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.
| 1151. |
A cell is connected to a bulb which develops a potential difference of 12volt across it. The current in circuit is measured to be 2 ampere. Find the resistance offered by the filament of bulb to the flow of current. |
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Answer» Solution :Given : `V = 12 "volt", I = 2 "ampere"`. Resistance of filament of BULB `R = (V)/(I) = (12 "volt")/(2 "ampere") = 6 "ohm"`. |
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| 1152. |
What does the odometer of an automobile measure ? |
| Answer» Solution :The odometer of an AUTOMOBILE measures the DISTANCE TRAVELLED by it. | |
| 1153. |
The S.I. unit of velocity is : |
| Answer» Solution :NA | |
| 1154. |
A bird sitting on a high power electric line is still safe. How? |
| Answer» Solution :Birds don.t GET shocked when they sit on electrical WIRES because they are not good conductors of ELECTRICITY. Electricity flowingthrough a single power line at 35,000 volts will continue ALONG the path of least resistance and bypass birds, because there is no difference in electrical POTENTIAL. | |
| 1155. |
Give reasons why-an igloo is built as a winter shelter |
| Answer» Solution : igloo is built as a winter shelter DUE to snow.s INSULATING PROPERTY. The INSIDE of an igloo acts as an insulator and keeps it RELATIVELY warm. | |
| 1157. |
In a thermos flask, heat loss by conduction and convection can be avoided by |
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Answer» providing vecuum between the TWO WALLS of the flask. |
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| 1158. |
Lifting a small stone to a certain height and then dropping it downwards. From where did the stone get the force for the acceleration? |
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| 1159. |
Which is the correct figure in case of liquid ? Why? . |
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| 1161. |
If each side of a cube becomes n times, its volume becomes: |
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Answer» 3 N TIMES `n^2` times |
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| 1162. |
(Mole to Mole calculation) How many moles of NH_(3) can be produced from 2.0 mol H_(2) in the reaction N_(2)(g)+3H_(2)(g) to 2NH_(3)(g)? |
| Answer» SOLUTION :From the balanced CHEMCIAL equation, we see that 3 mol `H_(2)` reacts (with 1 mol `N_(2)`)to give 2 mol `NH_(3)""THEREFORE` 2.0 mol of `H_(2)=(2)/(3)xx2=(4)/(3)=1.33" mol of "NH_(3)`. | |
| 1163. |
Which of the following solar radiations pass through the atmosphere of earth ? X-rays, ultraviolet rays, visible light rays, infrared radiation. |
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| 1164. |
A block of 2 kg is lifted up through 2mfrom the ground. Calculate the potential energ of the block at that point. |
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Answer» SOLUTION :MASS of theblock, m = 2kg Height raised, h = 2 m Acceleration due to gravity, `g = 9.8m//s^(2)` Potential ENERGY of the BLOCK, P.E. = MG h ` = (2)(9.8)(2)` ` = 39.2` J |
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| 1167. |
Pressure of a gas enclosed in a container can be measured using a manometer. |
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| 1168. |
A body is thrown up with a kinetic energy of 10 J. If it attains maximum height of 5 m, then find its mass. (g=10ms^(-2)) |
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Answer» `2kg` So, `E_(k)=E_(p)` `therefore mgh=10J` `therefore m=(10J)/(gh)=(10J)/((10ms^(-2))(5m))=0.2kg` |
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| 1169. |
What is the commerical unit of energy? |
| Answer» SOLUTION :The COMMERCIAL UNIT of ENERGY is kilowatt hour (kWh). | |
| 1170. |
Find the ratio of effortsrequired to raise a given load, when the angle of inclination of a given plank is changed from 60^(@) to 30^(@). Also find the percentage change in the mechanical advantage. |
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Answer» SOLUTION :The ratio of efforts `((E_(1))/(E_(2)))` is `(E_(1))/(E_(2))=(mg SIN theta_(1))/(mg sin theta_(2)) rArr (E_(1))/(E_(2))=(sin theta_(1))/(sin theta_(2))` Substituting ` sin 60^(@)=(sqrt(3))/(2)` and ` sin 30^(@)=1//2`, we get `(E_(1))/(E_(2))=(sqrt(3))/(2)xx2=sqrt(3)` `:.E_(1):E_(2)= sqrt(3):1` Change in M.A. ` = (1)/(sin 30^(@))-(1)/(sin 60^(@))=2-(2)/(sqrt(3))` `=2(1-(1)/(sqrt(3)))=2((sqrt(3)-1)/(sqrt(3)))` % Change in MA =`("Change in MA")/("INITIAL MA")xx100` `=(2 (sqrt(3)-1))/(sqrt(3)xx(2)/(3))xx100=(sqrt(3)-1)xx100` `= 0.732xx100=73.2%` |
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| 1171. |
The velocity of a particle performing motion with uniform acceleration on a linear path, at position 'x' is 'v' and v = sqrt (196-16x), where x is in metre. What would be the acceleration of this particle? Take initial velocity of particle = 14 m s^(-1) |
| Answer» SOLUTION :`a =- 8 MS ^(-2)` | |
| 1172. |
Why do petroleum based products float on surface of water? |
| Answer» Solution :PETROLEUM based PRODUCTS fat on WATER because their SPECIFIC GRAVITY is low. | |
| 1174. |
Draw and explain electric circuit diagram. |
Answer» Solution :To represent an ELECTRICAL wiring or solve problem involving electric CIRCUITS, the circuit diagrams are made. The four main components of any circuits namely the, (i) cell, (ii) connecting wire, (iii) switch and (iv) resistor or LOAD are given above. In addition to the above many other electrical components are also used in an actual circuit. A UNIFORM system of symbols has been evolved to describe them. It is LIKE learning a sign language, but useful in understanding circuit diagrams. 
