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सही विकल्प है (ख) दो

प्लेट विवर्तनिकी के सिद्धान्त के अनुसार पृथ्वी का स्थलमण्डल सात मुख्य प्लेटों व कुछ छोटी प्लेटों में विभक्त है। सात मुख्य प्लेटों के नाम निम्नलिखित हैं(1) अंटार्कटिक प्लेट (जिसमें अंटार्कटिक से घिरा महासागर भी सम्मिलित है), (2) उत्तरी अमेरिकी प्लेट, (3) दक्षिणी अमेरिकी प्लेट, (4) प्रशान्त महासागरीय प्लेट, (5) इंडो-ऑस्ट्रेलियन-न्यूजीलैण्ड प्लेट, (6) अफ्रीकी प्लेट, (7) यूरेशियाई प्लेट (जिसमें पूर्वी अटलांटिक महासागरीय तल भी सम्मिलित है)।

सही विकल्प है (ख)1967 में।

सही विकल्प है (ख) पृथ्वी का घूर्णन

Answer is (B) City B

Correct Answer is: (c) Ariyalur

I returned home at 3 o’clock.

1. The cheetah is the fastest animal on the earth and its top speed can be around 100 km per hour.

2. A cheetah can take a leap as long as 25 metres.

3. The cheetah creeps silently behind the prey and then leaps up to catch it.

4. The cheetah does not preserve its prey and hence, sometimes the cubs and young cheetahs die.

5. The cheetah is called a solitary creature because it does not live in groups or herds.

6. A cheetah family separates as soon as the cubs mature.

I reached school at 8 o’clock yesterday.

Largest area of land is used in the cultivation of Paddy

I joined this school in 2002.

Correct Answer is: (b) Nilgiris

In investment proposals filed by MSMEs, TN ranks I.

Gujarat became a separate state in 1960.

Rajendra Prasad was India’s first s President.

A public company means a company which is not a private company.

A Private Limited company is a company which by its articles restricts the right to transfer share, limits the maximum number of members to 200.

Correct Answer is: a. the unlimited liability of the partners.

1. True
2. False
3. False
4. False
5. False

The author has presented a word picture of the process of the formation of the Himalayas. India was being pushed northwards, it jammed against Asia, its crust was buckled and the Himalayas were formed.

लेखिका ने हिमालय के बनने की प्रक्रिया का एक शब्द-चित्र प्रस्तुत किया है। भारत को उत्तर की ओर धकेला जा रहा था, यह एशिया के विरुद्ध अड़ गया, इससे इसकी ऊपरी सतह मुड़-तुड़ गई और हिमालय का निर्माण हो गया।

The author during her journey to Antarctica, sees Crabeater seals stretching and sunning themselves on ice floes. She compares those seals to the stray dogs stretching themselves under the shade of a banyan tree in India.

लेखिका अपनी अंटार्कटिका यात्रा के दौरान, बर्फ की तैरती हुई चादरों पर अँगड़ाइयाँ लेती हुई और धूप सेंकती हुई केकड़े खाने वाली सील मछलियों को देखती है। वह उन सील मछलियों की तुलना भारत में किसी बरगद के पेड़ की छाँव में अंगड़ाइयाँ लेते हुए आवारा कुत्तों से करती है।

Phytoplankton is small seagrasses. These single-celled plants use the sun’s energy to assimilate carbon and synthesise organic compounds. They are necessary to nourish and sustain the lives of all the marine animals and birds of the region.

फाइटोप्लैंकटन छोटे समुद्री घास के पौधे हैं। ये एककोशिकीय पौधे सूर्य की ऊर्जा का प्रयोग करके कार्बन ग्रहण करते हैं और जैव यौगिकों को संश्लेषित करते हैं। ये अपने क्षेत्र के सभी समुद्री पशु-पक्षियों के जीवन को पोषित करने व धारण करने के लिए आवश्यक हैं।

Phytoplankton is small seagrasses. These single-celled seagrasses make food for themselves in the presence of sunlight. They use carbon dioxide and give out oxygen. They also maintain the food chain of the entire Southern Ocean.

