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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. |
9What is power?Ans. Po |
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Answer» It is the ability or capacity to do something or act in a particular way. thanks |
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| 2. |
The refractive indices of flint glass for blue and red colours an1.664 and 1.644. Calculate its dispersive power.|Ans. 0.0305] |
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| 3. |
Give the refractive indices of Rock Salt, Air, Hydrogen,Water.64. |
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| 4. |
HOTS A bridge is 500 m long. A 100 m longtrain crosses the bridge at a speed of30 m/s. Find the time taken by train tocross it. |
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Answer» time taken = distance / speed = (500+100)/30 =20 sec |
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| 5. |
cted vertically upwards. Ift, and t, be the times at which itis at height h above the point2.4 A body is1Supwarsro..boty sthre--u(D)4gtof projection while·ande ascending and descending respectively, then h is(A) gt,t,/2(B) g1t(C) 2gt/t, |
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Answer» Thank you |
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| 6. |
The atom of an element X has 7 electrons in its M shella. Write the electronic configuration of elements X.b. What is the atomic number of element X?c. Name the element X. Is it metal or non-metal? |
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| 7. |
The atom of an element X has 7 electrons in its M shella. Write the electronic configuration of elements X.b.What is the atomic number of element X?Name the element X. Is it metal or non-metal?C. |
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Answer» tysm😇 |
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| 8. |
1.A train 50 m long passes over a bridge at a velocity of 30km/h. If it takes 36 s to cross the bridge, then the length ofthe bridge will be: |
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Answer» थैंक्स कल्या पांडेय |
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| 9. |
ery short answers to the following questions.me the microbe that causesfoot and mouth disease in cattle.food poisoning in humans.6 x 2metal reacts vigorously with water to produce Y gas which burns with thed. Identify X and Y.human activities the only reason of the extinction of some plants and animals? Awrite your comments on it.ict the consequences in the following situations.Auditory nerve gets damaged.Persistence of hearing does not exist.fy the tool in Figure 1. Explain briefly how it works.is nitrogen fixation?Figure 1 |
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Answer» make a proper picture.. |
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| 10. |
A force of 1000 N is applied to a 1200 kg car. If the coefficient of rolling friction is 0.04, what is the acceleration of the car? |
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| 11. |
5. The length of a rod is (11.05± 0.2) cm. What is the length ofthe two rods?(a) (22.1 +0.05) cm(c) (22.10t 0.05) cm(b) (22.1t 0.1) cm(d) (22.10± 0.2) cm |
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Answer» 2×(11.05+_0.05)=22.10+_0.10 cm I did not understand |
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| 12. |
Why are metal rods used as lightningconductors or rods?7. |
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Answer» Ans :- Alightning rodis very simple -- it's a pointedmetal rodattached to the roof of a building. It is better stated to say that lightning rodsprovide a low-resistance path to ground that can beusedto conduct the enormous electrical currents when lightningstrikes occur. |
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| 13. |
Q2. The centripetal force acting on a particle in U.C.M. is proportional to ...a)T? b) 1/T2 c) 1/F2 do |
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Answer» c) 1/F2 is the correct answer |
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| 14. |
36.Three identical thin rods each of length / and mass M are joined together to form a letter H. What is themoment of inertia of the system about one of the sides of HMiΒ) ΜΙΣMi24A)o 2uD)2MID) 4112hout their own axis, the moment |
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Answer» D. 4MI^2/3 |
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| 15. |
56. Two identical uniform rods AB and CD, each of length L metre arejoined to form a T-shaped frame.Find the centre of mass of theframe. The centre of mass of theuniform rods are at their middlepoint.Ans. At a distance L/4 fromC on the rod CD. |
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| 16. |
27.A water jet, whose cross sectional are is 'a' strikes awall making an angle '0' with the normal andrebounds elastically. The velocity of water of density'd' is v. Force exerted on wall is(1) 2 av'd cos0(3) 2 avd cos0(2) 2 av'd sin0(4) avd cos0 |
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Answer» assume density as rho , for this solution |
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| 17. |
Four thin uniform rods each of length L and massm are joined to form a square. The moment ofinertia of square about an axis along its onediagonal is2mL623(2) m3 mL244 mL3 |
