This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Inductive effect involveA. partial displacement of `sigma-` electronsB. delocalisation of `pi-` electronsC. delocalisation of `sigma-` electronsD. displacement of `pi-` electrons |
| Answer» Correct Answer - A | |
| 2. |
What is seasonal variation? Give an example. |
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Answer» Seasonal variations refers to the variations caused annually by the seasons of the year, which are regular, periodic and short term variations in the time series. |
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| 3. |
Write any two limitations of Index Number. |
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Answer» 1. Many formulae are used and they give different answers for the Index. 2. As the customs and habits change from time to time, uses of commodities also vary. |
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| 4. |
Define index number. Mention three limitations of index numbers. |
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Answer» Index number is a statistical measure designed to show an average change in a variable or group of related variables over a period. The limitations are: • Many formulae are used and they give different answers for the index. • As the customs and habits change from time to time, the use of commodities also vary. • There is an ample scope for bias in the construction of index number. |
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| 5. |
Biostatistics |
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Answer» Biostatistics are the development and application of statistical methods to a wide range of topics in biology. It encompasses the design of biological experiments, the collection and analysis of data from those experiments and the interpretation of the results.
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| 6. |
Cytoplasmic inheritance is due to the cytoplasm of the zygote comes from the ------ a. Sperms b. Ovum c. Both (a and b) d. None of All |
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Answer» Cytoplasmic inheritance is due to the cytoplasm of the zygote comes from the Ovum. |
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| 7. |
An artist technician, who realizes what director wants to see, is known as? |
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Answer» Cinematographer |
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| 8. |
Expand the term LD and PA’s in term of film industry. |
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Answer» Lightening director and Production Assistants |
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| 9. |
Example of talent is I. Host II. Guest III. Writer IV. Makeup Artist Choose the right option A. Both I & II B. Both III & IV C. All of the above D. None of these |
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Answer» Correct answer is A. Both I & II |
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| 10. |
Who heads the radio channel? A. Radio Producer B. Radio Jockey C. Radio Presenter D. Station Director |
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Answer» D. Station Director Station Director heads the radio channel. |
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| 11. |
Who was the Walter Lipmann? A. American Media Philosopher B. Soviet Media Practitioner C. Soviet Media Philosopher D. American Media Practitioner |
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Answer» A. American Media Philosopher American Media Philosopher was the Walter Lipmann. |
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| 12. |
Consider the following statements regarding gymnosperms (A) In gymnospers, the male and female gametophytes have an independent existence (B) The multicellular female gametophyte is retained within the megasporangium (C) The gymnosperms are heterosporous Of these statements.A. (A) and (B) are true but (C) is falseB. (A) and (C) are true but (B) is falseC. (B) and (C) are false but (A) is trueD. (B) and (C) are true but (A) is false |
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Answer» Correct Answer - D |
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| 13. |
Choose the correct one(1) A- Chorionic villi → forms placenta(2) B-Yolk sac → Prevents desiccation of embryo(3) C- umbilical cord → Haemopoiesis(4) D- Blastocyst → Forms the embryo |
