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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.
| 8701. |
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time [if they are all connected in parallel]? |
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Answer» 93 |
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| 8702. |
Air temperature in the Rajasthan deserrt can reach 46^(@)C. What is the velocity of sound in air at that temperature ? (V_(0)=331ms^(-1)). |
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Answer» Solution :VELOCITY of sound `v_(0)=331ms^(-1)` AIR TEMPERATURE , `T=46^(@)C` Velocity of sound in air temperature `v_(T)=(v_(0)+0.61T)ms^(-1)` `=331+(0.61xx46)` `=331+28.06` `v_(T)=359.06ms^(-1)` |
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| 8703. |
While deciding the unit for heat, which temperatures interval is chosen? Why? |
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Answer» Solution :1.While deciding the unit for heat, the temperature INTERVAL from `14.5^@C` to `15.5^@C` is chosen. 2. If we heat 1 KG of WATER by `1^@C` in DIFFERENT temperature range other than `14.5^@C` to `15.5^@C`, then the amount of heat required will be SLIGHTLY different. 3. Therefore, it is essential to define a specific temperature range from `14.5^@C` to `15.5^@C` while deciding the unit for heat. |
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| 8704. |
Define principal axis of a spherical mirror. |
| Answer» Solution :A straight line passing through the pole and the CENTRE of CURVATURE of a SPHERICAL mirror is called its principal AXIS. | |
| 8705. |
Write the uses of simple microsocpe . |
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Answer» Solution :Simple microscopes are USED (i) By WATCH repairers and jewellers. (III) To OBSERVE parts of flower , insects etc . (iv) To observe finger PRINTS in the field of forensic science. |
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| 8706. |
Which of the following pairs have same dimensions ? |
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Answer» TORQUE and Work |
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| 8707. |
What is dew point temperature ? OR Define dew point temperature ? |
| Answer» Solution :If the TEMPERATURE of unsaturated air is decreased, a temperature is reached at which the air becomes SATURATED with water vapour. This temperature is CALLED the DEW POINT temperature. | |
| 8708. |
Name the phenomena due to which we get 1ight from the Sun before actual sun rise. |
| Answer» SOLUTION :ATMOSPHERIC REFRACTION. | |
| 8709. |
Mention two different ways of harnessing energy from ocean. |
| Answer» Solution :Tidal WAVE, OTEC (OCEAN THERMAL Energy CONVERSION) | |
| 8710. |
A concave lens of focal length 15 cm forms an image 10 cm forms the lens. How far is the object placed from the lens? Draw the ray diagram. |
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Answer» Solution :f=-15cm,v=-10cm,u=? `1/f=1/v-1/u` `1/u=1/v-1/f=(f-v)/(fv)` `u=(fv)/(f-v)=((-15)xx(-10))/(-15-(-10))=150/(-5)=-30CM` `u=-30cm` 
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| 8711. |
The resistance per metre length of a wire is 10 Omega. If the resistivity of the material of the wire is 50 xx 10^(-8) ohm metre, find the area of cross- section of the wire. |
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Answer» SOLUTION :`R = (rhol)/(A)` `10= (50xx10^(-8)xx1)/(A)` `A= (50xx10^(-8)xx1)/(10)= 5xx10^(8) m^(2)` |
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| 8712. |
The main constituent of biogas is |
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Answer» methane |
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| 8714. |
Explain the term the earth's gravitational force. What is the value of g? |
| Answer» Solution :The earth ATTRACTS every object TOWARDS it because of the gravitational force. As the earth's centre of mass is at its centre, the gravitational force exerted by the earth on an object is directed towards the earth's centre. Hence, an object released from a point above the earth's surface falls vertically downward towards the earth. If an object is THROWN vertically upward, its velocity goes on decreasing DUE to the earth's gravitational force on the object. At one stage, the velocity of the body becomes zero and later the body falls back to the earth. | |
| 8715. |
Define power of accommodation. |
| Answer» Solution :The ability of the eye to FOCUS the distant OBJECTS as well as the nearby objects on the retina by changing the FOCAL length of the eye lens is called POWER of accommodation. | |
| 8716. |
Name the colour of white light which is deviated (i) the most, and (ii) the least, on passing through a prism. |
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Answer» |
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| 8717. |
Why did Mendel carry out an experiment to study inheritance of two traits in garden-pea ?(b) What were his findings with respect to inheritance of traits in F1 and F2 generation ?(c) State the ratio obtained in the F2 generation in the above mentioned experiment. |
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Answer» Solution : When two pairs of contrasting characters were studied simultaneously, it was FOUND that two TRAITS are inherited independent of each other. (b) SINCE in F1, all are heterozygous for both traits, so yellow and round are dominant traits. These traits are not inherited together and hence there are two new recombinants. Thus, they are inherited independently. (C) In F2 the PARENTAL and recombinants ratios are : 
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| 8718. |
How does atmospheric refraction affect the duration of the day on the earth? |
| Answer» Solution :It advances sunrise by 2 minutes and DELAYS the SUNSET by 2 minutes. HENCE, it increases the LENGTH of the day by 4 minutes. | |
| 8719. |
(i) Which hormone requires iodine for its formation ? What will happen if intake of iodine in our diet is low ? (ii) What is the importance of raivater harvesting ? (iii) What is colosturm ? How is milk production hormonally regulated ? |
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Answer» Solution :Thyroxine hormone requires iodine for its FORMATION. Goitre will occur due to theinadequate SUPPLY of iodine in our DIET. Goitre is the enlargement of the THYROID GLAND. |
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| 8720. |
Draw a well labelled diagram of a solar cooker. Identify two components in its structure that helps in maximizing heat absorption in it. |
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Answer» Solution :PLANE mirror, glass sheet, PAINTED BLACK inside the cooker. A SOLAR Cooker : (i) Its black surface absorbs more heat (ii) Focused mirror. 
