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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.
| 51. |
The electric field at a point is |
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Answer» ALWAYS continuous |
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| 53. |
Torch, battery operated hair dryer, electric bulb, remote of television |
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Answer» Solution :ELECTRIC bulb. All OTHERS USE DC current, WHEREAS electric bulb runs on AC current. |
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| 54. |
Find the relation and complete the word pair. Transformer: Mutual induction Inductor: _______ |
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Answer» |
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| 55. |
Disaters like forest fire and drought also adversely affect the environment. |
| Answer» Solution :FOREST fire is biological DISASTER that is RELATED to plants, while drought is a ATMOSPHERIC, geophysical disaster. | |
| 56. |
Draw a schematic diagram of household/domestic wiring . Give its essential features. |
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Answer» Solution :Figure : Schematic diagram of domestic electric circuit Its main FEATURES are : Electricity is supplied to our homes either from overhead electric poles or underground wiresthrough mains using two wires. One is the live wire with red insulation cover and theother is NEUTRAL wire with back insulation. The POTENTIAL differencebetween the two is 220 volts in INDIA . At the meterboard of the house, these two wires pass into electric meter throughamain fuse. The fuse is a safety device which cutsof electricityif a high current flows through it. Through themain switch, the live and neutral wires are connected to line wires of the house which supply electricityof different circuits. The live wire of each circuitis connected to a separatefuse so that if excess current flows, only the electricityin that part of the circuitis cut off and othersare notaffected. In any part of the house, all appliancesare connected in parallel to each other across the live and neutral wires. This ensures full voltage across eachappliancefrom the mains. Each appliance is provided witha separate switch in its live wire for its operation. Generally thesecircuits are divided into heatingcircuits- which require15 A current and draw more power (likeair conditioners,geysers, etc.) and lightingcircuits - whichrequire 5 A current and draw lesserpower (like bulbs,fans, etc.) Anadditional earth wire with green insulation cover is connected to devices with metal bodies such as toaster, heater,etc. asa safety measure. Oneend of the earth wire is connected to metal part of the device and the other endis connected to a metal plate burieddeep in the ground. Any leakage current in the appliance will then be sentto the earth through earth wire. The burnt-out fuse should be replaced by another fuse of identical rating because ifa fuse of less ratingis used then is blowsoff whennormal current is flowing through it andelectric appliances shall not WORK. If the fuse of higherratingis usedin case of short circuitor overloading,the fuse wouldnot blow up and excess amount of current may harm the appliances. 
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| 57. |
Atomicityofphosphorousis _______. |
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Answer» 4 |
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| 58. |
A body projected horizontally it moves with the same horizontal velocity throughout the motion although it is under the effect of force of gravity. Why ? |
| Answer» SOLUTION :Because HORIZONTAL component of GRAVITY is ZERO along horizontal direction. | |
| 59. |
The string of a pendulum is 2.0m long. The bob is pulled sideways so that the string becomes horizontal and then the bobis released. What isthe speed with which the bob arrives at the lowest point ? Assume theat 10% of initial energy is dissipated against air resistance. Take g=10m//s^(2) |
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Answer» SOLUTION :`1/2 MV^(2)=90% ` of mg H `:.v=6m/s` |
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| 60. |
A student while performing the experiment to find the resultant resistance of two resistors connected in series observes the ammeter pointer at position P when the key is 'off' and the same pointer at position Q when the key is 'on'. The correct reading of ammeter is : |
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Answer» 0.2 A |
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| 61. |
In the experiment to show that CO_(2) is given out during respiration, which chemical is taken in the small test tube two show the liberation of CO_(2) gas |
| Answer» SOLUTION :KOH solution is TAKEN in the small TEST tube. | |
| 62. |
