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.
| 5901. |
Fill in the following blanks with suitable words : (a) Splitting of a heavy nucleus into two lighter nuclei is called…………..(b) Uranium-235 atoms will split when hit by………….This is called…………..(c ) Nuclear…………..is used in nuclear power stations for the production of electricity.(d) In a nuclear power station, nuclear fission takes place in the............ |
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| 5902. |
From the elements Li, K, Mg, C, Al, S identify the element which prefers sharing of electrons to complete its octet. |
| Answer» Solution :C prefers SHARING of electrons to complete its octet. | |
| 5903. |
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy? [Hint : kinetic energy K = p^(2)//2m where p is the momentum) |
| Answer» SOLUTION :Lightermass | |
| 5904. |
Carbon atom does not form C^(4-) cation and C^(4+) cation. Why? (ii) How can ethanol be eonverted into ethanoic acid? |
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Answer» Solution :Carbon can gain four CLECTRONS. But it would be difficult for the nucleus with six protons to hold on to ten clectrons, tlhat is lour extra electrons. It can lose four electrons but it would require a large amount of energy to remove four electrons leaving belhind a carbon calion with SIX protons in its nucleus holding on to just two eleetrons. Alkaline potassium permangnate or acidified potassium dichromate is added to ethyl alcohol. When it is heated it oxidises to fomr ethanoie acid. `CH_(3)- CH_(2)-OH UNDERSET("AciditK"_(2)Cr_(2)O_(7)+"Heat")overset("Basic KmnO4+Heat")rarr CH_(3)COOH` |
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| 5907. |
From the elements Li, K, Mg, C, Al, S identify the element which has the tendency to lose two electrons. |
| Answer» Solution :MG has a tendency to LOSE two ELECTRONS. | |
| 5908. |
Choose the correct option.The magnetic field inside a long straight solenoid carryingcurrent . |
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Answer» is zero |
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| 5909. |
Name the form of mechanical energy, which is put to use for doing work. |
| Answer» SOLUTION :KINETIC ENERGY | |
| 5910. |
Explain Presbyopia using the following points- (a) Other name for Presbyopia. |
| Answer» Solution :(a) PRESBYOPIA is also called as old AGE HYPERMETROPIA. | |
| 5911. |
Resistance of an incandescent filament of a bulb is comparatively much more than that when it is at room temperature. Why? |
| Answer» Solution :The rise in temperature CAUSES a rise in the VIBRATION of the atoms in the filament, increasing the collision between the atoms and the flowing ELECTRONS. The INCREASE in collision decreases the RATE of flow of electrons and hence increases the resistance. | |
| 5912. |
Give the law of combination of resistances in parallel and draw a circuit diagram containing three resistors connected in parallel. |
Answer» SOLUTION :When two (or more) resistances and one SOURCE are connected between the same two points, they are SAID to be connected in PARALLEL (SEE figure) 
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| 5913. |
One cal heat : |
| Answer» SOLUTION :The amount of heat necessary to raise TEMPERATURE of 1 g of water by `1^@C` from `14.5^@C` to `15.5^@C` is called one cal heat. | |
| 5914. |
State Charle's law (or) write the law of volume. |
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Answer» Solution :(i) When the pressure of gas is kept CONSTANT, the value of a gas is directly PROPORTIONAL to the TEMPERATURE of the gas. (ii) CHARLES's law : `[v prop T (or) (V)/(T) = "constant"]` |
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| 5915. |
A torch bulb is rated 5 V and 500 mA. Calculate its (i) power, (ii) resistance, (iii) energy consumed when it is lighted for 4 hours. |
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Answer» <P> Solution :(i) P= VI `=5xx0.5= 2.5 ` Watt(ii) `R= (V)/(I)= (5)/(0.5) = 10 Omega` (iii ) `W= P xxt = 2.5xx4 xx3600` `=36000= 3.6 xx10^(4) J` |
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| 5916. |
Figure below shows a lever in use. (a) To which class of lever does it belong ? (b) If AB=1m, AF=0.4m, find its mechanical advantage. (c) Calculate the value of E. |
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Answer» (b) 1.5 (c) 10 kgf |
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| 5917. |
The relation below absoluteunits of force on MKS and C.G. S system is 1 N= 10^(5)dyne. |
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| 5919. |
In a village in Karnatka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the waterbody was completely covered with green floating plants and fishes started dying in large numbers. Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake. |
| Answer» Solution :As many FERTILISERS contain phosphates and nitrates, the water body bacome enriched with these chemicals. This enriches the nutrients in water leading to excessive growth of small, green, aquatic plants and the surface of water was completely covered with plants (eutrophication). These small plants consume most of the dissolved OXYGEN of the water leading to its deficiency. Due to this, the fishes and the other aquatic life in the lake die because of oxygen starvation and DEPLETION of LIGHT. | |
| 5920. |
The unit of decay constant is |
| Answer» Solution :`"second"^(-1)` | |
| 5921. |
Soda bottles are made of thick glass so that they can withstand the |
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Answer» PRESSURE in SUMMER |
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| 5922. |
What are the applications of convex lens ? |
