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4351.

Which of the following dynasty ruled the Jejakabhukti region of central India?1. Parmar Dynasty2. Kalchuri Chedi ​Dynasty3. Chandela Dynasty4. Mughal Dynasty

Answer» Correct Answer - Option 3 : Chandela Dynasty

The correct answer is ​Chandela Dynasty

  • The Chandela dynasty ruled the Jejakabhukti region (Bundelkhand in present-day Madhya Pradesh and Uttar Pradesh).
    • Chandela Dynasty was established by "Nannuk" in 831 AD and its capital was Khajuraho.
    • The Chandela ruler Vidyadhar (1017-1029 AD) built the famous "Kandariya Mahadev Temple".
  • Vidyadhar protected the state from 'Mahmud Ghaznavi'.
  • Yashovarman built the famous 'Vishnu temple' of Khajuraho. 
  • The last ruler of the Chandela dynasty was 'Parmardidev', whose commander was 'Alha-udal'.
  • The entire region of present-day Madhya Pradesh came under the Mughal Empire during the period 1156–1605 AD.
4352.

Why a service cannot be seen, touched, held or put on a shelf? A) Omnipresent B) No physical shape C) Not accessible

Answer»

B) No physical shape

No physical shape cannot be seen, touched, held or put on a shelf.

4353.

Identify the correct option for the acronym ‘PPP’. A) Purchasing Power Parity B) Purchasing Power Pair C) Purchase Power Pair D) Purchase Power Parity

Answer»

A) Purchasing Power Parity

The correct option for the acronym ‘PPP’ is Purchasing Power Parity.

4354.

Consider the following statements about Vijaydan Detha:(A) Vijayadan Detha was a famous writer of Rajasthan, whose story was adapted as Charandas Chor play.(B) Vijayadan Detha was a co-founder of Rupayan Sansthan.Choose the correct answer from the code below:1. Only (A) is true.2. Only (B) is true.3. Neither (A) nor (B) is true.4. Both (A) & (B) are true.

Answer» Correct Answer - Option 4 : Both (A) & (B) are true.

The correct answer is Both (A) & (B) are true.

  • Vijayadan Detha was a famous writer of Rajasthan, whose story was adapted as Charandas Chor play.
  • Vijaydan Detha was a co-founder of Rupayan Sansthan.

  • Vijayadan Detha 
    • ​Vijaydan Detha also known as Bijji, was a noted Indian writer of Rajasthani literature.
    • He was a recipient of several awards including the Padma Shri and the Sahitya Akademi Award.

  • Many of his stories and novels have been adapted for the stage and the screen like:
    • Mani Kaul's Duvidha (1973)
    • Habib Tanvir and Shyam Benegal's Charandas Chor (1975)
    • Prakash Jha's Parinati (1986)
    • Amol Palekar's Paheli (2005)
    • Pushpendra Singh's The Honour Keeper (2014)
    • Dedipya Joshii's Kaanchli Life in a Slough (2020).
  • With Komal Kothari, he founded Rupayan Sansthan, an institute that documents Rajasthani folklore, art, and music.
  • His literary works include Bataan ri Phulwari (Garden of Tales), collection of stories that draw on folklore in the spoken dialects of Rajasthan. 
4355.

Parmar Dynasty ruled which parts of Rajasthan?1. Jalore2. Vagad3. Abu, Sirohi4. All of the above

Answer» Correct Answer - Option 4 : All of the above

The correct answer is All of the above.

  • The Paramaras had different branches,
    • Parmar of Abu
    • Parmar of Marwar
    • Parmar of Sindh
    • Parmar of Gujarat
    • Parmar of Bagh
    • Parmar of Malwa
    • Parmar of Jalore
    • Parmar of Vagad
  • However the most prominent have been the Parmar of Abu and Parmar of Malwa

  • The word 'Parmar' means 'one who kills the enemy'.
  • According to Prithviraj Raso of Chandrabardai, the origin of the word Parmar is from the fire.
  • In Udaipur Prasasti, Pingal Sutravruti, Tejpal inscription, Parmaro has been described as Brahman Kshatrakulin
4356.