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Answer» (1) A- Chorionic villi → forms placenta |
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| 14. |
Name the tropical American tree which produces the least dense wood known? |
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Answer» XALSA tropical American tree which produces the least dense wood known. |
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| 15. |
Sindhuja was extremely good at making traditional sweets which she had learnt from her grandmother. She decided to start selling the sweets through advertising in social media. Her business picked up and she got a lot of orders from clients all across India. Seeing her huge success, her friend Raman advised that she should open a shop in the market area to expand her business. He expressed interest in the business and was ready to invest money so that they could do the business together. What form of business organisation does Raman and Sindhuja start? a. Sole proprietorship b. Partnership c. Private company d. Public company |
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Answer» b. Partnership |
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| 16. |
Victor industries has been one of the leading companies in Mobile phone industry in India. The company decided to launch a new Model AI 1 which will have inbuilt latest software to encourage hands free use and enhance the customer experience through 3D photos. They are also looking into ideas to use ecofriendly recyclable materials for the body of the phone which will cause less environmental damage. Identify the two factors of PESTEL model from the above case study.A. Economic, Social B. Ecological, Technological C. Legal, EconomicD. Social, Political |
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Answer» B. Ecological, technological |
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| 17. |
Monik Ltd., was the market leader in the Mobile Phone industry in 2000. The company was well known for it’s affordable phones. In 2007, a new company launched new Mobile models with latest technologies and captured the market. Monik Ltd., did not expect this and lost the entire market share and had to close their operations. Which of the following SWOT analysis framework does this case indicate that Monik Ltd., failed to do? a. Strengths b. Weakness c. Opportunities d. Threats |
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Answer» Answer is d. Threats |
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| 18. |
Justify the importance of coordination by any two factors |
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Answer» Coordination is a continuous process, by which a manager integrates the inter-related activities of different departments in order to achieve the common organisational goals. The need and importance of coordination can be judged from these points:
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| 19. |
The most important attribute of information quality that a manager requires is: |
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Answer» The most important attribute of information quality that a manager requires is relevance. |
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| 20. |
The maximum value of probability of any event is – (A) 1 (B) 0(C) 2(D) 1/2 |
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Answer» Correct answer is (A) 1 |
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| 21. |
cot(π+θ) =(A) sinθ(B) tanθ(C) cotθ(D) cosθ |
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Answer» Correct option is: (C) cotθ |
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| 22. |
Show that any positive odd integer is of the form (6q + 1) or (6q + 3) or (6q + 5), where q is some integer. |
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Answer» As per Euclid’s lemma, We know that, If a and b are two positive integers, then a = bq + r Where q and r are integers such that 0 ≤ r < b. Let a be any positive odd integer and b = 6. ∴ a = 6q + r Where q and r are integers such that 0 ≤ r < 6. ⇒ r = a − 6q Where r is an integer such that 0 ≤ r < 6. ∴ r is odd interger and 0 ≤ r < 6. (∵ a is odd and 6q is even & odd − even = odd) ∴ r can be either 1, 3 & 5. (Because 1, 3 & 5 are only odd integer in between 1 to 6) Case I :- If r = 1, then a = 6q + 1. Case II :- If r = 3 then a = 6q + 3. Case III :- If r = 5 then a = 6q+5. Hence, Any positive odd integer is of the form (6q + 1) or (6q + 5), where q is some integer. Hence Proved. |
