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.
| 7701. |
What are natural resources ? |
| Answer» SOLUTION :Natural resources are NATURALLY occuring SUBSTANCE useful to man in their unmodified (natural) forms . | |
| 7702. |
Impression of an image lasts on the retina for1/10 the of a second. |
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Answer» DISPERSION |
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| 7703. |
To increase the magnification of the telescope _________ |
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Answer» Increase the focal length of the objective |
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| 7704. |
What is coliform bacteria? What does its presence in water indicate? |
| Answer» Solution :Coliform is a group of bacteria which is found in human intestines. Its presence in WATER indicates contamination by DISEASE CAUSING microbes. Its high presence in river and pondselevates the risks of water borne DISEASES like gastroentrites. | |
| 7705. |
Namethe device used to preventdamage to the electrical applianceand domesticcircuit due to overloadingor short -circuiting . |
| Answer» SOLUTION :ELECTRIC FUSE | |
| 7706. |
The normalpHofhumanbloodis ____________ |
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Answer» 7.4 |
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| 7707. |
Derive an expression for the heat produced by electric current and state Joule's Law. |
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Answer» Solution :`P= Vxx(Q)/(T)` P =VI `H=Pxxt` `= Vixxt = VIT` H= IRIt [ V = IR , Ohm.s law ] `=I^(2) Rt.` Joule.s Law : When current of l ampere flows in a wire of RESISTANCE R `Omega` for t SECONDS, the heat energy disspated by it is given by `H= I^(2) Rt` |
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| 7708. |
Which of the following statements is/are correct ? (i)alpha particles are photons (ii) Penetrating power of gamma radiation is very low (iii) ionization poweris maximum for alpha rays (iv) Penetrating power of gamma radiation is very high |
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Answer» (i) & (ii) are correct |
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| 7709. |
How does the short circuit form ? What is its effect? |
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Answer» Solution :1. The home electrical connection consists of live, neutral and earth wires. 2.The earth wire is connected to the ground 3. Due to any fault in the equipment or if the plastic coating on the live and the neutral wire MELTS , then , both the wires will come in contact with each other . 4.This may result in EXCESSIVE current flow in the power by breaking the circuit and leads to short circuit. 5. If any inflammable MATERIAL, such as wood, cloth, plastic, etc. exits aroundcatch fire. 6. The DAMAGE due to short circuit can be PREVENTED by by using good quality of Fuse or MCB |
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| 7710. |
Which typeof currentis obtainedfroma battery ? |
| Answer» Answer :A | |
| 7711. |
A perfect carnot engine utilizes an ideal gas the source temperature is 500 K and sink temperature is 375 K. If the engine takes 600 k cal per cycle from the source, calculate Heat rejected to sink per cycle |
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Answer» SOLUTION :`w=Q_1-Q_2Q_2=Q_1-W=600-150` = 450 K CAL |
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| 7712. |
A perfect carnot engine utilizes an ideal gas the source temperature is 500 K and sink temperature is 375 K. If the engine takes 600 k cal per cycle from the source, calculate The efficiency of engine |
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Answer» Solution :`T_1=500K,T_2=375K` `Q_1` = HEAT ABSORBED = 600 k CAL `eta=1-T_2//T_1=125/500=0.25` `=25%` |
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| 7713. |
A perfect carnot engine utilizes an ideal gas the source temperature is 500 K and sink temperature is 375 K. If the engine takes 600 k cal per cycle from the source, calculate Work done per cycle |
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Answer» SOLUTION :`eta=W/Q_1` `W=etaQ_1=0.25xx600 ` K CAL `=150` k cal |
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| 7714. |
What is radial Symmetry ? |
| Answer» Solution :If any imaginary plane PASSING through central axis but any plane of the body FORMS two equal halves ,then it is CALLED radial SYMMETRY . | |
| 7715. |
Mention the function of eye lens. |
| Answer» SOLUTION :It finely adjusts its focal length so that OBJECTS at different distances are FOCUSED CLEARLY on the RETINA. | |
| 7716. |
If an electric heater consumes electricity at the rate of 500 W and the potential difference between the two terminals of electric circuit is 250 V, calculate the electric current and resistance through the circuit |