Which of the following is called "Radha of Rajasthan"? 1. Gavri Bai2. Saman Bai3. Mirabai4. Karmathi Bai

Answer» Correct Answer - Option 3 : Mirabai

The correct answer is Mirabai

  • Meerabai is called "Radha of Rajasthan" and her guru's name was Raidas.
  • Meerabai was born in 1498 in Kurki village in Pali, Rajasthan.
  • Meerabai is known for her devotion to Krishna. "Meera Padaavali" is her major work.
  • Mirabai established the "Dasi Sampradaya".
  • The father's name of Meerabai was Ratan Singh Rathore.
  • Mahatma Gandhi called Mirabai "the first Satyagrahi woman".
  • Gavari Bai was born in the princely state of Jodhpur in 1920 and is known as "Meera of Bangar".
  • Samanbai was a resident of Mahund village in Alwar and was the daughter of devotee Ramnath.
  • She composed the free verse of Radha and Krishna.
  • "Karmathi Bai" was the daughter of Katharia Purushottam of Purohitpur in the Bangad region.
  • She was a contemporary of Akbar and spent most of her time in Vrindavan.
4357.

Dheeraj wants to start a business of selling N-95 masks after the outbreak of the global pandemic of COVID-19. Due to the uncertain market conditions he wants to make a low investment in fixed capital. Suggest how the decisions related to the choice of technique and financing alternatives can help Dheeraj in ensuring a low investment in fixed capital requirements.

Answer»

Choice of Technique: As he wishes to stick to a low investment model, we may suggest him to go with the labour-intensive approach to manufacture N95 masks. Since better technology would cost him much and his risk appetite is not conducive for capital intensive techniques of production.

Financial Alternatives: As he wishes to stick to a low investment model, we may suggest him to go with the lease option for fixed assets like building, heavy machinery etc. as this may reduce his investments requirement in the business.

4358.

During COVID-19 pandemic situation, worldwide prices of sanitizer, masks & PPE kits are regulated by the Government policies. Identify the factor discussed in the statement. A) Promotional Programs B) Internal factors C) External Factors D) Market conditions

Answer»

C) External Factors

During COVID-19 pandemic situation, worldwide prices of sanitizer, masks & PPE kits are regulated by the Government policies. External Factors discussed in the statement.

4359.

Ramesh starts his day by reading all newspapers and has a keen interest towards all business news and articles. He connects the articles with the observations he has made over the years which he knows will eventually lead to business-boosting insights. Identify the way of trend spotting at this level. a. Read Trend b. Think trend c. Watch trend d. Talk trend

Answer»

b. Think trend

4360.

Match the following irrigation projects and select your answer using the code given below:ProjectsDistrictA) Bankli Dami) PratapgarhB)Som - Kamla - Ambaii)Sawai MadhopurC)Morel Damiii)JaloreD)Jakham Damiv)Dungarpur1. A-i, B-iv, C-iii, D-ii2. A-iii, B-iv, C-ii, D-i3. A-iii, B-ii, C-i, D-iv4. A-iv, B-i, C-ii, D-iii

Answer» Correct Answer - Option 2 : A-iii, B-iv, C-ii, D-i

The Correct Answer is A-iii, B-iv, C-ii, D-i.

 

  • Bankli Dam is located on the river Sukri in Jalore District of Rajasthan.
  • Sukri river flows from the western slopes of Aravalli Range before merging with the Majal in Luni river
  • Som - Kamla - Amba is located in the Dungarpur district.
  • The Morel dam is situated near Kankariya village in Sawai Madhopur district of Rajasthan.
  • Jakham Dam is a dam located in Pratapgarh District in Rajasthan.

 

  • Rajasthan has 7 major reservoirs and 41 rivers.
  • The rivers of Rajasthan can be divided into three main types based on their drainage pattern, they are:
    • Rivers that drain into the Arabian sea
    • Rivers that drain into the Bay of Bengal
    • Rivers with inland drainage.
4361.

