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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 19351. |
Which of the following is not a metal joining process?(a) Riveting(b) Bending(c) Pressing(d) Brazing |
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Answer» Right option is (b) Bending The explanation is: Riveting, brazing, pressing, soldering, adhesive bonding and bolt-screw fastening are few of the techniques of metal joining process. But, bending is not one of them, it is a shaping process. |
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| 19352. |
Magnetic particles with fluorescent coating are seen under which light?(a) White light(b) Infrared light(c) Black light(d) Ultraviolet light |
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Answer» The correct answer is (d) Ultraviolet light The explanation is: In magnetic particle testing, only ferrous materials can be tested using a magnetic particle test. The casting which is undergoing magnetic inspection, if it is coated with fluorescence, then it has to be viewed in an ultraviolet light only. |
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| 19353. |
Extrusion process is not suitable for which of the following?(a) Steel alloys(b) Non-ferrous alloys(c) Stainless steel(d) Iron |
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Answer» Correct choice is (d) Iron The best explanation: Extrusion process is not suitable for any of the iron alloys, neither is it suitable for iron metal. For extruding stainless steel or other non-ferrous alloys or steel alloys, extrusion process can be used. |
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| 19354. |
Which of the following is a ferrous foundry?(a) Brass foundry(b) Bronze foundry(c) High alloy steel foundry(d) Zinc-base foundry |
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Answer» Right answer is (c) High alloy steel foundry The best I can explain: Among the following, a high alloy steel foundry is a type of steel foundry and steel foundries come under ferrous foundries, while the remaining ones are non-ferrous foundries. |
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| 19355. |
What is the total capacity possessed by ferrous Indian foundries?(a) 1,00,000 tons(b) 1,50,000 tons(c) 2,00,000 tons(d) 2,50,000 tons |
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Answer» The correct option is (d) 2,50,000 tons To elaborate: There are many foundries in India. A few big foundries are located in Durgapur, Asansol, Rourkela, Bhopal and Bangalore. The total capacity possessed by Indian ferrous foundries is more than 2,50,000 tons. |
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| 19356. |
Which of the following is not a cast steel?(a) Low alloy steel(b) Magnesium alloy steel(c) Carbon steel(d) High alloy steel |
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Answer» Right option is (b) Magnesium alloy steel The best I can explain: Cast steel are a further classification of foundry metals and alloys under ferrous metals and alloys, that is, having iron base. Low alloy steel, high alloy steel and carbon steel are cast steels, but not magnesium alloy. |
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| 19357. |
How many rollers are used in four high rolling mill?(a) 3(b) 4(c) 8(d) 14 |
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Answer» Correct choice is (b) 4 The best I can explain: In four high rolling mill, there are four rolls employed for roliing. The direction of two rollers is the same and the remaining two rollers roll in opposite directions. |
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| 19358. |
Which form of weld is also called as ‘V’ weld?(a) Lap weld(b) Butt weld(c) Jump weld(d) Split weld |
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Answer» Right answer is (d) Split weld The best I can explain: In butt welding, the materials are butted are together. In split weld, the metals are kept like a fork in a ‘V’ shape. |
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| 19359. |
Which of the following operations involves reduction in length?(a) Upsetting(b) Drawing down(c) Setting down(d) Punching |
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Answer» The correct choice is (a) Upsetting Best explanation: There are a few operations, which are needed for a change of shape of the raw material to its finished form. This can be achieved using smith forging operation. Upsetting is one such operation that involves reduction in length for an increase the thickness. |
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| 19360. |
What are the number of opening available in the cutting torch used in oxygen cutting process?(a) 4(b) 5(c) 6(d) 7 |
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Answer» Correct option is (d) 7 Easy explanation: Just like any other gas welding equipment, the welding torch gets substituted by a cutting torch in oxygen cutting process. The total number of openings available in the torch are six, with a large opening at the center, making the count to seven. |
