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.
| 951. |
thecorrectedlength of a rodwhenmeasured withthe helpof a verniercalipers is 25.4 mm (Refer the figurebelow) Determine the zeroerror. |
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Answer» SOLUTION :30.56 12.6 21.09 `"______"` 64.25 `"______"` whenroundedoff to onedecimalpointthe VALUE is64.2 |
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| 952. |
State the positions of neutral points when a magnet is placed with its axis in the magnetic meridian and with its north pole pointing towards the geographic north . |
| Answer» SOLUTION :in east-west DIRECTION | |
| 953. |
Relative density of silver is 10.5. What is the density of silver in S.I. unit? What assumption do you make in your calculations. |
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Answer» SOLUTION :GIVEN R.D. of silver `=10.5` R.D. `=("Density of silver")/("Density of water")` `:.` Density of silver `= R.D. xx` density of water `=10.5xx10^(3)kgm^(-3)` . ASSUMPTION: Density of water `=10^(3)kgm^(-3)`. |
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| 954. |
(a) A student throws a ballvertically upward so tha it just reaches the height of window on th second floor of a dormitory. At the same time the ball is thrown upward, a student at the windoe drops a ball. Are the mechanical energies of the ball the same at half the height of the window ? Exaplain (b) What does work- energy theorem state ? |
| Answer» SOLUTION :(a) Yes. When the thrown-up ball is at maximumheight, its velocity is zero so it has same energy as the dropped ball. Since the total energy of each ball is conserved, both the BALLS will have same mechanical energy at HALF the height of the window. ASA matter of fact, both the balls will have the same kinetic and potential energy at half height position. (b) Work done = change in KE (or PE) | |
| 955. |
An object travels 16 m in 4s and then another 16 min 2 s. What is the average speed of the object? |
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Answer» Solution :Total distance travelled by the object= 16 m + 16 m-=32 m Total time taken 4s+2 s = 6 s AVERAGE speed =`"Total distance travelled"/"total time taken"=32/6 =5.33 MS^(-1)` Therefore,the average speed of the object is `5.33 ms^(-1)` |
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| 957. |
The numerical ratio of displacement to distance for a moving object is…… |
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Answer» ALWAYS less than1 |
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| 958. |
A cyclist travels 5km in the east direction. Then he travels 12km in the south direction. What is the magnitude of displacement of the cyclist ? |
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Answer» 17 KM `s = sqrt ((5) ^(2) + (12) ^(2)) = 13 km` 
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| 959. |
The velocity-time graph for a uniformly retarded body is a straight line inclined to the time axis with an obtuse angle. How is retardation calculated from the velocitytime graph ? |
| Answer» SOLUTION :By FINDING the NEGATIVE SLOPE. | |
| 960. |
Draw and label the diagram of an AC generator. |
Answer» SOLUTION :
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| 961. |
A copper calorimeter of mass 100 g contians 200 g of ice at -10^(@)C. The thermal energy is upplied to the calorimeter and its contents at the rate of 50 calories per second. What is temperature of the calorimeter and its contents after ten minutes. (Given, the specific heat of ice =0.5 cal g^(-1)""^(@)C^(-1), the specific heat of copper =0.1 cal g^(-1)""^(@)C^(-1), and latent heat of fusion of ice =80 cal g^(-1) |
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Answer» SOLUTION :(i) Use `=mL and Q= ms Delta theta ` according to the situation. Use principle of calorimetery. TOTAL HEAT produced = (mass of the substance ) `xx` (calorific value of the substance). (ii) `5.46 MJ kg^(-1)` |
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| 962. |
A circus artist rides a bicycle, on a rope tied horizontally. This is an example of ____ equilibrium. |
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Answer» NEUTRAL |
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| 963. |
Differentiate between the three temperature scales. |
Answer» SOLUTION :
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| 964. |
A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car |
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Answer» BECOMES TWICE to that of the initial |
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| 965. |
Name these forces, (a ) the upward push of water on a submerged object (b) the force which wears away two suefaces as they move over one another (c ) the force which pulled the apple off Isaac Newton's tree: ( d ) the force which stops you falling through the floor. |
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| 966. |
Fill in the blanks to complete the sentences : A freely suspended magnet rests in the geographic ….......... direction. |
| Answer» SOLUTION :north-south | |
| 967. |
What is power? |
| Answer» Solution :POWER is defined as the rate of doing WORK or the rate of TRANSFER of ENERGY. | |
| 969. |
How can the intensity and energy of X-rays be changed? |
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| 970. |
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 m/s^(2), find the maximum height reached by the the stone. What is the net displacement and the total distance covered by the stone? |