The Adichanallur archaeological site is located in the state of ______.1. Karnataka2. Tamil Nadu3. Andhra Pradesh4. Kerala

Answer» Correct Answer - Option 2 : Tamil Nadu

The correct answer is Tamil Nadu.

  • The Adichanallur archaeological site is located in the state of Tamil Nadu.
    • Adichanallur is an archaeological site in the Thoothukudi district in Tamil Nadu.
  • India has been the site of a number of very important archaeological finds.
  • Korkai, the capital of the Early Pandyan Kingdom, is located about 15 km from Adichanallur.

  • The history of India begins with the birth of the Indus Valley Civilization (IVC), also known as the Harappan Civilization.
  • It flourished around 2,500 BC, in the western part of South Asia, in contemporary Pakistan and Western India.
  • The Indus Valley was home to the largest of the four ancient urban civilizations of Egypt, Mesopotamia, India, and China.
  • In the 1920s, the Archaeological Department of India carried out excavations in the Indus valley wherein the ruins of the two old cities, viz. Mohenjodaro and Harappa were unearthed.
  • In 1924, John Marshall, Director-General of the ASI, announced the discovery of a new civilization in the Indus valley to the world. 
4362.

Apollodotus coin was obtained from which of the following archaeological site in Rajasthan?1. Raid 2. Ganeshwar3. Bagor4. Bhinmal

Answer» Correct Answer - Option 1 : Raid 

The correct answer is Raid.

  • Raid Civilisation:
    • It is located in the Tonk district of Rajasthan along the bank of the Dheel river.
    • It was excavated in 1938-40 under the guidance of archaeologist KN Puri.
    • The largest hump of coins of Asia was found from excavations, including a coin related to Apollodotus.

  • Bhinmal:
    • Bhinmal civilization was located in the Jalore district.
    • Huen Shang has visited this ancient city.
    • It was explored by Ratna Chandra Agrawal in 1953-54 A.D.
  • Ganeshwar:
    • Ganeshwar is located near the copper mines of the Sikar-Jhunjhunu area of the Khetri copper belt in Rajasthan.
    • With its microliths and other stone tools, Ganeshwar culture can be ascribed to the pre-Harappan period.
    • It is supposed that Ganeshwar used to supply copper objects to Harappa.
  • Bagor:
    • ​This site was explored by V.N. Mishra in 1967.
    • The archaeological site of Bagor is a Late Mesolithic (pre-Harappa) archaeological site.
    • It is located on the Kothari river in the Bhilwara District of the Rajasthan.
4363.

Moon Pharma Ltd. manufactures face masks and face shield, amidst the COVID 19 pandemic. The total fixed cost of entire operations is Rs. 1,40,000.Face mask (Per pcs)Face shield (per pcs)Selling price per box (in Rs.)3050Variable cost per box(in Rs.)2030Sales Mix %6040The Break-even quantity for face masks will be ........ a. 4,000 pieces b. 6,000 pieces c. 10,000 pieces d. 1,00,000 pieces

Answer»

b. 6,000 pieces

4364.

Assertion (A) : Needs and problems exists in the environment Reason (R) : Opportunity is spotted by analysing the environment. a. A is true but R is false. b. Both A and R are true, but R is not the correct explanation of A c. A is true and R is the correct explanation of A d. Both A and R are false.

Answer»

b. Both A and R are true, but R is not the correct explanation of A

4365.

The major differences between European and Africanized honey bees are: a. Physical (size) b. Behavior (agressiveness) c. Ecological (habitat) d. All of these

Answer»

d. All of these

4366.

Consider the following statements about Jalipa - Kapurdi thermal power project of Rajasthan?I. This power project is lignite based.II. It has been installed by a private developer.Which of the above statement is/are correct?1. Both I and II are correct.2. Both I and II are not correct.3. Only statement I is correct.4. Only statement II is correct.

Answer» Correct Answer - Option 1 : Both I and II are correct.

The correct answer is Both I and II are correct.

