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.
| 6751. |
What will you do if, your sister has become incommunicative and wh prefers to remain alone ? Why ? |
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Answer» SOLUTION :The feeling of stayding alone or not communicating with others may lead to mental stress. This can eventually affect one's physical, mental and social HEALTH. If I find that my sister has become incommunicative and prefers to remain alone, i. I will talk to her and yry to find out the reason for her ALOOFNESS adn the stress. I will discuss her problem and help her find a solution to her problem. ii. I will try to get her to speak with family members and participate in family discussions, family functions, etc. I would also encourage her to pursure her hobbies. This can halp her divert her mind from the ISSUE that are trobling her. III. If required I will advise her to consult a professional counsellor and discuss her problems. |
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| 6752. |
What are the caused or Myopia ? |
| Answer» Solution :Myopia, also KNOWN as SHORT SIGHTEDNESS, occurs DUE to the lengthening of eye ball. With this defect, nearby objects can be SEEN clearly but distance objects cannot be seen clearly . | |
| 6753. |
___________ deals with the motion of bodieswithout consideringthe causeof motion . |
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Answer» FORCE |
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| 6754. |
Solar energy is due to |
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Answer» FUSION REACTIONS |
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| 6755. |
A student uses spectacles of focal length - 2.5 m. Compute the power of this lens. |
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Answer» <P> SOLUTION :`therefore`FOCAL length of LENS F= - 2.5 m`therefore`Power of lens P =`(1)/(f )=-(1)/(2.5) = -0.4 D` |
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| 6757. |
Give scientific reasons for thefollowingstatements : It is improper to use a copperwireas a fuse wire . |
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Answer» Solution :Themeltingpoint of copper is very high. Hence, it may not melteven whena CURRENT through it is morethan the current ratingofthe CIRCUIT . Hence, it is IMPROPER to usea copperwireas a fuse WIRE . |
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| 6758. |
Explain why do stars twinkle but planets do not twinkle. |
| Answer» Solution :SEE SHORT Answer QUESTION Number 14. | |
| 6759. |
A body is thrown vertically upwards and rises to a height of 10m. The velocity with which the body was thrown is (g - 9.8m/(s^(2)) |
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Answer» 10m/s |
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| 6760. |
Explain the process of controlled and uncontrolled chain reactions. |
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Answer» Solution :Controlled chain reaction (i) In the controlled chain reaction the number of neutrons released is maintained to be one. This is ACHIEVED by absorbing the extra neutrons with a neutron absorber leaving only one neutron to produce further fission. (ii) Thus, the reaction is sustained in a controlled manner. The energy released due to a controlled chain reaction can be utilized for constructive purposes (iii) Controlled chain reaction is used in a nuclear reactor to produce energy in a sustained and controlled manner. Uncontrolled chain reaction In the uncontrolled chain reaction the number of neutrons multiplies indefinitely and causes fission in a large amount of the FISSILE material (ii) This results in the release of a huge amount of energy within a FRACTION of a SECOND. (iii) This kind of chain reaction is used in the atom bomb to produce an explosion . |
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| 6761. |
What is the role of fuse used in series with any electrical appliasnce? Why should a fuse with defined rating not be replaced by one with a larger rating? |
| Answer» Solution :Fuse is used for protecting appliances due to short-circuiting or overloading. The fuse is rated for a CERTAIN maximum current and blows off when a current more than the rated value flows through it. If a fuse is replaced by one with larger ratings, the appliances may GET damaged while the protecting fuse does not BURN off. This practice of using fuse of IMPROPER rating should always be avoided. | |
| 6762. |
The melting point of the filament of a bulb is very high. |
| Answer» Solution :The intensity of light emitted by the filament of a bulb depends on the temperature of the filament. It increases with the temperature. (2) The MELTING point of the material used to make the filament of a bulb should be very HIGH so that the filament can be heated to a high temperature by PASSING a current through it, without melting it. This enables us to obtain more light. The melting point of tungsten is very high. HENCE, tungsten is used to make a solenoid type COIL (filament) in an electric bulb. | |
| 6763. |
For which of the following does the center of mass lie out side the body? |
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Answer» Pencil |
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| 6764. |
State important properties (or characteristics) ofmagnetic lines of force around a straight conductor and a circular coil. |
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Answer» SOLUTION :The MAIN properties of magnetic lines of force are: 1.The magnetic lines of force are in the form of concentric circle AROUND the conductor but as their distance from the conductor INCREASES , the curvature of lines of force decreases. 2. The direction of the magnetic lines of force reverses, if the direction of flow of current in the conductor reverses. 3. With the increase of current in the conductor the number of lines of force or the ' intensity of magnetic field also increases. 4. The magnetic lines of force near the wire are nearly circular, especially at the points where the current enters or leaves the coil. 5. At the centre of the coil, the lines of force are almost parallel to each other, showing that the magnetic field at the centre or the coil MAY be considered uniform. 
