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24051.

The oxidizing agent used for conversion of alcohols to carboxylic acids is ……………. A) Alkaline potassium dichromate B) Manganese dioxide C) Acidified potassium dichromate D) Both A and C

Answer»

D) Both A and C

24052.

Unsaturated organic compounds participate in …………….. reactions. A) substitution B) addition C) elimination D) rearrangement

Answer»

Correct option is  B) addition

24053.

The catalyst used in hydrogenation of oils is ……………….. A) Pd B) Pt C) Ni D) Co

Answer»

Correct option is  C) Ni

24054.

The elements a, b, c, d have the following electron configurations. Then the elements that belong to the same group of periodic table is a) 2,3 b) 2,8,3 c) 2,8,5 d) 2,8,7 A) a, b B) b, c C) c, d D) d, a

Answer»

Correct option is  A) a, b

24055.

A brown gas is obtained when metals are reduced by nitric acid ?(a) N2O(b) N2O3(c) NO2(d) NO

Answer»

The answer is (c) NO2

24056.

The value of KC for the reaction 2A ⇌ B + C is 2 x 10-3. At a given time, the composition of reaction mixture is [A] [B] [C] = 3 x 10-4 M. In which direction the reaction will proceed?

Answer»

For the reaction, the reaction quotient Q is given by 

QC = ([B] [C]) / [A]2 

as [A] = [B] = [C] = 3 x 10-4

QC = (3 x 10-4)(3 x 10-4) / (3 x 10-4)2 = 1

as QC > KC so, the reaction will proceed in the reverse direction.

24057.

म्यूरेट ऑफ पोटाश में प्रतिशत पोटैशियम की मात्रा पाई जाती है-(क) 40(ख) 50(ग) 60(घ) 70

Answer»

सही विकल्प है (ग) 60

24058.

वजन के आधार पर वायुमण्डल में प्रतिशत नाइट्रोजन पाया जाता है-(क) 60(ख) 70(ग) 78(घ) 90

Answer»

सही विकल्प है (ग) 78

24059.

नाइट्रोजन उर्वरकों का वर्गीकरण करके पौथों के लिए इनका महत्त्व लिखिए।

Answer»

नाइट्रोजन उर्वरकों का वर्गीकरण-

(i) नाइट्रेट उर्वरक-

  1. सोडियम नाइट्रेड- 16% नाइट्रोजन
  2. कैल्सियम नाइट्रेट- 15% नाइट्रोजन। इन उर्वरकों का प्रयोग खड़ी फसल में छिड़काव के रूप में किया जाता है।

(ii) अमोनियम उर्वरक-

  1. अमोनियम सल्फेट- 20% नाइट्रोजन
  2. डाई अमोनियम फॉस्फेट- 18% नाइट्रोजन । नाइट्रोजन अमोनियम रूप में मिलता है। इन उर्वरकों को मिट्टी में मिलाया जाता है।

(iii) अमोनियम और नाइट्रेट उर्वरक-

  1. अमोनिया नाइट्रेट- 33.5% नाइट्रोजन
  2. अमोनियम सल्फेट नाइट्रेट-26% नाइट्रोजन। इन उर्वरकों को बोआई के समय खेत में मिलाया जाता है।
पौधों के लिए नाइट्रोजन का महत्त्व- यह पौधों की वृद्धि में सहायता करता है। कार्बोहाइड्रेट की मात्रा बढ़ाता है। अनाजों के उत्पादन एवं प्रोटीन की मात्रा में वृद्धि करता है।
24060.

State the trends in the following properties of group 1 and group 2 elements down a group. i. Atomic radiiii. Ionic radii iii. Ionization enthalpy iv. Electronegativity v. Standard reduction potential

Answer»
Sr. no.PropertyDown a group
iAtomic radiiIncreases
iiIonic radiiIncreases
iiiIonization enthalpyDecreases
ivElectronegativityDecreases
vStandard reduction potentialDecreases

24061.

What is the oxidation state of:i. Na in Na2O2?ii. K in KO2?

Answer»

i. Oxidation state of Na in sodium peroxide (Na2O2):

Let x be the oxidation state of Na in Na2O2

The net charge on peroxide ion (O\(^{2-}_{2}\)) is -2.

Since any compound is electrically neutral, it has an overall charge as zero.

