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651.

Study the table and answer the questions 155 सेमी या अधिक लम्बाई वाली लड़कियों की औसत ऊचाई बताये ।A. `158.7`B. `159.8`C. `160.4`D. `162.6`

Answer» Take value of class interval 155-1 60 and 160 -165 i.e. 157.5 and 1 62.5 Multiply them by their respective frequency and then divide by
total no. of girls `=(157.5xx 6+162.5xx5)/(11)`
`=(945+812.5)/(11)=(1757.5)/(11)=159.8cm`.
652.

Study the graph and answer the questions किस वर्ष में कूल उप की बिक्री न्यूनतम थी ।A. 1990B. 1992C. 1993D. None of above

Answer» It is clear from the graph
Minimum sales is in 18989=55 lakh bottles
653.

Study the graph and answer the questions वर्ष 1988-1993 की समयावधि में किस पैकी औसत बिक्री न्यूनतम रही ।A. pep-up onlyB. Cool-up onlyC. Dew-drop onlyD. Dew-drop and Cool-up

Answer» Average annual sales of Dw -drop
`=(10+15+15+15+30+25)/(6)=(110)/(6)=18.3`
lakh bottles
Average sales of cool up`=(120)/(6)=20` lakh bottles
654.

निर्देश :- बार चार्ट का अध्ययन कीजिये और प्रश्नो के उत्तर दीजिये । यदि कंपनी Q की आय 2001 में 2000 की तुलना में `10%` अधिक हुई और कंपनी को 2000 में `20%` का लाभ हुआ था तो 2000 में व्यय कितना (करोड़ रू ) हुआ था ?A. `32.32`B. `28.28`C. `34.34`D. `29.09`

Answer» Income of company q in 2001=40
Income of company Q in 2000`=40xx(100)/(110)=36.36`
Profit in 2000=36.36`xx( 20)/(100)=7.27`
`therefore` Expenditure in 2000=`36.36 -7.27=29.09`
655.

The graph given below shows the daily income of 50 workers in a factory Study the graph and answer the questions कारखाने में मजदूरी का औसत माध्य कितना है ।A. रू 140B. रू 138C. रू 150D. रू 160

Answer» Median `=(L.V+H.V)/(2)=( 120+200)/(2)=Rs. 1 60`
656.

Study the graph and answer the questions वर्ष 1989 की तुलना में वर्ष में 1990 कूल उप की बिक्री में कितने `%` की बढ़ोतरी हुई ।A. 100B. 50C. 216D. 150

Answer» Sales of cool up in 1989=6lakh bottles
Sales of cod sip in `1990=19` lakh bottles
Rquired percent `=(19-6)/(6)xx100=(13)/(6)` lakh bottles
657.

Study the following graph and answer the questions 2001 2002 से तक आय में कितने `%` कमी आयी ।A. `50%`B. `33%`C. `25%`D. Data inadequate

Answer» `2001:(1)/(E)=(1)/(1)=(4)/(4)`
`2002.(1)/(E)=(75)/(100)xx(3)/(4)`
Income %=`(4-3)/(4)xx100=25%`
658.

The graph given below shows the daily income of 50 workers in a factory Study the graph and answer the questions कितने `%` कर्मचारी रू 150 तथा रू 180 के बीच कमाते है ।A. `6%`B. `16%`C. `12%`D. `20%`

Answer» Wages Numbers of workers
120 12
140 26-12 =14
160 34-26=8
180 40-34= 6
200 50-40=10
`therefore ` rquired percentage `=(8)/(50)xx100=16 %`
659.

Study the pie chart and table given below and answer the questions Details of percentage of employees working in various departments in an organization and number of males among them total number of employees =800 HR विभाग में कार्यत में महिलाओं तथा HR विभाग में कार्यत कुल कर्मचारियों की संख्या में अनुपात बताये ।A. `7:10`B. `8:17`C. `8:19`D. `5:17`

Answer» Number of employees in HR department `=(5)/(100)xx800=40`
Number of females `40-12=28`
Ratio `=28:40rarr7:10`
660.