फाइटोप्लैंकटन (पादपप्लवक) छोटे-छोटे समुद्री घास के पौधे हैं। ये एककोशिकीय समुद्री घास के पौधे सूर्य के प्रकाश की उपस्थिति में स्वयं के लिए भोजन बनाते हैं। ये कार्बन डाई ऑक्साइड का उपभोग करके ऑक्सीजन छोड़ते हैं। ये सम्पूर्ण दक्षिणी समुद्र की भोजन श्रृंखला को भी बनाए रखते हैं।

(i) Given f(x) = 2 - 3x, x ∈ R,x > 0 

For x > 0, f(x) = 2 – 3x < 2

∴ Range of f = (-∞, 2) 

(ii) Given f(x) = x² + 2, x ∈ R 

For x ∈ R, f(x) = x² + 2 ≥ 2 

Range of f = [2, ∞) 

(iii) Given f(x) = x, x∈ R For r∈ E, f(x) = x ∈ R 

Range of f = R

Given f(n) = the highest prime factor of n.

f(9) = the highest prime factor of 9 = 3 

f(10) = the highest prime factor of 10 = 5 

f(11) = the highest prime factor of 11 = 11

f(12) = the highest prime factor of 12 = 3

f(13) = the highest prime factor of 13 = 13

Range of f ={3,5,11,13}

True

We have, AxB= {{a, x), {a, y), (b, x), {b, y)}

A = Set of first element of ordered pairs in A x B = {a, b}

B = Set of second element of ordered pairs in A x B = {x, y}

As the name suggests, an interpreter transforms or interprets a high-level programming code into code that can be understood by the machine (machine code) or into an intermediate language that can be easily executed as well. The interpreter reads each statement of code and then converts or executes it directly.

Match the columns:

Convex mirror and concave mirror are the two types of spherical mirror.

Concave mirrors are used in torches, headlights, shaving mirrors, dentists’ mirrors, solar devices etc.

Uses of concave mirror : 

1.  Concave mirrors are used by dentists to see enlarged image of tooth.
2.  Concave mirrors are used in car head lights.

Anal styles are unsegmented hair like out-growths arising from the end of the abdomen in male cockroach.

Uses of convex mirror : 

1.  Convex mirrors are used as rear view mirrors in vehicles because convex mirrors increase field of view. 
2.  Convex mirrors are used in street light reflectors as they spread light over greater

Periplaneta americana

I know that acid turns blue litmus to red. With the help of this test I can find the acid. Distilled water and base don’t do so. Thus I identify each.

Hint: Use both red and blue litmus solutions and predict the colours in each case.

Soil B. Soil B is acidic in nature so its treated with powdered chalk to reduce its acidity.

Hint: If the soil is too acidic, it is treated with bases such as quick lime (calcium oxide) or slaked lime (calcium hydroxide). If the soil is too basic, organic matter is added to it. Organic matter releases acids which neutralises the basic nature of the soil.

Solution of pH = 11

The scientist who developed the pH scale is-

Sorenson

Spherical mirrors are newly adapted in ATMs.

• Take the lens (Ex : Convex), which focused towards the distant object. 
• A white coated screen (Ex : White paper) is placed on the other side of the lens.
• Adjust the screen till you get a clear image of the object. 
• At this position measure the distance between the lens and screen which is equal to the focal length of the lens.

Correct Answer is: (c) Eskimos

Given: base = 24 cm, corresponding height =14.5 cm

Area of a triangle = 1/2 x base x corresponding height

= 1/2 x 24 x 14.5

= 174 cm²

(i) Mr. Trygve Lie 

(ii) Mr. Dag Hammarskjold 

(iii) Mr. U. Thant 

(iv) Mr. Kurt Waldheim 

(v) Mr. Javier Perez de Cuellar 

(vi) Mr. Boutros Boutros Ghali 

(vii) Mr. Kofi Annan

(viii) Mr. Ban Ki Moon 

(ix) Mr. Antonio Guterres

The black death is estimated to have killed 30 – 60 percent of Europe’s total population during the 14th century. The dominant explanation for black death is attributed to the outbreak of plague.

The Security Council holds discussions and talks with member nations to maintain international peace and security. If war has taken place between any member nations, it tries to bring an end to it by arbitration or negotiations. If internal threat to peace is created within any member nation, the Security Council holds discussions with the head of that nation, visits it and tries to establish peace by holding meetings.