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Microwaves of frequency 1 GHz to 300 GHz bounces from even the smallest aircraft so that they are suitable to avoid getting bombed. Microwaves can penetrate through clouds also.

X-Rays 

Frequency range : 3 x10¹⁶Hz – 3 x 10¹⁹Hz.

X-rays 

Uses: (i) To study crystal structure. 

(ii) to detect fracture in bones, stone in gall bladder and kidney etc.

A political party which is a recognised party in less than four states is deemed as a State party. Besides, the party should win at least one seat for every 25 Lok Sabha seats allotted to that State. If that is not possible, the candidates set up by the party should win at least one seat in the Lok Sabha from the State in the general election. 

Taking cos² θ common from R₁, cosθ sinθ from R₂ and sinθ from R₃, then R₂ → R₁, 

R₃ → R₃ – R₁ and expand 

f(θ) = 1 

f(π/3) = 1

p = 2 – a => a + p – 2 = 0 

∴ a³ + 6ap + p³ – 8 = (a)³ + (p)³ + (-2)³ – 3a x p x (-2) 

a³ + 6ap + p³ – 8 = {a + p + (-2)} {a² + p² + (-2)² – ap – p(-2) – a(-2)} 

= (a + p – 2) (a² + p² + 4 – ap + 2p + 2a) 

= 0 x (a² + p² + 4 – ap + 2p + 2a) = 0 

So, a³ + 6ap + p³ – 8 = 0

(i) Democratic style.

(ii) Two positive aspects of communication which Sandhya is using as an intelligent manager are:

(a) It carries information rapidly and therefore may be useful to the manager at times.

(b) It is used by the manager to transmit information so as to know the reaction of his/ her subordinates. 

Let ∠OBC = x°   

∠BOA = 60°

Hence ∠BCA = 30° 

(Angle at the centre is double the angle at the circumference subtended by the same chord)

By angle sum property of ΔBDC

30° + 100° + x° = 180°

130° + x° = 180°

x = 180° - 130°

x = 50°

(a) H = 30 cm, r = 7 cm (for cylinder)

h = 24 cm (for cone)

Total surface area of remaining solid

= CSA of cylinder  + CSA of cone + base area of cylinder

 = 2πrH + πrl + πr²

 = πr(2H + l + r)

 = 22/7 x 7 (60 + 25 + 7)

 = 22 x 92

 = 2024 cm²

(b)  flow rate = 12km/h

time = 1 hour

b = 8m

h = 6m

lbh = LBH

lbh = Area x H

12 x 8 x 6 x 1000 = Area x 5/100

⇒ Area = 12 x 8 x 6 x 20 x 1000

 = 11520,000 m²

Let 100 be the nth term of the given AP 

25, 28, 31, .......... , 100

a = 25, d = 3 

Let the number of terms be ‘‘n’’. 

∴ 25 + (n – 1) × 3 = 100 

⇒ (n – 1) × 3 = 75

⇒ n = 26 

Hence, 100 is a term of the given AP

No. 

15 does not divide 175. 

LCM of two numbers should be exactly divisible by their HCF.

∴ Two numbers cannot have their HCF as 15 and LCM as 175.

Differences between thermosetting and thermoplastic polymers.

Interhalogen compounds are more reactive reason being X – X^– bonds in interhalogen compounds is weaker than X – X bond in halogens (Except F – F), and all these undergoes hydrolysis easily giving halide (from smaller halogen) and hypohalites, halites etc. from larger halogen.

Food hygiene is “safe handling of food in a way that will keep it safe and free from all contaminants.”

 When an article is excessively blue 

(1) dip it in vinegar 

(2) Rinsing in clean water 

Two common features of childhood are – 

1. learning to get along with age mates 

2. learning physical skills 

3. learning to follow social rules 

4. developing sense of morality and pattern of values

When an article is excessively blue 

1. dip it in vinegar 

2. Rinsing in clean water 

Cleaning agents are as follows: 

Soap, Detergent, Liquid, any other 

The following facts and reactions cannot be explained by open chain structure of glucose.
(i) Despite having the aldehyde group, glucose does give 2, 4-DNP test, Shiff’s test and it does not form the hydrogen sulphite addition product with NaHSO₃.
(ii) The penta-acetate of glucose does not react with hydroxylamine indicating the absence of free aldehydic group.

C₂H₅NH₂< C₆H₅NHCH₃< C₆H₅NH₂

Add chloroform in the presence of KOH and heat , Aniline gives a offensive smell while N,N dimethylaniline does not.

It is process in which  a mix of 3 parts or ferric oxide n 1 part of aluminium powder is taken in a crucible with hole at bottom n ignited using a ,mix of potasium chlorate n magnesium powder using a fuse of burning magnesium.

A vigorous reaction result in high temp n formation of molten iron n aluminium which drops down from hole so this process is used for welding broken iron girders or rails  it is called thermite process because mix of ferric oxide n aluminium is called thermite.