Pie charts show the expenses on various heads show the expenses on various heads in construction of a house Study the pie chart यदि भवन निर्माण की कुल लागत वर्ष 1991 में रू `3, 60, 000` तथा वर्ष 2001 में लागत रू `8,64,000` हो तो बताये वर्ष 1991 तथा 2001 में इस्पात पर कितने रुपये खर्च किये गए ।A. रू `2,16,00` रू `4,32,000`B. रू `60,000` रू `84,000`C. रू `80,000` रू `2,10,000`D. रू `50,000` रू `1,44,000`

Answer» Expendtiture on Steel
Year `1991=(50 ^(@))/(360^ (@))xx360000=Rs. 50000`
Year 2001 `=(864000)/(360)xx60=Rs144000`
661.

Pie charts show the expenses on various heads show the expenses on various heads in construction of a house Study the pie chart यदि एक घर के निर्माण में वर्ष 1991 में रू `360000` तथा वर्ष 2001 में कुल रू `864000` खर्च किया गया हो तो बताये वर्ष 1991 से 2001 में मजदूरी लागत में कितने `%` की बढ़ोतरी हुई ।A. `3 1/9 %`B. `43 1/3%`C. `41 2/3 %`D. `166 2/3%`

Answer» Expenditure on labourers:
Year 1991 `rArr(360000xx90^(@)/360^(@))=Rs. 90000`
Year `2001rArr(864 00 0xx100^(@))/(360 ^(@))=Rs. 240000`
Percentage increase `=(240000-90000)/(90000)xx100`
`=166(2)/(3)%`
662.

Study the pie chart and table given below and answer the questions Details of percentage of employees working in various departments in an organization and number of males among them total number of employees =800 मार्केटिंग विभाग में काम करने वाले आदमियों की संख्या मार्केटिंग विभाग में कार्यरत कुल कर्मचारियों की संख्या का कितना `%` है ।A. `84%`B. `86%`C. `88%`D. `91%`

Answer» Number of employees in marketting department
`=(24)/(100)xx800=192`
`therefore` Requried percentage `=(165)/(192)xx100=86%`
663.

The marks obtained by 273 examinees are shown by the frequency polygon Given that mean marks is `59.5` Study the frequency polygon and answer the given question कितने परीक्षार्थिओं ने औसत अंको से अधिक अंक प्राप्त किये ।A. 72B. 105C. 152D. 164

Answer» Number of examinees getting more than the average marks `=72+48+24+8=152`
664.

Study the pie chart and table given below and answer the questions Details of percentage of employees working in various departments in an organization and number of males among them total number of employees =800 IT विभाग में कार्यरत महिलाओं की संख्या कुल कर्मचारियों की संख्या का कितने `%` है ।A. `10.25%`B. `10.75%`C. `15.25%`D. `15.75%`

Answer» Number of employees in IT department
`=800xx(20)/(100)=60`
Number of females `=160-74= 86 `
`therefore` Requried percentage `=(86)/(800)xx100=10.75%`
665.

Study the pie chart and table given below and answer the questions Details of percentage of employees working in various departments in an organization and number of males among them total number of employees =800 मार्केटिंग विभाग में कार्यरत पुरुषो तथा औरतो की संख्या में अनुपात बताये ।A. `52:7`B. `52:9`C. `55:7`D. `55:9`

Answer» Total employees in marketing department=192
Males=165
Females `=192-165=27`
`therefore` Required Ratio `=165:27=55:9`
666.

Given that for a reaction of order n. the intergrated form of the rate equation is `k= (1)/(t(n-1))[(1)/(C^(n-1))-(1)/(C_(0)^(n-1))]` where `C_(0)` and C are the values after time t. What is the relationship between `t_(3//4)` and `t_(1//2)` where `t_(3//4)` is the time required for C to become `1//4C_(0)-`A. `t_(3//4) = t_(1//2)[2^(n-1) +1]`B. `t_(3//4) =t_(1//2)[2^(n-1)-1]`C. `t_(3//4) =t_(1//2) [2^(n+1) -1]`D. `t_(3//4) =t_(1//2) [2^(n+1)+1]`

Answer» Correct Answer - A
`t_(3//4)(1)/(K(n-1))[(1)/(((C_(0))/(4))^(n-1))-(1)/(C_(0)^(n-1)]]`
`= (1)/(k(n-1)) (4^(n-1)-1)C_(0)^(n-1)`
`:. t_(1//2)=(1)/(K(n-1))(2^(n-1)-1)`
`So (t_(3//4))/(t_(1//2)) =2^(n-1)+1`
667.

