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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.
| 7801. |
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2V each, a5 Omega resistor , and 8 Omega resistor and a 12 Omega resistor and a plug key, all connected in series. |
Answer» SOLUTION :The SCHEMATIC DIAGRAM of the CIRCUIT is SHOWN in Fig.12.1 
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| 7802. |
What is the amount of radiation that may cause death of a person when exposed to it ? |
| Answer» SOLUTION :When the body is exposed to about 600 R, it LEADS to death, | |
| 7803. |
What are positive and negative acceleration in straight line motion? |
| Answer» Solution :If SPEED of an object INCREASES with time, its acceleration is POSITIVE. (Acceleration is in the direction of MOTION) and if speed of an object decreases with time its acceleration is NEGATIVE (Acceleration is opposite to the direction of motion). | |
| 7804. |
George Simon Ohminvented electrochemicalcell |
| Answer» SOLUTION :ALESSANDRO VOLTA | |
| 7805. |
Explain different ways to induce current in a coil. |
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Answer» Solution :There are mainly two methods to induce the current in a coil. 1. By relative motion between coil and a magnet.  When the magnet is stationary [at rest as in FIG. (a)], the induced current is produced. When magnet is falling with N-pole of magnet towards coil, deflection is as shown in Fig. (b). Direction of the current gets reversed when N-pole is moving up (going AWAY from coil) as shown in Fig. (c ). Faster the magnet moves, more the deflection and hence current in galvanometer. Deflection produced by the current is same when N-pole is moving down [Fig. (d)] or when south pole is moving up [Fig. (e)]. Current and hence deflection in the galvanometer will be again produced if magnet is kept at rest and coil is MOVED. 2. By changing current in the neighbouring circuit. Take a non-conducting cylindrical tube (say made from thick paper). wind two set of coils I and II on it as shown, CONNECT a battery and a key to coil I and a galvanometer to coil II. When key is inserted in K, there will be an instantaneous deflection in galvanometer even though there is no CELL in this circuit. Take out the key from plug K. An instantaneous large deflection in opposite direction  to previous deflection will be produced in galvanometer. Thus current has been induced in coil II due to increase or decrease of current in coil I. |
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| 7806. |
Absolute humidity and relative humidity. |
Answer» SOLUTION :
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| 7807. |
What are the functions of the District Collector in disaster management? |
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Answer» Solution :i. The district collector is responsible for pre-and post-DISASTER management as well as implementation of REHABILITATION schemes at the district level. ii. He plans, coordinates and controls the implementation of rehabilitation PROGRAMME, gives out necessary instructions and reviews the entire SYSTEM. iii. He also designs separate schemes for DIFFERENT types of disaster in each district and gets those sanctioned from state-level authorities. |
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| 7808. |
Galileostated that , the ___________ of all Earthly bodiesis at rest . |
| Answer» SOLUTION :NATURAL STATE | |
| 7809. |
(i) What is solar cell panel ? (ii) Name any two elements that are used for making solar cell panels. |
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Answer» Solution :(i) A combined arrangement of a large NUMBER of SOLAR cells that can deliver SUFFICIENT electricity for practical use is known as solar CELL panel. (ii) Silver, SILICON. |
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| 7810. |
Diploblastic |
| Answer» Solution :A CONDITION in which there are two germ layers, VIZ, ECTODERM and endoderm is CALLED diploblastic. | |
| 7811. |
What happens if a current carrying conductor is placed in magnetic field ? |
| Answer» SOLUTION :It EXPERIENCES a force given by Fleming.s left hand rule. | |
| 7812. |
Properties of Ionic compound |
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Answer» Solution :(1) ionic comopound are SOLIDS and hard due to strong ELECTROSTATIC force of attraction between oppositely charged ions. (2) They are generally brittle. When pressure is applied they break into pieces. (3) They have high melting and boiling points, due to intermolecular force of attraction is high in ionic compounds. (4) They are soluble in water and insoluble in SOLVENTS such as keerosen and petrol (5) Ionic compounds cannot conduct ELECTRICITY when in SOLID state, they are electrically netural. They conduct electricity in the molten state and also in an equeous solution. |
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| 7813. |
Activities under the jurisdication of cyber crime laws. |
| Answer» Solution :Hacking of INFORMATION, video piracty, SENDING derogatory messages, cyber bullying, introducing COMPUTER viruses, sending vulgar pictures, EXCHANGE of information and phone number, etc.Areactivities under the jurisdiction cyber CRIME laws. | |
| 7814. |
I have chitinous exoskeleton , I have four pairs of walking appendages . I can sting you. Who am I ? What phylum do I belong to ? |
| Answer» SOLUTION :SCORPION . PHYLUM ARTHROPODA. | |
| 7815. |
Name any two sources of direct current. |
| Answer» SOLUTION :Some SOURCES of direct CURRENT are CELL, BATTERY and DC generator. | |