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Answer» Solution :(i) Convex lenses are USED as camera lenses (II) They are used as magnifying lenses (III)They are usedin MAKING microscope , telescope and slide PROJECTORS (iv) They are used to correct the defect of vision called hypermeteropia |
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| 5923. |
Two particles mass 100g and 300g at a given time have velocities 10hati - 7hatj - 3hatk and 7hati - 9hatj + 6hatk ms^(-1) respectively. Determine velocity of COM. |
| Answer» SOLUTION :Velocity of COM `=(31 i- 34 j + 15 K)/4 ms^(-1)` | |
| 5924. |
X- ray should not be taken often'. Give the reason. |
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Answer» Solution :(i) Radiation does involved in X-rays tests and ISOTOPE scans (in nuclear medicine) are too low to cause immediate HAZARDOUS effects. (ii) If should be taken often, X-ray radiation from medical examinations though slightly increases one.s RISK for CANCER which can occur year or DECADES after X-ray exposure. |
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| 5925. |
Spent slurry produced after producing gobar gas is : |
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Answer» USELESS residue |
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| 5926. |
What happens if you lift your tube slightly above the table? |
| Answer» SOLUTION :If we LIFT the tube SLIGHTLY we cannot HEAR the SOUND clearly. | |
| 5928. |
A student, holding a mirror in his hand, directed the reflecting surface of the mirror towards the sun. He then directed the reflected light on to a sheet of paper held close to the mirror. (a) What should he do to burn the paper ? (b) Which type of mirror does he use ? (c) Will he be able to determine the approximate value of focal length of this mirror from this activity ? Give reason and draw ray diagram to justify your answer in this case. |
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Answer» SOLUTION :(a) The student should adjust the distance between the MIRROR and the paper so that solar rays are sharply FOCUSSED on the paper. (b) The mirror is a concave mirror. (c) The student can find the approximate FOCAL length by measuring the distance between the papaer and the mirror. As shown in Figure, parallel rays from the sun are focussed on the paper at point A. in focal plane of mirror such that PB. = f. 
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| 5929. |
Which of the following does NOT cause mental stress ? |
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Answer» Gender discrimination |
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| 5931. |
Define the term pollination. Differentiate between self pollination and cross pollination. What is the significance of pollination ? |
Answer» Solution :The transfer of pollen grains from anther to stigma is termed pollination. Significance : It RESULTS in FERTILISATION, which is RESPONSIBLE for FORMATION of next generation and HENCE continuation of species. |
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| 5932. |
The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be |
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Answer» `PV=(5RT)/(32)` |
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| 5933. |
Observe the diagram given and answer the question asked. d. What is the effect of lens used while correcting the defect. |
| Answer» Solution :The lens used will DIVERGE the INCIDENT rays before they ENTER the lens. | |
| 5934. |
a) Why do ionic compounds have high melting points ? b) Write the equation for the reaction of i) Iron with steam ii) Calcium and potassium with water. |
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Answer» Solution :In the formation of ionic compounds, positive ions and negative ions PRECIPITATE. These are closely packed and the ionic compounds exist as crystalline solids. They have strong inter - ionic process of ATTRACTION and have high metling and BOILING POINTS. i) `3Fe + 4H_(2)O to FC_(2)O_(4)+H_(2)` ii) `Ca+2H_(2)O toCa(OH)_(2)+ H_(2)` `2K + 2H_(2)O to 2KOH+H_(2)` |
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| 5935. |
What is the maximum resistance which can be made using five resistors each of 1/5 Omega? |
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Answer» `1/5 Omega` |
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| 5936. |
Explain the role of district disaster control unit after occurrence of any disaster. |
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Answer» Solution :i. The district disater control units gets into action immediately after the impact of a DISASTER or as soon as it gets an intimation about an upcoming disaster. ii. Its respnsibilities include review of various aspects of disaster and maintaining contacts with various agencies LIKE army, navy, AIR force, telecommunicastion department, paramilitary forces, etc, for getting help. iii. It also COORDINATES with various voluntary organizations and TAKES their help and assistance in disaster management. |
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| 5937. |
List four specific characteristic of the images of the objects formed by convex mirrors. |
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Answer» Solution :Four specific characteristics of the IMAGE formed by CONVEX mirror: (i) It is always formed BEHIND the mirror, between the pole and its focus. (ii) The image is always VIRTUAL and erect. (III) The size of image is always smaller than the object. (iv) Magnification is always positive. |
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| 5938. |
State the factors on which the position of centre of mass of a rigid body depends. |
