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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.
| 6301. |
A hemisphere is uniformly charged positively. The electric field at a point on a diameter away from the centre is directed. |
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Answer» PERPENDICULAR to the diameter |
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| 6302. |
Amount of light entering into the eye is controlled by ___________. |
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Answer» retina |
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| 6303. |
A person sitting in the compartment of a train moving with unifrom speed throws a ball in the upward direction . What path of the ball will appear to him ? What to a person standing outside ? |
| Answer» SOLUTION :(i) VERTICAL straight line MOTION (II) Parabolic path. | |
| 6304. |
Define Principal axis and pole. |
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Answer» SOLUTION :(i)n Principal axis : The LINE joining the centre of curvature and the optical centre. (II) Pole `(P_1 and P_2)` : The point at which the principal axis MEETS the SURFACE of the lens. |
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| 6305. |
The diagram alongside shows a pulley arrangement. (a) Name the pulleys A and B. (b) In the diagram, mark the direction of tension on each strand of string. (c) What is the purpose of the pulley B? (d) If the tension is T, deduce the relation between T and E (e) What is the velocity ratio of the arrangement ? (f) Assuming that the efficiency of the system is 100%, what is the mechanical advantage ? |
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Answer» (II) E=L/2 (e) 2, (F) 2. |
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| 6306. |
An electric heater of resistance 8 Omega draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater. |
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Answer» SOLUTION :The rate at which heat is developed in the electric heater will be given by the power of the heater. Now, Power, `P = I^(2) XX R` `P= (15)^(2) xx 8` `P= 225 xx 8` `P = 1800 W` or `1800 J//s` THUS, the rate at which heatis developed in the heater is 1800 joules per second. |
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| 6307. |
In aboveexperiment____ wouldbe useto finddirectionof magneticlinesof force. |
| Answer» Answer :D | |
| 6308. |
Define the term evolution. "Evolution cannot be equated with progress." Justify this statement. |
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Answer» Solution :The process by which we know how VARIOUS life forms have come into being from the PREVIOUSLY existing ones is known as evolution. Evolution cannot be equated with progress this is because (i) Evolution is caused due to variations in original form . (ii) This may lead to formation of new species but it does not mean that original type may not exist. (iii) It only LEADS to more complex body designs. (iv) The simplest life form i.e.bacteria exists till DAY and are found in all types of habitats from hot water springs to cold temperate regions etc. Bacteria are alsoone of the oldest life form known. So, we can SAFELY say that evolution cannot be equated with progress. |
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| 6309. |
Define evolution. How does it occur? Describe how fossils provide us evidences in support of evolution. |
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Answer» Solution :Evolution. Evolution is the sequence of gradual changes which take PLACE in the primitive organisms over millions of years in which new speices are produced. How it occurs? It is through the constant process of evolution taking place in the organisms since the origin of LIFE that such and enormous variety of plants and animals have come to exist on this earth at present. There is an inbuilt tendency to variation during reproduction due to errors in DNA copying and as a result of sexual reproduction. Relationship between fossils and evolution : Fossils are the remains of impressions of dead plants or animals which died millions of year ago. The study of fossils helps us to know about the evolution of species. Fossils tell us how new species are developed from the old. Fossils provide evidence of evolution by revealing characteristics of past organisms and the changes that have occured in these organisms to give rise to present organisms. Therefore, fossils have an importance in deciding EVOLUTIONARY relationship. For example, a fossil called Archaeopteryx has feathered wings like BIRDS but teeth and tail like reptiles HENCE suggesting that birds and reptiles had a common ancestor. |
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| 6310. |
If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are : |
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Answer» `[FVT^(-1)]` |
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| 6311. |
Which of the mirrors is converging mirror? |
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Answer» CONCAVE Mirror |