| 7816. |
Whay is the earth pin longer and thicker thanlive and neutralpins ? |
| Answer» Solution :The earth pin is made LONGER and THICKER than live and neutral pins so that it cannot ENTER into the POSITION of live and neutral pins in the socket. This ensures that earth pin is always connected at theproperplace and the user is protected from the possibility of an ELECTRIC shock. | |
| 7817. |
Why are we looking at alternate sources of energy ? |
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Answer» Solution :We are LOOKING at alternative sources of energy MAINLY DUE to two reasons : (i) because the fossil fuels and NUCLEAR fuels present in the earth are limited which may not last for long, and (ii) because of the undesirable effects of pollution both from the burning of fossil fuels and from the radioactive wastes of the nuclear power plants. |
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| 7818. |
The sound waves are reflected from an obstacle into the same medium from which they were incident .Which of the following changes ? |
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Answer» SPEED |
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| 7819. |
In a village people burn wood and cow dung as fuel for basic necessity. In another nearby village, people have a bio-gas plant in which bio waste is used to prepare bio gas which is supplied to all the houses of the village. Answer the following questions based on the situation given above. (i) If we compare the situation of both villages, which practice is the best and why? (ii) What values are promoted by each village? (iii) Suggest some other ways that can be employed for saving resources? |
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Answer» Solution :(i) The practice of the second village is the best because they are employing a less polluting and less expensive way of fuel generation. (ii) The first village is promoting no CONCERN for the ENVIRONMENT, ignorance and no technological development. The second village is promoting environmental concern, judicious use of resources and sharing. (iii) Renewable sources of energy like CNG (COMPRESSED Natural GAS) can be used in vehicles, solar energy can be used in place of electricity. |
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| 7821. |
Define radioactivity. What are radioactive elements ? |
| Answer» SOLUTION :The PHENOMENON of NUCLEAR decay of certain elements with the emission of radiations like alpha, beta, and gamma RAYS is called .radioactivity | |
| 7822. |
What is secretory phase of menstrual cycle? |
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Answer» Solution :The four phases of the MENSTRUAL CYCLE are: (a) Menstrual or Destructive phase (b) Follicular or PROLIFERATIVE phase (c) Ovulatory phase (d) Luteal or SECRETORY phase Events of menstrual cycle and changes in ovary and changes in UTERUS. 
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| 7823. |
Selwyn is 16 yr old and wears a spectacle having a power of +2 D. Answer the following questions: Name the eye defect he has. |
| Answer» SOLUTION :HYPERMETROPIA. | |
| 7824. |
The radio isotope of ____________ helps to increase the productivity of crops. |
| Answer» SOLUTION :PHOSPHOROUS (P-32) | |
| 7825. |
What is meant by (a) 'Total internal reflection? (b) State two essential conditions for total internal reflection to take place. (c) With the help of a ray diagram, illustrate an application of total internal reflection. |
Answer» Solution :When LIGHT passes from one medium to other, it BENDS from its path which is called refraction. When a light ray passes from denser to rarer medium, at some angle of incidence it does not GO out of the denser medium but just grazes along the boundary (i.e. angle of refraction = `90^(@)`). This angle of incidence is called critical angle.  Now, if you increase this angle of incidence, light ray is reflected BACK into the denser medium, which is called total internal reflection. The light ray is reflected everytime it hits the boundary because angle of incidence is equal to angle of reflection, and is not able to come out of the medium. This phenomenon is called total internal reflection. The conditions for total internal reflection are: (i) the light ray MUST be travelling from optically denser medium to rarer medium and (ii) the angle of incidence must be greater than the critical angle. Optical fibres communication uses the principle of total -internal reflection for transferring data through optical fibres.. |
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| 7826. |
A circuit has a line of 5 A. How many lamps of rating 40W, 200V can simultaneously run on this line safely ? |
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Answer» Solution :GIVEN V= 200 V,P = 40 W , I = 5A N= ? mP = VI `n=(VI)/(P) = (200xx5)/(40)` `=(100)/(4)= 25` lamps `:. 25` Lamps . |
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| 7827. |
Draw the pattern of magnetic field lines around a current-carrying straight conductor. How does the strength of the magnetic field produced change : (i) with the distance from the conductor ? (ii) with an increase in current in a conductor ? |
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Answer» Solution :The PATTERN of magnetic field lines has been shown here. The field pattern CONSISTS of closed circular paths around the CURRENT-carrying conductor. (i) The strength of the magnetic field PRODUCED decreases with increase in distance from the current-carrying conductor. (ii) The strength of magnetic field INCREASES on increasing the current flowing in a conductor. |