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| 6765. |
District collector is responsible for designing schemes for each district and getting them sanctioned by the state level authorities. |
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Answer» |
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| 6766. |
C_(12)H_(22)O_(11) underset(Delta)overset("heat")to 12C+11H_(2)O : Decomposition reaction :: H_(2)O + CO_(2) to H_(2)CO_(3) : ________ |
| Answer» SOLUTION :COMBINATION REACTION | |
| 6767. |
Concave mirrors A and B each focal length - 15 cm. Concave mirror A has a larger aperture than B. Which of these will form a sharper image ? Why ? |
| Answer» Solution :APERTURE determines the AMOUNT of LIGHT received by the spherical mirror : A spherical mirror forms a sharp image, when its aperture is small when compared to its focal LENGTH. THEREFORE concave mirror B will form a sharper image. | |
| 6769. |
The diagram below shows a lever in use. (a) To which class of lever does it belong ? Give one example of this class. (b) How will the mechanical advantage of lever change if load is shifted towards the fulcrum without changing it's dimensions. |
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Answer» Solution :(a) The fulcrum F is in between the LOAD and the EFFORT, so it is a class I lever. A pair of pliers is an example of class I lever. (b) The mechanical ADVANTAGE of the lever would increase if load is SHIFTED TOWARDS the fulcrum without changing its dimensions. |
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| 6770. |
Which of the following is used as a moderator in the reactor of a nuclear power station ? |
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Answer» LIQUID sodium |
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| 6771. |
While performing an experiment on determining the focal length of a convex lens, a student obtains a sharp inverted image of the laboratory window grill on the screen and measures the distance between the screen and the lens. She then repeats the experiment and takes a distant tree as the object in the second case. In order to get a sharp image of the tree on the screen, she will now have to move the screen : |
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Answer» slightly nearer to the lens |
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| 6772. |
(a) Draw a diagram to represent a uniform magnetic field in a given region (b) List two properties of magnetic field lines |
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Answer» Solution :(a) Equidistant parallel lines INDICATE a uniform magnetic FIELD in a given region `rarr` `rarr` `rarr` `rarr` (b) PROPERTIES of magnetic field lines are : The magenetic field lines of a magnet form CONTINOUS closed loops i.e. outside the magnet they emerge from north pole and merge at the south pole and INSIDE the magnet, the direction of field lines is from its south pole to its north pole The degree of closeness of field lines indicates the strength of magnetic field. Field lines never cross each other |
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| 6773. |
Why does a car parked in sunlight remains hot from inside even when there is no sunlight in the car? |
| Answer» Solution :The glass windows have the peculiar property to PASS radiations which have wavelength near to the visible light or shorter wavelength. It does not allow infra-red radiations of HIGHER wavelength. Since the SUN sends infra-red radiations of lower wavelengths, it gets trapped inside the car in the form of heat. This heat or infra-red radiations can not pass out and THUS gets trapped in the car for longer time, making it hot from inside. | |
| 6775. |
A charge q is located at the centre of a cube. The electric flux through any face is |
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Answer» `(pi Q)/(6 (4PI in_(0)))` |
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| 6776. |
What is the difference in colours of the sun observed during sunrise/sunset and noon ? Give explanation for each. |