  • JSW Barmer (Jalipa Kapurdi) power station is a coal-based thermal power plant located in Bhadresh village in Barmer district Rajasthan.
  • The power plant is operated by JSW Energy Limited.
  • The coal for the plant is sourced from Kapurdi and Jalipa mines.
  • Water for the power plant is sourced from Indira Gandhi Canal by constructing a 185 km pipeline.

  • The Thermal power plant of Rajasthan:
    • Suratgarh Super Thermal Power Plant
    • Kota Super Thermal Power Plant
    • Chhabra Thermal Power Plant
    • Kalisindh Thermal Power station
    • Giral Lignite Power Plant
    • Barsingsar Thermal Power station
    • Kawai Thermal Power station
4367.

In which state is the archaeological site of Surkotada situated?1. Karnataka2. Haryana3. Rajasthan4. Gujarat

Answer» Correct Answer - Option 4 : Gujarat

The correct answer is Gujarat.

  • The site at Surkotada is located 160 km (99 mi) north-east of Bhuj, in the district of Kutch, Gujarat.
    • The ancient mound stands surrounded by an undulating rising ground clustered by small sandstone hills.

  •  Surkotada is a small, 3.5-acre site northeast of Bhuj, in Gujarat. Approx 30 km from Rapar.
    • It was discovered and excavated by Shri Jagat Pati Joshi of ASI in 1964-1968.
    • The Harappans came to Surkotadaaround 2300 B.C. and built a fortified citadel and residential annex, made of mud brick, mud lumps, and rubble, containing houses with bathrooms and drains.
    • A new element in the population along with the already extant Harappa is seen in c. 1900 B.C. 
4368.

The scope of the company form of organisation is determined by 1. The Companies Act 2013 2. Memorandum of Association 3. Articles of Association a. Only 1 b. Both 1,2 c. Only 2 d. All 1,2,3

Answer»

Answer is d. All 1,2,3

4369.

Which of the following examples is not a part of the social environmental factor? a. At the time of Holi, a large number of manufacturing firms get involved in making colours which are used in the celebration of this colourful festival. b. A particular channel refrains from showing the advertisement of a particular product as it is banned by the government. c. The sale of sarees increases in the months of the year when a large number of marriages take place in India. The saree manufacturing companies make special plans of sale for these months. d. a & c only

Answer»

b. A particular channel refrains from showing the advertisement of a particular product as it is banned by the government.

4370.

The central nervous system of an insect controls the: a. Mandibles and maxillae b. Legs and wings c. Heart and foregut d. None of these

Answer»

d. None of these

4371.

Which structure is not part of the central nervous system? a. Frontal ganglion b. Circumesophageal commissure c. Tritocerebrum d. Subesophageal ganglion 

Answer»

b. Circumesophageal commissure

4372.

 The nervous system of insect is derived from a. Ectoderm b. Mesoderm c. Endoderm & mesoderm d. Endoderm

Answer»

The nervous system of insect is derived from Ectoderm.

4373.

In insect ganglion is a part of a. Nervous system b. Respiratory System c. Reproductive System d. Muscular system

Answer»

In insect ganglion is a part of Nervous system.

4374.

Visceral (stomodaeal) Nervous System: a. Frontal ganglion b. Hypocerebral ganglionc. Recurrent nerve d. Subesophageal ganglion

Answer»

c. Recurrent nerve 

4375.

In which state is the Ananthagiri Hills located?1. Kerala2. Andhra Pradesh3. Telangana4. Karnataka

Answer» Correct Answer - Option 3 : Telangana

The correct answer is Telangana.

  • Ananthagiri Hills is located in Vikarabad district, Telangana, India. The water flows from these hills to Hussain Sagar and Himayathsagar.

  •  Ananthagiri hills are 5 km from Vikarabad city of Rangareddy.
    • It is one of the dense forests in Telangana. Ananthagiri Temple is located in this forested area.
    • It is the source of the Musi River, which flows through Hyderabad.
    • It is one of the earliest habitat areas. Ancient caves, medieval fort structures, and temples show the antiquity of this area.
4376.