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| 7828. |
Images formed by a concave lens are always : |
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Answer» REAL |
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| 7829. |
Natural selection is a driving force for evolution-How ? |
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Answer» Solution :a) ANTERIOR and Posterior ends of the body are provided with suckers by which the animal attaches itself to the body of the host. (b) The three Jaws, inside the mouth, auses a painless Y-shaped wound in the skin of the host. (c) The salivary glands produce Hirudin, which does not allow the blood to coagulate. So,the continuous supply of blood is maintained. (ii) Darwin published his observations under the name "origin of species". It elaborates on the theory of natural selection for evolutionary transformation. The principles of Darwinism tells that natural selection is a driving force for evolution 1. Overproduction: Living beings have the ability to reproduce and have the capacity to multiply in a geometrical manner. 2. Struggle for existence: Due to overproduction a geometric ratio of increase in population occurs. The space to LIVE and food available for the ORGANISMS remain the same. This creates a competition among the organisms, for food and space, leading to struggle. (a) The competition may be among the individuals of the same species (Intraspecific struggle) (b) Competition between the organisms of different species living together (INTERSPECIFIC struggle). (c) Natural conditions like extreme heat or cold drought and floods can affect the existence of organisms (Environmental struggle). 3. VARIATIONS: Small variations are important for evolution. According to Darwin, favourable variations are useful to the organisms and unfavourable variations are harmful or useless to the organisms. 4. Survival of the fittest or Natural selection: During the struggle for existence, the organisms which can overcome the challenging situation,survive and adapt to the surrounding environment. Organisms, which are unableto face the challenges, are unfit to survive and disappear. The process of selection of organisms with favourable variation is called as Natural selection. 5. Origin of species: According to Darwin, new species originates by the gradual accumulation of favourable variations for a number of generations. |
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| 7830. |
Which disasters have you experienced I your area? |
| Answer» Solution :FLOODING is a commonly encountered DISASTER in the CITY due to HEAVY rains. | |
| 7831. |
Draw a concept diagram to show anaerobic respiration in different living organisms : Anaerobic respiration in living organisms/ cells . |
Answer» SOLUTION :
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| 7832. |
Shekhar had to go for an important meeting and it was raining heavily. He was getting too late. While driving his car, he saw from his side mirror that the car which was behind his car had met an accident. He suddenly applied the brake to help the injured person though he was getting late for his meeting. He alone took the person to the nearest hospital. The person got the treatment at the right time and his life was saved. Answer the following questions based on the situation given above. (i) Name the type of mirror from which Shekhar saw the accident. (ii) Why this particular mirror is used as a side mirror in vehicles? (iii) What values are being reflected by Shekhar? |
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Answer» Solution :(i) The mirror is convex mirror. (ii) Convex mirror is used as a side mirror in vehicles because it ALWAYS give an erect, though diminished image and it has a wider field of view as it is curved OUTWARDS. THUS, it enables the DRIVER to view much larger AREA than a plane mirror. (iii) Helpfulness, kindness. |
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| 7833. |
Species diversity refers to the innumerable speciesof organisms that occur in nature. |
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| 7834. |
Refractive index of water is 4//3 and speed of light in air is 3xx10^(8) m//s . Find speed of light in water. |
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Answer» Solution :Given : `""_(1)n_(2)=(4)/(3),v_(1)=3xx10^(8)`m/s TOFIND :`v_(2)` FORMULA : `""_(1)n_(2)=(v_(1))/(v_(2)` Solution : `""_(1)n_(2)=(v_(1))/(v_(2)` `(4)/(3) =(3xx10^(8))/(v_(2))` `:. v_(2)=(3xx3xx10^(8))/(4)` `=(9xx10^(8))/(4)` `=2.25xx10^(8)` m/s |
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| 7835. |
A householsd uses the following electric appliances. i. Refrigerator of rating 400 W each for ten hours each day. ii. Two electric fans of rating 80 W each for 12 hours each day. iii. Six electric tubes of rating 18 W each for 6 hours each day. Calculate the electric bill of the of houselod in a month if the cost per unit electric energy is Rs 3.00. |
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Answer» SOLUTION :Electrical energy consumed by Refrgerator in month (in KWH) `=(1xx400xx10xx30)/(1000)=120KWH` Electrical energy consumed by two electrical fans in a month (in KWH) `=(2xx80xx12xx30)/(1000)=57.6KWH` Electrical energy consumed by electric by electric tubes in a month (in KWH) `=(6xx18xx6xx30)/(1000)=(1944)/(100)=19.44KWH` Total electrical energy consumed by all the electrical appliances = 120 + 57.6 + 19.44 = 197.04 units COST of 1 unit = Rs 3 cost of 197.04 units `= 197.04xx3=Rs591.12 |
