InterviewSolution
Saved Bookmarks
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.
| 13301. |
line, if the maximum permisible current is 5A only?Try(11)Calulate the anergy transferred in kWh by a SA current flowinaa resistance of 22 for 40 minutes.urrent flowing through(0.033 |
|
Answer» he bro please like my answer because I am of 9 th class |
|
| 13302. |
15.The capacity of a storage cell 155 ampere hour. The maximum currentit can supply for 10 hours is(A) 5 A(B) 0.5 A(C) 50 A(D) 0.25 A |
|
Answer» Capacity for a hour =5Capacity for 10 hours =5×10 =50 A |
|
| 13303. |
An old man goes for morning wu'k on asemicircular track of radius 40 m ; if hestarts from one end of the track and reachesto other end, the distance covered by theman and his displacement will respectivelybe-(A) 126 m, 80 m (B) 80 m, 126 m(C) 80 m, 252 m(D) 252 m, 80 m |
| Answer» | |
| 13304. |
13)2Ί2Ί8Each of the resistance shown in the diagram dissipates energy and can withstand a maximun powerf 18W without melting. Find the maximum current that can flow through the resistors |
|
Answer» P = I^2R18 = i^2(3ohm)( after calculating equivalent. resistance)i^2=6 I= √6in resistance A B and C current will be same |
|
| 13305. |
|()।26. Two electric bulbs hactric bulbs have tungsten filament of same length.ves 60 watt and the other 100 watt, then:।26, दो बिजली के बल्चों केहैं। यदि उनके बीच एक(a) !(0) वाट वाले व(b) 50 वाट वाले बत(C) दोनों फिलामेंट -(d) जब तक लंबाईअसंभव है।If one of them gives 60 watt and the other 100(a) 100 watt bulb has thicker filament(b) 60 watt bulb has thicker filamentboth filaments are of the same thickness1) it is impossible to get different wattage unless thelengths are different.८ |
|
Answer» Power is directly proportional to resistance and resistance is inversely proportional to thickness.Thick wire has less resistance and hence more power.100 watt bulb has thicker filament. |
|
| 13306. |
34. How would you arrange 80 similar cells eachhaving e.m.f. of 1.1 V and internal resistance 0.2ohm so as to send maximum current through anexternal resistance of 0.64 ohm ?[Ans. n = 16, m = 51 |
| Answer» | |
| 13307. |
Two resistance coils of resistances 4 Ohm &8 Ohm are connected in parallel. To this parallelcombination, another resistance coil of 7/3 Ohm is connected in series. The entirecombination is connected across a cell of emf 3V and internal resistance 1 Ohm. Calculatethe current through each resistance coils. |
| Answer» | |
| 13308. |
Find the value of current i" indicated in followingcircuit?10 ΩWw10Ω5Ω10 Volt |
| Answer» | |
| 13309. |
14. 10 cells each of e.m.f. 2 volt and each can deliver a maximum currentof 2 amp are connected in parallel. What is the total e.m.f. of theircombination ?Ans. 2 volt. |
|
Answer» As we know that, in parallel combination of the resistors or capacitors the potential difference across any capacitor or resistor remains same and will be equal to the effective emf or voltage the combination Hence, EMF of each capacitor is equal to the total potential difference across the combination. |
|
| 13310. |
When three identical bulbs of 60 watt, 200 voltrating are connected in series to a 200 voltsupply, the power drawn by them will bea), 20 watt49.(b) 60 watt(d) 10 watt(2004)180 watt |
|
Answer» 1/p= 1/p+1/p+1/p=3/pas P is 60 so consumed power= 60/3= 20 but bulbs are connected in series ?? |
|
| 13311. |
A solenoid of 10 henry inductance and 2 ohmresistance, is connected to a 10 volt battery. In howmuch time the magnetic energy will be reaches to1/4 th of the maximum value? |
| Answer» | |
| 13312. |