(i) Water has a refractive index 1.33 and alcohol has refractive index 1.36. Which of the medium is optically denser? Give reason for your answer. Draw a ray diagram to show the path of a ray of light passing obliquely from water to alcohol. (ii) The absolute refractive index of diamond is 2.42 and the absolute refractive index of glass is 1.50. Find the refractive index of diamond with respect to glass. |
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Answer» Solution :(i) Refractive INDEX of alcohol `gt` refractive index of water. So, alcohol is OPTICALLY denser than water. When a RAY of light ENTERS from water to alcohol, it bends TOWARDS the normal:  (ii) `""_(g)mu_(D)=(""^(a)prop_(D))/(""^(a)prop_(g))=2.42/1.5=1.61` |
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| 63. |
A good solar cell can have an efficiency of around |
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Answer» 0.15 |
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| 64. |
How much energy is gained by a box of mass 20 kg when a man (a) carrying the box waits for 5 minutes for a bus? (b) ruins carrying the her with a speed of 3 m s^(-1) to catch the bus? (c) raises the box by 0.5 m in order to place it inside the bus? 10 m s^(-2) |
| Answer» Solution :(a) ZERO (B)90 J (c )100 J | |
| 65. |
Setae: |
| Answer» Solution :Setae are LOCOMOTORY ORGANS in some ANNELIDS. Setae HELP in creeping locomotion. | |
| 66. |
Balanoglossus is connecting link between non -chordates and chordates. |
| Answer» SOLUTION :BALANOGLOSSUS shows some characters of non - CHORDATES . It ALSO has notochord as in case of chordates. Since it shares the characters of non - chordates and chordates , from the view point of evolution , it is called connecting LINK between them. | |
| 67. |
Show that one ampere is equivalent to a flow of 6.25xx10^(8) elementary charges per second. |
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Answer» SOLUTION :`I=1A,t=1S,e=1.6xx10^(-19)C` `"q=NE"` `I=q/t=("ne")/(t)` Number of electrons, `n=(If)/(e)=(1xx1)/(1.6xx10^(-19))=6.25xx10^(18)` |
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| 68. |
A pendulum with bob of mass is scillating on either side from its resting position A between the extremes B and Cala vertical height above A. What is the kinetic energy K and potential energy U when the pendulum is al positions (i) A. (ii) B. and (in C? |
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Answer» SOLUTION :(i)K=mgh ,U=0 (II)K=0,U=mgh (III)K=0,U=mgh |
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| 69. |
A bullet fired at an angle of 30^(@) with the horizontal hits the ground 3 km away. By adjusting the angle of projection, can one hope to hit a target 5 km away ? Assume the muzzle speed to be fixed and neglect air resistance. |
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Answer» SOLUTION :MAXIMUM RANGE = 3.46 KM So it is not POSSIBLE. |
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| 70. |
Sananth was standing outside in the evening, enjoying the light drizzle after the rain. Suddenly tie observed a rainbow in the sky. He called his father and asked him, what it is and how is it formed? His father explained him about its formation and also told him that similar phenomena can be observed with prism also. What value did Sanath's father exhibit ? |
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Answer» SOLUTION :The father exhibited these values 1. Understanding2. Caring3. Scientific attitude. MS. Vijaya a maid SERVANT of Ramji, complained that she was UNABLE to read the magazines. Mr. Ramji realising that she has an eye problem an took her to an eye doctor and got her eye checked. He also bought a new set of lenses for her. (a) What is the name of the eye defect that Ms Vijaya is suffering from ? (b) What type of lens did doctor prescribe to her ? Vijaya was having a vision defect-Presbyopia, which is an age-related condition affecting everyone usually between the ages of 40 and 50 |
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| 71. |
On the rainy day, Ram reached his grandfather's place in village. On the way to house he saw a beautiful rainbow in the sky. In night, he saw lots of twinkling stars in the clear sky. He was very excited to see these beautiful natural phenomena, which he was not able to see in the city, where he lived with his father. Answer the following questions based on the situation given above. (i) Do you think that pollution in atmosphere affects the formation of rainbow and twinkling of stars? (ii) Do you agree with the fact that pollution-free environment will strengthen such natural phenomena in the cities as well? (iii) What steps can be taken so that the natural phenomena can be enjoyed in cities as well? |
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Answer» Solution :(i) Yes. Though RAINBOW formation and twinkling of stars are the phenomena of light but these won't be visible if there is a lot of POLLUTION in the stratosphere. (ii) Yes. (iii) KEEPING the CITY clean and pollution-free, plant more TREES. |
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| 72. |
