InterviewSolution
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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.
| 201. |
Three metallic spheres A,B and C have their masses in the ratio 1:2:3, specific heat capacities in the ratio 6:3:4. When the initial temperature of the spheres are measrued in Celsius scale, the ratio of their temperature is found to be 1:2:3. Initially the two spheres A and B are brought into contact. when equilibrium temperature is attained, sphere B is brought into contact with 'C'. Determine the ratio of the final temperatures of A,B and C as measured in Celsius scale. |
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Answer» Solution :Let the masses of A,B and C be m, 2m and 3M the specific heat capacities be 6s, 3s and 4s ad the initial temperatures be t,2t, and 3t SINCE the temperature of A is less than the temperature of B,heat flows from B to A when these two are brough into contact. If `theta_(1)` is the equilibrium temperature, `t lt theta_(1) lt 2t` heat lsot be hot body=heat gained by cold body ltBrgt `therefore(2m)(3s)(2t-theta_(1))=(m)(6s)(theta_(1)-t)` `6(2t-theta_(1))=6(theta_(1)-t)` `2theta_(1)=3t` `theta_(1)=(3t)/(2)` (You MAY observe here that since `m_(1)s_(1)=m_(2)s_(2),Deltat_(1)=t_(2) and theta_(1)` is the average of t ad 2t). Thus, `t_(A)=t_(B)=(3t)/(2)` WhenB and C are brough into contact the equilibrium temperature `theta_(2)` will be greater than that of B `=(3t)/(2)` and less than that of `C(=3t)` Once again heat lost by hot body (C)=heat gained by cold body (B). I.E., `(3m)(4s)(3t-theta_(2))=(2m)(3s)(theta_(2)-(3t)/(2))` `2(3t-theta_(2))=(theta_(2)-(3t)/(2))` `3theta_(2)=6T+(3t)/(2)` `theta_(2)=(5t)/(2)` i.e., `t_(B)=t_(C)=(5t)/(2)` `thereforet_(A):t_(B):t_(C)=(3t)/(2):(5t)/(2):(5t)/(2)=3:5:5` |
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| 202. |
The bounderies of the plates of the earth's surface where earthquakes occur most frequently are called_______ |
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Answer» QUAKE zones |
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| 203. |
If an object is said to have undergone change in its state of motion, what do you mean by it? |
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| 204. |
A bar magnet has a pole strength of 15 Am. If the distance from its centre of either of the poles is 15 cm, arrange the following steps in sequential order to find its magnetic moment in SI unit. (a) Write the given value of pole strength (m) of the magnet. (b) Substitute the value in the above formula to get the value of M. (c) Find the value of length (l) of the magnet from the problem and convert it into SI unit. (d) Write the required formula, i.e., magnetic moment (M)=mx 2l |
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Answer» acbd (b) Write the required FORMULA, ie magnetic moment (M) =m X 2l (C) Find the value of (l) of the magnet from the problem and CONVERT it into SI unit. (d) Substitute the values in the above formula to GET the value of M. |
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| 205. |
Give two examples of situations in which applied force causes a change inthe shape of an object. |
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| 206. |
The amount of heat absorbed by a body while raising its temperature is given by the equation. Q = mstheta , here Q is the amount of heat, m is the mass of the body, s is the specific heat capacity and theta is the rise tmemperature. Dertermine the S.I. unit and C.G.S. unit of heat and specific heat capacity |
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Answer» Solution :(i) S.I. unit ofheat is `1 J (= 1"KG" m^(2) s^(-2))` "and its CGS unit is" `1 "erg" (= 1 G cm^(2) s^(-2))` (II) erg `g^(-1)" "^(0)C^(-1),Jkg^(-1) k^(-1)` |
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| 208. |
A horse is tied to a rope of length 5 cm and the other end of the rope is tied to a pole. Find the displacement and the distance travelled by the horse in the following cases (i) When the horse makes half revolution along a circular path. (ii) When it makes one full revolution (iii) When it makes (3)/(4) th of the revolution. |
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Answer» Solution : (i)Half revolution along the circular path. Distance travelled by the horce `=(2pir)/(2)=pir=pixx55pim` Displacment of the horse = DIAMETER of the circular path, `bar(H_(1)H_(2))` = 10m from `H_(1)"to" H_(2)`  (II) When the horse MAKES full revolution Distance traveleld by the horse = circumference of the circular path `=2pir=2pixx5=10m` Displacement of the horse= zero (Sicne INITIAL and FINAL position of the horse conincide)  (III) When the horse makes `(3)/(4)` th of the revolution  Distane travelled by the horse `=(3)/(4)` th of the circumference of the circle = `(3)/(4)(2pir)` `(3)/(2)xxpixx5=(15)/(2)pi=7.5pi m` Displacment of the horse `= bar (H_(1) H_(2))` `|bar(H_(1)H_(2))|` = shortest distance between `H_(1) and H_(2)` `=sqrt(5^(2)+5^(2))= sqrt(25+25)=sqrt(50)` `=5sqrt(2)mH_(1) "to"H_(2)` |
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| 209. |
I read somewhere that underground explosions could also cause remors. |
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| 210. |
How can cataract be treated? |
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| 211. |
Find out the work done when a force of 30 N displaces a body through 8 m in the direction of the applied force. |
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| 212. |
Choose the correct option(Multiple choice questions): ___ is used by jewellers for electroplating. |
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Answer» Chromium |
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| 213. |
Fill in the blanks : _____ and _______ have no satellite of their own. |
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| 214. |
What are the advantages and disadvantage of using nuclear energy ? |
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Answer» Solution :Is nuclear WASTAGE hazardous ? Is it possible to produce mnuclear ISOTOPES ? Is nuclear radiations harmful to biological life ? Is nuclear TECHNOLOGY CHEAP or expensive ? Is current produced by nuclear reactors less expensive ? Find various USES of nuclear isotopes ? |
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| 216. |