| Answer» Solution :Blue colour is scattered the most and RED colour the LEAST by air molecules and particles in the earth.s atmosphere. At noon, only little blue and violet colours are scattered and hence, the sun appears WHITE. At sunrise or sunset, sunlight passes through a longer distance in the atmosphere. EN route, blue colour [shorter wavelength] would have been mostly removed by scattering leaving behind red colour [longer wavelengths] which reaches our yes. Thus, at sunset or sunrise, the sun appears REDDISH in colour. | |
| 6777. |
How electic energyisproduced ? OR Explain how an energy source, a turbine and a generator are used to produce electric energy. |
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Answer» Solution :(i) Electricityis generated at a power atation using an ENERGY source , a turbine and a GENERATOR. (ii) The energysouce is used to drive the turbine. (III) A turbine has BLADES. A flow of liquid or gas is directed on these bledes of the rurbine , which causes them to ROTATE. (iv)The turbinewhich in turn is connected to an electric generator causes the magnet in the electric generator causes the magnet in the electric generator causes the magnet in the electric generator to rotate and electric energy is produced. |
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| 6778. |
How many electrons are passing per second in a circuit in which there is a current of 5 A ? |
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Answer» Solution :Current `I=5A` Time (t) = 1 second CHARGE of electron `E=1.6xx10^(-19)C` `I=q/t=("ne")/(t)` NUMBER of electron, N `=("It")/(e )` `=(5xx1)/(1.6xx10^(-19))` `n=3.125xx10^(19)` |
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| 6779. |
The temperature of interior of Sun is about |
| Answer» Solution :`1.4 xx 10^(7)K` | |
| 6780. |
If the radiation exposure is 100R, it may cause______________. |
| Answer» SOLUTION :FATAL DISEASE | |
| 6781. |
Compare the power used in the 2 Omegaresistor in each of the following circuits: (i) a 6 V battery in series with 1 Omega and 2 Omegaresistors, and (ii) a 4 V battery in puallel with 12 Omega and 2 Omega resistors. |
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Answer» <P> SOLUTION :(i) (II) ` R= 1+2=3 Omega` `I = (6)/(3) = 2 A ` `P =I^(2) R = (2)^(2) xx2=8 W ` `P =(V^(2))/(R)` `((4)^(2))/(2) = (4xx4)/(2) = 8 W` 
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| 6783. |
Which uses more energy, a 250W TV set in 1hour or a 1200W toaster in 10 minutes? |
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Answer» Solution :ENERGY used by a TV set of power `P_1=250W` in TIME `t_1= 1h` `E_1=p_1t_1=250W times 1h=250Wh` and energy used by a toaster `P_2=1200W`in time `t_2=10 min=10/60 H=1/6 h` `E_2=P_2t_2=1200W times 1/6h=200Wh` THUS, it is evident that TV set has used more energy. |
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| 6784. |
Which of the folowing statement is correct ? |
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Answer» A PERSON with myopia can see DISTANT objects clearly |
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| 6785. |
Whosemagneticfieldresembles the magneticfieldof a current - carryingsolenoid ? |
| Answer» SOLUTION :A BAR MAGNET | |
| 6786. |
Assertion (A): Sky predominantly appears light blue on account of scattering of light. Reason (R): Wavelength of blue light is least. |
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Answer» Both (A) and (R) are true and (R) is CORRECT explanation of the assertion. |
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| 6787. |
(a) Solar cells are used to provide the electric current to charge the batteries of a car driven by an electric motor. Describe the energy changes which take place. (b)What differences would you expect in the charging of car batteries (i) in bright sunlight (ii) on a cloudy day (iii) at night ? |
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| 6788. |
The velocity which issufficientto just escapefrom the gravitational pull of the Earth is calledvariablevelocity . |
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| 6789. |
Nuclear Fusion: Extreme temperature :: Nuclear fission: ________________ |
| Answer» SOLUTION : ROOM TEMPERATURE | |
| 6790. |
What is forest fire? What is its effect on environment? |