Asphere of mass m movingwith a constant velocitycollides with another stationary sphere of samemass. The ratio of velocities of two spheres aftercollision will be, if the co-efficient of restitution is e-37.1-е1+ee+1e+1(4) e-i(3) 1-е |
|
Answer» option (1) is correct. |
|
| 13313. |
A particle moves along a semicircle of radius 10m in 5seconds. The average velocity of the particle isd-(a) 2Ď ms-1(c) 2 ms-1[Kerala (Engg-) 2001]-(b) 4Ď ms-1(d) 4 ms-1bi home to a mark |
| Answer» | |
| 13314. |
if a potential difference of a 10 volt causes a current of 2 ampere to follow for a 1 minute how much energy is transferred |
|
Answer» Voltage=10volt current=2 ampere time = 1minute = 60seconds heat energy= VIT = 10*2*60=1200 joules |
|
| 13315. |
20. A man goes 10m towards North, then 20m towards east then displacement isA) 22.5 mB) 25 mC) 25.5 mD) 30 m |
|
Answer» option 1 |
|
| 13316. |
20. A man goes 10m towards North, then 20rm towards eas then displacement isA) 22.6 mB) 25 mC) 25.5 mD) 30 m |
|
Answer» option A |
|
| 13317. |
The coordinates of the midpoints of the sides of a triangle ABC are D(2, 1), E(5, 3) and F(3,7)Equation of median of the triangle ABC passing through F is(A) 10x + y-37=o(B) x + y-10=0(C) x-10y + 67= 0(D) none of these |
|
Answer» Let the vertices be A(x1, y1), B(x2, y2) and C(x3, y3) Let D, E, and F be the midpoints of AB, BC and AC respectively. D(2, 1), E(5, 3) and F (3, 7) x1 + x2 = 4 and y1 + y2 = 2 x2 + x3 = 10 and y2 + y3 = 6 x3 + x1 = 6 and y1 + y3 = 14 x3 = 6 - x1 and x2 = 4 - x1 6 - x1 + 4 - x1 = 10 or x1 = 0 x2 = 4 and x3 = 6 y2 = 2 - y1 and y3 = 14 - y1 16 - 2y1 = 6 or y1 = 5 y2 = - 3 and y3 = 9 Therefore, the co-ordinates are (0, 5), (4, - 3) and (6, 9) Equation of AB: (y - 5) = (-3 - 5)/(4 - 0)[x - 0] Or, 4y - 20 = - 8x Or, y + 2x = 5 Equation of BC: (y - 9) = (- 3 - 9)/(4 - 6)[ x - 4] Or, 18 - 2y = - 12x + 48 Or, 6x - y = 15 Equation of AC: (y - 5) = (9 - 5)/(6 - 0)[x - 0] Or, 6y - 30 = 4x Or, 2x + 3y = 15 wrong answer |
|
| 13318. |
The earth's mass is 80 times that of moon and theirdiametres are in ratio 4 1 respectively. What is thevalue of g moon (g' on earth 9.8 ms |
| Answer» | |
| 13319. |
A car travels a certain distance with a speed of 40m/sand returns with a speed u. The average speed u. Theaverage speed for the whole tourney is 45 ns . whatis the value of u?(a) 60ms(b) 70ms1(d) 80ms1ins(c)51.4 msnis |
|
Answer» hit like if you find it useful how t1= D/u0 |
|
| 13320. |
23. If the charge on an electron is 1.6 x 10-19 coulombs, how many electrons should pass through a conductor in1 second to constitute 1 ampere current ?1and lichthon |
| Answer» | |
| 13321. |
The image of the candle flame placed at a distance of 40 cm from a spherical lens is formed on ascreen placed on the other side of the lens at a distance of 40 cm from a lens. Identify the type of lensand write its focal length. What will be the nature of the image formed if the candle flame is shifted 25cm towards the lens? Draw ray diagram.(f 20 cm) |
| Answer» | |
| 13322. |
1. How many electrons pass through a lamp in oneminute if the current is 300 mA ? |
| Answer» | |
| 13323. |
How many electrons pass through a lamp in oneminute if the current is 300 mA? [Ans. 1 |
|
Answer» tnx |
|
| 13324. |
(a) List the factors on which the resistance of a conductor in the shape of a wire depends.(b) Why are metals good conductors of electricity whereas glass is a bad conductor of clectricityGive reason.(c) Why are alloys commonly used in electrical heating devices? Give reasons. |
|