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| 19361. |
Which of the following is not a type of related processes?(a) Soldering(b) Percussion(c) Brazing(d) Hard-pressing |
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Answer» The correct option is (b) Percussion The explanation: Among the following, soldering, pressing and hard-pressing are few of the types of related processes. Percussion is one of the forms of resistance welding processes. |
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| 19362. |
What is the flame temperature of water gas?(a) 2500°C(b) 2800°C(c) 2300°C(d) 3100°C |
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Answer» Right choice is (c) 2300°C For explanation I would say: Water gas is a type of fuel gas that is used for the welding of thin sheets of steel which have a thickness of up to 8 mm. The flame temperature of water gas is approximately about 2300°C. |
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| 19363. |
Which of the following has least magnitude?(a) Slip velocity(b) Surface velocity(c) Entering velocity(d) Exiting velocity |
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Answer» Right choice is (c) Entering velocity Explanation: None. |
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| 19364. |
A thermit reaction produces heat up to what temperature?(a) 4800°F(b) 4000°F(c) 5600°F(d) 5300°F |
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Answer» Correct choice is (b) 4000°F The explanation is: None. |
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| 19365. |
Which of the following methods of heat treatment is best suitable for treating the output of cold rolling?(a) Quenching(b) Case hardening(c) Annealing(d) Cyanide hardening |
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Answer» The correct option is (c) Annealing The best explanation: The plastic deformation of metal plate in cold rolling includes changing of grain shape, increase in dislocation density and strain hardening of the material. These changes make the metal plate hard and ductile less. So, annealing is a process of heat treatment in which material regains its softness and relieves all its residual stresses. |
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| 19366. |
What does HAZ stand for?(a) Helium Aerated Zone(b) Heated Area Zone(c) Heat Affected Zone(d) Heat Allowed Zone |
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Answer» Right answer is (c) Heat Affected Zone For explanation: HAZ stands for Heat Affected Zone. This zone is generally the base of the metal or a thermoplastic material. This zone is not melted but the properties are altered by the welding process. |
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| 19367. |
Which of the following has the most magnitude?(a) Slip velocity(b) Surface velocity(c) Entering velocity(d) Exiting velocity |
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Answer» Right answer is (d) Exiting velocity The best I can explain: Exiting velocity, among the given four velocities, that is slip velocity, surface velocity, entering velocity and exiting velocity, the exiting velocity is considered to be having most magnitude. |
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| 19368. |
Which of the following forming processes is suitable for making utensils and cup shaped objects?(a) Forging(b) Rolling(c) Deep drawing(d) Wire drawing |
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Answer» Right choice is (c) Deep drawing Explanation: Deep drawing process is also known as cup drawing, which is a part of sheet metal forming process. It is widely used for making products like utensils, cup shaped objects, pressure vessels, gas cylinders, cans etc. In this method, a blank is placed on a die cavity and then held in a position using a holding plate and pressed against the die cavity by using a punch. |
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| 19369. |
What is the flame temperature of hydrogen?(a) 2000°C(b) 1200°C(c) 2700°C(d) 3300°C |
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Answer» Right option is (c) 2700°C Explanation: None. |
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| 19370. |
Which of the following is not a type of arc welding?(a) Plasma(b) Electro-slag(c) Submerged(d) Air-acetylene |
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Answer» The correct choice is (d) Air-acetylene The explanation: Among the following, plasma arc, electro-slag and submerged arc are few of the types of arc welding. Air-acetylene is one of the forms of gas welding processes. |
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| 19371. |
What is the temperature at the positive terminal in carbon arc welding?(a) 3800°C(b) 3900°C(c) 4000°C(d) 4100°C |
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Answer» Correct choice is (b) 3900°C The explanation is: Carbon is used in carbon arc welding, at the negative terminal of the cathode and the metal which is being worked upon functions as the positive terminal. The temperature of the electrode at the positive terminal is 3900°C. |