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Answer» Solution :Given : Power (P) = 500 W, Potential difference (V) = 250 V To find:CURRENT (I) and Resistance (R) Formula : P = VI and V = IR Solution : We KNOW that power (P) = VI `therefore ` 500 = 250 x I I =2A We know, resistance R = V/ I `R="250V"/"2A"=125Omega` The electric current and resistance are 2A and 125 `Omega` respectively. |
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| 7717. |
A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure : |
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Answer» A |
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| 7718. |
Wher do the elctrons get energy for their motion from ? |
| Answer» SOLUTION :From an electric field SET up throughout the CONDUCTOR. | |
| 7719. |
(i) Calculate the mass of 2.5 mole of oxygen atom. (ii) Calculate the number of molecules in 11g of CO_2. |
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Answer» SOLUTION :(i) Number of MOLES `=("Mass")/("Atomic mass")` `:. ` Mass = Number of moles `xx` Atomic mass `=0.5xx16=8g` (ii) GRAM Molecular of `CO_2=44g` Number of MOLECULES present in 44 g of `CO_2=6.023xx10^(23)` `:.` Number of molecules present in 11G of `CO_2=(6.023xx10^(23))/44xx11` `=1.53xx10^(23)` molecules (iii) Number of moles = `("Mass")/("Atomic mass")` `81/27=3` moles |
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| 7720. |
A radioactive elements is converted into fissionable material are called fissile material. |
| Answer» SOLUTION :A RADIOACTIVE elements is converted into FISSIONABLE material are called fertile material. | |
| 7721. |
What are two essential features of Carnot’s ideal heat engine ? |
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Answer» Solution :(i) Source and sink have INFINITE heat capacities. (II) Each PROCESS of the ENGINE’s cycle is FULLY reversible. |
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| 7722. |
What are the disadvantages of fossil fuels ? |
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Answer» Solution :(i) BURNING of fossil fuels CAUSES air pollution and also leads to global warming by causing green house EFFECT. (ii) Fossil fuels are non-renewable, hence, can exhaust one day if not WISELY USED. |
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| 7723. |
ls there any relationship of latent heat with the regelation? |
| Answer» Solution :Yes, there is a relationship between the LATENT heat and regelation. The phenomenon in which the ice CONVERTS to liquid due to applied PRESSURE and then reconverts to ice once the pressure is removed ts called regelation. The heat absorbed or GIVEN out during this TRANSFORMATION of ice into water and heater into ice is the latent heat. | |
| 7724. |
A person can see nearby objects clearly but distant objects appear blurry. Which vision defect is he suffering from ? |
| Answer» SOLUTION :MYOPIA or short-sightedness. | |
| 7725. |
Biotechnology is not only beneficial but it has some harmful effects too. Express your opinion about this statement. |
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Answer» Solution :(1) Biotechnology has proved to be useful in the field of agriculture, medicine, clean technology and industrial products. (2) Due to various biotechnological experiments, the food production is increased substantially. The milk and milk products are now freely available. People no longer die of hunger due to abundant food supply. (3) The sophisticated vaccines have stopped the spread of epidemics. (4) The diseases like diabetes can be controlled due to human insulin injections that can be manufactured by biotechnology. (5) The problems of pollution CONTROL, solid waste management and fuels are partially tackled by biotechnological ALTERNATIVES. (6) Though all such positive aspects are there, the biotechnology also poses some problems. The genetic changes are breaking the principles of nature. By inserting human genes in bacteria or virus, the products that are NEEDED only for humans are produced. (7) Human cloning is also a debatable issue. It will cause social and ethical problems. The NEW generations formed by cloning will have mothers but no fathers. If man tries to manipulate the genomes of other living organisms, it will cause disturbances in the natural balance. The long term effects of all such genetic manipulations can be disastrous. Thus, according to some VIEWS, biotechnology can be dangerous too. |
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| 7726. |
Draw a ray diagram showing refraction of a light ray from a refracting glass slab. |
Answer» Solution :REFRACTING of a LIGHT RAY through a glass slab is SHOWN in Figure. 