Answer» There are four factors that influence the resistance in a conductor.Thickness(cross sectional area of the wire),length, andtemperature. The fourth factor is theconductivityof thematerialthat is used. Metalparticles are held by strong metallic bounds that is they have high melting and boiling points. Thus free electrons inmetalscan move through themetalsallowingelectricityto pass through themetals. Alloysareused in electricalheating devices rather than pure metals because the resistivity of analloy ismore than the resistivity of a pure metal. |
|
| 13325. |
i0. Water falling from a G0 m high fall is to be used forgenerating eleetrie energy, If 1 8x 10" kg of water fallsper hour and half the gravitational potential energy cane converted into eleetrie enerey, how many 100 wlamps can be lit ? |
| Answer» | |
| 13326. |
Show that the centre of mass of a uniform rod of mass M and length L lies at the middle point of the rod. |
|
Answer» Suppose a rod of mass M and length L is lying along the x-axis with its one end at x = 0 and the other at x = L. Mass per unit length of the rod l = M/L Hence, dm, (the mass of the element dx situated at x = x is) = l dxThe coordinates of the element dx are (x, 0, 0). Therefore, x-coordinate of COM of the rod will beX=0The y-coordinate of COM isy=0 Similarly, zCOM= 0 i.e., the coordinates of COM of the rod are ( 0, 0), i.e., it lies at the centre of the rod. |
|
| 13327. |
ej ShrIliess UI. A pendulum oscillates 40 times in 4 seconds. Find its time period andfrequency. |
| Answer» | |
| 13328. |
Numerical problems1. A pendulum oscillates 50 times in 5 seconds.Find its time period and frequency |
| Answer» | |
| 13329. |
a) A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency |
|
Answer» Frequency = oscillation per second = 10 oscillation per secondtime period = 1/Frequency= 0.1second |
|
| 13330. |
pendulum oscillates 40 times in 4 seconds. Find its time period andfrequency5. A |
| Answer» | |
| 13331. |
53. A hunter has a machine gun that can fire 50 gram bullets with a velocity of 150 m s. A 60 kg tiger springsat him with a velocity of 10 m s-1. How many bullets must the hunter fire per second into the tiger in orderto stop him in his track? |
| Answer» | |
| 13332. |
Sample Problem A bob weighing 50 gram hangs vertically at the end of a string 50 cm long.If 20 gram force is applied horizontally, by how much distance the bob is pulled aside from its initialposition when it reaches in equilibrium position ? |
| Answer» | |
| 13333. |
ools from 8O °C to 50 °C in 5 minutes. Calculate the time it takes to coolA body cfrom 60 °C to 30 °C. The temperature of the surroundings is 20 °c.11.22 |
| Answer» | |
| 13334. |
At which temperature of the following, does any gashas average moleculer kinetic energy double that of at20° C(1)40° C(3)313°C21.(2) 80° C(4) 586° C |
| Answer» | |
| 13335. |
A piece of material weighing 50 g is coated with 6.3 g of wax of relative density 0.9. If thecoated piece weighs 16.3 g in water, the density of the material is. |
| Answer» | |
| 13336. |
The focal length of a concave mirror is 'x'.The sum of the focal length and radious ofcurvature of the mirror will be- |
| Answer» | |
| 13337. |
10. Find m so that the vectors A 5-10 jand B 2 mi+(1 /2) j are parallel |
|
Answer» Please hit the like button if this helped you out. |
|
| 13338. |
Σα-1130,is equal to .r= 145REDMI NOTE 5 PROMI DUAL CAMERA(B) 55(D) sum of first ten anubsof frst nine natural numbers2018/9/7 1311 |
| Answer» | |
| 13339. |
d) A fire tong has its arms 20cm long. It is used to lift a coal of weight 1.5kgf by applying aeffort at a distance of 15cm from the fulcrum. Find the mechanical advantage and effortneeded. |