Sananth was standing outside in the evening, enjoying the light drizzle after the rain. Suddenly he observed a rainbow in the sky. He called his father and asked him, what it is and how is it formed? His father explained him about its formation and also told him that similar phenomena can be observed with prism also. What is the name of the phenomena ? Which colour deviates more and why ? |
| Answer» Solution :The phenomenon is CALLED dispersion. The process by which a ray of light splits up into SEVEN colours is KNOWN as dispersion of light. The band of the coloured light is called spectrum the red light BENDS the LEAST and violet the most. | |
| 73. |
Apparent elevation of a star appears to be less than its true elevation on account of atmospherie refraction |
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Answer» |
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| 74. |
Explain in detail the laws enacted about environmental conservation. |
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Answer» Solution :i. The laws enacted for conservation of environment are-Forest Conservation Act, 1980, Environmental Protection Act, 1986. ii. Forest Conservation Act, 1980`:` According to this law, the land reserved for forest conservation has been prohibited to use for any other purpose. e.g. For mining activities,it is ESSENTIAL to obtain the permission of the central goverment, failing which the defaulter is entitled to imprisonment for 15 days. iii. Environment Protection Act, 1986 `: ` The mainobjective of this Act is the protection and improvement of the environment and prevention of hazards to HUMAN beings, other living creatures , plantsand property.It safefaurds the environment from pollution and punishes persons or institutes causing harm to the environment. Any person or FACTORY is for bidden by this Act, from releasing pollutants in the atmosphere beyond a certain permissible limit. If a person breaks this rule, he is entitled for either five years of imprisonment or a FINE of upto 1 lakh. iv.In 2010, National Green Tribunal has been established to effectively IMPLEMENT the environment related laws and handle environment disputes. |
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| 75. |
A current of 5 amperes flows through a wire whose ends are at a potential difference of 3 volts. Calculate the resistance of wire. |
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Answer» Solution :GIVEN, Current = 5A, Potential difference = 3V By ohm.s law `V=IxxR` Then, 3 = 5R `I=Q/trArrI=20/40=1/2amp.=0.5amp.` |
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| 76. |
A person with a myopic eye cannot see object beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision? |
| Answer» SOLUTION :CONCAVE LENS | |
| 77. |
Two bodies of masses m and 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is: |
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Answer» ZERO |
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| 78. |
P–V plots for two gagesduring adiabatic process are shown in fig.Plots 1 & 2 should correspond respectively to |
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Answer» `He and O_2` i.e. slope `propgamma` (with - ve sign) So `("slope")_2 gt ("slope")_1 :.gamma_2gt gamma_1` `:.` PLOT 1 correspnds to `O_2 (gamma=1.4)` and Plot 2 corresponds to He `(gamma=1.67)` |
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| 79. |
State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current, (ii) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (iii) current induced in a coil due to its rotation in a magnetic field. |
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Answer» Solution :(i) To KNOW the direction of magnetic field produced around a straight conductor carrying current we use "right-hand thumb rule". For its statement, see Point Number 7 under the HEADING "Chapter At A Glance". (ii) To find the direction of FORCE experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it, we make use of Fleming.s left-hand rule. For statement, see Point Number 13 under the heading "Chapter At A Glance". (ii) For finding the direction of current induced in a coil due to its rotation in a magnetic field we use Fleming.s right-hand rule. For its statement, see Point Number 16 under the heading "Chapter At A Glance". |
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| 81. |
An oxygen cylinder of volume 30 litres has an initial gauge pressure of 15 atm. And a temperature of 27^(@)C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm. And its temperature drops to 17^(@)C. Estimate the mass of oxygen taken out of the cylinder. (R = 8.1 J "mole"^(-1) K^(-1), molecular mass of O_(2) = 32 u). |
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Answer» Solution :`V_(1)=30"litre"=30xx10^(3)CM^(3)=3xx10^(-2)m^(3)` `P_(1)=15xx1.013xx10^(5)N/m^(2)` `T_(1)=300K` `mu_(1)=(P_(1)V_(1))/(RT_(1))=18.3` `P_(2)=11xx1.013xx10^(5)N//m^(2)` `V_(2)=3xx10^(-2)m^(3)` `T_(2)=290K` `mu_(2)=(P_(2)V_(2))/(RT_(2))=13.9` `mu_(2)-mu_(1)=18.3-13.9=4.4` Mass of GAS taken out of CYLINDER `=4.4xx32g` `=140.8g` `=0.140kg` |