A motor company Ltd. Has observed that a 90° learning effect applies to all labour related costs whenever a new product is taken up for production the anticipated production to 320 units. For the coming year. The at Rs. 15/hour. Calculate the total labour hours and labour cost to manufacture 320 units.

Answer»

10 units = 1 lot

Units producedTotal output in unitsCumulative average time per unit in hrsTotal hours
1110001000
129001800
248103240
487295832
816656.110,497.68
1632590.4918,895.68

∴ Total hours = 18,895.68 

Total labour cost = 18,956.68 × 15 = Rs. 2,83,435.20

4377.

Which statement is NOT correct about the company form of business organisation? a. Company form of business organisation can be incorporated with a minimum of two members. b. Company has an access to huge capital resources c. Company is a legal person d. Company has a separate legal entity.

Answer»

a. Company form of business organisation can be incorporated with a minimum of two members.

4378.

Which form of business organisation can commence business immediately after incorporation? a. Public company b. Private company c. Partnership d. Sole proprietorship

Answer»

b. Private company

4379.

The neuron that conduct signals away from the central nervous system is known as a. Afferent neurons b. Efferent neurons c. Internuncial neuron 

Answer»

b. Efferent neurons

4380.

Which of the following feature applies ONLY to a public company?a. Can Start business after incorporation b. Has a restriction up to 200 members c. Can invite public to subscribe for its shares d. Directors are not required to obtain qualification shares.

Answer»

c. Can invite public to subscribe for its shares

4381.

What can serve as a basis for formulation of strategies and policies? a. Identifying needs b. Identifying problems c. Identifying strengths and weakness d. Identifying threats and opportunities

Answer»

d. Identifying threats and opportunities

4382.

Muga silk is the product of the silkworm, endemic to which state?1. Tamil Nadu2. Rajasthan3. Uttar Pradesh4. Assam

Answer» Correct Answer - Option 4 : Assam

The correct answer is Assam.

  • Muga culture is endemic to Assam and is the largest producer of Muga silk in the world.
  • Muga Silk has a GI tag as well.
  • Assam produces all 4 varieties of silk, yet major emphases have been given in the production of Muga and Eri Silk.
  • Assam Contributes 95% and 65% of the country’s total Muga and Eri production respectively.
  • Assam is also famous for tea and a great resource of minerals and oil.

  • Tamil Nadu is well known for its traditional silk sarees and dhotis weaved on handlooms.
  • Rajasthan - Sanganeri Hand-Block Printing has got GI tag.
  • Uttar Pradesh - Banaras Brocades and Saris have got GI tag.
4383.

Antennal sensilla is an example a. Machanoreceptors b. Chemoreceptors c. Photoreceptors

Answer»

a. Mechanoreceptors

4384.

Sara had established a homemade papad business in Pune. Papads made by her were very popular in her locality but being the sole owner and manager of business, she could neither introduce many flavours because of limited financial resources. Which of the following characteristic of her business, does this situation imply? a. Individual management and control b. Easy formation and closure c. Limited area of operation d. Unlimited liability

Answer»

c. Limited area of operation

4385.

Which of the following does a newly born need with breast milk ?(a) Honey (b) Glucose(c) Water (d) None of these

Answer»

Water does a newly born need with breast milk. 

4386.

The Rohtas Fort is located in present day ______.1. Nepal2. Bangladesh3. Pakistan4. India

Answer» Correct Answer - Option 3 : Pakistan

The correct answer is Pakistan.

  • The Rohtas Fort is located in present-day Pakistan. 
    • Rohtas Fort is a 16th-century fortress located near the city of Jehlum in the Pakistani province of Punjab.
    • The fortress was built by Raja Todar Mal on the orders of Sher Shah Suri.
    • Sher Sha Suri, the founder of the Suri dynasty, commenced the construction of Rohtas Fort in 1541.
    •  Rohtas Fort was inscribed by UNESCO as a World Heritage Site in 1997 for being an "exceptional example of the Muslim military architecture of Central and South Asia.
    • The Rohtas Fort has the following 12 gates.
    • The fort was also designed to suppress the local Gakhar tribes of the Potohar region.