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| 7836. |
A concave mirror of focal length 20cm is placed 50cm from a wall. How far from the wall an object is placed to form its real image on the wall? |
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Answer» SOLUTION :V=-50cmF=-20cm From mirror FORMULA 1/u=1/f-1/v=-1/20+1/50=-3/100 U=-33.3cm THEREFORE the distance of the OBJECT from the wall x=50-u X=50-33.3=167.7cm |
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| 7837. |
Lets Think. If frog population declines all of a sudden : What will be the effect on paddy crop ? |
| Answer» Solution :CONSIDERING that FROGS feedon grasshoppers in a paddy FIELD, if the population of frogsdecreases suddenly, then the number of grasshoppers feeding on paddy crops will increase. Thus, the PRODUCTION of paddy crops will DECREASE. | |
| 7838. |
{:(1.,"Electric current",(a)"Volt"),(2.,"Potential difference",(b)"Ohm meter"),(3.,"Specific resistance",(c)"Watt"),(4.,"Electrical power",(d)"Joule"),(5.,"Electrical energy",(e)"Ampere"):} |
| Answer» Solution :1. (e )Ampere, 2. (a) Volt, 3. (b) OHM METER, 4. (C )Watt, 5. (d) Joule | |
| 7839. |
….. Are used to carry and place a satellite in a specific orbit? |
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| 7840. |
How will the magnetic field produced in a current-carrying circular coil change if we increase the (i) value of current, (ii) distance from the coil (it) number of turns of the coil ? |
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Answer» SOLUTION :(i) The magnetic field produced in a current-carrying circular coil increases on INCREASING the value of current. (ii) On increasing the distance from the coil, the magnetic field strength DECREASES. (ii) The value of magnetic field increases on increasing the NUMBER of TURNS of the circular coil. |
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| 7841. |
Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it? |
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Answer» Solution :According to Ohm.s LAW, I = `V/R` Here, as R = constant, `I prop V`. So, when the potential DIFFERENCE across the two ends of the electrical COMPONENT decreases to half of its FORMER value, the current through it will also decreases to half of its former value. |
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| 7842. |
A point source of light O of single colour is seen through a rectangular glass slab PQRS. The paths of two rays, in and outside the slab, are shown in figure. In the diagram, label the position I of the source O where it will appear when seen through the surface RS. (ii) Does the source O appear to be nearer or farther with respect to the surface PQ ? (iii) How does the shift depend on the thickness PS or QR of the slab? (iv) Justify your answer in (iii) with the help of an appropriate ray diagram. (v) For the same rectangular glass slab, which colour from the visible spectra (violet to red) will produce the maximum shift ? |
Answer» Solution :(i) In FIGURE, I is the position of source O when seen through the surface RS.  (ii) The source O appears to be at I, nearer with respect to the surface PQ when viewed through the surface RS. (iii) The shift OI decreases with the decrease in thickness PS or QR of the slab. (IV) The ray diagram is SHOWN in figure in which for the thickness PS, the image is at I, while for the thickness PS.( |
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| 7843. |
Which among the following is/are solid aerosol? (i) Dust (ii) Fog (iii) Aerosol spray (iv) Air |
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Answer» Solution :(i) Yeast - BUDDING (ii) SPIROGYRA - fragmentation (III) Amoeba - binary FISSION (iv) PLANARIA - regeneration |
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| 7844. |
A real image, equal in size to the object, is obtained when the object is placed at the centre of curvature in front of a |
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Answer» CONCAVE MIRROR |
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| 7845. |
In case of a real and inverted image, the magnification of a mirror is |
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Answer» POSITIVE |
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| 7846. |
(a) Distinguish between renewable and non - renewable sources of energy . (b) Choose the renewable of energy from the following list. Coal , biogas, Sun, natural gas |
Answer» SOLUTION :(a)  (B) SUN and BIOGAS. |
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| 7847. |
R=(rhol)/(A) What is rho ? |
| Answer» SOLUTION :`RHO` is a SPECIFIC RESISTANCE of a SUBSTANCE. | |
| 7848. |
What is refraction of light ?How is it related to refractive index ? |
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Answer» SOLUTION :1. Light changes its direction when going from one transparent medium to ANOTHER transparent medium. This is called as refraction of light. 2 The exten of change in the direction of the light ray is different for defferent media and it is related to therefractive index of the medium. |
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| 7849. |
TheVolumeoccupiedby 4.4 g ofCO_(2)at S.T.P |
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Answer» 22.4 litre |
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| 7850. |
The difference in the concentration of salts in water of two different seas is called |
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Answer» OCEAN current |
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