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| 82. |
Indicate the following terms related to spherical mirrors in figure: Poles, centre of curvature, radius of curvature, principal focus. |
Answer» SOLUTION :
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| 83. |
Consider a conductor of resistance 'R', length 'L', thickness 'd' and resistivity 'rho'. Now this conductor is cut into four equal parts. What will be the new resistivity of each of these parts ? Why ? |
| Answer» SOLUTION :Resistivity of each part of the conductor will remain UNCHANGED because resistivity DEPENDS on the nature of material only. | |
| 84. |
Solar cooker takes more time as compared to the LPG to boil potato or rice, yet Kunal uses solar cooker for such type of cooking.i) Why does Kunal use solar cooker instead of LPG?, Give reasons for your answer. ii) Name the phenomenon which is responsible for obtaining high temperature in solar cooker. |
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Answer» Solution :a) i) There are no energy losses while cooking on the solar cooker as the food gets cooked in a controlled enivironment, whereas cooking on the LPG leads to maximum percentage of energy loss. ii) Temperature controlled cooking retains the NUTRIENT value of the food III) Using the solar cooker LPG can be served which result in reduction of the emisssion of `CO_2` . iv) It saves a lot of PRECIOUS time which is normally consumed for cooking PURPOSE B) Green house effect |
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| 85. |
Have you seen a photographic camera in which a film is used ? Compare the human eye with it. Ste similarities between them. State the points of difference between them. |
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Answer» Solution :Yes, we have seen a photographic CAMERA in which a film is used. CAMERAS , in general , have various shapes and sizes. Some cameras are much bigger than the human eye while soke are smaller than the human eye. Here we shall consider a SIMPLE camera. Similarities : In the case of a camera as well as the human eye, it is possible to control the amount of incoming light with the help of a diaphragm and an aperture. Both use a convex lens for focusing . The photographic film in a camera is coated with a photosensitive material. The retina in the eye consists of a large NUMBER of light sensitive cells. The photographicfilm in a camera is processed using chemicals and then prints (photographs) can be obtained using the appropriate paper. In the human eye, the electrical signals generated by light sensitive cells are passed by optic nerves to the BRAIN which interprets them . Differences : Cameras come in a variety of sizes and shapes unlike the human eye. Unlike the human eye, a wide variation in exposure time is possible in the case of cameras. The human eye is sensitive in the visible region (red to violet) of the electromagnetic spectrum , whilea much wider range of the electromagnetic spectrum can be covered with cameras designed for specific purposes. In comparison with the human eye, a wider view and range can be covered by a camera. In comparison with the humaneye, a wider intensity (of light) range can be covered with a camera. The retina is indispensible in the human eye, while cameras without a photographic film have been designed with the help of photographic film have been designed with the help of photosensitive materials and are in current use. |
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| 86. |
An echo repeats two syllables. If the velocity of sound is 330 m/s, then the distance of the reflecting surface is |
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Answer» 33 m |
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| 87. |
What is the colourof insulationon the neutral wire coming from the electric board ? |
| Answer» Answer :B | |
| 88. |
What is meant by natural motion ? |
| Answer» Solution :Accordingto Aristotle, A moving body NATURALLY COMES to restwithout any external INFLUENCE of FORCE . Such motions are termedas " NATURAL motion ". | |
| 89. |
Calculate the distance at which an object should be placed in front of a convex lens of focal length 100 cm to obtain an erect image of double its size. |
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Answer» SOLUTION :f=100 CM `m=v/u=2` `v=2U` `1/f=1/v+1/u` `1/100=1/(2u)-1/u` `1/100=(1-2)/24` `=-1/24` `:.2u=-100` `:.u=-50cm` |
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| 90. |
………….. Girls have to unnecessarily face the pooblems like teasingand molestation. |
| Answer» SOLUTION :ADOLESCENT | |
| 91. |