  • Agra Fort
    • Near the gardens of Taj Mahal stands the important 16th-century Mughal monument known as the Red Fort of Agra.
    • This powerful fortress of red sandstone encompasses within its 2.5-km-long enclosure walls, the imperial city of the Mughal rulers.
    • The forbidding exteriors of this fort hide an inner paradise.
  • Red Fort
    • Red fort fuses architectural styles of the Timurids and the Persians.
    • Red Fort has many structures that serve as fine examples of Islamic architectural style and Mughal architecture,
    • Built By: Shah Jahan
    • Architect: Ustad Ahmad Lahauri
    • Architectural styles: Mughal, Indo-Islamic
    • Current Status: UNESCO World Heritage Site On the Banks of River Yamuna,
    • The Red Fort is known for its gardens and a water channel called The Stream of Paradise.
4387.

The maximum tolerances including side wear are permitted for Meter Gauge at curves up to 6° is:1. 4 mm tight to 8 mm slack2. 3 mm tight to 15 mm slack3. 5 mm tight to 10 mm slack4. 2 mm tight to 4 mm slack

Answer» Correct Answer - Option 2 : 3 mm tight to 15 mm slack

Concept:

Track Tolerances:

The safety and comfort of travel depend primarily on track geometry and the standard at which it is maintained. In practice, it is not possible to obtain a flawless and perfect track; the parameters governing track geometry always show certain variations due to various reasons. Track tolerances may be defined as the limits of the variability of various parameters pertaining to track geometry.

Tolerances are generally laid down for the following track parameters:

  • Gauge variation
  • Unevenness 
  • Cross-level difference 
  • Twist

Meter Gauge

Tolerance

On straight                   

3 to 6 mm

On a curve with a radius of 290m or more  

3 to 15 mm

On curve radius less than 290m  

Up to 20 mm

4388.

Which of the following alignments is normally NOT used in mountain regions.1. Switch-back alignment2. Spiral alignment3. Zigzag alignment4. Horizontal plane alignment

Answer» Correct Answer - Option 4 : Horizontal plane alignment

Concept:

There are various methods of railway alignment in mountain regions as discussed below:

Switch-back alignment:

  • In the case of steep side slopes, a considerable gain in elevation is accomplished with the switch-back method of alignment.
  • This method involves a reversal of direction achieved by the switch point.
  • The switch point is normally located in the station yard.


Spiral alignment:

  • This method is used in a narrow valley where a small bridge or viaduct has been constructed at considerable height to span the valley.
  • In this case, normally a complete loop of the railway line is constructed so that the line crosses the same point again at height through a flyover or tunnel.


Zigzag alignment:

  • In this method, the railway line traverses in a zigzag alignment and follows a convenient side slope which is at nearly right angles to the general direction of alignment.
  • The line then turns about 180° in a horseshoe pattern to gain height.


Adaption of straight alignment for mountain regions is less preferred because it will lead to a very steep track. This will be difficult for traveling and construction. Thus for easy attainment of heights spiral, zigzag or switch-back alignments are followed.

4389.

Which consideration is NOT included in the preparation of wiring?1. Type of conductor2. Wiring manufacturer3. Specifications of the wire4. Colour code mentioned

Answer» Correct Answer - Option 1 : Type of conductor
  • Type of conductor is NOT included in the preparation of wiring because in wiring we generally used different types of the cable according to the current rating.
  • Type of conductor consideration is mainly used for distribution and transmission cable according to distance, tensile strength as well as current rating such as ACSR, AAC, Cadmium copper, etc.

The main consideration for the preparation of Wiring:

1. Wiring manufacturer company: We have to use the different kinds of manufacturer wire according to the market analysis as well as estimation.

2. Specifications of the wire: We have to select the different SWG of the cable according to power ratings such as light-subcircuit load or power circuit load.

3. Colour code: We have to use different color codes to distinguish the Phase, Earth, or Neutral wire.

4. Types of Cable: Different types of cable used such as PVC, Lead-sheath, CTC-TRS, etc according to the application.

4390.