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| 23. |
The ratio of boys and girls in the school is 5 : 6. If 24 new boys are joined the school then the ratio of boys and girls becomes 9 : 10. Find the number of girls in the school?1. 1802. 2003. 3204. 3605. 370 |
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Answer» Correct Answer - Option 4 : 360 Given: The ratio of boys and girls in the school is 5 : 6. After joining 24 new boys, the the ratio of boys and girls becomes 9 : 10. Calculation: Let the number of boys in the school be 5x. Then the number of girls in the school is 6x. After joining 24 new boys, the number of boys = 5x + 24 According to the question; The new ratio of boys and girls = 9 : 10. ⇒ (5x + 24)/6x = 9/10 ⇒ 50x + 240 = 54x ⇒ 4x = 240 ⇒ x = 60 Then, the number of girls = 60 × 6 = 360 ∴ The number of girls in the school is 360. |
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| 24. |
The ratio of boys and girls in the school is 7 : 9. When 22 new boys are joined in this school then the ratio become 9 : 10. How many girl in this school?1. 1802. 2003. 1604. 1705. 220 |
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Answer» Correct Answer - Option 1 : 180 Given: The ratio of boys and girls = 7 : 9 Number of new boys = 22 New boys to girls ratio = 9 ∶ 10 Calculation: Let be boys = 7x and girls be = 9x ⇒ {(7x+ 22)/9x} = 9/10 ⇒ 70x + 220 = 81x ⇒ 11x = 220 ⇒ x = 20 Then put the value in Girls ⇒ Girls = 20× 9 = 180 ∴ Girls are 180 |
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| 25. |
A plane body has perpendicular axes OX and OY marked on it and is acted on by following forces 5P in the direction OY, 4P in the direction OX, 10P in the direction OA where A is the point `(3a, 4a)` 15 P in the direction AB where B is the point `(-a, a)`. Express each force in the vector form & calculate the magnitude & direction of the vector sum of these forces. |
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Answer» Correct Answer - `5Phat(j), 4Phat(i), 6Phat(i)+8Phat(j), -12Phat(i)-9Phat(j), sqrt(20)P, tan^(-1)[-2]` with +ve x-axis `vecF_1=5Phatj,hatF_2=4P_hati,hatF_3=10P((3hati+4hatj)/5)=(6hati+8hatj)P` `vecF_4=15P(((-hati-3hatj)+(hatj-4hatj)))/5=-12Phati-9Phatj` `vecF=vecF_1+vecF_2+vecF_3+vecF_4=5Phatj+4Phati+6Phati+8hatj-12Phati-9Phati=-2Phati+4Phatj` `|vecF|=Psqrt((-2)^2+(4)^2)=sqrt(20)P` `tan alpha=4/(-2)implies alpha=tan^(-1)(-2)` |
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| 26. |
In ta bag there are coin of 25p,10p and 5p in the ratio 1 : 2 : 3. If there are Rs. 45 in all then find how 25p coin are there?1. 602. 653. 704. 785. 75 |
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Answer» Correct Answer - Option 5 : 75 Calculation: Let total 25 paise coins be x So, we can can calculate the values as follows: (0.25 × x) + (0.10 × 2x) + (0.05 × 3x) = 45 ⇒ 0.25x + 0.2x + 0.15x = 45 ⇒ 0.6x = 45 ⇒ x = 45/0.6 = 75 ∴ There are 75 coins of 25p |
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| 27. |
Paragraph - How to Keep fit and fine. Under 100 words |
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Answer» Fitness is very important always. And fitness can be achieved only through exercise. Exercise helps in preventing excess weight gain or maintaining weight loss. When you engage in physical activity, you burn calories. Exercise keeps your blood flowing smoothly, which decreases your risk of cardiovascular diseases. In fact, regular physical activity can help you prevent or manage a wide range of health problems and concerns, including stroke, metabolic syndrome, type 2 diabetes, depression, and certain types of cancer, arthritis and falls. Exercise is not beneficial for body, but mind and emotions also. Physical activity stimulates various brain chemicals that may leave you feeling happier and more relaxed. To augment fitness, one must also do yoga and meditation. They help us keep our mind and soul healthy. In conclusion it can be said that all of us must include exercise in our daily routine. |
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| 28. |
