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(b) Siam (Thailand)

(i) Southeast Asia was under Indian influence starting around 200 BC until around the 15th century, when Hindu-Buddhist influence was absorbed by local politics.

(ii) Kingdoms in the southeast coast of the Indian subcontinent had established trade, cultural and Political relations with Southeast Asian Kingdoms in Burma, Thailand, Indonesia, Malay Peninsula, Cambodia and Vietnam.

1. (d)

2. (e) 

3. (a) 

4. (b) 

5. (c)

1. Second World War 

2. Singapore, Malacca 

3. Hanoi 

4. 300 

5. Fishermen, Peasants 

6. Cecil Rhodes 

7. Zulu 

8. Nigeria 

9. Emperor Menelik 

10. Vasco da Gama

Given, 

internal radius of hollow sphere, r = (\(\frac{4}2\)) = 2 cm 

External radius = \(\frac{8}2\) = 4 cm 

Volume of hollow sphere = \(\frac{4}{3}π(R^3 - r^3)\)

= \(\frac{4}{3}π(4^3 - 2^3)\) --------(i) 

Given, 

diameter of the cone = 8 cm 

∴ Radius of the cone = 4 cm 

Let height of the cone be h 

Volume of the cone = \(\frac{1}{3}πr^2h{}\)

= \(\frac{1}{3}π4^2h{}\)--------(ii) 

Since hollow sphere is melted into a cone so their volumes are equal,

\(\frac{4}{3}\) π × (4³ – 2³) = \(\frac{1}{3}\) π × 4² × h

4 x (64 – 8) = 16 x h

4 x 56 = 16 x h

h = \(\frac{4 \times 56}{16}\)

∴ h = 14 cm

Let the height of the cone be h cm.
Let the height of the cone be h cm.
Volume of the cone = ⅓ πr1²h
= ⅓ π × 4² × h = 16πh/3

Volume of the cone = Volume of the hollow sphere
16πh/3 = 4/3π(56)
16h = 4 ×56
h = (4 × 56)/16
h = 56/4 = 14 cm

Hence, the height of the cone is 14 cm.

= ⅓ π × 4² × h = 16πh/3

Volume of the cone = Volume of the hollow sphere
16πh/3 = 4/3π(56)
16h = 4 ×56
h = (4 × 56)/16
h = 56/4 = 14 cm

Hence, the height of the cone is 14 cm.

(a) Colonel Pennycuick

(i) * is not associative for if we take a = 1, b = 2 and c = 3, then

(a * b) * c = (1 * 2) * 3 = (1 – 2) * 3 = – 1 – 3 = – 4 and

a * (b * c) = 1 * (2 * 3) = 1 * (2 – 3) = 1 – ( – 1) = 2.

Thus (a * b) * c ≠ a * (b * c) and hence * is not associative.

(ii) * is associative since Q is associative with respect to multiplication.

(iii) * is not associative for if we take a = 2, b = 3 and c = 4, then

(a * b) * c = (2 * 3) * 4 = (2 – 3 + 6) * 4 = 5 * 4 = 5 – 4 + 20 = 21, and

a * (b * c) = 2 * (3 * 4) = 2 * (3 – 4 + 12) = 2 * 11 = 2 – 11 + 22 = 13

Thus (a * b) * c ≠ a * (b * c) and hence * is not associative.

(iv) * is not associative for if we take a = 1, b = 2 and c = 3, then (a * b) * c =

(1 * 2) * 3 = 4 * 3 = 4 × 9 = 36 and a * (b * c) = 1 * (2 * 3) = 1 * 18 =

1 × 182 = 324.

Thus (a * b) * c ≠ a * (b * c) and hence * is not associative.

The answer is (a) Parenchyma

Given fraction = 3\(\frac{1}{16}\) = \(\frac{49}{16}\)

Product = 9\(\frac{3 }{16}\) = \(\frac{147}{16}\)

Fraction × fraction to be multiplied = \(\frac{49}{16}\)

\(\frac{49}{16}\) × other number = \(\frac{147}{16}\)

other number = \(\frac{147}{16}\) ÷ \(\frac{49}{16}\) = \(\frac{147}{16}\) × \(\frac{16}{49}\)

Other number = 3 

∴ Number to be multiplied = 3.

Given one number = 9\(\frac{3}{4}\) = \(\frac{39}{4}\)

Product = \(5\frac{2}{3}=\frac{17}{3}\)

\(\frac{39}{4}\) x Required Number = \(\frac{17}{3}\)

Required Number = \(\frac{17}{3}\) ÷ \(\frac{39}{4}\)

= \(\frac{17}{3}\) x \(\frac{4}{39}\)

= \(\frac{17\times4}{3\times39}\)

= \(\frac{68}{117}\)

Number to be multiplied = \(\frac{68}{117}\)

206.5 × 100 

Number of zeroes in 100 is two. 

So, decimal point has to shift to two places right in the product. 

∴ 206.5 × 100 = 20650

i) 4 x 2/7=

= 4x2/7 = 8/7

ii) 4 x 3/5 =

4x3/5 = 12/5

iii) 7 x 1/3 =

7x1/3 = 7/3

26.59 × 10 

Number of zeroes in 10 is one. 