What is an electrolyte? |
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| 217. |
Within the cell, conventional current flows from its negative to the positive terminal . |
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| 218. |
Explain why isolated magnetic pole do not exist ? |
| Answer» Solution :The smallest PARTICLE which can be OBTAINED by diving a magnet by PHYSICAL PROCESS is a MOLECULE. | |
| 219. |
A car is travelling at a velocity of 10 m/s and has a mass of 850 kg. What is its kinetic energy? |
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| 220. |
A king ordered a goldsmith to prepare a crown wth 1 kg pure gold. The relative density of pure gold is given as 19. Is it possible to find the adulteration if the goldsmtih adds some impurity inmaking the crown. If so how? Explain. |
| Answer» SOLUTION :The mass of the crown can be measured by using a BALANCE that can measure the mass more accurately. The volume of the crown can be found by immmersing it in an overflow jar and measuring the volume of water over flown. Once the mass of the crown and its volume are known, its DENSITY of the crown is 19 g cm^(-3) (Since relative density of gold is given as 19) , the crown is made of pure gold. OTHERWISE it can be concluded that the crown is made adulterated gold. | |
| 221. |
Whena magnet is broken into two parts, |
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Answer» the BIGGER parts acts like the north pole. |
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| 222. |
In the process of boiling, |
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Answer» Kinietic and potential energy of water MOLECULES INCREASES |
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| 223. |
Two iron rods of length of 2.2 m and 0.8 m of uniform densities are suspended from their ends and made of oscillate. Find the time periods of the two rods. Which rod gains time as compared to the time period of seconds pendulum ? |
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Answer» SOLUTION :(i) The ROD which has more TIME PERIOD LOSES time (ii) `2.1s, 1.3s`, first rod |
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| 224. |
Frictional force always acts in a direction opposite to the weight of the body. |
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| 225. |
What is muscular force? |
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| 226. |
If 4 waves are produced in 2s, then the time period of the wave is _______ |
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| 228. |
How do we see moon? |
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| 229. |
State whether the following statements are true or false : Visual aids, tactual aids and electronic aids are the types of non-optical aids. |
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| 230. |
If the wavelength of the wave is 24 cm, then the distance between the first compression and the third subsequent rarefaction in a longitudinal wave is ____ cm |
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| 231. |
3000 J of work is done by a machine by applying a force of 500 N. Calculate the distance to which it is moved. |
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| 232. |
Fill in the blanks : In human beings, sound is produced when the ________ vibrate. |
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| 234. |
why in an electrical method of magnetisation, a direct current is used. |
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| 236. |
Edwin Aldrin is the ________ person to land on moon. |
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Answer» First |
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| 237. |
To detect electriccurrent using a galvanoscope, the plane of the coil is placed along magnetic meridian. What happens if the plane of coil is along east-west direction ? |
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Answer» Solution :Will the magnetic NEEDLE show any deflection if the magnetic FIELD produced DUE to the flow electric current is along the same direction as the earth's magnetic field? How do you DETECT the flow of electric current in such CASES? |
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| 238. |
Time taken to complete one oscillation is called _____________ . |
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Answer» frequency |
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| 239. |
Choose the correct option (Multiple choice questions) : ________is a natural phenomenon showing dispersion. |
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Answer» Snowfall |
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| 240. |
What is rolling friction? |
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| 241. |
Choose the correct option (Multiple choice questions) : The idea of number of images formed by mirrors placed at an angle to one another is used in a________. |
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Answer» kaleidoscope |
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| 242. |
Fill in the blanks : The size of the __________ part of the moon visible from the Earth increases each day after f!ie new moon day. |
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| 243. |
Calculate the work done by a porter holding a suitcase weighing 5 kg in his hand. |
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| 245. |
Choose the correct option (Multiple choice questions) : ________is/are sensitive to bright light. |
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Answer» Rods |
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| 246. |
What keeps the celestial objects revolve around the sun? |
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| 248. |
The device which converts light energy into electrical energy and generates its own potential difference is _________. |
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| 249. |
What happens if two charged objects made of different materials are brought close to each other? |
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| 250. |
When a disturbance is created in a medium, the particles in the medium perform ____ |
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Answer» non-periodic motion |
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