With the introduction of the mobile-app based model in the taxi market, the business is experiencing a vast difference. The earnings of the cab drivers are skyrocketing with many of them earning anywhere between Rs. 75,000 to Rs.1,00,000 per month. Citing one example of a cab driver, Mr. Lokesh R. from Bengaluru earns around Rs.80,000 per month and sometimes earns more than Rs.1,00,000 per month if he gets more rides. He adds that prior to this, he was making a meager amount of Rs.15,000 to Rs. 20,000 per month. Mr. Arvind Singhal, CEO of Taxi for Sure said that with such changes in the taxi business, many educated professionals have approached him to become cab drivers. They are looking at it as an entrepreneurial venture against a 9:00 a.m. to 5:00 p.m. IT job. The online taxi market is driven by mobile app technology. Also, the highly competitive rates is giving a tough competition to the local cab drivers. The taxi companies blooming in India are Ola, Uber and Taxi for Sure. Ola, which is currently valued at $ 2.5 billion, started its operations four years ago and is currently present in over 100 cities. Uber, being globally successful and valued above $ 50 billion started business in India in August 2013 and is currently present in 11 cities. Uber across the world runs only on credit card payment system, wherein the customer fills in the credit card details while booking the cab. But, looking at the cash payment demand in Indian market, the global giant has made a shift in the payment method to make a place in the taxi market. The taxi market is growing leaps and bounds and currently estimated to be around Rs,11,000 crore and is growing in double digits. The drivers are making hay while the sun shines by earning more than the regular cab drivers. In case of Uber, for every trip made, the drivers are paid 80% of the fare, which is credited to their bank account. Also, a bonus of Rs,150 is paid for every trip during the peak hours and Rs. 50 during non-peak hours. Ola, provides the bonus to drivers if they do six trips in a day, while Taxi For Sure charges the drivers with only 8-12% of the ride fare. With such schemes introduced, the drivers are encouraged to serve the customers. At the same time, the customers also get a cab when in need. Hence, it appears to be a win-win situation for both the parties. Citing one more example, Mr. Basavaraj from Bengaluru who was under heavy family debts bought(i) How has the mobile-app based taxi business model brought a revolution among the masses?(ii) In what way have the cab drivers benefited after the shift to mobile-app based taxi hailing service?(iii) Why are professionals now opting to become cab drivers over their 9:00 a.m. to 5:00 p.m. IT job?(iv) What are the various payment benefits given to the cab drivers by the companies?(v) The cab drivers working under mobile-app based taxi model are benefited. Cite an example of happy cab drivers from the passage.(vi) How are families joining hands with the cab drivers to support them?(vii) How the companies help the drivers in new purchase of the cabs?(viii) Have the mobile-app based cabs affected the regular cabs, if yes, explain? |
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Answer» (i) Customer can book a cab on a single click. Post booking, the cab driver receives the customer from his doorstep. This makes the customer’s ride easier as opposed to arguments with regular cab drivers and this is how the mobile-app based taxi business model has brought a revolution among the masses. (ii) The cab drivers are not only paid well but also receive bonus for their efforts put in. Moreover, they have a systemized process in order to take the booking from a customer and to receive payments. (iii) From the app-based taxi model, the cab drivers can now make anywhere between Rs. 80,000 to Rs.1,00,000 a month. Moreover, it is not a 9:00 a.m. to 5:00 p.m. job. Professionals see it as an entrepreneurial venture and hence opt it for both, its flexibility as well as the good pay. (iv) In case of Uber, the drivers are paid 80% of the fare for every trip made, which is directly credited to their bank account. Also, a bonus of Rs.150 is paid for every trip during the peak hours and Rs. 50 during non-peak hours. Ola, provides the bonus to drivers if they do six trips in a day. Taxi For Sure charges the drivers with only 8-12% of the ride fare. (v) Mr. Lokesh R. from Bengaluru, working under the mobile-app based taxi model business earns anywhere between Rs.80,000 to Rs.1,00,000 per month. He can be surely called a Happy cab driver as prior to this change, he was making a meag (vi) Work pressure is a part and parcel of the cab driver’s job. The cab drivers can never keep their mobiles away, as they can’t ascertain when they will get their next call. At such times, wives of cab drivers help them track the cab movements through Google Maps and coordinate with them. (vii) There are companies who offer cab purchasing schemes. Under this scheme, the drivers can purchase a cab, the financing for which is done by the companies. Here, the cab/vehicle for initial few years is attached to the company. (viii) The mobile-app cabs have affected the regular cab drivers severely. This is because regular cab drivers are difficult to track and they have their choices for a place. Very few regular cabs are air-conditioned and in a good state |