Find the appropriate questions for the following answersToday is the 8th of March. We won't go to school. We are celebrating our Mother's Day. We shall do our best to make our Mother happy. A) When did you celebrate it? B) Why won't you go to school today? C) Do you celebrate Father's Day too? D) What will you give to your mother? E) Will you help her about the house?

Answer»

B) Why won't you go to school today?

668.

Read the following paragraph and answer the questions that follow :Tourists to Jammu and Kashmir have another attraction-a floating post office on the Dal Lake in Srinagar, the first in the country,'Floating Post office, Dal Lake, claimed to be the only one such post office in the world, is built on an intricately carved maroon houseboat, fastened on the western edge of the Dal Lake.This post office lets you avail of all regular postal services available in the country, while being afloat. The seal used on everything posted from Floating Post office is unique; along with the date and address, it bears the design of a boatman rowing a shikara on the Dal Lake.The special feature of this post office is that the letters posted from here carry a special design which has the picturesque scenery of the Dal Lake and Srinagar city. These pictures reach wherever these letters are posted to, and thereby, promote Kashmir as a tourist destination across the world.This is actually a heritage post office that has existed since British times. It was called Nehru Park Post Office before 2011. But then the chief postmaster, John Samuel renamed it.'Floating Post Office'.The Post Office's houseboat has two small rooms-one serves as the office and the other a small museum that traces the philatelic history of the state postal department. It also houses a shop that sells postage stamps and related postal products.But for the locals, Floating Post Office is more than an object of fascination. A sum of 1-2 crore is deposited per month in Floating Post Office by the communities living in and around the Dal Lake as the lake has several isles that are home to more than 50,000 people.The greatest fear is the recurrence of the 2014-like floods in which the houseboat had gone for a toss, uncontrollably pushed by the flood. Rescue teams had to anchor it using special mechanism in a nearby highland. It was reinstated on the Dal after the water receded. The biggest boon is that at no time of the year do you need a fan in the post-office!.1. Where is the Floating Post Office located?a. In the Dal Lake.b. In Jammu.c. In Shimla.d. In Himachal.2. What is the special feature of this post office?a. It reaches its customers on demand.b. It uses a seal that bears the design of a boatman rowing a shikara on the Dal Lake.c. It charges anyone who want to have a look around it.d. It is open all days of the week.3. The heritage post office has existed since the times of :a. the Mughals.b. independence.c. the British.d. Akbar.4. The Floating Post Office is more than an object of fascination for the :a. tourists.b. guides.c. none of these.d. locals.5. The lake has several isles that are home to a population of more than :a. 50,000 people.b. 20,000 people.c. 19,999 people.d. 49,999 people.6. The biggest boon is that at no time of the year does the post office require :a. water.b. a fan.c. electricity.d. food.7. _______ renamed the post office as 'Floating Post Office'.a. Lord Canningb. Michael Faradayc. John Samueld. Mahatma Gandhi8. The greatest fear is the recurrence of the 2014-like floods in which the houseboat had gone for a toss, uncontrollably pushed by the flood.a. FALSEb. TRUE9. The heritage post office is built on an intricately carved blue houseboat, fastened on the western edge of the Dal Lake.a. FALSEb. TRUE10. The 'Floating Post Office' was called Nehru Park Post Office before 2011.a. FALSEb. TRUE

Answer»

1. a. In the Dal Lake.

2. b. It uses a seal that bears the design of a boatman rowing a shikara on the Dal Lake.

3. c. the British.

4. d. locals.

5. a. 50,000 people.

6. b. a fan.

7. c. John Samuel

8. b. TRUE

9. a. FALSE

10. b. TRUE

669.

Which organisation is responsible for estimating unemployment in India? (a) ILO(b) NSSO (c) Niti Aayog (d) None of these

Answer»

Correct answer is (b) NSSO

670.