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Answer» Solution :h = s `V^(2) - U^(2) = `2gs `0^(2) - (40)^(2) = 2 xx (-10) `s s = 80 m Total distance = 80 m + 80 m = 160 m |
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| 971. |
Take a toy car. Wind it using its key. Place the car on the ground. Does the energy acquired depend on the number of windings? How can you test this? |
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Answer» Solution :YES. If the number of winding is more (up to a CERTAIN limit), more is the energy stored in it. The toy car will MOVE a GREATER distance. |
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| 972. |
Automobiles are fitted with a device that shows the distance travelled. Such a device is known as an odometer. A car is driven from Bhubaneshwar to New Delhi. The difference between the final reading and the initial reading of the odometer is 1850 km. Find the magnitude of the displacement between Bhubaneshwar and New Delhi by using the Road Map of India. |
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Answer» Solution :To find the magnitude of the DISPLACEMENT, MEASURE the straight distance between Bhubaneshwar and Delhi on the map of India. Then convert the straight distance into km as per given scale in the map. `to` From the map this straight distance (i.e., displacement) is APPROXIMATELY 1270 km (For displacement the aerial distance between the TWO cities can also be considered.) |
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| 973. |
Assertion: Displacement of a body may be zero when distance travelled by it is not zero. Reason: The displacement is the shortest distance between initial and final position. |
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Answer» If both assertion and REASON are true and reason is the CORRECT explanation of assertion |
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| 974. |
A piece of wax floats in brine. What fraction of its volume will be immersed? Density of wax = "0.95 g cm"^(-3) , Density of brine = "1.1 g cm"^(-3). |
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| 975. |
A body rises vertically up to a height of 125 m in 5 s and then comes back at the point of projection. Find: (i) the total distance travelled, (ii) the displacement, (iii) the average speed and (iv) the average velocity of the body. |
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Answer» Solution :Given, S = 125 m, t = 5 s (i) Total DISTANCE travelled=S+S=2S = `2 xx 125` m = 250 m (II) Displacement = 0 (since final position is same as initial position). Total distance travelled (iii) Average speed = `("Total distance travelled ")/("Total time of JOURNEY")` `=(2S)/(2T) = (2xx 125 m)/(2xx5s )` (iv) Average velocity =0 ( since displacement is ZERO). |
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| 976. |
A porter is standing with a suitcase over his head. What is the work done by him? |
| Answer» Solution :The PORTER has DONE no WORK because the suitcase REMAINS at rest. | |
| 977. |
Find out the reasons for the following. A ship floats on water. |
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| 978. |
Why does a block of wood held under water rise to the surface when released ? |
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| 979. |
The relative density of mercury is 13.6. State its density in (i) C.G.Sunit (ii) S.I. unit. |
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| 980. |
Distance covered by a particle never becomes zero but displacement becomeszero. |
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| 981. |
UsingVernier caliper find the outer diameter of your pen cap. |
Answer» SOLUTION :
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| 982. |
A body of mass 3.5 kg displaces 1000cm^(3) of water when fully immersed inside it. Calculate :(i) the volume of body (ii) the upthrust on body and (iii) the apparent weight of body in water. |
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| 983. |
What happens to the force between two objects. (i) The mass of one object is doubled? The distance between the objects is doubled and tripled The masses of both objects is doubled? |
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Answer» Solution :From universal law of force exerted on an object of mass m by earth is given by `F=G(MXM)/(r^(2))............` Equation 1 When mass of the object say m is doubled than `F^(1)=G(Mx2m)/(r^(2))=2F` So as the mass of any one of the object is doubled the force is also doubled. The force F Is inversely proportional to the DISTANCE between the OBJECTS. So if the distance between two objects is doubled then the gravitational force of attraction between them is reduced to one fourth of its original value Similarly if the distance between two objects is tripled, then the gravitational force of attraction becomes one ninth of its original value. Again from universal law of attraction from equation 1 from F is directly proportional to the product of both the masses. So if both the masses are doubled then the gravitational force of attraction becomes four TIMES the original value. |
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| 985. |
Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets |
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| 986. |