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| 29. |
Fill in the blanks :-If H.C.F. of two numbers are 25 and L.C.M. is 50 then what will the multiplication ................. |
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Answer» If H.C.F. of two numbers are 25 and L.C.M. is 50 then what will the multiplication 1250. |
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| 30. |
Let there be a spherically symmetric charge distribution with charge density varying as `rho(r)=rho(5/4-r/R)` upto `r=R`, and `rho(r)=0` for `rgtR`, where r is the distance from the origin. The electric field at a distance r(rltR) from the origin is given byA. `(rho_(0)r)/(4epsilon_(0)) ((5)/(4)-(r)/(R))`B. `(4pi rho_(0)r)/(3 epsilon_(0)) ((5)/(3)-(r)/(R))`C. `(rho_(0)r)/(4epsilon_(0)) ((5)/(3)-(r)/(R))`D. `(4rho_(0)r)/(3epsilon_(0)) ((5)/(4)-(r)/(R))` |
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Answer» Correct Answer - C `int vec(E). dvec(A) = (Sigmaq)/(epsilon_(0))` `E (4pir^(2)) = (1)/(epsilon_(0)) int rho dV` `Sigma q = int_(0)^(r) rho dV = int_(0)^(r) rho_(0) ((5)/(4)-(r)/(R)) 4pir^(2)dr` `Sigma q = 4pi rho_(0) [(5)/(4)((r^(3))/(3))-(1)/(R)((r^(4))/(4))]` `E (4pir^(2)) = (4pi rho_(0))/(epsilon_(0)) [(5)/(4)((r^(3))/(3))-(r^(4))/(4R)]` |
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| 31. |
Charges `q` is uniformly distributed over a thin half ring of radius `R`. The electric field at the centre of the ring isA. `q/(2pi^(2)epsilon_(0)r^(2))hat(i)`B. `q/(4pi^(2)epsilon_(0)r^(2))hat(j)`C. `-q/(4pi^(2)epsilon_(0)r^(2))hat(j)`D. `-q/(2pi^(2)epsilon_(0)r^(2))hat(i)` |
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Answer» Correct Answer - D `vec(E)=(2k lambda)/r(-hat(j))=2/((4pi in_(0) r))q/((pi r))(-hat(j))` |
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| 32. |
Let there be a spherically symmetric charge distribution with charge density varying as `rho(r)=rho(5/4-r/R)` upto `r=R`, and `rho(r)=0` for `rgtR`, where r is the distance from the origin. The electric field at a distance r(rltR) from the origin is given byA. `(rho_(0)r)/(3epsilon_(0))(5/4-r/R)`B. `(4pirho_(0)r)/(3epsilon_(0))(5/3-r/R)`C. `(rho_(0)r)/(4epsilon_(0))(5/3-r/R)`D. `(4rho_(0)r)/(3epsilon_(0))(5/4-r/R)` |
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Answer» Correct Answer - C Total charge `Q=underset(0)overset(tau)(int)rho dV=underset(0)overset(tau)(int)rho_(0)(5/4-r/R)4pi r^(2)dr` `=4pi rho_(0) underset(0)overset(tau)(int)((5r^(2))/4-r^(3)/R)dr=4pi rho_(0)[(5r^(3))/12-r^(4)/(4R)]` `E=(KQ)/r^(2)=1/(4pi in_(0)r^(2))4pi rho_(0)[5/12 r^(3)-r^(4)/(4R)]` `=(rho_(0)r)/(4 in_(0))[5/3-r/R]` |
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| 33. |
What is the decrease in weight of a body of mass 600 kg when it is taken in a mine of depth 5000 m? (Radius of earth = 6400 km, g = 9.8 m/s2) |
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Answer» Given: m = 600kg, g = m/s2 d = 5000 m, R = 6400 km = 6.4 x 106 m To find: Decrease in weight of body (dW) Formula: gd = g [1- \(\frac{d}{R}\)] Calculation: Weight of body on the earth surface, W = mg = 600 x 9.8 = 5880 N Since, Wd = mgd From formula, Wd = mg [1- \(\frac{d}{R}\)] =5880 [1- \(\frac{5\times10^3}{6.4\times10^6}\)] =5880 [\(\frac{6.4-0.005}{6.4}\)] = {antilog{log(5880) + [log(6.395) - log(6.4)]}} = {antilog[3.7694 + (0.8058 – 0.8062)]} = {antilog(3.7694 + 1.9996)} = {antilog(3.7690)} ∴ Wd = 5875 N ∴ Decrease in weight = W - Wd = 5880 – 5875 dW = 5 N Decrease in weight is 5 N. |
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| 34. |
Statement-1: Coefficient of viscosity of liquid decreases while that of a gas increase, with increasing temperature. Statement-2: Density of a liquid and tht of a gas vary opposite manner with increase in temperature.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - C Density chagnes symmetrical in cas of gas as well as liquid |