Read the following paragraph and answer the questions that follow :Urbanisation, defined as the increase in the number of cities and urban population, is not only a demographic movement but also includes social, economic, and psychological changes that constitute the demographic movement. It is a process that leads to the growth of cities due to industrialisation and economic development. The rapid increase in urban population worldwide is one among the important global health issues of the 21st century. According to the projections of the United Nations Population Division, by 2030, more people in the developing world will live in urban than rural areas; by 2050, two-thirds of the population will likely be urban. The scenario in India is also affected by this trend. In India, approximately 28% of the population lives in cities and this is expected to increase to 41% by the year 2025.Urbanisation brings with it a unique set of advantages and disadvantages. This demographic transition is accompanied by economic growth and industrialisation, and by profound changes in social organisation and in the pattern of family life. Urbanisation affects mental health through the influence of increased stressors and factors, such as overcrowded and polluted environment, high levels of violence, and reduced social support.The movement of population to urban areas has led to large number of older men and women left to look after themselves in the rural areas, while the young generation lives in the cities for livelihood. This also leads to less availability of caregivers for old people. The impact of urbanisation is associated with an increase in mental disorders. The reason is that the movement of people to urban areas requires more facilities to be made available for them and for the infrastructure to grow. This does not happen in proportion to the increase in population. Hence, lack of adequate infrastructure increases the risk of poverty and exposure to environmental adversities. Further, this also decreases social support as nuclear families increase in number.Urbanisation is, thus, seen as a natural corollary of growth. The awareness of the impact of urbanisation on health, more so on mental health, will act as a facilitator of change in the growing Indian economy.1. Define urbanisation.a. The increase in the number of cities and urban population.b. The increase in the numbers of caregivers in urban areas.c. The decrease in economic growth and industrialisation.d. The decrease in stressors.2. Low does urbanisation affect mental health?a. Through increased social support.b. Through the influence of increased stressors and factors.c. Through increase in caregivers in rural areas.d. Through accelerated growth in infrastructure.3. Among the important global health issues of the 21st century is the rapid increase in worldwide :a. demographic movement.b. psychological changes.c. urban population.d. economic changes.4 . A unique set of advantages and disadvantages accompanies :a. industrialisation.b. demographic transition.c. polluted environment.d. urbanisation.5. Through the influence of increased stressors and factors, urbanisation affects :a. mental health.b. economic growth.c. global health.d. industrialisation.6. Besides exposure to environmental adversities, lack of adequate infrastructure increases the risk of :a. violence.b. poverty.c. mental illness.d. reduced social support.7. In India, approximately 28% of the India’s population lives in cities and this is expected to increase to______ by the year 2025.a. 50%b. 65%c. 41%d. 70%8. The movement of the young generation to the cities for livelihood has led to an increase in the caregivers for old people.a. TRUEb. FALSE9. Urbanisation is seen as a natural corollary of growth.a. TRUEb. FALSE10. Urbanisation affects physical health through the influence of increased stressors and factors, such as overcrowded and polluted environment, high levels of violence, and reduced social support.a. TRUEb. FALSE

Answer»

1. b. The increase in the numbers of caregivers in urban areas.

2. b. Through the influence of increased stressors and factors.

3. c. urban population.

4. d. urbanisation.

5. a. mental health.

6. b. poverty.

7. c. 41%

8. b. FALSE

9. a. TRUE

10. b. FALSE

671.