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| 19372. |
In arc welding process, the high quality alternator functions at what frequency?(a) 250 Hz(b) 300 Hz(c) 350 Hz(d) 400 Hz |
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Answer» The correct choice is (d) 400 Hz Explanation: In an arc welding process, there are alternators used for producing high current and function at lower frequency, and there are alternators which are of high quality and work at high frequency. The functioning frequency of these alternators is 400 Hz. |
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| 19373. |
What is the order of temperature of heat produced in an electric arc furnace?(a) 3000°C – 4000°C(b) 4000°C – 5000°C(c) 5000°C – 6000°C(d) 6000°C – 7000°C |
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Answer» Right option is (d) 6000°C – 7000°C Explanation: An electric arc furnace generates a lot of heat when the working metal comes in contact with the electrode. The heat that is generated in this joining process is of the order 6000°C to 7000°C. |
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| 19374. |
What is the maximum transformer power supply needed by the direct arc furnace?(a) 35,000 kVA(b) 40,000 kVA(c) 45,000 kVA(d) 50,000 kVA |
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Answer» The correct choice is (b) 40,000 kVA To elaborate: None. |
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| 19375. |
What can be the maximum pressure to be given to plastic for blow molding process?(a) 700 kPa(b) 750 kPa(c) 800 kPa(d) 850 kPa |
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Answer» Correct answer is (c) 800 kPa The explanation is: Air with an extreme amount of pressure, when is needed, it might mean the material is thicker and denser. The amount of pressure that can be provided depends totally on the material. The maximum pressure that can be provided in blow molding process is 800 kPa. |
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| 19376. |
In blow molding, to inflate soft plastic, which medium is used?(a) Air(b) Water(c) Oil(d) Alcohol |
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Answer» Right answer is (a) Air For explanation I would say: Blow molding process is typically used for the blowing process of hollow plastics. While blow molding, the plastic has to be inflated, in order to do so, air has to be blown inside with a high amount of pressure. |
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| 19377. |
If a force (F) is acting in the direction of displacement (s) on an object, what will be the equation of work (W)?1. F - s2. F × s3. F / s4. s /F |
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Answer» Correct Answer - Option 2 : F × s The correct answer is F × s.
then it can be expressed by the equation mentioned below- W = F × s
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| 19378. |
Which of the following is not an involuntary action?1. Saliva Secretion2. Bicycling3. Digestion4. Respiration |
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Answer» Correct Answer - Option 2 : Bicycling The correct answer is Bicycling.
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| 19379. |
ball a is thrown up vertically with speed 10m/s. at the same instant another balll b is released from rest at hight h .at time t is in second and v in m/s.what is acceleration of particle |
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Answer» At time t, speed of a= 10 – gt speed of b = 0 – gt Speed of a relative to b = 10 – gt + gt = 10m/s |
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| 19380. |
is 0.5 m/s2 . Initially the vehicles are separated by 400 m and the car is pulls back into the bus lane after it is 10 m ahead of the bus. The car is 10 m long and the bus is 25 m long . Find the time required for the car to pass the bus |
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Answer» Let t sec be the time required for the overtaking car to reach 10m ahead of the bus. The distance covered by the car in t sec =S1 = 10xt+1/2x0.5xt^2 m The distance covered by the bus in t sec =S2 = 2t m By the problem S1-S2 = 400+25+10+10 => 1/4t^2+10t-2t=445 => t^2+32t-1780=0 =>( t+16)^2=1780+16^2 => t = 45,1-16=29.1 sec |
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| 19381. |
What s the rato of the total number of girls to the total number of boys in a college ? I. There are 2000 students in the college out of which `40%` are girls. II. The ratio of the total number of bous to the total number of girls in the last year was `5:5.`A. The Statement A alone is sufficient to answer the question, but the Statement B alone is not sufficient.B. The statement B aone is sufficient to answer the questions. But the Statements A alone is not sufficient.C. Both Statement A and B together are needed to answer to question.D. You cannot get the answer from the statements A and B together, but need even more data. |