Which of the following steps is not included in preventive maintenance of electrical machine?1. Planning2. Measurement3. Evaluation4. Testing

Answer» Correct Answer - Option 2 : Measurement

To apply the preventive maintenance plan we have to do the following:

  • Study the production line of planning and plant area environment and the theory of the machine
  • Divided the machines into many branches like gearboxes, bearing, hydraulic, pneumatic and etc...
  • Start evaluation of the lubrication plan for all parts.
  • Start establishing the daily, weekly, monthly and etc. maintenance tasks plans for the maintenance team and production teams for each machine
  • Start establishing the daily testing (it a very important )
  • Start to implement the system and collect the result to make the fine-tuning of this scandal according to the feedback from the downtime report.
  • All of these steps depend on the recommendations of the machine's fabricators and your experience.
4391.

Consider a silver target in coolidge tube to produce x-rays. The accelerating potential is 31 kV. `E_(K)=25.51 KeV, E_(L)=3.5 1 KeV. "If" lambda_(K alpha)-lambda_("min")` is approximately8N pm(in pm), where N is an integer find N. Round off to nearest integer. (Take : hc = 1240 e V nm)

Answer» Correct Answer - `0002`
`lambda_("min")=(1240)/(31xx10^(3))=40xx10^(-2) nm = 4xx10^(-11)m=40 `pm
`E_(k)-E_(L)=(hc)/(lambda_(k alpha))=25.51-3.5`
`lambda_(k alpha)=(1240)/(22)xx10^(-3)=56.36` pm `=16.36 ~=16`pm
4392.

How do water droplets form on the outer surface of a bottle containing cold water?1. The water vapour present in the bottle condenses and penetrates outside2. The water vapour present in the air condenses on the surface of the bottle.3. The water inside the bottle evaporates and appear as water droplets.4. The water vapour present in air evaporates and sticks on the surface of the bottle.

Answer» Correct Answer - Option 2 : The water vapour present in the air condenses on the surface of the bottle.

The correct answer is The water vapour present in the air condenses on the surface of the bottle.

  • Moisture in the air called "humidity".
  • The amount of moisture that can be in the air depends on the temperature of the air.
  • The warmer the air is, the more water it can hold in it.
  • When the air comes up against the cold outside of a cold bottle, the air right next to the bottle gets cold.
  • It gets so cold that it can't hold as much water anymore and some of the water "condenses" or comes out of the air onto the bottle.
  • That cold air next to the bottle is heavier than the air around it (hot air rises, cold air sinks) so the colder air with some water out of it sinks, and fresh water-filled air comes in to get cooled and leave some more condensation.
  • This process is similar to what causes clouds to form and rain to fall. Moisture in the air is condensed and precipitated because of cooler temperature or similar effect.
  • The formation of dew is almost exactly like the formation of the water droplets on the outside of a cold bottle.
4393.

In a nuclear reactor, a coolant is used to:1. Cool the hot steam and condense it to water2. Cool generator coils and prevent overheating3. Make steam to run turbines4. Transfer heat from reactor to water in heat exchanger

Answer» Correct Answer - Option 4 : Transfer heat from reactor to water in heat exchanger

The correct answer is to Transfer heat from the reactor to water in a heat exchanger.

  • A nuclear reactor coolant is a coolant in a nuclear reactor used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment.
  • Frequently, a chain of two coolant loops are used because the primary coolant loop takes on short-term radioactivity from the reactor.
4394.

In the final answer of the expression `((29.2-20.2)(1.79xx10^(5)))/1.37`. The number of significant figures isA. 1B. 2C. 3D. 4

Answer» Correct Answer - C
On calculation we find
`((29.2-20.2)(1.79xx10^(5)))/(1.37)=17xx10^(6)`
As the least precise number contains 3 significant figures , therefore answer should also contains 3 significant figures.
4395.

The time period of revolution in the `3^(rd)` orbit of `Li^(2+)` ion is x sec. The time period of revolution in the `2^(nd)` orbit of `He^(+) ion, should beA. x secB. `3/2 x sec`C. `2/3 x sec`D. `8/27 x sec`

Answer» Correct Answer - 3
`Talpha (n^(3))/(Z^(2))`
`x/y=9/3xx(2^(2))/(2^(3))`
`y=2/3 x sec`
4396.