|
Answer» Mechanical advantage is = distance of force from fulcrum / distance of load from fulcrum = 15 cm / (20 - 15) cm = 3 Weight of coal / Force or effort needed = 3 = mech. adv. So effort needed = weight of coal / 3 = 1.5 kgf /3 = 0.5kgf |
|
| 13340. |
A 3 em tall object is placed at a distance of 7.5 em froma convex mirror of focal length 6 em. Find the location,size and nature of the image. |
| Answer» | |
| 13341. |
er low at 220v are connected in09- Two lamps one rated 60w at 220v and other 40w at 220v are conparallel to the electric supply at 220v.(a) Draw a circuit diagram to show the connection.151Insumed by the two lamps together(b) Calculate the current drawn from the electric su(c) Calculate the total energy consumed by the two lanwhen they operates for one hour ? |
| Answer» | |
| 13342. |
Session: 2018-2019Diemensionsof potential energyd) of thesea)L^2M^1 T^2b)L^2M^1'T^1c)L^1M^1T^-2 |
|
Answer» A OPTION Potential energy (PE) = Mass(M) X Gravitational acceleration (g) X Altitude (h). Putting this value in the above equation we get, Dimensional Formula of Potential energy= M1L2T-2. SI unit of Potential energy is Joule (J). thanks |
|
| 13343. |
15, A body thrown upward from ground covers equaldistances in 4th and 7th second. The initial velocity ofthe body was(1) 20 m/s(3) 30 m/s(2) 50 m/s(4) 10 m/s |
| Answer» | |
| 13344. |
8. Prove that the coefficient of static friction is tangent" of the angle of repose. |
|
Answer» thanks😊 |
|
| 13345. |
6. Can two identical and independent sodium lamps act as coherent sources? Give reason foryour answer. |
| Answer» | |
| 13346. |
What is sound wave? |
|
Answer» A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water, or any other liquid or solid matter) as it propagates away from the source of the sound. The source is some object that causes a vibration, such as a ringing telephone, or a person's vocal chords. The vibration disturbs the particles in the surrounding medium; those particles disturb those next to them, and so on. The pattern of the disturbance creates outward movement in a wave pattern, like waves of seawater on the ocean. The wave carries the sound energy through the medium, usually in all directions and less intensely as it moves farther from the source. A wave of compression and rarefraction by which sound is propagate is an elastic medium such as air is known as sound wave |
|
| 13347. |
A ball is thrown downward from a height of 30 m with a velocityof 10 m s1. Determine the velocity with which the ball strikesthe ground by using law of conservation of energy |
|
Answer» P.E Initial = mgh = m*(10*30)= 300mK.E initial = 1/2*m*v² = 50m now finally , P.E = 0 , K.E = m*v²/2 so, by Conservation of energy mv²/2 = 300m+50m=> v² = 2*350 = 700=> v = 10√7 m/s |
|
| 13348. |
Example 12 One body is thrown at anangle with the horizontal and another similarbody is thrown at an angle with the verticaldirection from the same point with some velocity40 ms ! The second body reaches 50 metreshigher than the first body. Determine theirindividual heights. Take g = 10 ms-2. |
| Answer» | |
| 13349. |
. Determine the maximum acceleration of the train inwhich a box lying on its floor will remain stationaryIt is given that the coefficient of static frictionbetween the box and the floor of the train is 0.13.(g = 9.8 ms-2) |
|
Answer» 0.13*10 = 1.3 m/s² |
|
| 13350. |
14. A sound wave travels at a speed of 339 m s. If its wavelengthels at a speed of 339 m 5-1. If its wavelength is 15 cm, what is the frequency of thewave ? Will it be audible ? |
| Answer» | |