Age of oldest teachers=54 yerars
Age of youngest teachers = 23 years 
∴ Range = (54-23) years =31 years

Given

edge of a cube (a)=11cm

Now ,

TSA = 6×(11cm)²

= 6 × 121 cm²

= 726 cm²

Therefore,

TSA of the cube = 726 cm²

Q u e s t i o n: I am working on my computer (change into past continuous).

A n s w e r:

Past Continuous

I was working on my computer

2 2/3 + 3 1/2

= 8/3 + 7/2

= (16+21)/6

= 37/6

Ans: 

static, sliding, rolling

Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. Static friction comes into play when we try to move an object which is at rest. Sliding friction comes into play when an object slides over the surface of another object. In sliding friction, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason, sliding friction is less than static friction. Similarly, the area of contact in case of rolling friction is smallest as compared to static or sliding friction. This area of contact changes gradually because of rolling. Hence, rolling friction is lesser than both static and sliding friction. Thus, the correct sequence is—static, sliding, rolling

static, sliding, rolling

Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. Static friction comes into play when we try to move an object which is at rest. Sliding friction comes into play when an object slides over the surface of another object. In sliding friction, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason, sliding friction is less than static friction. Similarly, the area of contact in case of rolling friction is smallest as compared to static or sliding friction. This area of contact changes gradually because of rolling. Hence, rolling friction is lesser than both static and sliding friction. Thus, the correct sequence is—static, sliding, rolling

'डेरा डालने' का अर्थ है - अस्थाई रूप से बसना। आजकल पक्षियों को अपने घोसलें बनाने के लिए उपयुक्त जगह नहीं मिल पाती हैं इसलिए वे लोग इमारतों में ही अपना डेरा जमा लेते हैं। 

लेखक ने ग्वालियर से मुंबई तक अनेक बदलाव देखे-

• उसके देखते-देखते बहुत सारे पेड़ कट गए। 

• नई-नई बस्तियाँ बस गईं। 

• चौड़ी सड़कें बन गईं। 

• पशु-पक्षी शहर छोड़कर भाग गए। जो बच गए उन्होंने जैसे-तैसे यहाँ-वहाँ घोंसला बना लिया।

Dr. Sadao and Hana were standing outside their house. They saw someone flung by the waves of the sea. They went closer and saw that he was an enemy soldier. They were in a dilemma. They first thought of throwing him back in the sea. But their compassionate nature could not allow them to throw the wounded person into the sea.

So they decided to take him in and treat his wounds first and then hand him over to the police when he recovered. Dr. Sadao operated upon the wound of the American and brought the bullet out from the wound. He gave him an injection to boost up the pulse rate. Hana administered anaesthesia to the American. They served the soldier even after their servants left the house in protest against sheltering an enemy in the house. When the soldier was fully recovered from his illness, Dr. Sadao sent him back to sea to an unguarded island, from where he could go away in a Korean fishing boat.

लेखक के घर एक कबूतर का घोसला था जिसमें दो अंडे थे। एक अंडा बिल्ली ने झपट कर तोड़ दिया, दूसरा अंडा बचाने के लिए माँ उतारने लगीं तो टूट गया। इस पर उन्हें दुख हुआ। माँ ने प्रायश्चित के लिए पूरे दिन रोज़ा रखा और नमाज़ पढ़कर माफी माँगती रहीं।

• Safety rules are very important to consider when doing anything like crossing a road, while driving, while fixing some electronic equipment.

• Safety rules help to protect the people of our community. It also makes the community a much safer place.

• It makes us more aware of the surrounding and hat we are doing.

• One can perform their job more confidently and effectively knowing that they are safe.

• One does not need to worry about themselves if they are following the safety rules.

Mrs. Pumphrey was a rich woman who loved her dog very much. She loved to live a comfortable and lavish life and also wanted her dog to spend a similar one. She had maintained a wardrobe full of fancy fur coats, dresses, beds etc. for Tricki. Apart from this, she used to overfeed Tricki out of her love and concern. She used to serve him cod-liver oil and malt between the main meals and Horlicks after dinner to give him strength. She never realized that Tricki was a greedy dog and this would spoil his health. She could not even refuse to answer Tricki drooling for cream cakes and chocolates. Her overfeeding worsened Trickis condition. This made the dog lazy, inactive and obese. He used to lie on his rug and pant all day long. Mrs. Pumphrey fed him excessively, spoiling Trickis health to such an extent that he had to be hospitalized. Even in the hospital she continued to convey Tricki her love through eggs, wine and brandy. Her fondness and care for Tricki proved that excess of everything made him fall sick.
 

प्रकृति में आए असंतुलन का क्या परिणाम हुआ?
उत्तर
प्रकृति में आए असंतुलन का दुष्परिणाम यह हुआ कि मौसम अनिश्चित हो गया। अब गरमी में ज्यादा गरमी पड़ने लगी है, बेवक्त की बरसातें होने लगी हैं, तूफ़ान, भूकंप, बाढ़, नए-नए रोगों का प्रकोप बढ़ चला है।

• व्यापार अवरोध अंतर्राष्ट्रीय व्यापार पर सरकार द्वारा प्रेरित प्रतिबंध हैं।
• अधिकांश व्यापार अवरोध एक ही सिद्धांत पर काम करती हैं: व्यापार पर कुछ प्रकार की लागत (धन, समय, नौकरशाही, कोटा) का आरोपण जो कि व्यापार उत्पादों की कीमत या उपलब्धता को बढ़ाता है। यदि दो या दो से अधिक राष्ट्र बार-बार एक-दूसरे के खिलाफ व्यापार अवरोध का उपयोग करते हैं, तो एक व्यापार युद्ध हो सकता है।  
• अवरोध टैरिफ का रूप लेती हैं (जो आयात पर एक वित्तीय बोझ लगाती हैं) और व्यापार के लिए गैर-टैरिफ अवरोध (जो अन्य ओवरट और गुप्त साधनों का उपयोग आयात और कभी-कभी निर्यात को प्रतिबंधित करने के लिए करती हैं)।

Who are the four key players in the criminal justice system?
A n s w e r
The four key players are Police Public prosecutor Defence lawyer Judge

1. Police.
2. Public prosecutor.
3. Defence lawyer.
4. Judge.