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Answer» Correct Answer - A Our aim is to calculate the ratio of the total number of girls to the total number of boys in a collage. From statement A, There are 2000 students in the college out of which `40%` are girls. `implies` Number of girls `=40/100xx2000=800` Thus, number of boys `=2000-800=1200` Ratio of number of boys to the total number of girls in a college `=1200:800` `implies` Ratio of number of boys to the total number of girls in a college `=3:2` So, statement A is sufficient to reach at the solution. From statement B, The ratio of the total number of boys to the total number of girls in the last year was `5:5` Here, only last year ratio is given but this data is not sufficient to calculate rat io of number of girls to the total number of boys in a colleage. So, S tatement B alone is not sufficient to reach at teh solution. |
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| 19382. |
Triangle ABC has angle BAC equal to `90^(@).` What is the measure of the angle ABC? A. The angle ABC is `35^(@)` B. The angle CBA is `55^(@)`A. if the statement A alone is sufficient to answer the question, but the statement B alone is not sufficient.B. if the statement B alone is sufficient to answer the question, the statement A alone is not sufficient.C. if both statements A and B together are needed to answer the question.D. if either the statement A alone or statement B alone is sufficient to answer the question |
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Answer» Correct Answer - D From statement A `angleABC=180^(@)-(angleBAC+angleACB)` `=180^(@)-(90^(@)+35^(@))=55^(@)` From statement B, `angleABC=55^(@)` |
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| 19383. |
Find the number of days in which Q can do a job if P can do the same job in 8 days. A. Q is `60%` more efficient than P. B. P and Q togetyher can do the job in 10/3 days. C. P is `75//2%` less efficient than Q.A. only A is sufficientB. Only B is sufficientC. Either A or B is sufficientD. Any of them |
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Answer» Correct Answer - D Since each statement provides data related to another one so any of the three statements is sufficient. |
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| 19384. |
What is the rate of interest at which Binod has invested money? A. The compound interest at this rate of Rs.2500 in 2 yrs is equal to the simple interest in 3 yrs of Rs. 5150 at the same rate. B. The total simple interest on an investment of Rs. 12000 for 3 yrs and Rs. 10000 for 5 yrs at this rate is R. 5160 C. In 3 yrs Rs. 1500 at the same rate becomes Rs. 1725 by simple interest.A. Any of themB. A and either B or CC. Only CD. Only A and either B or C |
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Answer» Correct Answer - A Let the rate of interest be `r%` `A. 2500[(1+(r)/(100))^(2)-1]=5150xxrxx(3)/(100)` `B. 12000xxrxx3/100+10000xxrxx5/100=5160` `C. r=(1725-1500)/(3xx1500)xx100=5%` Hence any one of them is sufficient. |
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| 19385. |
A person travels from X to Y and back again. How long wil it take in travelling both the ways by bus? A. It takes 21 hours in travelling form X to Y by train and returing by bus. II. The distance between X and Y is 648 km. C. A person can save 3 hours if he travels both the ways by train as compared to travelling by bus on the one side and returning by train.A. Only A and C togetherB. B and either A or CC. Any two of themD. All statements are necessary |
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Answer» Correct Answer - D From statement (A) and (C ), The person will take `(21-3)=18` hrs, if he travels both ways by train. So it takes `((18)/(2)=9)` hrs if he travels one way by train. Hence, he will take `(9+3)=12` hrs if he travels one way by bus. So, required time `=12xx2=24` hrs. |
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| 19386. |
A glass tube of length 1.0m is completely filled with water. A vibrating tuning fork of frequency 500hz is kept over the mouth of the tube and the water is drained out slowly at the bottom of tube. If velocity of sound in air is 330m/s , then the total number of resonances that occur will be |
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Answer» λ=V/n for closed tube, suggestions of resosances respective at λ/4, 3λ/4, 5λ/4 So total number of resosances obtained will be 3 |
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| 19387. |
Quantity I: Profit percent when an article of cost price Rs. 160 is sold for Rs. 184. Quantity II: When a person busy an article whose marked price is Rs. 2400 for Rs. 2016, then percentage discount availed by him.A. Quantity - I `gt` Quantity -IisB. Quantity `-I lt` Quantituy - IIC. Quantity `-Ige` Quantity - IID. Quantity `- I le` Quantity - II |
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Answer» Correct Answer - B Quantity - I `C.P. =160` `S.P. =184` Profit `=184-160=24` Profit `%=(24)/(160)xx100` `therefore Profit %=15%` Quantity - II `M.P. =2400` `S.P. =2016` Discount `=2400-2016=384` Discount `%(384)/(1400)xx100` Discount `%=16%` `therefore` Quantity I `lt` Quantity II |