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Answer» We have to use the theorem of parallel axes:I = ICM+Ma2whereICMis the the moment ofinertiaabout an axis through the centre of mass of the rod andIis the moment ofinertiaabout a parallel axis at distancea. The moment ofinertiaof a thin rod of massMand lengthLabout an axis through the mid point of the rod and perpendicular to its length isML2/12. The moment ofinertiaof the rod about a parallel axis at a distanceL/2 (which is the distance of the centre of the frame from each ro.isML2/12 +M(L/2)2=ML2/3 You must remember that moment ofinertiais a scalar quantity. Since there arefourrods in the square frame, the moment ofinertiaof the entire frame is four times the moment ofinertiaof one rod. Therefore Moment of inertia of one partis(4/3)ML2. But diagonals are also mutually perpendicular. Hence ID+ ID= (4/3) ML^2 Hence ID= (2/3) ML^2 |
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| 18. |
At what separation should two equal charges, 10 C each,he placed so that the force between them equals theweight of a 50 kg person? |
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Answer» Given:Magnitude of charges, q1 = q2 = 1 CElectrostatic force between them, F = Weight of a 50 kg person = mg = 50 × 9.8 = 490 NLet the required distance be r.By Coulomb's Law, electrostatic force, F=14πε0q1q2r2⇒490=9×109×1×1r2⇒r2=9×109490 ⇒r=√949×108=37×104 m = 4.3×103 m |
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| 19. |
11. (a) What are quantum numbers? Explain their significance. |
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Answer» A quantum number is a value that is used when describing the energy levels available to atoms and molecule.The three quantum numbers describe the shape,size and orientation of the atomic orbital in |
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| 20. |
Which one of the following sets of quantum numbersrepresents an impossible arrangement(1986)(a) 3(b) 4(c) 3200(d) 5 |
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Answer» (c) is wrong statement because |m| cannot be greater than l. c because there is L= 2 then -3 is not possible |
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| 21. |
A man does 60 J of work in 6 seconds. Calculate the power. |
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Answer» power is work done/timehence power will.be 60/6=10watt wrong |
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| 22. |
A particle has an initial velocity of 3i + 4] and an accel-eration of 0.4i+ 0.3j Its speed after 10sec isa) 10 unit b) 7unit c) 7./2 unitd) 8.5 unit. |
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| 23. |
a body of mass 60kg is pulled with 20N force to a distance of 8m in 10sec calculate power |
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Answer» w= F × s=240×8=1920 Jp=w/t=1920/10=192 W |
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| 24. |
to.1s. A load of 100 kg is pulled up by 5 m. Calculate the work done.( |
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| 25. |
A load of 100 kg is pulled up by 5 m. Calculate the work done. (g =9.8 m/s^2) |
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Answer» given that , m = 100kg height(h) = 5 m g = 9.8 m/s W = ?W = mgh = 100 * 9.8 * 5 = 4900 Joules . |
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| 26. |
What is the power of an engine which supplies 18 kJ of energy per minute?a) 250 Wb) 245 Wc) 255 Wd) 300 W |
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| 27. |
.44A small block of mass m is kept on a roughinclined surface of inclination θ fixed in anelevator. The elevator goes up with a unifornmvelocity v and the block does not slide on thewedge. The work done by the force of friction onthe block in time t will be- |
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| 28. |
1. The equation of given graph is as y = A sinat. The area shaded in curve is+ y(1) Zero(2) 2A |
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Answer» 2a/π is a right answer |
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| 29. |
A motorthrough 25 m.with electrical input of 30 kJ is used to drivea crane winch. The winch raises a 100 kg beamThe efficiency of the winch is(1) 78.2%2) 83.3%(3) 87.5%4)75.67%. |
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| 30. |
ss A load of 220 kg is vertically pulled up by a crane through a vertical height of 16 m in40 s the horse power of engine pulling the rope isa) 0.29b) 625c) 1.18d) 0.83 |
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| 31. |
Which of the following is moving faster?Justify your answer.1.A scooter is moving with a speed of 300 meter per minute. 2.A car moving with a speed of 36km/h |
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Answer» A scooter is moving faster because when we calculate 36km/h into seconds than scooter is faster. the scooter with speed 300m/s is moving fastbecause it we convert the car speed into m/s the value is 10let me shiw you the calculation 1km=1000m36km/h=36×1000/3600=10m/s a car is right answer 1. scooter is the correct answer car is right answer to |
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| 32. |
An engine is moving with a velocity 44 m/s.After applying the brakes, it stops aftercovering a distance of 121 m. Calculateretardation and time taken by the engine tostop. |
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| 33. |
8.The work done by a force 7=2i+2j around the pathshown in figure isyBla, a)(0, a)(0,0)(a,0)2a(1)(2) a40przero(4) 3 |
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Answer» option, 3 is the right answer zero vector around of this picture and solve see the picture 3 is the best answer Work done is 0 since three was no displacement. zero is the right answer option 3 is the right answer option 3 is the right answer option 3 is the right answer zero is the righg answrr a³ is the right answrr..... option 3 is the right answer a³ is the right answers..... Work done is zero because there is no displacement 3 is the correct answer |