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| 6312. |
List any three qualities of an ideal source of energy. |
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Answer» Solution :An ideal source of ENERGY has following qualities : (i) PRODUCTION of large amount of heat/energy. (II) Easily accessible and easy to store WITHIN less space. (iii) Less or no production of toxic by PRODUCTS. |
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| 6313. |
If a piece of bread is kept in a container in moist place for 2-3 days, (1) What will you see? (2) Write scientific name and a character of the organism you may observe. |
| Answer» Solution :(1) If a PIECE of bread is KEPT in moist container we can SEE growth of fungus on it. (2) Fungi belonging to species Mucor is seen. It has filamentous body and SPORANGIA. Sporangia burst open to spread spores. It has saprophytic mode of NUTRITION as it devoid of chlorophyll. | |
| 6314. |
What is metastasis ? |
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Answer» Solution :(a) The CANCEROUS cells migrate to distant parts of the body and affect new tisses and this process is called Metastasis. (b) The superiority of the hybrid, obtained by cross breeding is called heterosis is hybrid VIGOUR. EFFECTS of hybrid vigour: (i) Increased production of milk by cattles. (ii) Increased production of egg by poultry. (iii) High quality of milk is produced. (iv) Increased growth rate in domesticated animals. |
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| 6315. |
Have you ever seen the persons inebriated with drugs or liquor loitering on dirty places ? Wheather such a pitiful condition of most intelligent human being is acceptable? |
| Answer» Solution :Addiction leads a person to hell. One can often see men under the influence of alcohol fallen on the streets, The durg addicts too are very unhygienic and dirty.They also have criminal tendencies.Alcohol and drug CAUSE loss of conscious thinking among the addicts They cannot think rationally and ligically.Their thought process is hampered and thus though he is an intelligent human being,his intellect is totally lost. Peoply like these are curse to the SOCIETY. Such PITIFUL condition of MAN is ABSOLUTELY improper. | |
| 6316. |
A proton beam is moving along the direction of a magnetic field. What force acts on the proton beam ? |
| Answer» SOLUTION :Zero, because `theta = 0` and hence, F = BIL sin `theta = 0 `. | |
| 6317. |
Explain with suitable examples importance of anatomical evidences in evolution. |
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Answer» Solution :(1) There are similarities in the structure and anotomy of different animal group. E.g. human hand, forelimb of BULL, patagium of bat and flipper of whale are all similar in their internal anothomy. There is SIMILARITY in the bones and joints of all these specimens. (2) External morphology does not show any similarity. Use of each of the ORGAN is also different in different animals. Structurally, they may not be related. (3) However, the similarities in the anatomy is an EVIDENCE that they may have a common ancestor. (4) In this way, the anatomical evidence throws light on the process of EVOLUTION. |
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| 6318. |
_________depends on the nature , density and size of the fissile material. |
| Answer» SOLUTION :CRITICAL MASS | |
| 6319. |
Let [in_0] denote the permittivity of vaccum. If M = mass, L = length, T = time and A = electric current, then : |
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Answer» `[in_0]= M^(-1) L^(-3) T^2 A` |
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| 6320. |
When two bodies have the same temperature, they are said to be in___________. |
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Answer» THERMO static |
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| 6321. |
The value of 'g' __________ at all pointson the surface of Earth . |
| Answer» SOLUTION :not same | |
| 6322. |
Draw a graph of temperature versus time. |
Answer» Solution : The GRAPH of temperature VERSUS time is SHOWN below. 
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| 6323. |
Overloading |
| Answer» SOLUTION :The OVERHEATING of electrical wiring in any circuit due to flow of large current through it is CALLED OVERLOADING of electric circuit | |
| 6324. |
" We know that sound is a form of energy. So, the large amount of energy peoduced due the sound pollution in cosmopolitan cities can be used to our day to day needs of energy. It also helps us to protect biodiversity in urban areas". Do you agree with this statement ? Explain. |
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Answer» Solution :1) Sound is a form of mechanical energy. 2) So, the mechanical energy can be converted into electical energy. 3) Experiments are going on this concept. 4) If this is successful, we have the following BENEFITS. a) Sound pollution can be controlled. b) Conventional methods of PRODUCING electrical energy from coal or water will cause in loss of BIODIVERSITY. This can be avoided. C) Natural resources LIKE water can be protected. d)Increasing needs of energy can be overcome by this method. |