Read the following paragraph and answer the questions that follow : Rabindranath Tagore, more popularly known as Gurudev, was born in Kolkata on May 8, 1861 to Maharshi Debendranath and Sharda Devi. It was a time of gloom and cheerlessness, and India’s soul almost lay prostrate at the feet of the foreign rulers. Politically, India was deep in slavery, and culturally, in the wilderness. People were foolishly aping the ways of the West and there was hardly any ray of hope. Tagore, as a child, did not like to go to school and so was taught at home. He began to write from an early age. He began writing poems, songs, and stories about the different aspects of the Indian culture and society. He was very talented, energetic and wise, and whatever he touched was exceptionally enriched. His genius, like the rising sun, began to create wonders. He shed light and warmth, and revived the mental and moral spirit of the people. His writings proved path-breaking and revolutionary. He was full of anguish, pain and sorrow at the Jallianwala Bagh tragedy in which General Dyer and his soldiers had killed hundreds of innocent civilians and wounded thousands of others on April 13, 1919 in Amritsar. As a cultural ambassador of India, Rabindranath Tagore gave voice to the country and became an instrument in spreading the knowledge of Indian culture around the world. Hence, decided to renounce and relinquish his knighthood as a protest and immediately penned a letter to the then Viceroy. He wrote, "The time has come when pledges of honour make our shame glaring in their incongruous context of humiliation and I, for my part, wish to stand shorn of all special distinctions, by the side of my countrymen, who for their so-called insignificance are liable to suffer degradation not fit for human beings".1. Why was Tagore taught at home?a. Tagore did not like to go to school.b. Tagore’s parents could not afford to send him to school.c. There were no schools near Tagore’s house.d. Tagore did not like the subjects taught at school.2. What did Tagore begin to write at an early age?a. At an early age, Tagore began writing plays and stories.b. At an early age, Tagore began writing poems, songs, and stories.c. At an early age, Tagore began writing poems and plays.d. At an early age, Tagore began writing plays and songs.3. Rabindranath Tagore was popularly known as :a. Maharishi.b. Tagore.c. Gurudevd. poet.4. Rabindranath Tagore gave voice to the country in the capacity of its :a. writerb. knight.c. Viceroy.d. cultural ambassador.5. The Jallianwala Bagh tragedy took place on :a. April 13, 1919.b. March 73, 1819.c. April 70, 1977.d. May 9, 1979.6. As a protest, Tagore penned a letter to :a. General Dyer.b. the Viceroy.c. the government.d. the soldiers.7. General Dyer and his soldiers killed hundreds of innocent civilians and wounded thousands of others on April 13, 1919 ______a. Amritsarb. Surat.c. Jallianwala Bagh.d. Panipat.8. Politically, India was deep in slavery, and culturally, in the wilderness.a. FALSEb. TRUE9. Rabindranath Tagore, more popularly known as Gurudev, was born in Kolkata on March 8, 1861 to Maharshi Debendranath and Sharda Devi.a. FALSEb. TRUE10. Tagore’s writings proved path-breaking and revolutionary.a. FALSEb. TRUE

Answer»

1. a. Tagore did not like to go to school.

2. b. At an early age, Tagore began writing poems, songs, and stories.

3. c. Gurudev

4. d. cultural ambassador.

5. a. April 13, 1919.

6. b. the Viceroy.

7. c. Jallianwala Bagh.

8. b. TRUE

9. b. TRUE

10. b. TRUE

672.

Read the following paragraph and answer the questions that follow : According to Global Wage Report 2018-19, published by International Labour Organisation (ILO), women are paid most unequally in India, compared to men, when it comes to hourly wages for labour. This gap in wages, known as gender wage gap, is the highest among 73 countries, says studies based on the report. These findings are based on the data from 136 countries.On an average, women are paid 34% less than the men in India, and globally, the hourly wages of women are 16% less than those of men. The inequality is higher in the monthly wages, with a gap of 22%.Overall, real wages grew just 1.8% globally(136 countries) in 2017. Women are paid higher hourly wages than men in Bangladesh.The gender wage gap has remained unchanged at 20% from 2016 to 2017. But in 2017, the gender gap was accompanied by near-stagnation in wages. Real wage growth was lowest since 2008, the year of the financial crisis. In real terms, global wage growth declined to 1.8% in 2017, from 2.4% in 2016. In advanced economies, real wage growth declined from 0.9% in 2016 to 0.4% in 2017, meaning near stagnation. By contrast, in emerging economies and developing countries, real wage growth dipped marginally from 4.9% in 2016 and 4.3% in 2017.This global stagnation in real wages come in line with global growth forecast, which was revised lower by International Monetary Fund (IMF)earlier. The slowdown in wage at level of hourly labour wages is in contrast with organised sector salaries.The ILO is United Nations agency dealing with labour issues, particularly international labour standards, social protection, and work opportunities for all. It was established, in 1919, as an agency of the League of Nations, and is headquartered in Geneva, Switzerland. India is a founder member of the ILO. At present, it has 187 members. The principal means of action in the ILO is the setting up of international standards in the form of conventions, recommendations, and protocol.1. On what kind of change do we need to place an emphasis as far as the wages of men and women are concerned, globally?a. Equal wages.b. Real wage growthc. Slowdown in wage growth.d. Gender-wage gap.2. What is the full form of IMF?a. Indian Money Fund.b. International Monetary Fund.c. International Money Fund.d. Indian Monetary Fund.3. Women are paid higher hourly wages than men in :a. India.b. Chinac. Bangladeshd. United States.4. From 2016 to 2019, the gender wage gap has remained unchanged at :a. 10%b. 45%c. 50%d. 20%5. The ILO was established in :a. 1919b. 1999c. 1989d. 19906. The number of members that the ILO, at present has is :a. 87b. 187c. 136d. 737. The slowdown in wage at level of hourly labour wages is in contrast with_____sector salaries.a. unorganisedb. privatec. organisedd. joint8. The ILO was established in 1926.a. TRUEb. FALSE9. According to Global Wage Report 2018-19, published by International Labour Organisation (ILO), women are paid most unequally in India, compared to men.a. TRUEb. FALSE10. The ILO is headquartered at New York, US.a. TRUEb. FALSE

Answer»

1. a. Equal wages.

