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InterviewSolution
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.
| 8001. |
EXAMPLE 2.23: The velocity-time graph of a ball of mass 20 g movingalong a stralght line on a long table is given in the adjoining figure. 2How-múch force does the table exert on the ball to bring it to rest?20INCERT Solved Example, CCE 2011]SOLUTION: From the given graph, we observe that the initial velocity of theball, u = 20 cm s-1 = 0.20 m s-1, final velocity of the ball, v = 0 after a time,10-r 10 s. As the velocity-time graph is a straight line, the ball is slowing downwith a constant negative acceleration having a value→Time is)Fig. 2.29v-u0-0.20100.02 m s2ma and mass of the ball, m: 20g # 002 kgForce exerted on the ball, FForce, F ma- 0.02 x (-0.0 |
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Answer» Why r u posting answers along questions ? Answers are already there |
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| 8002. |
14. A bullet, on penetrating two successive wooden planks ofunequal thickness, loses its velocity by 200 m s-1 in eachcase. If the initial velocity of the bullet is 1000 m s-1, calcu-late the ratio of thickness of the planks.Ans. 9:7 |
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| 8003. |
25. A stone is thrown vertically upward with a speed of28 m/s. (a) Find the maximum height reached by thestone. (b) Find its velocity one second before it reachesthe maximum height. (c) Does the answer of part(b) change if the initial speed is more than 28 m/s such3as 40 m/s or 80 m/s?a ton of a tall building is dropping |
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| 8004. |
46. A stone is dropped into a well of 20m deep. Anotherstone is thrown downward with velocity 'y' one secondlater. If both stones reach the water surface in the wellsimultaneously, v is equal to (g=10ms-2)1) 30ms-' 2) 15ms 3) 20ms-1 4) 10ms-1 |
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| 8005. |
a. Mendeleev's periodic law. |
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Answer» when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." In 1869,Dmitri MendeleevandLothar Meyerindividually came up with their own periodic law "when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically."Meyer based his laws on the atomic volume (the atomic mass of an element divided by the density of its solid form), this property is calledMolar volume. |
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| 8006. |
An object is projected from ground with speed u aangle θ with horizontal, the radius of curvature ofits trajectory at maximum height from ground isu2 cos2 θ9u2 sin2 θsin 22u" sin2 θ(4) 2g |
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| 8007. |
36. A ball is hit by a batsman at an angle of 37° asshown in figure. The man standing at P shouldrun at what minimum velocity so that hecatches the ball before it strikes the ground.Assume that height of man is negligible incomparison to maximum height of projectile.u=15ms-37.manDCA9m(A) 3 ms-t (B) 5 ms-'(C) 9 ms-t (D) 12 ms -1 |
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Answer» (B) 5 ms—¹ is correct answer bis the correct answer of your questions 5ms is the correct answer then I will like your answer Ans is 5m per second |
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| 8008. |
5. A stone is thrown vertically upward with a speed of8 m/s. (a) Find the maximum height reached by thestone. (b) Find its velocity one second before it reachesthe maximum height. (c) Does the answer of part(b) change if the initial speed is more than 28 m/s suchas 0 m/s or 80 m/s ? |
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| 8009. |
25. A stone is thrown vertically upward with a speed of28 m/s. (a) Find the maximum height reached by thestone. (b) Find its velocity one second before it reachesthe maximum height. (c) Does the answer of part(b) change if the initial speed is more than 28 m/s suchas 40 m/s or 80 m/s? |
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| 8010. |
and both of heil Ilae Ju(8) Illustrate Newlands' law of octaves with a peri) Newlands' law of octaves states that tablsuitable example. |