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| 6325. |
In question 93, if Suresh were standing unsym-metrically between parallel cliffs, the distance between two cliffs is |
| Answer» Answer :A | |
| 6326. |
none of these |
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Answer» 8J Total resistance in seires = 2 R Total resistnace in paralel `=(R xx R)/(R+R) = R/2` `THEREFORE` Heat produced per second `(= (V ^(2))/(R ))` at onstant VOLTAGE will be four TIMES in parallel than in series. |
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| 6327. |
What is the role of fuse used in series with any electrical appliance ? Why should a fuse witha defined rating not be replaced by one with a large rating? |
| Answer» Solution :A fuseis a current-conducting wire made of puretin or of an alloy of copper and tin, has low RESISTANCE, and a low meltingpoint. A fuse is rated for EITHER 5 A or 15 A . When a currentmore than the rated value flows through it, the fuse wire melts and breaksthe circuit. Thus, it protects the appliances [with which it is connected in series] from getting damaged. If a fuse is REPLACED by one with larger RATINGS, the fuse does not burn off and the appliancesmay GET damaged. | |
| 6328. |
A wire with a green insulation is usually the live wire of an electric supply . |
| Answer» Solution :False. REASON : Live wire has RED INSULATION cover, whereas earth wire has GREEN insulation colour in the domestic circuits. | |
| 6329. |
Diagram shows lengthwise 2 sections of a current carrying solenoid. X indicates current entering into the page, andindicates current emerging out of the page. Decide which end of the solenoid A or B, will behave as north pole. Give reason for your answer. Also draw field lines inside the solenoid. |
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Answer» SOLUTION :A = south pole, B = north pole. When north pole of a BAR magnet is brought near to end connected to negative terminal of BATTERY then solenoid repels bar magnet. It means the end of solenoid which is connected to negative terminal of the battery BEHAVES as north pole. For figure - Refer to Q. 2. |
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| 6330. |
Human male reproductive system. |
Answer» SOLUTION : 
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| 6331. |
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will same current be induced in the coil B? Give reason. |
| Answer» Solution :Two circular coil, A and B are placed close to each other when the current in coil A is changed, the magenetic field ASSOCIATED with it ALSO changes. As a result the magentic field around coil B also changes. This change in MAGNETIC field lines around coil B induces an ELECTRIC current in it. This is called electromagnetic induction. | |
| 6332. |
Observe the diagram given and answer the question asked. c. What changes are seen compare to normal eye of image formation? |
| Answer» SOLUTION :The IMAGE of the NEARBY objects are formed on retina. When in HYPERMETROPIA, images are formed behind the retina. | |
| 6333. |
Two bodies one light and one heavy have same kinetic energy . Whichwill have moremomentum and why ? |
| Answer» SOLUTION :HEAVIER BODY. | |
| 6334. |
Out of animals of prey and predators, which have their eyes : (i) at the front of their head ? (ii) on the opposite sides of their head ? |
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Answer» |
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| 6335. |
Conventional and Non-conventioanl Sources of energy. |
Answer» SOLUTION :
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| 6336. |
Calculate the total energy of free-fall at different heights. |
Answer» Solution :An object of mass 20 KG is dropped from a height of 4 m. COMPUTE the potential and kinetic energy in each case and write the values in the table . (TAKE g = 10 `ms^(-2)`) 
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| 6337. |
Describe an activity to explain how a moving magnet can be used to generate electric current in a coil. |
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Answer» SOLUTION :Take a coil AB of insulated copper wire having anumber of turns. Connect the ends of coil to a sensitive galvanometer . Now take a BAR magnet NS and rapidly bring the magnet towards the end B of coil as shown in Fig. 13.24. The galvanometer gives momentary deflection in one direction. Now take the magnet away from the coil, the galvanometer again gives momentary deflection but in the OPPOSITE direction. It clearly shows that motion of magnet induces, a current in the coil. Again keep the magnet fixed and gently move the coil AB either towards the magnet or away from the magnet. We get deflection in galvanometer even now. Thus, an induced current is produced in a coil whenever there is relative motion between the coil and the magnet. This PHENOMENON is known as the electromagnetic induction. 