∴ 2x + (-2) = 0 

∴ x = + 1 

∴ Oxidation state of Na in Na2O2 is + 1

ii. Oxidation state of K in potassium dioxide/potassium superoxide (KO2):
Let x be the oxidation state of K in KO2

The net charge on superoxide ion (O-2) is -1

Since any compound is electrically neutral, it has an overall charge as zero.

∴ x + (-1) = 0 

x = + 1 

∴ Oxidation state of K in KO2 is + 1. 

[Note: Oxidation state of alkali metal is always +1.]

24062.

35 का एक गुणनखण्ड 5 है तो इसका दूसरा गुणनखण्ड क्या होगा?

Answer»

संख्या = 35, पहला गुणनखण्ड = 5, दूसरा गुणनखण्ड = ?

दूसरा गुणनखण्ड = 35 + 5 = 7

24063.

10 और 20 के बीच की सभी अभाज्य संख्याएँ लिखो।

Answer»

11, 13, 17, 19

24064.

30 के तीन अभाज्य गुणनखण्ड हैं। एक गुणनखण्ड 2 है। अन्य दो गुणनखण्ड होंगे-(क) 2, 3 और 5(ख) 10 और 3(ग) 15 और 2(घ) 3 और 5

Answer»

(घ) 3 और 5 

 एक गुणनखण्ड 2 है। 

∴ 3 और 5 दो गुणनखण्ड होंगे

24065.

निम्नलिखित में कौन-कौन 12 के अपवर्तक नहीं हैं?1, 2, 3, 4, 5, 6, 7, 8, 12

Answer»

5, 7, 8 12 के अपवर्तक नहीं हैं।

24066.

निम्नलिखित में कौन-कौन सी भाज्य संख्याएँ हैं?3, 6, 7, 9, 11, 13, 17, 25, 44, 77, 31

Answer»

भाज्य संख्याएँ = 6, 9, 25, 44, 77

24067.

निम्नलिखित संख्याओं के अभाज्य गुणनखण्ड लिखो-(क) 15(ख) 36(ग) 45(घ) 56

Answer»

(क) 15 = 1 x 3 x 5

(ख) 36 = 1 x 2 x 2 x 3 x 3

(ग) 45 = 1 x 3 x 3 x 5

(घ) 56 = 1 x 2 x 2 x 2 x 7

24068.

सही (✓) का निशान लगाओ-(क) क्या 19 अभाज्य संख्या है? हाँ । नहीं(ख) क्या 24 अभाज्य संख्या है? हाँ / नहीं

Answer»

(क) हाँ (✓)

(ख) नहीं (✓)

24069.

सही उत्तर पर (✓) चिह्न लगाओ-(क) 71 का गुणनखण्ड 8 है? हाँ । नहीं(ख) 81 का गुणनखण्ड 9 है हाँ । नहीं

Answer»

(क) नहीं (✓)

(ख) हाँ (✓)

24070.

क्या अनमोल है ?

Answer»

जीवन अनमोल है।

24071.

बच्चों को सड़क पर जाकर क्या नहीं करना है ?

Answer»

बच्चों को सड़क पर जाकर खेलना नहीं चाहिए।

24072.

घायल को फौरन कहाँ पहुँचाना चाहिए ?

Answer»

घायल को फौरन अस्पताल पहुँचाना चाहिए।

24073.

बाट जोहने वालों को क्या नहीं देना चाहिए ?।

Answer»

बाट जोहनेवालों को गम का तोहफा नहीं देना चाहिए।

24074.

हेलमेट के बिना कौन चलते है ?

Answer»

हेलमेट के बिना नासमझ लोग चलते हैं।

24075.

सही (✓) और गलत (✗) चिह्न लगाइएः1.   सडक पर चलते समय खेलना है। (    )2.   समझदार हेलमेट पहनकर वाहन चलाते हैं। (    )3.   घर पर इन्तजार करने वालों को गम का सौगात देना है। (    )4.   दुर्घटना होने पर न आँख चुराना है। (    )5.   घायल की मदद नहीं करनी चाहिए। (    )6.   हमें चलती बस में चढ़ना नहीं चाहिए। (    

Answer»

1.   सडक पर चलते समय खेलना है। ( ✗  )

2.   समझदार हेलमेट पहनकर वाहन चलाते हैं। (  ✓  )

3.   घर पर इन्तजार करने वालों को गम का सौगात देना है। (  ✗  )

4.   दुर्घटना होने पर न आँख चुराना है। (  ✓  )

5.   घायल की मदद नहीं करनी चाहिए। (  ✗  )

6.   हमें चलती बस में चढ़ना नहीं चाहिए। (  ✓  )

24076.