2. b. International Monetary Fund.

3. c. Bangladesh

4. d. 20%

5. a. 1919

6. b. 187

7. c. organised

8. b. FALSE

9. a. TRUE

10. b. FALSE

673.

In the given circuit, it is observed that the current I is independent of the value of the resistance R6. Then the resistance values must satisfy(a) R1R2R5 = R3R4R6(b) 1/R5 + 1/R6 = 1/R1 + R2 + 1/R3 + R4(c) R1R4 = R2R3(d) R1R3 = R2R4 = R5R6

Answer»

Correct Answer is: (c) R1R4 = R2R3

As I is independent of R6, no current flows through R6. This requires that the junction of R1 and R2 is at the same potential as the junction of R3 and R4. This must satisfy the condition R1/R2 = R3/R4,as in the Wheatstone bridge.

674.

A two stage rocket is fired vertically upward from rest with acceleration as shown in a-t graphs. After 15 sec, the first stage burns out and second stage ignites. Choose the INCORRECT statement regarding motion of rocket in the time interval `0letle40s`.A. at t=15 sec, the speed of rocket is 15.0m/sB. At t=20 sec, the speed of rocket is 300m/sC. In time interval t=0 sec to t=15 sec, the distance travelled by rocket is 750 m.D. in time interval t-0 sec to t=20 sec, the distance travelled by rocket is 1500 m.

Answer» Correct Answer - D
`v{{:((2t^(2))/(9)hatj,"if "0letle15sec),(150+150(5-15)+15(t-15)^(2)hatj,"if "15sletle40s):}`
at t=15
`r=(2xx15xx15xx15)/(3xx3)=750m`
675.

A particle whose velocity is given as `vecv=hati+6thatjm//s` is moving in x-y plane. At t-0, particle is at origin. Find the radius of curvature of path at point `((sqrt(2))/(3)m,(2)/(3)m)`A. 1.5 mB. 3.0 mC. 4.5 mD. 6.0 m

Answer» Correct Answer - C
`v_(x)=1impliesx=t` and `v_(y)=6timpliesy=3t^(2)impliesy=3x^(2)`
`implies(dy)/(dx)=6x,(d^(2)y)/(dx^(2))=6implies|(dy)/(dx)|_(x)=(sqrt(2))/(3)=2sqrt(2)`
As we know that
`R=([1+((dy)/(dx))^(2)]^(3//2))/((d^(2)y)/(dx^(2)))=((1+8)^(3//2))/(6)=4.5m`
676.

Which of the following sets cannot enter into the list of fundamental quantities in any system of units ?(a) length, mass and velocity,(b) length, time and velocity,(c) mass, time and velocity,(d) length, time and mass.

Answer»

(b) length, time and velocity,

677.

A ball is released from the top at a tower of height h meters. It takes T seconds to reach the ground. What is the position of the ball at T1/3 second. (1) 17h/18 meters from the ground(2) 17h/9 meters from the ground (3) 8h/9 meters from the ground (4) h/9 meters from the ground

Answer»

Answer is (3) 8h/9 meters from the ground

h = (1/2) gT2. and h’ = (1/2) g(T/2)2

h/h’ = 9 or h’ = h/9

Distance from ground = h - h’ = h - (h/9) = 8h/9 

678.

If (3a-b)×(a+3b)=ka×b,then what is the value of k?

Answer»

(3a - b) x (a + 3b) = kaxb

= (3a.3b) - (ab)

= 8ab

679.

If volume of a regular tetrahedron of edge length k is V and shortest distance between any pair of opposite edges of same regular tetrahedron is d, then find the value of `d^3/V.`

Answer» Volume of tetrahedron` = k^3/(6sqrt2)`
k=edge length= `sqrt2*d`
`V= (d*sqrt2)^3/(sqrt2*6)`
Hence,`d^3/V= 3`
680.