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| 35. |
Statement-1: When an object is completely submerged in a liquid, the buoyant force and weight of object are action reaction pair. Statement-2: Magnitude of Buoyant force equals the weight of fluid displaced by object.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - D Action and reaction never act on same body |
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| 36. |
Statement-1: At a steelworks, molten iron is heated to `1500^(@)`C to remove impurities. It is say that molten iron contains more heat than solid iron. Statement-2: Solid iron at melting point needs to be supplied heat corresponding to its latent heat of fusion for phase change.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - D Heat is energy in transit |
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| 37. |
Two tunning forks produce a beat frequency of 2 Hz in air The same tuning forks are put in water. Statement-1: The beat frequency in water is higher than in air Statement-2: The velocity of sound in water is higher than in air.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - D f = f -f (Beat frequency is independent of medium) |
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| 38. |
Statement-1: A body is emitting primarily red light. As the temperature of body is increased it may emit primarily yellow light. Statement-2: Rate of radiation emitted by a body increases as the temperature increases.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - B Correct reason is that the spectrum is shifted as temperature is increased. |
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| 39. |
Statement-1: Two rigid, identical and uniformly charged non conducting spheres with same charge are placed on a sufficiently rough surface, then spheres must be in equilibrium. Statement-2: If net force on a point charge is zero it is in equilibrium.A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.B. Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.C. Statement-1 is true, statement-2 is false.D. Statement -1 is false, statement -2 is true. |
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Answer» Correct Answer - D Not in rotational equilibrium |
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| 40. |
A rocket is moving in a gravity free space with a constant acceleration of 2 ms-2 along + x direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in + x direction with a speed of 0.3 ms-1 relative to the rocket. At the same time, another ball is thrown in -x direction with a speed of 0.2 ms-1 from its right end relative to the rocket. The time in seconds when the two balls hit each other is__ |
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Answer» Maximum displacement of the left ball from the left wall of the chamber is 2.25 cm, so the right ball has to travel almost the whole length of the chamber (4m) to hit the left ball. So the time taken by the right ball is 1.9 sec (approximately 2 sec) |
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| 41. |
Consider the system shown below, with two equal masses `m` and a spring with spring constant `K`. The coefficient of friction between the left mass and horizontal table is `mu=1//4`, and the pulley is frictionless. The spring connecting both the blocks is massless and inelastic. The system is held with the spring at its unstretched length and then released. The extension in spring when the masses come to momentary rest for the first time isA. `(3mg)/(2K)`B. `(mg)/(2K)`C. `(mg)/(K)`D. `(2mg)/(K)` |
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Answer» Correct Answer - A From work energy theorem, the masses stop when total work done on them is zero. `W=mgx-(1)/(2)kx^(2)-mu mg x =0` `:. (2mg)/(k)(1-mu)=(3mg)/(2k)` |
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| 42. |
A ball is thrown from the top of a `60m` high tower with velocity `20sqrt(2)m//s` at `45^(@)` elevation of path at highest point. (`g=10m//s^(2)`) A. `10m`B. `20m`C. `40m`D. `200m` |
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Answer» Correct Answer - C `R=(v^(2))/(a_(c))=((ucos45^(@)))/(g)=((20)^(2))/(10)=40m` |
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| 43. |
A ballet dancer, an acrobat and an ice skater make use of an important principle in physics. Which is that principle? |
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Answer» Conservation of angular momentum. |