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| 19388. |
What is the average monthly income of a man if he saves Rs.85000 during a year ? A. The average monthly expenditure for the first 4 months is Rs. 18000. B. The average montly expenditure for the next 8 months is Rs.21000.A. if the data instatement A alone is sufficient to answer the question.B. if the data in statement B alone is sufficient to answer the question.C. if the data either in statement A alone or instatement B alone is suffieient to answer the questionD. if the data in both statements A and B together are necessary to answer the question. |
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Answer» Savings of the mans `=Rs. 85000" "…(i)` From statement A we get `Rs.(21000xx8)=Rs.72000" "...(ii)` From (i), (ii) and (iii), we can find the income and his average monthly income. |
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| 19389. |
Meri naak kat jayegi what is its English form? |
| Answer» disgraced/dishonored | |
| 19390. |
In a class of 180 students, how many girls scored over `70%` in the Chemistry test ? I. Exactly 15 boys scored over `70%` in the test. II. 2/3 rd of the class scored over `70%` in the test.A. If the dats in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.B. If the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.C. If the data either in statemetn I alone or in statement II alone are sufficient to answer the question.D. If the data in both the statements I and II together are not sufficient to answer the question. |
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Answer» From II: it is clear that out of 180 s tudents, 120 students second over `70%` In the test. From `1:15` boys scored over `70%.` scored over `70%=120-15=105.` |
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| 19391. |
Write the properties of charge . Explain ! |
Answer»
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| 19392. |
What is the cost of painting two adjacent walls of a hall having no door or window at Rs.450 pe `m^(2)`?, I. Length and breadth are in the ratio of `3:2` respectively. II Perimeter of the hall is 50 m and highht is one-fourth of the perimeter.A. if the data in statement I alone are sufficient to answer the questin, while the data in statement II alone are not sufficient to answer the question.B. if the data in statement Ii alone are sufficient to answer the questin, while the data in statemetn I alone are not suffcient to answer the question.C. id the data in both statements I and II alone are surfficient to answer the question.D. if the data in both statements I and II together are not sufficient to answer the question. |
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Answer» `{:(22.5 " "15),("Length: Breadth"=3:2),(" "darr),(" "3x:2x):}` Height `=50xx1/4=12.5` Perimeter `=2(3x+2x)=50impliesx=5` So, area of two any adjacant walls `=b xxh+1xxh=h(1+b)` Total cost of painting on wall `=12.5xx25xx450=Rs.140625` |
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| 19393. |
Two numbers P and Q are given What is `P+Q` ? (i) LCM of P and Q is 36 times their HCF (ii) The sum of LCM of P & Q and their HCF is 444. `P/10+Q/10` is an integer. (iv) `P+Qgt150` Which of the given statements are redundant to find the answer of the question.A. statement(ii)B. statement (iii)C. statement (iv)D. statement(i) |
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Answer» Let x men typisst do the typing in (n-5) days And y woment typist do the typing in n days So, `x(n-5)=y(n)` From option (i) Let `x=2p` And `y=5p` `2p(n-5)=5p(n)` `2n-10=5n` `n=-(10)/(3)` not possible From option (ii), `10p(n-5)=3p(n)` `10n-50=3n` `7n=50` `n=(50)/(7)` it is possible From option (iii) `9p(n-5)=7p(n)` `9n-45=7n` `2n=45` `n=(45)/(2)` possible From option (iv) `10p(n-5)=7p(n)` 10n-50=7n` `n=(50)/(3)` possible So, (ii),(iii) and (iv) are possible. |
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| 19394. |
Five men and five women are be arranged in a row while seating in a party. Quantity I: number of ways of arranging 5 men and 5 women such that no two men or women are adjacent to each other. Quantity II: Number of ways of arranging 5 men and 5 women such that all men sit together.A. Quantity I `gt` Quantity IIB. Quantity I `lt` Quantity IIC. Quantity I `ge` Quantity IID. Quantity I `le` Quantity II |
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Answer» Correct Answer - B For quantity I `to` Since S is an acute angle means `lt90^(@)` `therefore(a+40)+alt90` `(2a+40)lt90` `2alt50` `alt25^(@)` For quantity II `to 25^(@)` `therefore` Quantity `I lt` Quantity II |
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| 19395. |
What is the cost of painting the two adjacent walls of a reactangular hall which has no windows or doors ? I. The area of the base of hall is 124 sq. metres. II. The breadth, length and the height of the hall are in the rato of `3:4:5.` III. Area of one wall is 40 square meters.A. Only IB. Only IIC. Only IIID. Data inadequate |