अनुशासन ही शासन है कहानी का सारांश लिखें।

Answer»

अनुशासन ही शासन है (कविता) पद्य का सारांश –

चलती बस में न कभी चढना चाहिए और न उतरना चाहिए। सडकों पर खेलकर अपने आप को मुसीबत में नहीं डालना चाहिए। बच्चों तुम सडक पर पैदल चलो या साईकिल चलाओ, अंधा धुंद होकर मत चलना। हमेशा हेलमेट पहनकर ही गाडी चलाना चाहिए। बिना हेलमेट अगर गाडी चलाओ तो कोई भी दुर्घटना हो सकती है। समझदारी से काम करो और अपने आप को सुरक्षित रखो। हमेशा इस बात का खयाल रहे कि घर में आपकी कोई राह देख रहा है। उनको दुख का तोहफा मत दीजिए।

सडक पर जाते समय आपके सामने अगर कोई दुर्घटना हो जाए तो अपनी जिम्मेदारी से मुँह मत फेरना, घायल की मदद करना, उसे अस्पताल में दाखिल कराना आपका कर्ज बनता है। जीवन अनमोल है। उसे बचाना चाहिए। सडक पार करते समय चौराहों पर दिए गए। यातायात के संकेतों को ध्यान से देखकर उनका पालन करे। जो इनका पालन करते हैं वो ही सडक दुर्घटना से बचते है।

24077.

Why did Appa first choose the most ripe mangoes to be used for making the mamidi tandra?

Answer»

To make mamidi tandra, first they bought a mat, casurina, poles, string made of coconut husk, some jiggery and sugar. In a sunny spot in the backyard they made a high platform by using poles and mat. Then in a vessel, they extracted out pulp and juice from ripe mangoes and after adding jiggery and sugar in equal amount, they spread this pulp into a thin layer over the mat. The thin layer was left to dry in the sum. The process was repeated day after day until the layer grew four centimeters thick. Then after a few days, the layer was taken out and cut into pieces.

24078.

Is there any kind of pickle made in your house? What kind of pickle is it? Who makes it? From whom did they learn to make the pickle?

Answer»

Yes, in my house pickles of mango, lemon, amla and chilli are made. My another makes these pickles. She learnt this from her mother.

24079.

What things are made in your house from ripe and unripe mangoes?

Answer»

In my house pickles, chutney etc. are made from unripe mangoes and aam papad is made from ripe mangoes.

24080.

Will your list be the same in all reasons?

Answer»

In winters, green vegetables may not spoil in two three days. Similarly, if pickles, murabba etc. are not kept safe from moisture in rainy season, they may get spoiled soon.

24081.

What all things are needed to make any one type of pickle in your house. How is the pickle made? Find out the reage and write.

Answer»

To make a pickle, the things needed are the fruit or vegetable of which pickle has to made garlic, chillii powder, turmeric powder, ginger, aniseed, methi, salt, mustard oil etc. Procedure to make a pickle: First the fruit or vegetable of which pickle is to be made is cut and dried up thoroughly in the sun. Then after mixing it with all the spices, salt and oil, it is kept in a dry glass jar and left undisturbed for a few weeks. In this way pickles are made.

24082.

What can we know from what is written on the packet?

Answer»

We know about the price, weight, manufacturing date and expiry date of the products

24083.

When food gets spoiled in your house, what do you do with it?

Answer»

When food gets spoiled in my house, we dump it in garbage box.

24084.

Have you ever seen some food that has gone spoiled? How did you know that it has supplied?

Answer»

Yes I have seen foods that have gone spoiled. When the food spoils, it smells bad and its colour also changes.

24085.

Glass jars and bottles are dried well in the sun before filling them with pickles. Why is this done? Do you remember what happened to the bread in the experiment?

Answer»

This is done to make these glass jars and bottles moisture free. I do remember what happened to bread in the experiment. When a moist bread was left in a cool, damp place, it spoiled due to fungus. If any moisture is left out in these containers, the result may be the same.

24086.

It is a two-day journey by train from Pune to Kolkata. If you were to go on this trip, what food items would you carry with you? How would you pack them? Make a list on the blackboard of all the packed food. What food would you eat first?