(i) Hard water contains calcium and magnesium salts. In hard water, soaps get precipitated as calcium and magnesium soaps which being insoluble stick to the clothes as gummy mass.
(ii) Chloroxylenol and a-terpineol in a suitable solvent.

(iii) Antiseptics are chemical substances which prevent the growth of microorganisms and may even kill them but are not harmful to human or animal tissues. Examples are dettol and savlon. They are generally applied on wounds, ulcers, cuts and diseased skin surfaces. Furacin and soframycin are well-known antiseptic creams.
Disinfectants are chemical substances which kill microorganisms but are not safe to be applied to the living tissues. These are generally used to kill microorganisms present in the toilets, drains, floors, etc. Some common examples of disinfectants are phenol (³1% solution) and chlorine (0.2 to 0.4 ppm).

Order of a reaction may be defined as the sum of the powers of the concentration terms of the reactants in the rate law expression.

The catalysis in which the pore structure of the catalyst and the size of the reactant and product molecules are comparable is called shape selective catalysis.

The naturally occurring chemical substances present in the earth’s crust which can be obtained by mining are called minerals, while mineral from which metals can be extracted economically are called ores.

The steady decrease in the atomic and ionic radii (having the same charge) with increase in atomic number as we move across the series from lanthanum to lutetium is known as lanthanoid contraction.

(i) NH₃ is stronger base than PH₃. This is because the lone pair of electrons on N atom in NH₃ is directed and not diffused as it is in PH₃ due to larger size of phosphorus and hence more available for donation.

(ii) Sulphur has a greater tendency for catenation than oxygen because S-S bond is stronger than O – O bond due to less interelectronic repulsions.

(iii) Bond dissociation energy of F₂ is less than Cl₂ this is due to relatively large electron – electron repulsion among the lone pairs in F₂ molecule where they are much closer to each other than in case of Cl₂.

R = {(1, 1) (1, 2), (1, 3), (1, 4), (1, 5), (1, 6), (2, 2), (2, 4), (2, 6), (3, 3) (3, 6), (4, 4), (6, 6)} 

Domain of R = {1, 2, 3, 4, 6} 

Range of R = {1, 2, 3, 4, 6}

Since, according to the Gauss’ law of electrostatics, electric flux through any closed surface is given by,

\(\phi_E = \oint E \cdot S = q/ \varepsilon_0\) ....(i)

Where, e = electrostatic field

q = total charge enclosed by the surface

ϵ₀ = absolute electric permittivity of free space so, in the given case, cube encloses an electric dipole. Therefore, the net charge enclosed within the cube is zero. i.e. q = 0.

Therefore, from Eq. (i), we have ϕE = q/ϵ₀ = 0 i.e. electric flux is zero.

Mrs Packletide wanted to hunt a tiger, but in reality she hunted a goat. Mrs. Packletide's showy nature brought only hollowness and shallowness for her. A person can be great by great thinking and good actions not by money and vaingloriousness.

     LETTER WRITING

Note: - No marks are to be awarded if only the format is given.

Credit should be given for the candidate's creativity in presentation of ideas.

Use of both the traditional and the new format is permitted.

Mixing of the formats is not permitted

Format

1. sender's address

2. date 

3. receiver's address

4. subject /heading

5. salutation

6. closing

Content

Expression

grammatical accuracy, appropriate words and spelling

coherence and relevance of ideas and style

LETTER 

–Placing an order for musical instruments Suggested Value Points 

- reference to advertisement / correspondence / telephone conversation

- details of the order

1. musical instruments

2. numbers / quantity

3. discount on catalogue prices

- terms and conditions

(optional)

1. delivery time

2. advance payment/mode of payment

3. price

4. make / brand

- any other relevant point

(any 3 points)

Detailed Answer :

Vasant Public School

Pune

February; 26, 2018

The Manager

Melody House

Pune

Subject— : Placing an order for musical instruments

Dear Madam/Sir,

Thank you for the catalogue that you had sent with the latest price list. After going through it, we would like to place an order for the following items— :

Product                Quantity

Guitar                        6

Tabla                         3

Drums                        3

Trumpet                     2

Piano                        6

Attached herewith is a draft of 30% advance payment. Rest of the payment will be made after the delivery of the listed items. Also, kindly provide necessary discounts on the products.

Thanking You

Yours sincerely

Neerja Shekhar

(a) fertilizer 

(b) sedentary

(i) Acts as fertilizer for the brain/ creates rich capillary beds not only in leg and hip muscles but also in the brain/ multiplication of nerve cells/ release of neurotransmitters/ faster functioning / more oxygen and nutrients to the brain.

(ii) Gives his brain an extra boost /enjoys benefits of cycling / can score higher on tests of memory, reasoning and planning/ can complete tests faster after pedalling.

 Detailed Answer :

Ravi does a circuit of ‘ride, work, ride’ because he wants to stay focused. After cycling to work, his brain is at the peak of activity level. After a few hours when his mental focus level comes to a halt, he starts it with another short session of cycling.