Find the pH of a solution prepared by mixing 25ml of a 0.5M solution of HCI,10ml of a 0.5M solution of NaOH and 15 ml of water :-A. 4B. 3C. 0. 82D. 0. 10

Answer» Correct Answer - C
meq of HCI`=0.5xx25=12.5`
meq of `NaOH=0.5xx10=5`
remaning of HCI in mixture =7.5
Total volume `=25+10+15=50 mL`
`[H^(+)]=(7.5)/(50)`
pH = log `(7.5)/(50)=0.82`
4397.

p H of a solution of HCI is 4,its molar concentration isA. 4.0MB. 0.4MC. 0.0001MD. 12.0M

Answer» Correct Answer - C
`pH =-log[H^+]`
`rArr 4=-log[H^+]`
`therefore [H^+]=1xx10^(-4)(M)`
4398.

Find inverse of the following matrices using element (a) \( \left[\begin{array}{rr}7 & 1 \\ 4 & -3\end{array}\right] \) (b) \( \left[\begin{array}{rr}1 & 6 \\ -3 & 5\end{array}\right] \)

Answer»

(a) \(A = \begin{bmatrix} 7&1\\4&-3 \end{bmatrix}\)

\(|A| = \begin{vmatrix} 7&1\\4&-3\end{vmatrix} = -21 -4 = -25\)

\(A_{11} = (-1)^{1 + 1} (-3) = -3\)

\(A_{12} = (-1)^{1 +2}4 = -4\)

\(A_{21} = (-1)^{2 + 1}1 = -1\)

\(A_{22} = (-1)^{2 + 2} \,7 = 7\)

\(\therefore adj \,A = {C_{ij}}^T = \begin{bmatrix}-3 &-4\\-1&7\end{bmatrix}^T = \begin{bmatrix}-3 &-1\\-4&7\end{bmatrix}\)

\(\therefore A^{-1} = \frac{adj\,A}{|A|} = \frac{-1}{25} \begin{bmatrix}-3 &-1\\-4&7\end{bmatrix}\).

(b) \(B = \begin{bmatrix}1 &6\\-3&5\end{bmatrix}\)

\(|B| = \begin{vmatrix} 1&6\\-3&5\end{vmatrix} = 5+18 = 23\)

\(\therefore B^{-1} = \frac{adj\,B}{|B|} = \frac{1}{23} \begin{bmatrix}5 &-6\\3&1\end{bmatrix}\)

4399.

(i) If \( x \in N \) and \( \left|\begin{array}{ll}x & 3 \\ 4 & x\end{array}\right|=\left|\begin{array}{rr}4 & -3 \\ 0 & 1\end{array}\right| \), find the value(s) of \( x \)(ii) If \( x \in I \) and \( \left|\begin{array}{cc}2 x & 3 \\ -1 & x\end{array}\right|=\left|\begin{array}{ll}3 & 1 \\ x & 3\end{array}\right| \), find the value(s) of \( x \).

Answer»

(i) \(\begin{vmatrix}x&3\\4&3\end{vmatrix}\) = \(\begin{vmatrix}4&-3\\0&1\end{vmatrix}\)

⇒ x2 - 12 = 4

⇒ x2 = 16

⇒ x = -4 or x = 4.

(ii) \(\begin{vmatrix}2x&3\\-1&x\end{vmatrix}\) \(\begin{vmatrix}3&1\\x&3\end{vmatrix}\) 

⇒ 2x2 + 3 = 9 - x

⇒ 2x2 + x - 6 = 0

⇒ 2x2 + 4x - 3x - 6 = 0

⇒ (2x - 3) (x + 2) = 0

⇒ x = 3/2 or -2

4400.

3. Two point charges separated by a distance drepel each other with a force of ( 9 N \). If the separation between the becomes ( 3 d \), the force of repulsion will be

Answer»
3 Newton is the answer.