

4. James Cornish

a. It is thought that Sushruta was probably the first surgeon to perform surgical operations, and the Sushruta Samhita is one of the oldest works In the world that deal with surgery.

b. The first cardiac surgery was done by Dr Williams. A patient, James Cornish. was suffering from a very serious knife wound, and the knife had cut an artery less than an inch from his heart. It had punctured the pcricardium. Dr Williams and six staff doctors performed a complicated and daring operation and repaired the heart. This became the first successful cardiac surgery.

c. Harvey Cushing was the first neurosurgeon and is considered to be the father of modern neurological surgery. In the early part of the 20g” century, he developed basic techniques and instruments for operating on the brain. Cushing reduced the mortality rate for neurosurgery from 90% to less than 10%. By 1937, when he retired, he had successfully removed more than 2000 tumours. One of his most significant achievements was the development of a method to stem blood loss by inventing a clip called the ‘silver clip’ or the ‘Cushing clip’.

d. Robotic surgery is a type of minimal invasive surgery. Use Is made of miniature surgical Instruments, that fit through quarter-inch Incisions. Robotic surgery gives the surgeon a 3-D view of the operating site. Every movement he makes with the master controls Is replicated accurately by the robot. When necessary. the surgeon can even change the scale of the robot’s movements. Surgeons can use this technology to perform complex surgical procedures.

Nowadays, more advanced techniques are used to deal with heart complications. Open heart surgery, which helps to repair heart defects and heart valves and even replace them, is also performed successfully.

a. There was lack of technology,so Major surgery could not develop for centuries.

b. Cardiac Surgery was tried in the past butPatients did not survive.

c. He places his fingers into the master controls and He operates all four arms of the Davinci.

d. Open heart surgery can help to repair heart valves or It can also replace them.

e. Heart patients were treated with sedatives but They did not survive.

f. These procedures can be performed through very small incisions so Our patients experience a number of benefits.

1. main clause: Open heart surgery is also performed successfully subordinate clause: which can help to repair heart defects

2. main clause: They can treat patients of all ages. subordinate clause: who have suffered a stroke

1. surgery → youth → happiness → strength → health

2. simple x complicated increased x reduced

3. disorders, dramatically, magnified, mortality.

(i) Excretory system, circulatory system, Endocrine system.

(ii) 1. Left kidney, 

2. dorsal aorta, 

3. right ureter, 

4. urinary bladder, 

5. urethra.

(iii) Nephron or kidney tubules.

(iv) (a) Urea, 

(b) Uric acid.

(v) (a) Ultrafiltration, 

(b) Selective reabsorption.

(a) Excretory system and Circulatory system. 

(b) 1-kidney, 2-renal artery, 3-ureter, 4-urinary bladder, 5-urethera 

(c) Nephron 

(d) Urea and ammonia 

(e) Ultrafiltration and selective reabsorption

(a) The process of removal of chemical wastes especially nitrogenous waste from the body is known as excretion.

(b) Nephrons

(c) As the cortex region contains numerous nephrons or kidney tubules, therefore, it shows a dotted appearance.

(d) Kidneys help in removing wastes or excretion and osmoregulation.

(e) The blood vessel 'B' is renal artery and the blood vessel 'A' is renal vein.

So the blood vessel 'B' contains oxygenated blood with high concentration of urea and glucose whereas the blood vessel 'A' contains deoxygenated blood with low concentration of urea and glucose as compared to renal artery.

A quantity which can be measured and expressed in form of laws is called a physical quantity. Physical quantity (Q) = Magnitude × Unit = n × u 

Where, n represents the numerical value and u represents the unit. as the unit(u) changes, the magnitude (n) will also change but product ‘nu’ will remain same. 

i.e. n u = constant, or n₁u₁ = n₂u₂ = constant;

Mass of car = 1000 kg 

Initial velocity, u = 20 m/s 

Final velocity, v = 10 m/s 

Retardation = a 

Distance covered = s 

Using third equation of motion 

v² – u² = 2as 

as = -150 

Work done, 

W = Fs

F = ma 

W = mas 

as = -150 

W = (1000)(150) = -150 kJ 

Negative sign shows that the brakes are acting on the opposite direction of motion.

5 x 3 = 15 बटन

Given 

Mass of Body (m) = 50 Kg, 

Time (t) = 9s, 

Height of each step = 15 cm, 

Acceleration due to gravity (g) = 10 m/s² .

Now

Weight = mg = 50×10 = 500N

Height of staircase = 45 x \(\frac{15}{100}\) = 6.75 m    (∵ 1m = 100 cm )

Power = \(\frac{Work}{Time}\) = \(\frac{mgh}{t}\)

⇒ Power = \(\frac{500\times6.75}{9}\) = \(\frac{3375}{9}\)

Power = 375 Watt

Given 

Mass of Body (m) = 50 Kg, 

Time (t) = 45s, 

Height of each step = 15 cm, 

Acceleration due to gravity (g) = 10 m/s² . 

Now 

Weight = mg = 50×10 = 500N 

Height of staircase = 15 x \(\frac{15}{20}\) = 2.25 m

(∵ 1m = 100 cm)

Power = \(\frac{work}{Time}\) = \(\frac{mgh}{t}\)

⇒Power = \(\frac{500\times2.25}{45}\) = \(\frac{1125}{45}\) =25

Power = 25 Watt 

Power used in climbing stairs = 25 W

It States that the wavelength (λ_m) corresponding to which energy emitted by a perfectly black body is maximum is inversely proprotional to the temperature (T) of the black body, i..e.,

λ_m ∝ 1/T or, λ_m = b/T, where b is a constant of proprotional and is called Wien's constant. Its Value is, b = 2.898 X 10^-3 mK.