What are the causes of fault occurrence is vacuum cleaner?

Answer»

I. The vacuum cleaner brush does not spin due to problems related with the belts that are used in the construction of the appliance 

II. A cleaner belt may break when solid dirt particles such as lint, string, or hair are trapped. 

III. vacuum cleaner noises tend to emanate from the location of the drive motor. This is caused when dirt enters the motor area and causes blockages. 

IV. If your vacuum cleaner appears to be dead, it could indicate that there is a problem with the mains flex.

681.

Mention the disadvantages of connecting electrical appliances in series in domestic wiring.

Answer»

1. In series combination, if any of the components fail to work, the circuit will break and then none of the components will work.

2. It is not possible to connect a bulk and a heater in series because they need different valves of current to operate properly.

682.

Which of the following methods of manufacturing is used for the production of appliances like the fridge and vacuum cleaner?(a) Forging(b) Deep drawing(c) Sheet metal forming and cutting(d) Rolling

Answer» Correct answer is (c) Sheet metal forming and cutting

Easiest explanation: Sheet metal forming and cutting processes are widely used for the manufacturing of home appliances like fridge, vacuum cleaner radio, toys, dryers etc. In the sheet metal forming processes, bending operation is takes place which form the metal and sheet cutting is used for shearing out the metal part from the large metal sheet.
683.

Find the voltage across the 6 ohm resistor.(a) 150V(b) 181.6V(c) 27.27V(d) 54.48V

Answer» Correct answer is (c) 27.27V

To explain: Total current I=150/(6+12+15)=(150/33)V.

V across 6 ohm = 6*I = 6*(150/33)V = 27.27V.
684.

A bulb has a power of 200W. What is the energy dissipated by it in 5 minutes?(a) 60J(b) 1000J(c) 60kJ(d) 1kJ

Answer» Right answer is (c) 60kJ

For explanation: Here, Power = 200w and time = 5min. E=Pt => E= 200*5= 1000Wmin=60000Ws= 60000J= 60kJ.
685.

Calculate the power across each 20 ohm resistance.(a) 1000W, 1000W(b) 500W, 500W(c) 1000kW, 1000kW(d) 500kW, 500kW

Answer» Correct choice is (b) 500W, 500W

The explanation is: This is a series connected circuit hence the current across each resistance is the same. To find current: I=V/R=200/20=5A.

To find power: P=I^2R=5^2*20=500W. Since both the resistors have a resistance of 20 ohms, the power across both is the same.
686.

A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.(a) 72Wh(b) 72kJ(c) 7200J(d) 72kJh

Answer» Correct choice is (b) 72kJ

Explanation: Here I (current) = 2A and Resistance(R) = 10ohm. Power = I^2R = 2^2*10=40. Energy = Pt = 40*0.5*60*60 = 72000J=72kJ.
687.

Calculate the energy dissipated by the circuit in 50 seconds.(a) 50kJ(b) 50J(c) 100j(d) 100kJ

Answer» Correct choice is (a) 50kJ

The best I can explain: Here V = 100 and R = 10. Power in the circuit= V^2/R = 100^2/10 = 1000W.

Energy= Pt= 1000*50 = 50000J = 50kJ.
688.

Calculate the work done in a resistor of 20 ohm carrying 5A of current in 3 hours.(a) 1.5J(b) 15J(c) 1.5kWh(d) 15kWh

Answer» Right choice is (c) 1.5kWh

Explanation: To find power: P=I^2R=5^2*20=500W=0.5kW.

To find Work done: W=Pt=0.5*3=1.5kWh.
689.

In a parallel circuit, with a number of resistors, the voltage across each resistor is ________(a) The same for all resistors(b) Is divided equally among all resistors(c) Is divided proportionally across all resistors(d) Is zero for all resistors

Answer» The correct choice is (a) The same for all resistors

Easy explanation: In parallel circuits, the current across the circuits vary whereas the voltage remains the same.
690.

A current of 5A flows in a resistor of 2 ohms. Calculate the energy dissipated in 300 seconds in the resistor.(a) 15kJ(b) 15000kJ(c) 1500J(d) 15J

Answer» Right option is (a) 15kJ

For explanation I would say: P=I^2R =5^2*2=50W.