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Answer» Law of octaves, inchemistry, the generalization made by the English chemist J.A.R.Newlands in 1865 that, if the chemical elements are arranged according to increasingatomic weight, those with similar physical and chemical properties occur after each interval of seven elements. Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law. In Newlands' table of elements, if we start with hydrogen and move down and then start at the top the eight element is Fluorine and next eigth element is Chlorine and so on. The properties of hysrogen, fluroine and chlorine are similar. if you start at lithium, then eigth element is sodium and next coming eigth element is potassium and so on. These elements show similar physical and chemical properties Please hit the like button if this helped you. |
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| 8011. |
11.Whenabodyof mass 'm' is dropped from someheight 'h'. How total energy is conserved at top,midway and when the hody is reached at thebottom of the ground? |
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Answer» total energy=m*g*h-> mass*weight*height... I can't understand your answer. Please explain. Let the work done on the object against gravity = W Work done, W = force ×displacement ->Work done, W = mg×h -> Work done, W = mgh Since workdone on the object is equal to mgh, an energy equal to mgh units is gained by the object . |
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| 8012. |
30. The equation of trajectory of a projectile isx* (in metre). The maximum height9)reached is(1) 45 nm(3) 18 m(2) 36 m(4) 90 m |
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| 8013. |
21. A particle is projected vertically up with velocityfrom earth surface. The velocity ofparticle at height equal to half of the maximum4gRheight reached by itgRegR(2) 32gR |
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| 8014. |
Force acting on a particle moving in a straight line varies with the velocity v of the particle asF-, where K is a constant. The work done by this force in time t is2Kt(A)t(B) 2Kt(C) Ktv2 |
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Answer» option D |
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| 8015. |
For an object thrown at 45° to horizontal, themaximum height (H) and horizontal range (R)are related as :-(1) R = 16H(2) R = 8H(3) R = 4H (4) R = 2H |
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Answer» answer is optio no. (4) but method??? |
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| 8016. |
4. Write perfect gas equation? |
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Answer» PV = nRT where P is pressure, V is Volume ,n is number of moles , T is absolute temperature and R is Universal Gas Constant |
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| 8017. |
BRI RI b & (I Bhjidh] 7 |
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Answer» Ans :- शरीर में कैल्शियम का निर्माण होता है। इसके अभाव में हड्डी कमजोर होती हैं। कैल्शियम के स्तर को नियंत्रित करता है। घुलनशील प्रो-हार्मोन का एक समूह होता है। विटामिन डी की मदद से शरीर में कैल्शियम का निर्माण होता है और कैल्शियम हड्डियों की मजबूती के लिए आवश्यक होता है। इसके अभाव में हड्डी कमजोर होती हैं व टूट भी सकती हैं, साथ ही इसके अभाव से हड्डियों की नरमाई बढ़ जाती है। विटामिन डी की कमी से बच्चों में रिकेट्स का खतरा बढ़ जाता है। विटामिन डी का स्तर अधिक होने पर शरीर के विभिन्न अंगों- जैसे गुर्दों, हृदय, रक्त वाहिकाओं और अन्य स्थानों में पथरी हो सकती है। विटामिन डी शरीर में कैल्शियम के स्तर को भी नियंत्रित करता है। आइए जानें विटामिन डी क्या हैं। PLEASE LIKE THE ANSWER |
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| 8018. |
2. Number of signifivant figures in 0.0006702 isRi g02 |
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Answer» The number of significant figures is 4 |
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| 8019. |
0.28A ball is dropped vertically from a height d above the ground. It hits the ground and bounces upvertically to a height 2. Neglecting subsequent motion and air resistance, its velocity v varies with theheighth above the ground is(A)h(B)(0)(D)d |
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Answer» Option B is the the answer as ball will be attaracting towards positive |
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| 8020. |
5. A stone is thrown at an angle 0 to the lhorizontal reaches a maximum height H. Then the time of flight of stone willbe:2HD2D) V neA)StT |
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Answer» Answer is (B) |
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| 8021. |
In the figure shown a ring A in roling without slicing with a volocity v on the horizontal surfaco of thebody B (of samo mass as A) All surfaces are smooth B has no initial velocity What will be themaximum height (from initial position) reached by A on Bamooth serfaco3 v1 92 93 04 g |