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| 7727. |
At sunrise and sunset , the light rays from the sun have to travel a _________ in the atmosphere is known as ________ scattering. |
| Answer» SOLUTION :LARGE DISTANCE | |
| 7728. |
Given : force = (alpha)/("density" + beta^3). What are the dimensions of alpha, beta ? |
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Answer» `ML^(–2) T^(–2) ,ML^(–1//3)` Solve, `beta=[M^(1//3)L^(-1)]` Force = `(alpha)/("density")` `alpha` = Force `xx` density `=[MLT^(-2)ML^(-3)]` `=[M^(2)L^(-2)T^(-2)]` |
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| 7729. |
What connection is used in domestic appliances and why ? |
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Answer» Solution :(i) In domestic appliance it is USED parallel connection to avoid short circuit and breakage. (ii) It has alternative current (AC). Not DC current as it is FORM cables, so high potential is flow through this. (iii) One more ADVANTAGE of the parallel connection of circuits is that each electric appliance gets an equal voltage. |
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| 7730. |
What is the minimum distance needed for an echo? |
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Answer» SOLUTION :(i) heminimum DISTANCE required to hear an ECHO is `1//20^(th)` part of the magnitude of the velocity of SOUND in air. (ii) If you consider the velocity of sound as `344ms^(-1)`, the minimum distance required to hear an echo is |
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| 7731. |
…………. ,is second largest phylum in animal kingdom. |
| Answer» Solution :MOLLUSCA is second LARGEST phylum in ANIMAL kingdom. | |
| 7732. |
In rabbit,.....................type of teeth is absent. |
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Answer» incisors |
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| 7733. |
A light ray travelling from medium 1 to medium 2, does not suffer refraction. List down all the conditions which support this occurrence. |
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Answer» Solution :(i) The refractive index of medium 1 and medium 2 are the same. (II) The INCIDENT ray is ALONG the NORMAL. In such a case, there is no angle of refraction. |
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| 7734. |
At a given distance from the center of electric dipole, field intensity on axial line is k times the field intensity on equatorial line, where k = |
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Answer» 2 |
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| 7735. |
Switching off unnecessary lights and fans and repairing leaking taps correctly defines which term of 5R's ? |
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Answer» Recycle |
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| 7736. |
State at least three points of differencebetween the followingterms/ quantities : Direct Current (DC) and Alternating Current (AC). |
Answer» SOLUTION :
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| 7738. |
Show how you would connect three resistors, each of resistance 6 Omega, so thatthe combination has a resistance of (i) 9 Omega, (ii) 4Omega. |
Answer» Solution :(i) In ORDER to get a resistance of 9 n fromthree RESISTORS, each of resistance 6 `Omega`, we connect two `6 Omega` resistors in parallel and this parallel combination is connected in series with the third `6 Omega` resistor as shown in the following figure: This is because `1/R_P = 1/6 + 1/6 + 1/6 =(1 +1)/6 =2/6 = 1/3` `:. R_p = 3Omega and R_p + 6 Omega = 3Omega + 6Omega = 9 Omega` (ii)In order to get a resistance of `4 Omega` from three resistors, each of resistance `6 Omega`, we connect two `6 Omega` resistors in series and this series combination is connected in parallel to the third `6Omega` RESTSTOR as shown in the following figure :  This is because `R_s = 6 + 6 = 12 Omega` Now, `1/R_P = 1/R_s+ 1/6` `:. R_P = (6xxR_s)/(6 + R_s) =(6 xx 12)/(6 + 12) = 72/18 = 4 Omega` |
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| 7739. |
Which of the following is ultimately not derived from the sun's energy (or solar energy) |
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Answer» WIND energy |
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| 7740. |
A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens ? Draw the ray diagram. |
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Answer» SOLUTION :Focal lengths of concave lens (oF1) `f=-15 cm` Image distance, `V=-10 cm` According to the lens formula, `(1)/(v)-(1)/(u)=(1)/(f)` `(1)/(u)=(1)/(v)-(1)/(f)` `=(-1)/(10)-(1)/(-15)=(-1)/(10)+(1)/(15)=(-5)/(150)` `u=-30 cm`. The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the FOLLOWING ray diagram. 
