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Sugar. (Others are inorganic compounds.)

Answer: (c) Bismuth

Petrol. (Others are inorganic compounds.)

Given (92)² –(91)²

According to the property 8 i.e. for every natural number n, we have [(n+1)²-n²] = [(n+1) + n]

Here n = 91 By applying the above property we get,

(92)² – (91)² 

= (91+1) + 91

= 92 + 91

= 183

Given (105)² – (104)²

According to the property 8 i.e. for every natural number n, we have [(n+1)²-n²] = [(n+1) + n]

Here n = 104 By applying the above property we get,

(105)² – (104)² 

= (104+1) + 104 

= 105 + 104 

= 209

Given (141)² – (140)²

According to the property 8 i.e. for every natural number n, we have [(n+1)²-n²] = [(n+1) + n]

Here n = 140 By applying the above property we get,

(141)² – (140)² 

= (140+1) + 140 

= 141 + 140 

= 281

Given (310)²

We have (a + b)² = (a² + 2ab + b²)(310)² can be written as 300 + 10 So here a=300 and b=10

Using the formula,

(300 + 10)² = (300² + 2 X 300 X 10 + 10²)

On simplifying we get

(300 + 10)² = (90000 + 6000 +100)

(310)² = 96100

By periodic classification of the elements, we mean the arrangement of the elements in such a way that the elements with similar physical and chemical properties are grouped together and for this, various scientists made contributions, but however, the contributions made by Mendeleev are of great significance and he gave a periodic table called as Mendeleev's Periodic Table which was older and replaced by long form of periodic table.

The correct answer is True

विभवमापी की सुग्राहिता का अर्थ है कि जौकी को शून्य विक्षेप स्थिति से थोड़ा-सा खिसकाने पर धारामापी में बहुत अधिक विक्षेप उत्पन्न हो जाये। विभवमापी की सुग्राहिता विभव-प्रवणता के व्युत्क्रमानुपाती होती है। परन्तु विभव-प्रवणता K =  (जहाँ V = विभवमापी के तार के सिरों का विभवान्तर), अत: K ∝ 1/L अर्थात् विभवमापी के तार की लम्बाई L बढ़ाने से K का मान कम हो जाएगा; अर्थात् सुग्राहिता बढ़ जाएगी। इस प्रकार विभवमापी की सुग्राहिता में वृद्धि तार की लम्बाई में वृद्धि करके की जा सकती है।

(1) As civilization has grown more complex, the workers have become more and more enslaved. They have to work like machines.

(2) The labourers have to work in dangerous conditions of working at rail-road bridge, skyscraper, freight train, stockhold, stockyard and training at docks.

(1) From time immemorial, men have followed with blind loyalty the strong men who had the power of money and of armies.

(2) Even while their own ones died on the battlefields fighting, these slaves have tilled the lands of the rulers and have been robbed off the fruits of their labour.

sin 27°.sec 63° 

= sin 27°.sec(90° – 27°)

= sin 27°.cosec27°

= sin 27°.1/tan 37° 

= 1

tan(90° + θ) = – cotθ

cos(180° – θ) = – cosθ

tan210° 

= tan(180° + 30°) 

= tan30° = 1/√3

cos37° cosec53° 

= cos 37°.cosec(90° – 37°) 

= cos 37° sec37° 

= cos 37°.1/cos37° = 1

sin 225° 

= sin(180° + 45°)

= – sin 45° = 1/√2

Cos55° / sin 35°

= cos(90° - 35°) / sin 35°

= sin 35° / sin 35°

 = 1

Here the 3 quantities are men, books typed and number of days. 

Let the number days taken to type 2 books by 8 men be x.

From the above,

• Number of days and men are in inverse proportion. 
• Number of days and typed books are in direct proportion.

Here number of days depends on both men and number of books typed. 

So, we have to take compound ratio of

 8 : 5 and 10:2. 

8 : x = 8 × 10 : 5 × 2 

Since the ratios are equal, 

The product of means = The product of extremes 

⇒ 8 : x = 80 : 10 

⇒ x × 80 = 8 × 10

⇒ 80x/80 = 80/80

⇒ x= 1 day Or 

x = 5/8 x 2/10 x 8 = 1

∴ Number of days taken to type 2 books by 8 men is 1.

(d) it was knocking down the bricks of the outhouse. (✓)

(a) no one would come to see them (✓)

(b) wanted to grow flowers to attract butterflies. (✓)

Correct answer is (d) gardening

(d) the animals and birds would find it easier to live. (✓)

Correct answer is (b) Twenty

Grandfather built a bungalow and planted trees around it. During the rains grandfather walked into the jungle. He planted cuttings & saplings. They found a small rocky island and grandfather planted a number of tamarind, laburnum and coral tree saplings. During the second world war, the author was sent to a boarding school. Two or three years later he went to England. Some years later, the author returned and saw the island. He looked around and noticed a beautiful small green paradise.

1. Grandfather built a bungalow. 

2. He planted trees around it. 

3. During the rains Grandfather walked into the jungle. 

4. He planted cuttings & saplings. 

5. They found a small rocky island. 

6. Grandfather planted a number of tamarind, laburnum and coral tree saplings. 

7. During the second world war, the author was sent to a boarding school. 

8. Two or three years later he went to England. 

9. Some years later, the author returned and saw the island.

10. He looked around and noticed a beautiful small green paradise.

1. True 

2. False 

3. False 

4. True 

5. False

Correct answer is (b) replacing

Grandmother felt that trees growing in the house made it look like a roof brought down by jungle.

(d) forest covered the island. (✓)

Answer is (b) n, n + 1

Answer is (d) 0

Correct option is (a) source, message, interference, channel, receiver, feedback, environment, and context.

Correct option is (b) much of the information is in the context or in the person.

Correct option is (b) The way people use words to create common meaning

1. a) particular 

b) honoured

2. a) skillful 

b) correct

3. a) depress 

b) met

4. a) gathered 

b) admired

1. Class V

2. 22

3. C) Class VII

4. B) Class VI

5. C) The total number of boys and girls in Class V is 35.

1. At noon they sat under a tree.

2. The tiger jumped on the three friends and ate them up.

3. A) the tricks

4. A) The second friend

5. C) They wanted to perform the tricks in a nearby village.

(a) You can keep going if the path looks clear

(c) Pedestrians

(a) Road safety

1) Footpath : It is laid on either side of the road for the use of pedestrains.

2) Road divider : The road is divided into two halves for separating the two directions of the traffic on the same road. 

3) Zebra Crossing : Zebra crossing is the place where the pedestrains cross the road Sufely.

(c) at Zebra crossing

(b) (i) and (iii) are Correct

1. False 

2. False 

3. True 

4. True 

5. False 

6. True 

7. True 

8. False

9. True 

10. True 

11. False 

12. True 

13. False

1. Cautionary 

2. Commercial 

3. 2016 

4. Penal 

5. Right Hand Curve

6. Park this side 

7. 1988 

8. low 

9. seat belt 

10. helmet