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| 8022. |
Use the mirror equation to show that an objectplaced between f and 2f of a concave mirrorproduces a real image beyond 2f. All India 2015 |
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| 8023. |
Q20. Use the mirror equation to show that an object placed between f and 2f of a concave mirrorproduces a real image beyond 2f(delhi 2015) |
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| 8024. |
Establish concave mirror equation. |
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Answer» see ur text book What the _ _ _ _? |
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| 8025. |
+4. The electric field in a region is given by E=3i.Write the SI unit for A. Write an expression for thepotential in the region assuming the potential atinfinity to be zero.| Ans. NmÂşc! A272)5. Figume 273 shoum |
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| 8026. |
6. 10 N का एक बल एक वस्तु को 20 criX से विस्थापित करता है और इस प्रक्रिया में 1Jका कार्य किया जाता है। बल एवं विस्थापन ।के बीच कोण है ।।(9 60°(b) 45°| (c) 30°।|(d) 90° |
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Answer» W = Fds cos theta1= 10*0.2 mcos theta1/2= cos thetacos60° = cos thetatheta= 60°Opti on A 10n Thailand all all fantastic 86 jhhggggg |
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| 8027. |
it nuWrite its SI unitdy Given the components of an electric field as A, ,E,0 and E,0, where a is adimensional constant. Calculate the flux through each lace of the cube of side a: as shownin the ligure, and the effective charge inside the cubeAn electric dinole iu hal |
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| 8028. |
Q82. State Gauss's law in electrostatics. A cubewith each side 'a' is kept in an electric field givenby E-Cri, (as is shown in the figure) where C isa position dimensional constant. Find out |
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| 8029. |
The half-life of radium is 1622 years. How long will it take forgiven amount of radium to decayths of a5.motod |
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Answer» Like my answer if you find it useful! |
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| 8030. |
A 3 Q resistor having 2 A current will dissipate the power of |
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Answer» Power=I^2R=2*2*3=12watt |
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| 8031. |
UnitComplete the table properlyComponent Measuring devicepotentialdifferencejoule/coulombammeterampere |
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Answer» the measuring device for potential difference is voltmeter |
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| 8032. |
37. A 3 Q resistor having 2 A current will dissipate the power ofa) 2 watts(b) 4 watts(c) 6 watts(d) 8 watts |
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Answer» Power=I^2R=2*2*3=12Watt The options mentioned are wrong |
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| 8033. |
JUUN21.A bullet is fired into wood. The bullet penetrates for 7s to come to rest. Find thedistance travelled by the bullet in the wood if the retardation offered by thewood is 0.4m/s2a) 2.8mb) 6.8mc) 5.6md) 9.8m |
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Answer» v=u-atu=v+at =0+0.4*7 =2.8m/ss=ut-1/2at^2 2.8*7-1/2*0.4*7^2 19.6-0.2*49 19.6-9.8 9.8m |
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| 8034. |
Q.14A self propelled vehicle of mass m whoseengine delivers constant power P has anacceleration a =-- (assume that there isno friction). In order to increase its velocity fromv1 to v2, the distance it has to travel will bemv |
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Answer» thanks |
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| 8035. |
A particle of mass m is driven by a machine thatdelivers a constant power k watts. If the particlestarts from rest the force on the particle at timet is5.(1) Vinkt(2) 2mk t /2 |
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| 8036. |
22. Explain how the human ear works. |
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| 8037. |
ultrasound22. Explain how the human ear works |
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| 8038. |