E= Pt=50*300=15000J=15kJ.
691.

Kilowatt-hour(kWh) is a unit of?(a) Current(b) Power(c) Energy(d) Resistance

Answer» Correct choice is (c) Energy

Easiest explanation: Power is the energy per unit time. That is, P=E/t. If the unit of power in kW and the unit of time is an hour, then the unit of energy=unit of power*unit of time=kWh.
692.

What is meant loading and unloading of phloem?

Answer»

The entering of sugar into sieve tube is called loading and movement of sugar out of sieve tube into storage tissues is called unloading.

693.

The vapour pressure of pure benzene is 640 mm of Hg. 2.175 x 10-3 kg of non-volatile solute is added to 39 g of benzene, the vapour pressure of solution is 600 mm of Hg. Calculate molar mass of solute (C = 12, H = 1).

Answer»

Given: 

Vapour pressure of pure benzene (\(p^o_1\))= 640 mm Hg 

Mass of solute (W2) = 2.175 x 10-3 kg 

Mass of solvent (W1) = 39 g = 39 x 10-3 kg 

Vapour pressure of solution (p) = 600 mm Hg 

To find: Molar mass of solute (M2

Formula: 

\(\frac{p^o_1 - p}{p^o_1}=\frac{W_2}{W1}\times\frac{M_1}{M_2}\) 

Calculation: Molar mass of solvent (benzene) (M1) = 78 x 10-3 kg mol-1

From formula,

\(\frac{640-640}{640}=\frac{2.175\times10^{-3}}{39\times10^{-3}}\times\frac{78\times10^{-3}}{M_2}\)

M2 = \(\frac{640\times2.175\times10^{-3}\times78\times^{-3}}{39\times10^{-3}\times40}\) = 69.6 x 10-3 kg/mol = 69.6 g/mol

694.

If ‘a’ is the aperture of telescope and ‘λ’ is the wavelength of light then resolving power of telescope is ______.(A) \(\frac{λ}{1.22a}\)(B) \(\frac{1.22a}{λ}\)(C) \(\frac{1.22λ}{a}\)(D) \(\frac{a}{1.22λ}\)

Answer»

Answer is:

(D) \(\frac{a}{1.22λ}\)

695.

Find the odd one and give a reason,(a) Dual aspect(b) Historical cost(c) Accounting period(d) Verifiability and objectivity.

Answer»

(c) Accounting period, it is ah accounting assumption, But all others are accounting principles.

696.

A statement prepared from the historical data showing inflows and outflows of cash is called _______. A. Profit and loss account B. Memorandum Balance sheet C. Cash flow statement D. Fund Flow statement

Answer»

C. Cash flow statement 

697.

“The nature of problems faced by Indian agriculture varies according to agro-ecological and historical experiences of its different regions.” Describe any five problems associated with Indian agriculture to prove the statement.

Answer»

Problems of Indian agriculture-

1. Dependence on Erratic Monsoon 

2.Low productivity 

3.Constraints of Financial Resources and Indebtedness 

4. Lack of Land Reforms 

5. Small Farm Size and Fragmentation of Landholdings 

6.Lack of Commercialisation

698.

A and B were partners in a firm sharing profits in 3:2 ratio. They admitted C for `3//7` share which he took `2//7` from A and `1//7` from B. Calculate new profit sharing ratio?

Answer» Correct Answer - `11:9:15`
699.

A and B are partners of partnership firm sharing profits in the ratio of 3:2 respectively. C was admitted for 1/5th share of profit. Machinery would be appreciated by 10% (book value Rs.80,000) and building would be depreciate by 20%( Rs.2,00,000). Unrecorded debtors of Rs.1,250 would be brought into books now and a creditor amounting to Rs.2,750 died and need not part anything on this account. What will be profit/loss on revaluation?(A)Loss Rs.28,000 (B) Loss Rs.40,000( C) Profits Rs.28,000 (D) Profits Rs.40,000

Answer»

Correct option is (A)Loss Rs.28,000

700.

Sacrificing ratio use to distribute –---------- in case of admission of a partner (A)Reserves (B) Goodwill (c ) Revaluation profit (D) Balance in profit and loss account

Answer»

Correct option is (B) Goodwill