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| 7741. |
Openinga pen cap : __________ :: Opening the door : moment of force |
| Answer» SOLUTION :MOMENT of COUPLE | |
| 7742. |
Why do we use convex surface for side view mirror? |
| Answer» Solution :Convex mirror always from virtual, SMALLER and UPRIGHT image of OBJECT for wide RANGE. | |
| 7744. |
Which instrument is used to measure potential difference or emf ? |
| Answer» Solution :A VOLT meter is used to measure potential difference or emf ACROSS an electric device LIKE battery. It MUST be connected PARALLEL to the electric device. | |
| 7745. |
How can you find the age of fossiles ? |
| Answer» Solution :The age of fossils is determined by radioactive elements present in it. They may be carbon, URANIUM, LEAD or potassium. By radio active carbon `(C^(14))` dating method, carbon consumption of animals and plants stops after death and SINCE then , only the decaying process of `C^(14)` occurs continuously. The time PASSED since death of a plant or animal can be calculated by measuing the amount of `C^(14)` present in their body. | |
| 7746. |
Which factors affects the social health? |
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Answer» Solution :In ORDER to maintain the social health of any community there should by good emenities for the people E.g. food water,shelter, clothing mediciness and medical help, equal opportunities for education,cleanliness of the surrondings,transport facilities etc should be properly provided (2)The social and political conditions of the surrounding should be such that there should not be any connections with world of criminals.The presence of such criminal ties can affects the social health to a great EXTANT (3) The GARDENS,playgrounds,the empty plots for outdoors games,sports clubs etc,are important criteria for ovarall development of the society,This result into personality development and make people HAPPY and strong (4) Addictions,criminal tendencies pervert behaviour and perverse thinkings affects other people in the society and his reflects negatively on the social health (5) having large number of friends and relatives propers use of time when alone and when along the peer group. trust in OTHERS, respects and acceptance for others build stronger social health, |
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| 7747. |
How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the straight conductor ? Give reason to justify your answer. |
| Answer» Solution :The strength of magnetic FIELD due to a current-carrying straight conductor is inversely proportional to the normal DISTANCE between the conductor and the point where magnetic field is to be determined. So as the point as moved AWAY the strength of the magnatic field goeson decreasing. | |
| 7748. |
What is a solenoid ? Draw the magnetic field pattern through and around a current carrying solenoid. |
| Answer» SOLUTION :SEE Short ANSWER QUESTION Number 12. | |
| 7749. |
List the new Cartesian sign convention for reflection of light by spherical mirrors. Draw a diagram and apply these conventions for calculating the focal length and nature of a spherical mirror which forms a (1)/(3) times magnified virtual image of an object placed 18 cm in front of it. |
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Answer» Solution :For new CARTESIAN sign convention for reflection of LIGHT by SPHERICAL mirror, see Point NUMBER 15 under the heading "Chapter At A Glance". As per question and using the sign convention followed u = - 18 cm and magnification `m = + (1)/(3)` `therefore""m = - (v)/(u) = + (1)/(3)` `rArr""v = - (u)/(3) = - ((-18))/(3) = + 6` cm `therefore""(1)/(f) = (1)/(v) + (1)/(u) = (1)/((+6)) + (1)/((-18)) = (3-1)/(18) = (2)/(18) = (1)/(9)` `rArr""f = + 9` cm The +ve sign of .f. signifies that the mirror is a convex mirror. The ray diagram is shown in Figure. 
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| 7750. |
Star fish , Sea urchin, Nereis , Sea - cucumber |
| Answer» SOLUTION :Neries . (Neries BELONGS to Annelidaall the REMAINING are Echinodern ANIMALS . ) | |