A graph of velocity versus time (v - t) for an object performing motion with uniform acceleration is shown What would be the velocity of the object at time t= 0? |
| Answer» Answer :B | |
| 987. |
Name the characteristics that describe a sound. |
| Answer» Solution :A SOUND wave can be described COMPLETELY by FIVE CHARACTERISTICS viz - amplitude, frequency, time PERIOD, wavelength and velocity or speed. | |
| 988. |
(a) A body thrown in the vertically upward direction rises up to a height 'h' and comes back to the position of rest. Calculate the displacement of the body. (b) A body starts to slide over a horizontal surface with an initial velocity of 0.5 m s^(-1). Due to friction, its velocity decreases at the rate of 0.05 ms^(-2). How much time will it take for the body to stop ? |
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Answer» Solution :(a) The displacemenet of the body isd ZERO. Because the initial starting POSITION and the final positon are the same. (b) Her, `u = 0.5 ms ^(-1) ,V =0, a =- 0.05 ms ^(-2)` `(because` the velocity decreases), t = ? ` v = u + at` `therefore 0 =0.5 ms ^(-1) + (-0.05 ms ^(-2)) xx t ` `therefore 0.05 ms ^(-2) xx t =0.5 ms ^(-1)` `therefore t = (0.5 ms ^(-1))/(0.05 ms ^(-2))= 10 s ` The body will stop after 10 second. |
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| 989. |
(a) What is meant by 'reflection of sound'? What type of surfaces are the best for reflecting sound? (b) Name any two objects which are good reflectors of sound. (c) State the laws of reflection of sound. |
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| 990. |
A metal cube of edge 5 cm and density 9.0cm^(-3) is suspended by a thread so as to be completely immersed in a liquid of density 1.2gcm^(-3). Find the tension in thread. (Take g=10ms^(-2)) |
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| 991. |
Fill in the following blanks with suitable words: (a) The acceleration due to gravity on the moon is about . (b) In order that the force of gravitation between two bodies may become noticeable and cause motion, one of the bodies must have an of that on the earth. extremely large ( c) The weight of an object on the earth is about ........of its weight on the moon. (d) The weight of an object on the moon is about (e) The value of g on the earth is about .... of that on the moon. |
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| 992. |
A portable radio has a built in transformer so that it can work from the mains instead of batteries. Is this a step up or step down transformer? |
| Answer» Solution :A STEP down TRANSFORMER is USED in a portable radio in order to recuce the VOLTAGE. | |
| 993. |
Find the pressure at a depth of 10 m in water if the atmospheric pressure is 100kPa. [1Pa=1N//m^(2)] [100kPa=10^(5) Pa=10 ^(5) N//m^(2) =1 atm.] |
| Answer» SOLUTION :198 KPA | |
| 994. |
A transformer |
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Answer» Solution :TRANSFORMER is a device USED for converting low voltage into high voltage and high voltage into low voltage. It works on the principle of electromagnetic induction.It consists of PRIMARY and secodnary coil insulated from each other, Depending upon the numbr of turns in the primary and seconary coils, the two types of transformers are step up or step down transformers. Step up transformer The transformer used to change a low alternative voltage to a high alternating voltage is called a step up transformer i.e `(V_(s)gtV_(p))`. In a step up transformer, the number of turns in the secondary coil is more than the number of turns in the primary coil `(N_(s)gtN_(p))`.  Step down transformer The transformer used to change a high alternating voltage to a low alternating voltage is called a step down transformer `(V_(s)ltV_(p))`. In a step down transformer, the number of turns in the secondary coils are less than the number of turns in the primary coil `(N_(s)ltN_(p))` The formulate PERTAINING to the transformers are given in the following equations. The number of primary turns `N_(p)` / The number of secondary turns `N_(s)`= the primary voltage `V_(p)`/ The secondary voltate `V_(s)` The number of secondary turns `N_(s)`/ The number of primary turns `N_(p)` = The primary current 1p/the secondary current 1s |
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| 996. |
If velocity-time graph for a body in motion is a straight line parallel to time axis, what type of motion is the body performing ? |
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Answer» WOULD be stationary |
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| 997. |
Two bodies at different temperatures are placed in contact. State the direction in which the heat willflow. |
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| 998. |
A buoy is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the buoy in equilibrium and state the direction in which each force acts. |
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| 999. |
A block of wood of mass 24 kg floats on water. The volume of wood is 0.032 m^(3) Find a.the volume of block below the surface of water, b.the density of wood. (Denstiy of water =1000kgm^(-3)) |
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| 1000. |
The shock waves and sonic booms produced by super sonic jets can cause hearing loss in people living near the air bases and not in those living in areas away from these bases .Explain . |
| Answer» SOLUTION :How does the INTENSITY of SOUND vary with distance of the POINT of OBSERVATION from the source of sound ? | |