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| 6338. |
Let the speed of the planet at the perihelion P in figure be v_(P) and the Sun planet distance SP be r_(P). Relater r_(P), v_(P) to the corresponding quantities at the aphelion (r_(A),v_(A)). Will the planet take equal times to transverse BAC and CPB? |
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Answer» Solution :The magnitude of angular momentum at P is `L_(p)=m_(p)r_(p)v_(p)` Similarly magnitude of angular momentum at A is `L_(A)= m_(A)r_(A)v_(A)` From conservation of angular momentum `m_(p)r_(p)v_(p)= m_(A)r_(A)v_(A)` `(v_p)/(v_A)= (r_A)/(r_p)` `r_(A) gt r_(p) :. v_(p) gt v_(A)` area bound by SB and SC `(SBAC gt SBPC)` By 2nd law equal areas are SWEPT in equal INTERVALS of time. Time taken to TRANSVERSE `BAC gt ` time taken to transverse CPB. |
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| 6339. |
Let's Think. Which electricity generation process is eco-friendly and which not ? |
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Answer» SOLUTION :i.Electricity generation processes USING fossil fuels such as coal, natural gas and nuclear fuels like URANIUM and plutonium are not eco-friendly. ii. Electricity generation from green ENERGY sources like water reservoirs, wind. Sunlight, bio-fuels etc, are eco-friendly. |
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| 6340. |
What is meant by sustainable management ''? Why is reuse considered better than recycling ? |
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Answer» Solution :A type of MANAGEMENT which encourages utilisation of resources that meet CURRENT basic human NEEDS while PRESERVING the resources for the needs of future GENERATIONS is called sustainable management. Reuse is betteras it does not consume energy. |
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| 6341. |
Find the minimum resistance that can be made using five resistors, each of 5 Omega . |
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Answer» Solution :By connecting resistors in parallel, RESISTANCE `1 OMEGA` is OBTAINED `R_(eq)= (R)/(N)= (5OMEGA)/(5) = 1 Omega` |
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| 6342. |
Distinguish between Human male and Human female reproduction system: |
Answer» SOLUTION :
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| 6343. |
Assertion : Blue colour of sky appears due to scattering of blue colour. Reason : Blue colour has shortest wavelength in visible sky. |
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Answer» Both assertion and REASON are true and reason is CORRECT explanation of assertion. |
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| 6345. |
Equation for superficial expansion is ___________. |
| Answer» SOLUTION :`(DELTAA)/(A_(0)) = alpha_(A)DELTAT` | |
| 6347. |
What is an ideal gas ? Explain its main characteristics. |
| Answer» SOLUTION :GAS in which INTERMOLECULAR FORCES are ABSENT | |
| 6348. |
A household uses the following electrical appliances: i] Refrigerator of rating 400 W for 10 h each day. ii] Two electric fans of rating 80 W each for 6 h daily. iii] Six tube lights of 18 W each for 6 h daily. Calculate the energy consumed per day by each of these appliances in kWh. |
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Answer» Solution :i] Energy consumed per DAY by refrigerator = `0.4kWxx10h` `because` power of refrigerator = `400W=400/1000kW=0.4kW` = 4kWh ii] Energy consumed per day by fan = `2xx0.08kWxx6h` `because` power of each fan = `80W=80/1000kW=0.08kW` = 0.96kWh iii] Energy consumed per day by 6 tuve lights = `6xx0.018kWhxx6h` `because` power of each electric TUBE `=18W=18/1000kW=0.018kW` = 0.648 KWH |
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| 6349. |
Which of the following are water intensive crops ? |
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Answer» WHEAT and RICE |
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| 6350. |
Explain the construction and working of a 'Compound Microscope'. |
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Answer» Solution :(i) Rayleigh.s scattering law staes that "The amount of scattering of light is inversely proportional to the fourth power of its wavelength" Amount of scattering, `Sprop(1)/(lamda^(4))` (II) A compound microscope consists of two convex lenses. the LENS with the shorter focal length is placed near the object, and is called as .objective lens. or .objective piece.. the lens with larger focal length and larger aperture placed near the observer.s eye is called as .eye lens. or .eye piece.. Both the lenses are fixed in a narrow tube with adjustable provision.  WORKING (i) The object (AB) is plaed at a distance slightly greater than the focal length of objective lens `(u gt f_(o))` (ii) A real, inverted and magnified image (A.B.) is FORMED at the other side of the objective lens. (iii) This image behaves as the object for the eye lens. the position of the eye lens is adjusted in such a way, that the image (A.B.) falls within the principal focus of the eye piece. (iv) This eye piece forms a virtual, enlarged and erect image (A"B") on the same side of the object. (v) Compound microscope has 50 to 200 times more magnification power than simple microscope. |
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