Answer»

I will carry those food items which would not get spoiled up to two or three days and will keep these things in dry containers or packets. 

I will carry roti or paranthas, subji, biscuits, chips, fruits, dry fruits, curd, sattu, chiwda, sweets like peda, lady, murabba, etc. 

First I will consume roti or paranthas, curd and subji, because these can spoil soon.

24087.

The whole class can do this experiment together. Take a piece of bread or roti. Sprinkle a few drop of water on it, and put in a box. Close the box. See the bread or roti everyday until you find some changes on it. Make this table on a chart paper and put it up in the classroom. Fill up the chart everyday after discussing the changes seen.

Answer»
Day                  

 
Changes in the Bread or Roti
By touch                          By Smell                               By looking Through hand lensBy colour
1Clammy, Soft                                Clammy, Soft                                  NormalNormal
2-do--do-A velvet like white layerSlightly white                         
3Moist, softStinking smell-do-White
4-do--doGreenish-white coloured small grass like structuresGreenishwhite
5-do--doGreen-coloured Small grass Like structuresGreen
6-do--doGreenish-black coloured small Grass like structuresGreenishblack

24088.

Raindrops of different radii are falling through air. The terminal velocity of a drop of radius r will be proportional to (a) r3 (b) r2 (c) r (d) 1/r

Answer»

Correct Answer is: (b) r2

Terminal velocity is reached under the condition

6πηrv = 4/3 πr3 (ρ - σ)g

where the symbols have their usual meanings. Thus, v ∝ r2.

24089.

A large drop of oil, whose density is less than that of water, floats up through a column of water. Assume that the oil and the water do not mix. The coefficient of viscosity of the oil is η0 and that of water is ηw. The velocity of the drop will depend on (a) both η0 and ηw (b) η0 only (c) ηw only (d) neither η0 nor ηw

Answer»

Correct Answer is: (c) ηw only 

Forces of viscosity arise in a fluid when different sections of the fluid move with different velocities. Here, there is no such motion inside the oil drop and hence the viscosity of oil does not come into play.

24090.

A liquid drop at temperature t, isolated from its surroundings, breaks into a number of droplets. The temperature of the droplets will be (a) equal to t (b) greater than t (c) less than t (d) either (a), (b) or (c) depending on the surface tension of the liquid

Answer»

Correct Answer is: (c) less than t

The total surface area of the droplets is greater than that of the single drop. Hence, they have greater surface energy. This extra energy must be drawn from the internal energy of the drop.

24091.

How can find Splitting of Bigger Drop ?

Answer»

When a drop of radius R splits into n smaller drops, (each of radius r) then surface area of liquid increases. 

R3 = nr3 

Work done = T × ∆A = T [Total final surface area of n drops – surface area of big drop] = T[nπr2 – 4πR2].

24092.

A hydraulic lift is designed to lift heavy objects of maximum mass 2000 kg. The area of cross-section of piston carrying the load is 2.25 × 10-2 m . What is the maximum pressure the piston would have to bear?(A) 0.8711 × 106 N/m2(B) 0.5862 × 107 N/m2(C) 0.4869 × 105 N/m2 (D) 0.3271 × 104 N/m2

Answer»

Correct answer is: (A) 0.8711 × 106 N/m2

24093.

State whether true or false. Rate of pulse is equivalent to that of the heartbeat.

Answer»

Rate of pulse is equivalent to that of the heartbeat is True

24094.

What is pulse?

Answer»

The wave-like movement formed due to the contraction and relaxation of the heart is felt throughout the walls of the arteries is pulse.

24095.

Two capillary tubes of radii 0.3 cm and 0.6 cm are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is(A) 1:2 (B) 2:1 (C) 1:4 (D) 4:1

Answer»

Correct answer is: (B) 2:1

24096.

………. helps to maintain the level of oxygen in the blood.

Answer»

Double circulation helps to maintain the level of oxygen in the blood.

24097.

Average heartbeat is

Answer»

72 times/minute

24098.

The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly(A) 0.9 × 10-3 J (B) 0.4 × 10-3 J (C) 0.7 × 10-3 J (D) 0.5 × 10-3 J

Answer»

Correct answer is: (A) 0.9 × 10-3 J

24099.

What are the important parts of blood?

Answer»

Fluid part named plasma and blood cells.

24100.

Oxygen is absorbed into the blood from

Answer»

Oxygen is absorbed the blood from Lungs