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Answer» Solution :a. Forest fire is an UNCONTROLLED fire that SPREADS with tremendous speed over a large AREA in a forest, pasture or grassland. b. For destructive effects of forest fire. |
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| 6791. |
By convention, the direction of current is opposite to the direction of ___________. |
| Answer» SOLUTION :FLOW of ELECTRONS | |
| 6792. |
_________ is used for the effective functioning of heart. |
| Answer» SOLUTION :RADIO SODIUM (`NA^(24)`) | |
| 6793. |
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it ? |
| Answer» SOLUTION :The MIRROR is a CONVEX mirror. | |
| 6794. |
Describe the construction and working of compound microscope. |
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Answer» Solution :Construction: i. COMPOUND microscope consists of two convex LENSES called objective (0) and eyepiece (E). ii. The objective has smaller aperture and smaller focal length as compared to eyepiece. iii. The two lenses are placed coaxial inside a hollow metallic tube such that the distance between them can be changed. Working: i. Any object, which is to be magnified, is placed in FRONT of objective lens. ii. The image formed by the objective lens acts as an object for the eyepiece as shown in figure.  iii. The image formed by objective is real, inverted and formed at a distance within the focal length of eyepiece. iv. Hence, the eyepiece forms a virtual, inverted and highly magnified image of the object. V. As a combined effect of two lenses, higher magnification is obtained in compound microscope. This is used to observe minute object or minute LIVING organisms. |
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| 6795. |
(a)Why do we need to manage our resources carefully ? (b)Why management of natural resources requires a long term perspective ? |
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Answer» SOLUTION :(a) The resources are limited and with a tremendous increase in human population , the demand for resources is increasing at an exponential RATE . Therefore , we need to manage them carefully. (b)Long term perpective is required to meet the NEEDS of the present as WELL as for the generations to come . |
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| 6796. |
Children are facing the problems of loneliness and mental stress due to joint family. |
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Answer» Solution :False. CHILDREN are facing the problems of LONELINESS and MENTAL stress DUE to NUCLEAR family. |
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| 6797. |
How can we measure potential difference or emf ? |
| Answer» SOLUTION :With the HELP of a VOLMETER, we measure POTENTIAL DIFFERENCE or emf. | |
| 6798. |
Take two eggs and drop them from a certain height one by one . Drop one egg onto a concrete floor and another oneonto a cushion pillow . What changes do you notice ? When the egg is droppedonto a concrete floor , it breaks. But , the egg is dropped onto the cushion pillow . What changesdo you notice ? When the egg is dropped onto a concrete floor , it breaks . But , the egg dropped onto the cushion pillow does not break . Can you explain why ? |
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Answer» Solution :(i) Egg dropped on concrete : A largeforce acting for a short period of time and a SMALLER force acting for a longerperiod time . Egg dropped on CUSHION pillow : A smaller force acting for a longerperiod . (ii) In this activity for the egg dropped to a cushion pillow , the time of interaction of forceis large and makesthe magnitude of force small. (iii) So , it does not break . When the same egg is dropped ontoa concrete FLOOR , the time of interaction is very short and hencethe force becomeslarge , which breaks the egg . (IV) Such a forceis known as " IMPULSIVE force " . |
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| 6799. |
If the mass of the fissile material is more than the critical mass is termed as ________. |
| Answer» SOLUTION :SUPERCRITICAL | |
| 6800. |
Formation of rainbow is the combined effect of ………… , refraction and ………..Of lihgt. |
| Answer» SOLUTION :DISPERSION, TOTAL INTERNAL REFLECTION | |