So, decimal point has to shift to one place right in the product. 

∴ 26.59 × 10 = 265.9

 4/5 of 45 is 36

8/45=8x2/45x2=16/90 Now.16/90<16/89.So.8/45<16/89 another method: 8 89=712 and 16 45=720 As 712<720.therefore 8/45<16/89

The correct answer is 3.4

The correct answer is 12/25=12x4/25x4=48/100=0.48

The correct answer is 0.55

Each interior angle of a regular polygon

=  \(\frac {3\pi}{4}\)= (\(\frac{3\pi}{4}\)x\(=\frac{180}{\pi}\))°= 135°

Interior angle + Exterior angle = 180° 

∴ Exterior angle = 180° – 135° = 45° 

Let the number of sides of the regular polygon be n. 

But in a regular polygon, exterior angle = 360^∘/no. of sides

∴ 45^∘= 360^∘/n

∴ n = 360^∘/45^∘=8

∴ Number of sides of a regular polygon = 8.

i. (c) Endorser

ii. (a) Endorsee

iii. (a) 14th August

iv. (b) 14th August 2020

v. (a) 14th August 2020

Correct answer is (a) Protein

i. (a) Drawee

ii. (c) Draft

iii. (b) preceding

iv. (d) 25th Jan. 2020

v. (b) Drawee

Correct answer is (d) Vit D

H₂ represents one molecule of hydrogen which is formed by the bonding of two separate hydrogen atoms. 2H represents two separate atoms of hydrogen.

Valency can be considered as the Combining capacity of an element. Ex:

(a) Oxygen gas occurs as a diatomic molecule in nature. 

(b) Noble gases occur as monoatomic gases in nature.

The same element may exhibit different valencies in different compounds and this property is called as variable valency. 

Ex : Iron has 2 valencies. 

Ferric has 3 valencies It is because the number of electrons from the iron atoms which participate in the chemical reaction will be either 2 or 3 depending upon conditions.

Mitochondria are the sites of respiration in the cell where glucose in oxidized to release carbon dioxide water and energy. This energy is stored in the form of ATP. Hence. They are called as the power houses of the cell.

Each chloroplast is covered by a double membrane. The inner membrane encloses a matrix. Consists of stroma and grana. Grana has chlorophyll plays an important role in preparing food.

Lysosomes are spherical sac like cytoplasmic organelles which contain a variety of hydrolytic enzymes. 

Function of Lysosomes are:

1. It helps in digestion of organic substances present 

2. Lysosomes destroy their own cell, when it becomes old, weak, damaged or diseased by autolysis. 

3. Suicide bags of the cell.

Golgi complex consists of different types of structures, some are tube like, a few are it the form of granules. Function : The main function of Golgi complex is to secrete chemicals required for cellular activities.

Mitochondria occur in various shapes, such as, cylindrical, oval, and rod shapes. Each mitochondrion is bound by a double membrane. The outer membrane is smooth while inner membrane produces finger like projection called cristae. The inner membrane encloses a mass known as matrix. Mitochondria are the site of respiration in a cell.

A number of living substances in the cytoplasm that carry out life processes are called organelles. Or organelles are the specialized structure found in the cell. They carry out specific functions. 

They are grouped under two categories. They are : 

1. Membranous organelles.

 2. Non membranes organelles.

Lysosomes destroy their own cell, when it becomes old weak damaged or diseased by autolysis. Hence they are called as the suicide bags of the cell.

water does not gather in a empty potato kept in a trough whit water because potato cup is empty. It is he control step in the experimenter.

Cytoplasm is a jelly like substance found within the cell membrane. It is the seat for most of the cellular activities.

Nerve Cell: A Nerve cell is long and has branched fiber like structure. It carries messages from one part of the body to another. 

RBC : A, red blood cells is biconcave and round in shape. It transport oxygen to different parts of the body of an organism.

1 Octet configuration 

2 Zero valency 

3 Inner in nature 

4 Chemically stable 

5 No free electrons are available for chemical process

Correct answer is (c) Vit C

(d) mosquito

Weakness is the symptoms of anaemia.

The sites of protein synthesis in the cell are ribosomes.

1. (c) 

2. (f) 

3. (a) 

4. (g)

The functions of cell membrane are:

1. It Separates the interior of the cell from out side environment. 

2. Cell membrane forms the boundary of the cell. 

3. It helps to maintain the shape of the cell. 

4. It controls the movement of selected substances in to or out of it.

The main chemical component of the cell wall is cellulose.

The organelle, which is called the kitchen’of the plant cell is chloroplast.

(1) – (b), 

(2) – (d), 

(3) – (a), 

(4) – (e), 

(5) – (c).

The compounds of carbon, hydrogen and oxygen which provide energy for our body are called carbohydrates.

1. Carbohydrates

2. Nitrogen

3. Energy

4. Vitamins and Mineral salts

5. 70

The organelle which controls the various activities of the cell, is nucleolus.