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Answer» Solution :(i) Shape of BODY (II) MASS DISTRIBUTION. |
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| 5939. |
A compass needle is placed near a current - carrying straight wire . Stateyour observation for thefollowingcase and givereason for the samein each case : (1) Direction of electriccurrent in the wireis increased . (2) Magnitudeof electriccurrentin the wireis increased . (3) Teh compass needleis displaced away from the straight wire . |
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Answer» Solution :(1) Deflectionof thecompass needlechanges. BECAUSETHE DIRECTIONOF the magnetic fielddue toa currentis dependent on thedirectionof thecurrentand hence the deflection of the compass needle change . (2) Deflection of the compass needleat a givepoint increase . (3) Deflection of the compass needlefor a GIVEN currentdecreases. Because magnetic fieldstrenghtis inverselyproportional to thedistancefrom the WIRE . |
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| 5940. |
Which phenomenon is responsiblefor increasing the apparent length of the day by 4 minutes ? |
| Answer» SOLUTION :ATMOSPHERIC REFRACTION. | |
| 5941. |
Angular velocity of hour hand of a watch is |
| Answer» Solution :`omega=(2PI)/(12)=(pi)/(6)"rad H"^(-1)`. | |
| 5942. |
How is the refractive index of a medium related to the speed of light ? Obtain an expression for refractive index of a medium with respect to another in terms of speed of light in these two media ? |
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Answer» Solution :If medium 1 is VACUUM or AIR medium 2 is GLASS, then the refractive INDEX of medium 2 considered with respect to vacuum or air is represented as `mu_(21)=mu_(ga)=mu_("glass")` Then `mu_(21)` is the ABSOLUTE refractive index of medium 2. Hence `mu_("glass")=("speed of light in air / vacuum")/("speed of light in medium 2 (say glass)")=(c )/(v_(2))` If we consider a light ray travelling from medium 2 to medium 1, refractive index of medium 1 with respect to medium 2 `= mu_(12)`. `mu_(12)=("speed of light in medium 2")/("speed of light in medium 1")=(v_(2))/(v_(1))` |
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| 5943. |
SI unit of heat is ___________. |
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Answer» calorie |
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| 5944. |
The diagram in Fig.1.34 shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the points A and B respectively of the metre rule such that OA= 40cm and OB=20cm . Calculate (i) the total anticlockwise moment about O, (ii) the total clockwise moment about O, (iii) the difference of anticlockwise and clockwise moments, and (iv) the distance from O where a 100gf weight should be placed to balanced the metre rule. |
| Answer» Solution :(i) 6000 gf CM (II) 5000 gf cm (iii) 1000 gf cm (IV) 10cm on the RIGHT side of O | |
| 5945. |
Stae one main difference between A.C and D.C. Why A.C is preferred over D.C for long range transmission of electric power ? Name one source each of D.C and A.C ? |
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Answer» Solution :Difference between A.C and D.C : The Alternating Current (A.C) reverses its direction periodically. Whereas the DIRECT current (D.C) always flows in one direction. A.C is preferred over D.C because it can be transmitted over long distance WITHOUT MUCH loss of ENERGY. D.C source : Battery, A.C source : A.C generator |
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| 5946. |
Suggest a few useful ways of utilising waste water. |
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Answer» Solution :Some usefull ways of utilising WASTE WATER are as follows (i) For recharging the ground water. (ii) For irrigation. (iii) TREATED municipal water can be used for washing cars, watering gardens etc. (IV) Waste water from the kitchen can be collected and reused in toilet flushing. (v) Certain pollutants in municipal water can BECOME fertiliser for various crops. |
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| 5947. |
What are the advantages and dis- advantages of using a solar cooker? Are there places where solar cooker would have limited utility? |
| Answer» Solution :Solar cooker uses Sun.s energy to cook food stuff. It is inexhaustable, clean and RENEWABLE source of energy. It is free for all and AVAILABLE in unlimited amount. Hence, operating a solar cooker is not expensive. Disadvantages of a solar cooker is that it is very expensive. It WORKS only in sunlight . Hence on cloudy day, it becomes USELESS. The places where the days are too short or places with cloud covers round the year have limited utility for solar cooker. | |
| 5948. |
At which position will you keep an object in front of a convex lens to get a real image of the same size as the object ? Draw a figure . |
Answer» Solution :To get a REAL image of the same size as the object, the object should be PLACED at a distance EQUAL to twice the focal length of the lens i.e., at a POINT `2F_(1)` from the lens as shown in the ray diagram. 
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| 5949. |
A student was given three resistances of 5 Omega,2 Omega and 3 Omega He experimentally obtained the equivalent resistance of their series combination. The correct value will be: |
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Answer» `0.9 Omega` |
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| 5950. |
What is Artificial Radioactivity (or) Induced Radioactivity ? |
| Answer» Solution :The PHENOMENON by which EVEN LIGHT elements are made RADIOACTIVE, by artificial or induced METHODS, is called .artificial radioactivity. or .man-made adioactivity.. | |