My sister is in habit of keeping the tap open while brushing her teeth. She loves to bathe under shower. My neighbour uses hosepipe attached to drinking water supply pipe for washing his scooter and car. According to me their way of handling the most precious source water is absolutely wrong. On the basis of the above information answer the following questions. (i) Do you agree with me or not? (ii) What changes in the above situation can be done to conserve water. (iii) What values are promoted by me? |
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Answer» Solution :(i) AGREED. (ii) One should minimise use of water, should not KEEP the taps OPEN when not in use, should use bucket of water for cleaning purpose, for taking bath, as these practices consume less water. (iii) Judicious use of resources, environmental FRIENDLY nature. |
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| 92. |
The unit offorce and impulseis same . |
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Answer» |
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| 93. |
Take a bulb, a battery, a switch and few insulated copper wires to the terminals of the battery through the bulb and switch. Now switch on the circuit and observe the bulb. What do you notice ? |
| Answer» SOLUTION :The BULB GLOWS. | |
| 94. |
Sohan went to his town, Agra, 200 km away from Delhi with his father in a car. On the way there was lot of traffic jam. Sohan, after reaching his town, felt nauseated and had a headache because he had inhaled lots of toxic polluted gases. Answer the following questions based on the above information: (i) Which system/part of his body has been affected? (ii) What steps could be taken to reduce air pollution? (iii) What values are exhibited by people? |
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Answer» Solution :(i) Respiratory system/lungs are AFFECTED. (ii) (a) Factories should TREAT harmful wastes and filter it before releasing it in the ENVIRONMENT. (b) Less POLLUTING fuels like CNG should be used in vehicles. (c) REGULAR pollution check and proper service and maintenance should be done for private vehicles. (iii) No regard for environment, disregard for health. |
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| 95. |
A ray of light is incident on a convex mirror as shown. Redraw the diagram and complete the path of this ray after reflection from the mirror. Mark angle of incidence and angle of reflection on it. |
Answer» Solution : TRACING the REFLECTED RAY MARKING `/_i` & `/_r` |
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| 96. |
When electric current passes through a wire , it behaves like a magnet. This is known as : ........... |
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Answer» Magnetic effect of CURRENT |
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| 97. |
A ray of light incident at an angle of incidence i_(1) passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges at an angle of emergence i_(2). (i) How is the angle of emergence 'i_(1)' related to the angle of incidence 'i_(1)' ? (Ii) What can you say about the angle of deviation in such a situation ? |
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Answer» (ii) angle of deviation is MINIMUM. |
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| 98. |
If no external torque acts on a body, will its angular velocity remain conserved ? |
| Answer» SOLUTION :No `OMEGA ALPHA I/I`. | |
| 99. |
Find the equivalent resistance across the ends A and B of this circuit. |
Answer» SOLUTION : `1/(R_(1.2)) = 1/R_1 + 1/R_2= 1/2 + 1/2 + 2/2 =1` `:. R_(1,2 )=1 OMEGA` Similarly `R_(3,4) =1 Omega` `R_(5,6) =1 Omega` `R_(7,8) = 1Omega` Now, `R_(1,2) and R_(3,4)` are connected in SERIES `R_(1,2,3,4) = R_(1,2) + R_(3,4)= 1 + 1 = 2Omega` Also, `R_(5,6) and R_(7,8)` are connected in series `R_(5,6,7,8) = R_(5,6) + R_(7,8) = 1 + 1 = 2Omega` Now, equivalent RESISTANCE `1/R_(eq) = 1/(R_(1,2,3,4)) + 1/(R_(5,6,7,8))` `=1/2 + 1/2=2 /2 =1 ` `:. R_(eq) = 1Omega` |
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| 100. |
Collect the information about Chipko Movement and discuss between two groupsof your class about its importance in present situation. |
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Answer» Solution :i. Chipko movement was initiated in Garhwal Himalayas in 1970, when the local women showed enormous bravery in protecting the trees from THEAXES of contractors by embracing the trees. ii. This movemnet wasorganized in resistance to the destruction of forests. iii. A similar types of movement had occurred in Khejarli village of Rajasthan,in 1731, where 363 Bishnoissacrificied their lives to protect Khejri trees. Presently deforestation has CAUSED adverse imppacts . Such as `: ` a. Loss of biodiversity due to extinction of species. b. Reduced soil FERTILITY and soil erosion. c. Regional and global climatic changes. d. Global warming. v. This movement has inspired numerous people to work on practical programmes to conserve forests and the ENVIRONMENT by activies such as water management, afforestation, RECYCLING waste, etc. |
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