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Answer» Cost price per unit is not given, So, Data is not sufficient to answer. |
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| 19396. |
What will be the area of a 2 metre wide boundary around a reactangular field ? I.The breadth of the field is one-fourth of its permeter. Area of the field is 144 sq. metre. II. The ratio of the length and breadth is respectively `3:2.` III Area of the field is 216 sq. metre.A. I, II and IIIB. only I or II and IIIC. I and IID. Anyone of the three statements |
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Answer» Correct Answer - B From statement I, If Length = x metre and breadth = y metre, then `y=(1xx2)/(4)(x+y)" "implies2y=x+yimpliesy=x` `thereforex^(2)=144" "impliesx=sqrt(144)=12` metre area of field `=(16)^(2)-(12)^(2)=256-144=112` sq. metre From statements II and III, Length = 3x metre Breadth = 2x metre `therefore3x xx2x=216` `impliesx^(2)=(216)/(3xx2)=36` `impliesx=6` `therefore` Length = 18 metre, Breadth = 12 metre area of the field with boundary `=(18+2xx2)(12+2xx2)` `=22xx16=352` sq. metre `therefore` Area of boundary `=352-216=136` sq. m. |
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| 19397. |
Find the average of five consective odd numbers. I. The difference of fifth number and the first number is 7. II. The sum of the first two numbers is 5 more than the fifth number.A. if the data in statement I alone are sufficient to answer the questin, while the data in statement II alone are not sufficient to answer the question.B. if the data in statement II alon are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.C. if the data either in statement I alone or in statement II alone in sufficient to answer the question.D. if the data given in both the statement I and II together are not suffesient to answer the questin, and |
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Answer» Correct Answer - B From II statement, we get result. |
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| 19398. |
What is the cost of painting two adjacent walls of a hall having no door or window at Rs. 450 per `m^(2)` ? I. Length and breadth are in the ratio of `3:3` respectively. II. Permeter of the hall is 50 m and height is one-fourth of the perimeter.A. if the data in Statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer to question.B. if the data in statement Ii alone are sufficient to answer the questin, while the data in statemetn I alone are not suffcient to answer the question.C. if data either in statement I alone or in statement II alone are sufficient to answer the question.D. if the data in both the statements I and II together are necessary to answer the question. |
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Answer» `{:(22.5" "15),("Length : Breadth"=3 : 2),(" "darr),(" "3x.2x):}` Height `=50xx1/4=12.5` Perimeter `=2(3x+2x)=50` `impliesx=5` So, area of two any adjacent walls `=bxxh+lxxh=h(l+b)` Total cost of painting on wall `=12.5xx25xx450=Rs. 140625` |
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| 19399. |
Rajan investes `40%` fo the amount invested by Gagan. Gagan withdraw whole amount from the business after 6 months. Ahmad joins the business with the investment of Rs.x in a month after Gagan had withdrawn from the business. At the end of the year Rajan and Ahmad share same amount of profit. `to` If investment of Gagan is Rs. 1800 then which of the following may be the investment of the Ahmad. `{:((i),1800,(ii),5400,(iii),2700,(iv),7200,(v),5000):}`A. (i)and(ii)B. only (ii)C. (i),(ii) and (iv)D. (i),(ii),(iii)and (iv) |
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Answer» Correct Answer - D Let width of the field `=x` cm So, length of the field will be `=(x+6)` cm So, `9/4xx` (Area of path) = Area of the field `implies9/4[(x+6)xx3+(x-6)xx3]xx2=x(x+6)` From this equation , we can find out the value of x and hence all values can be find out. |
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| 19400. |
Find the radius of the semic-circle. I. The area of semi-circle is equal to the area of the rectangle. II. The breadth of rectangle is 5 cm less than its length and its permeter is 50 cm.A. if the data in statement I alone are sufficient to answer the questin, while the data in statement II alone are not sufficient to answer the question.B. if the data in statement II alon are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.C. if the data either in statement I alone or in statement II alone in sufficient to answer the question.D. if the data in both the statements I and II together are necessary to answer the question. |
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Answer» From statement II, length x= cm, bradth `=(x-5)` cm `therefore 2(x+x-5)=50implies2x-5=25` `implies 2x=25+5=30implies x=15` cm = length `therefore` Breadth `=15-5=10` cm From statement I, `(pir^(2))/(2)=15xx10" "impliespir^(2)=300` `impliesr=sqrt((300)/(pi))` This gives us value of radius. |
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