LSC ELASCO5. The electric field at the origin is along the positivex-axis. A small circle is drawn with the centre at theorigin cutting the axes at points A, B, C and D havingcoordinates (a,0), (0, a),(a,0), (0, -a) respectively.Out of the points on the periphery of the circle, thepotential is minimum at(a) A(b) В(c) C(d) D. |
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| 8039. |
5. The electric field at the origin is along the positivex-axis. A small circle is drawn with the centre at theorigin cutting the axes at points A, B, C and D havingcoordinates (a,0), (0, a),(a,0), (0, -a) respectively.Out of the points on the periphery of the circle, thepotential is minimum at(a) A(b) B(c) C(d) D. |
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| 8040. |
lotr Draw the diagram of human ear? or da:s8 |
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Answer» thank you do you have any same colour diagram |
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| 8041. |
The diameter of a brass rod is 4 mm and Young'smodulus of brass is 9 10'0 N/m". The forcerequired to stretch by 0.1% of its length is :-(1) 360π Ν(2) 36 N(3) 144π × 1^3, N(4) 36π × 10^5 N |
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| 8042. |
Example 13. Two charges are placed on the x-axis,a charge of + 3 uC at x = 0 and a charge of - 5 uC atx = 0.40 m [Fig. 1.14]. Where must a third charge q beplaced if the force it experiences is to be zero ?a bo poor that a |
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| 8043. |
The susceptibility of magnesium at 300 K is 1.2x10. Whatwill be its susceptibility at 200 K? |
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| 8044. |
23. The susceptibility of magnetism at 300 K is1.2 x 103. At what temperature will thesusceptibility become equal to 1.44 x 10*. 3 |
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Answer» X = C/T = >x1/x2 = T2/T1 => (1.2 x 10-5)/(1.8 x 10-5) = T2/300 => T2 = 12/18 x 300 = 200K |
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| 8045. |
*Example 16The susceptibility of magnesium at 300 K is1.2 x 103. At what temperature will thesusceptibility increase to 1.8 x 10 IJuly 16 |
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| 8046. |
A man moves on a straight path. He travels total distanceI. He travels half of his journey with speed 10 ms . Theremaining párt of journey was covered by him with speed20 m s for half of remaining time and with velocity40 m s for other half of remaining time. The averagespeed is6.70(a) 15 m s(c) 60 m s(b) ms(d) 10 ms |
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Answer» let the total distance be dFor the first half distance, time taken = distance/speed = (d/2) / 10 = d/20 …..(1) For the second half distance, first half time, speed = 20m/s second half time, velocity = 40m/sdistance covered = speed*time d/2 = 20*t/2 + 40*t/2 = 30t d = 60t average speed =total distance/ total time= d/(t1 + t) d/(d/20 + d/60) = 15m/sThus, average speed is 15m/s (a) is correct option |
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| 8047. |
A man moves on a straight path. He travels total distance1. He travels half of his journey with speed 10 ms Theremaining part ofjourney was covered by him with speed20 m s1 for half of remaining time and with velocity40 m s1 for other half of remaining time. The averagespeed is(al 15 m s16.14l. He travels half of his journey with speed 10 ms1. The70 |
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Answer» Like if you find it useful |
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| 8048. |
R PRACTICE(5)The susceptibility of annealed iron at saturationis 5500. Find the permeability of annealed ironat saturation(Ans. :69 x10) |
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| 8049. |
(0.14. Convert all in meters (m)(i) 5 m(ii) 3 km(iii) 20mm- |
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| 8050. |
Distinguish between diamagnetic and paramagnetic substance. |
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Answer» Ans :- Paramagnetic materialsare attracted by external magnetic fields whereas diamagnetic materialsare repelled. Paramagnetic materialshave at least one unpaired electron in the system, but diamagnetic materialshave all their electrons paired. PLEASE LIKE THE ANSWER DIAMAGNETIC substance :These substance which are weakly repelled by external magnetic field are called diamagnetic . Example -Tio2 ,Nacl etc PARAMAGNETIC substance These substance which are attracted by the external magnetic field is called paramagnetic . Example - O2 , cu2+ ,fe3+ , etc |
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