(iii) Act as messengers between brain cells/ cells can communicate with each other for better, faster functioning.

(iv) Elevates mood / relieves anxiety/ increases stress, resistance/ banishes the blues/prevents depression.

Detailed Answer : Cycling elevates one’s mood, relieves anxiety and increases stress resistance. It can even prevent depression in the long run.

(v) sharpens memory /increases concentration levels/ enhances fluid thinking/enhances problem solving ability/ restores and protects the brain cells.

(vi) When one first exercises, body releases a particular hormone to raise heart rate, blood pressure, blood glucose levels.   

(a) (iii) Cycling on the stationary bike.

(b) (ii) The brain is strengthened by multiplying them.

(i) Rain falls five months a year in Nagaland / it is ignorant to think that it is the same rain falling everyday/ because rain is always doing different things at different times/ tells them when to sow and harvest/ rain may be gentle and rain that is too hard, damages crops.

Detailed Answer :

The elders want the children to understand the rains in the Naga hills because it rains there 5 months a year and one must learn to distinguish between the different types of rain.

 (ii) Announces the end of the rain.

(iii) Season of weeklong rains (when clothes don’t dry, fungus forms on the floor) /cannot see the moon or the stars because of rain clouds/ big rain in May/rain in May accompanied with lightning and thunder.

(iv) Agriculture/farming.

Detailed Answer :

Agriculture’ or farming is the occupation of more than 70 percent of the population of Naga Hills.

(a) -city people dislike monsoon/find it depressing because of landslide, muddy streets, periodic infections -farmers remain grateful for the rainy days.

(b) A few weeks before the harvest/ at the end of October.

Detailed Answer : The months of rain become a distant memory in the minds of the people of the Naga Hills until it starts all over again.

(vii) (i) Blossoming / to bloom 

 (ii) Incessant / continuous

(a) (iii) It is believed that the plants bring the rain.

(b) (i) It tells them when to sow and when to harvest.

(c) (i) It brings mud and sickness with it.

(d) (iii) The crops need the sun and heat to ripen. 

                                                             ‘Save Trees, Trees Save‘

Dear Friends,

Trees are as much important to our life as food and water. Life becomes very difficult without trees or we can say that life would be finished because trees are most important aspect of giving us healthy and wealthy life. Save trees is the important social awareness now-a-days. Save trees is a slogan used to motivate people to save trees and plant more trees in the surrounding areas by spreading the importance of trees among people as well as reduce deforestation and cut down of trees. 

Trees give us life directly and indirectly as they are the source of oxygen production, CO₂ consumption and of rain. They are the most precious gift to the humanity on the earth from nature for which we must be grateful. We must give honour and preserve them for the wellness of mankind.

We should understand the importance of trees in our lives and do our best to save trees in order to save life, save environment on the earth and make earth a green earth. Trees are as valuable as gold that’s why they are called as “Green Gold” on the earth. They are the real source of health as well as wealth because they give us oxygen, cool air, fruits, vegetables, medicines, water, wood, furniture, shadow, fuel to burn, houses, fodder to animals and other useful things. They consume all the CO₂ , refresh air from toxic gases and prevent us from the air pollution.

Trees are the source of rain on the earth as they attract clouds which ultimately bring rain. They also help in checking soil erosion. They help in maintaining ecological balance in environment. We should understand the roles and importance of trees in our life and take a pledge not to destroy them as well as encourage people to plant more trees.

Just Remember : 

No trees, no oxygen 

No oxygen, no life

No forest, no rain 

No rain, no life 

No forest, no animals 

No animals, hard life.

So let us all take a pledge that each one of us will plant atleast one tree in one year. And we will first save trees, then only trees will save us.

Thank you !

 Hello, Virat we are honoured to have you as our chief-guest on our ‘Annual Sports Prize Distribution’ today. You are our favourite sportsman, we all are your biggest fans and we all love your devotion in sports. Sorry, to take your valuable time. Hope you wouldn’t mind me (the sports secretary of this school) asking you certain questions to motivate our players. Thank you.

(1) When did you first played your Ranji trophy ? 

(2) What was your score in that match ? 

(3) Who is your idol in cricket ? 

(4) Who supported you in your early stage ? 

(5) Can you tell me the best moment you enjoyed the most in this game ? 

(6) Who is your inspiration ? 

(7) How many half centuries and centuries have you achieved in the International cricket matches till today ?

(8) Who is your favourite bowler ? 

(9) Since you are married now, how do you manage to spare time for your private life ? 

(10) What will be the message you wish to give young players of this school ?

(a) For many generations people have relied on dogs./People have relied on dogs for many generations. 

(b) They are very loyal. 

(c) They have been used for hunting and companionship. 

(d) A dog’s nose and ears are very sensitive.

(a) Loan taken from bank

(b) Additional capital brought in by the owner