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| 34. |
19. Let x and a stand for distance. Isdxa sin4 dimensionally correct ? |
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| 35. |
s displacement a scalar quantity |
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| 36. |
) Is displacement a scalar quantity? |
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Answer» no displacement is a vector quantity |
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| 37. |
Is displacement a scalar quantity ? |
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Answer» Displacement is a vector quantity and not a scalar quantity bacause it can be only described by using both magnitude as wall as direction |
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| 38. |
whay is scalar quantity |
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Answer» Scalarsarequantitiesthat are fully described by a magnitude (or numerical value) alone.Some examples of scalar quantitiesinclude speed, volume, mass, temperature, power, energy, and time. sorry I didn't know Thequantityis either a vector or ascalar. These two categories can be distinguished from one another by their distinct definitions:Scalarsarequantitiesthat are fully described by a magnitude (or numerical value) alone. Vectors arequantitiesthat are fully described by both a magnitude and a direction. A scalar quantity inn physics is a physical quantity that can be described by a single element of a number field such as areal number often accompained by units of measurement. a scalar is usually said to bea physical quantity that only had a magnitude Scalar quantities have only magnitude and do not have direction. |
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| 39. |
numpnnng pperaionbe sufhicient iaadve a reasonabiea uid velecty |
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Answer» Please post clear image |
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| 40. |
what is scalar product |
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Answer» mathematics, the dot product or scalar product is an algebraic operation that takes two equal-length sequences of numbers and returns a single number. Geometrically, it is the product of the Euclidean magnitudes of the two vectors and the cosine of the angle between them. Like my answer if you find it useful! |
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| 41. |
prove that:-scalar product is distributive |
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| 42. |
tant 10) Derive the expression for scalar product of tvectors in terms of their scalar components. |
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| 43. |
9. The sum and difference of two vectors A and B arA-B=4+ 2j-11k^A+B=21 + 61 + k andFind the magnitude of each vector and their scalarproduct A. B.(Ans. 50, 41, -25) |
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| 44. |
\left. \begin{array} { l } { \vec { A } \cdot \vec { B } = \vec { B } \cdot \vec { A } } \\ { \vec { C } \cdot \vec { A } + \vec { B } ) = \vec { C } \cdot ( \vec { B } + \vec { A } ) } \\ { \vec { A } \times \vec { B } = \vec { B } \times \vec { A } } \\ { \vec { A } \times ( \vec { B } + \vec { C } ) = ( \vec { A } \times \vec { B } ) + ( \vec { A } \times \vec { C } ) } \end{array} \right. |
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Answer» Option 3 is not correct as when we interchange the vectors in cross multiplication the direction of resultant changes |
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| 45. |
\vec{A}=3 \vec{i}+2 \vec{j}+2 \vec{k}, \vec{B}=\vec{i}-\vec{j}+2 \vec{k}, \text { find } \vec{A} \cdot \vec{B} |
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Answer» A.B= (3.1)+(2.(-1))+(2.2)= 3-2+4= 5 |
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| 46. |
\vec { A } = 2 \vec { i } + 3 \vec { j } + 4 \vec { k } \text { and } \vec { B } = 4 \vec { i } + 3 \vec { j } + 2 \vec { k } , \text { find } \vec { A } \times \vec { B } |
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| 47. |
\begin{array}{l}{\text { prove that-scalar product is distributive }} \\ {\vec{A} \cdot(\vec{B}+\vec{C})=\vec{A} \cdot \vec{B}+\vec{A} \cdot \vec{C}}\end{array} |
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| 48. |
rticle executes simple harmonic motion between x-=-A and xand to go from A/2 to A is T2 Then+A . The tirme taken for it to gotaken for it to go from 0 to A/2 is T,(B) T T(C)T,(D)T,=27, |
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| 49. |
56. Aparticle executes simple harmonic oscillation with an araplitude a. The period of oscillation is T.THetime taken by the particle to travel half of the amplitude from the equilibrium positon isAIPMT 2007(A) T/8(B) T/12(C) T/2(D) T/4 |
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| 50. |
)one67. A 200 g sample of hard water is passed through the column of cation exchange resin, in which Ht is exchanged by Ca"*The outlet water of column required 50 mL of 0.1 M NaOH for complete neutralization. What is the hardness of Ca2 ion inppm(1) 250 ppm(2) 500 ppm(3) 750 ppm(4) 1000 ppm |
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Answer» N1 x v1 = n2 x v2 Thus, 0.1 x 50 = n2 x 200 Thus n2 (normality) of hard water is 0.025 Normality x equivalent wt = gms/lt. I. e. 0.025 x 20 (equipment wt of CA) =0.5 g/L or 500 ppm as Ca or 500 x 50/20 = 1250 ppm as CaCO3 |
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