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| 1175. |
An object has moved through a distance. Can it have zero displacement ? If yes, support your answer with an example. |
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Answer» Solution :Yes, the object can have zero DISPLACEMENT. The object moves from a CERTAIN POINT A and reaches point B, a DISTANCE of 10 km. Then the object moves from point B and reaches point A, a distance of 10 km. The object has covered 10 km + 10 km = 20 km. But the object after coverring certain distance has reached the starting point. So the displacement of the object is zero. |
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| 1176. |
A car is moving on a straight road with uniform acceleration. The speed of the car varies with time as follows : {:("Time"(s)"":,,0,,2,,4,,6,,8,,10),("Speed"(m//s)" ":,,4,,8,,12,,16,,20,,24):} Draw the speed-time graph by choosing a convenient scale. From this graph : (i) Calculate the acceleration of the car. (ii) Calculate the distance travelled by the car in 10 seconds. |
| Answer» SOLUTION :(i) 2 m/`s^(2)` (II) 140 m | |
| 1177. |
Fig shows the same block of wood floating in three different liquids A,B and C of densities rho_(1),rho_(2) and rho_(3) respectively. Which liquid has the highest density? Give reason for your answer. |
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| 1178. |
The velocity - time graph of a particle falling freely under gravity would be straight line parallel to the x-axis. |
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| 1179. |
The diaphragm in a photographic camera |
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Answer» controls the exposure time of the film. |
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| 1180. |
The foundations of high-rise buildings are kept wide so that they may exert more pressure on the ground. |
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| 1181. |
A car travels from rest with a constant acceleration 'a' for 't' seconds.What is the average speed of the car for its journey if the car moves along a straight road? |
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Answer» SOLUTION :The car starts from rest, so U = 0 The distance COVERED in time t s = `(1)/(2) at^(2) ` Average speed= `(" Total distance " )/("Time taken " )` `v = (("at"^(2)))/(t)` = `(at)/(2) ` |
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| 1182. |
A car and a lorry are travelling at the same velocity.Which has greater momentum?Why? |
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| 1183. |
How do the following factors affect, if at all, the speed of sound in air : frequency of sound |
| Answer» SOLUTION :No EFFECT | |
| 1184. |
The ratio of the quantity of heat absorbed by the surface of a body to the quantity of heat falling on it in one second is called |
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Answer» REFLECTING POWER of the body |
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| 1185. |
Explain : how bats use ultrasound to catch a prey. |
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Answer» Solution :Echoranging determine the time period with the CORRESPONDING velocity of the ultrasonic SOUND . Gives US the distance. `d=(vxxt)/(2).` |
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| 1187. |
The speed time graph for a car is shown in fig 8.12 Find out how far the car travels in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period. |
Answer» SOLUTION : The shaded area which is equal to `½ xx 4 xx 6= 12M` REPRESENTS the DISTANCE travelled by the car in the first 4S. |
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| 1188. |
What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis ? |
| Answer» SOLUTION :The OBJECT is at REST. | |
| 1189. |
What are weak X-rays ? |
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| 1190. |
A body of weight 1000 N sinks in water. The weight of the liquid overflowed is 250 N. A body of the same weight as above floats in water. What is its weights in water? What will be the weigt of the water displaced? |
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| 1191. |
The angle of dip increases as we move from the Earth's magnetic equator to its magnetic poles. |
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| 1192. |
The stability of a galvanoscope to detect weak current increases with ______ |
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Answer» DECREASES in NUMBER of turns |
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| 1193. |
A stone and a sheet of paper are dropped.together. Which of the following statements regarding their tall is true? - Both of them reach simultaneously - The paper reaches first - The stone reaches first |
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Answer» REASON: RESISTANCE of air |
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| 1194. |
While swimming why do we fell light ? |
| Answer» Solution :The swimmer is exerted by an UPWARD FORCE of WATER, this phenomenon is called buoyancy and it makes the swimmer feel light. | |
| 1195. |
How do the following factors affect, if at all, the speed of sound in air : moisture in air? |
| Answer» SOLUTION :SPEED of SOUND increases with the increase of MOISTURE in AIR. | |
| 1197. |
18 k mh^(-1)is equal to : |
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Answer» 10 `m s^(-1)` |
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| 1198. |
The dead bod of a human being floats with head leaning downwards. Explain. |
| Answer» SOLUTION :The human body is lighter than water but its head is heavier. In swimming therefore, we are to keep the head up by movements of the LIMBS, which produce SUFFICIENT reaction UPWARDS to keep the body AFLOAT. | |
| 1199. |
Why do the fish plates of railway tracks have oval shaped holes ? |
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Answer» SOLUTION :(i) If the fish plates have circular (holes-shaped instead of oval-shaped), do the railway tracks have scope for horizontal thermal EXPANSION ? (II) `24^(@)C` |
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| 1200. |
Is the uniform circular motion accelerated? Give reasons for your answer. |
| Answer» Solution :When an object is moving with a constant speed along a circular path, the velocity changes due to the change in direction. HENCE it is an ACCELERATED motion. | |