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| 44. |
The key feature of Bohr’s theory of spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid. The rule to be applied is Bohr’s quantization condition.A diatomic molecule has moment of inertia I. By Bohr’s quantization condition its rotational energy in the nth level (n = 0 is not allowed) is(a) 1/n2 (h2/8π2I) (b) 1/n (h2/8π2I)(c) n (h2/8π2I)(d) n2 (h2/8π2I) |
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Answer» Correct Answer is: (d) n2 (h2/8π2I) α = nh/2π, Rotational KE = α2/2I = (nh/2π)2 1/2I = n2 (h2 / 8π2I) |
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| 45. |
When liquid medicine of density ρ is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.After the drop detaches, its surface energy is(a) 1.4 x 10-6 J(b) 2.7 x 10-6 J(c) 5.4 x 10-6 J(d) 801 x 10-6 J |
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Answer» Correct Answer is: (b) 2.7 x 10-6 J Surface energy = 4πR2T. |
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| 46. |
When liquid medicine of density ρ is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.If r = 5 x 10-4 m,ρ = 103 Kg m-3 , g = 10 m s-2, T = 0.11 N m-1,the radius of the drop when it detaches from the dropper is approximately(a) 1.4 x 10-3 m(b) 3.3 x 10-3 m(c) 2.0 x 10-3 m(d) 4.1 x 10-3 m |
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Answer» Correct Answer is: (a) 1.4 x 10-3 m 2πr2T/R = mg = (4/3 πR3) ρg. |
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| 47. |
A block of mass M slides on a frictionless surface with an initial speed of `v_(0)` On top of block is a small box of mass m. the coefficients of friction between box and block are `mu_(6) and mu_(k)`. The sliding block encounters and ideal spring with force constant K. Answer following questions. What is maximum value of k for which it remains true that box does not slide? A. `((mu_(s)g)/v_(0))^(2) M/((M+m))`B. `((mu_(s)g)/v_(0))^(2)(M+m)`C. `((mu_(s)g)/(2v_(0)))^(2) (M+m)^(2)/M`D. None of these |
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Answer» Correct Answer - B `1/2(M+m)v_(0)^(2)=1/2kx_(m)^(2)` `kx_(m)=mu_(s)(M+m)g` `x_(m)=mu_(s)//k` `1/2(M+m)u_(0)^(2)=1/2k(((M+m)mu_(s)g)/k)^(2)` `k=((mu_(s)g)/v_(0))^(2)(M+m)` |
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| 48. |
How is the oxygen content monitored in blood?(a) By Korotkoff Sounds(b) By Pulse Oximetry(c) By Fluorescence(d) By luminescence |
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Answer» Correct answer is (b) By Pulse Oximetry Best explanation: Pulse Oximetry is used to measure the oxygen saturation of the blood. In this process, light a light and a detector is used. It is normally in a band or a clip with the light source and the detector at the opposite ends. The light is projected at the finger and it is detected on the nail side. The light has an absorbance ratio which determines the amount of oxygen that is present in the blood. |
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| 49. |
Digestion of fats begins in _______(a) Mouth(b) Esophagus(c) Stomach(d) Duodenum |
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Answer» The correct choice is (d) Duodenum For explanation: Fats are in the form of large globules and so because of their small surface area, they cannot be digested easily. When the food in the form of chyme enters the duodenum of the small intestine, it comes in contact with the bile salts which break fat into smaller globules. The pancreatic juices contain enzymes for the digestion of fats. |
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| 50. |
Which of the following relations are true?(a) γ increases, penetration of sound increases, resolution decreases(b) γ increases, penetration of sound decreases, resolution decreases(c) γ increases, penetration of sound decreases, resolution increases(d) γ decreases, penetration of sound increases, resolution increases |
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Answer» Correct choice is (a) γ increases, penetration of sound increases, resolution decreases The best I can explain: When the frequency (γ) of the sound waves increases, it gains more energy to overcome the impedance barrier and so is able to penetrate deeper. However, the penetration may not be uniform in all places and reflection may be uneven thus it affects the resolution of the image. |
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