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| 8721. |
Which of the following can make a parallel beam of light when light from a point source is incident on it |
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Answer» Concave mirror as well as convex LENS |
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| 8722. |
Draw neat and labelled diagrams. Wind turbine (wind mill) |
Answer» SOLUTION :
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| 8723. |
Why do two magnetic field lines of force never intersect each other? |
| Answer» SOLUTION :TWO magnetic field lines of force never intersect each other. If the lines intersect, then at the point of intersection there would be two DIRECTIONS 9the NEEDLE would point towards two directions) for the same magnetic field, which is not possible. | |
| 8725. |
Assertion : Sound wave cannot propagate through vacuum but light can. Reason : Sound wave cannot be polarised but light can. |
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Answer» Both ASSERTION and REASON are true and the reason is the correct EXPLANATION of the assertion. |
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| 8726. |
Three resistors of 1Omega each are connected to form a triangle. The resistance between any two terminals is : |
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Answer» 3Ω |
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| 8727. |
As K.E. of the gas increases then the ..................... increases. |
| Answer» SOLUTION :TEMPERATURE | |
| 8728. |
What is meant by binary solution? give example. |
| Answer» SOLUTION :A solution should at least be CONSISTING of two components. Such solution, which are made of one solute and one SOLVENT are called binary solution. EG. on ADDING `CuSO_4` crystals to water. | |
| 8729. |
State a conclusion that can be drawn on the basis of this observation |
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Answer» Solution :DNA that contains all the information is the main factor RESPONSIBLE for inherited traits. Outcomes of Mendel.s experiments. (i) Both parents contribute equally towards the progeny. (ii) Traits may be EITHER DOMINANT or recessive. (iii) A dominant trait will be expressed in both heterozygous as WELL as homozygous condition while recessive trait will be expressed only in homozygous condition. (iv)) The traits are inherited INDEPENDENT of each other. |
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| 8730. |
A student using the same two resistors, ammeter, voltmeter and battery, sets up two circuits A and B connecting the two resistors first in series and then in parallel. If the ammeter and voltmeter readings in the two cases be I_(1), I_(2) and V_(1), V_(2) respectively, he is likely to observe that : |
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Answer» `I_(1) = I_(2)` but `V_(1) ne V_(2)` |
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| 8731. |
What is a good source of energy? |
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Answer» Solution :(i) A good energy SOURCE does a LARGE amount of work per unit volume or mass. (ii) It is EASILY accessible. (iii) It is easy to store and transport. (iv) It is economical. (v) It PRODUCES less amount of SMOKE. |
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| 8732. |
In the experiment on finding the equivalent resistance of two resistors connected in series, three students connected the ammeter in their circuits in the three ways X, Y and Z shown here. Assuming their ammeters to be ideal, the ammeters have been correctly connected in |
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Answer» CASES X and Y only |
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| 8733. |
What are the causes of 'Myopia' ? |
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Answer» Solution :Myopia, also known as short SIGHTEDNESS, OCCURS due to the lengthening of eye ball (b) Nearby objects can be seen clearly but DISTANT objects cannot be seen clearly (c) The focal length of the EYELENS is reduced or the distance between eye lens and retina increases.the retina (d) Due to this, the IMAGE of distant objects are formed before the retina. (ii) Draw a ray diagram, a ray is passing parallel to the optic axis of convex lens 
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| 8734. |
Biomass is the material contained in the bodies of plants and animals. It includes the waste from trees and grass, crops, forestry, agricultural and urban wastes. The excreta of living organisms and their bodies after death also contributes biomass. (i) Comment on the statement "Biomass is a fuel". Justify the statement by giving two reasons. (ii) What is Bagasse ? |
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Answer» Solution :(i) REASONS : (a) It is a TRADITIONAL source of energy which is USED in domestic as well as industrial area. (b) Usually firewood is burnt in traditional CHULHAS. (ii) Bagasse is a residue of sugarcane after EXTRACTING juice from them. |
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| 8735. |
The mechanical equivalent of heat |
| Answer» Solution :`[J]=[("Work")/("HEAT")]=(M^(1)L^(2)T^(-2))/(M^(1)L^(2)T^(-2))=[M^(0)L^(0)T^(0)]` | |
| 8736. |
A photocell converts light energy into |
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Answer» CHEMICAL energy |
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| 8737. |
The dimensional formula for Boltzmann's constant is |
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Answer» Solution :Boltzmann Constant : `K=("Heat")/("Temperature")IMPLIES[k]=(ML^(2)T^(-2))/(K)=[M^(1)L^(2)T^(-2)K^(-1)]` |
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| 8738. |
The speed of a wave in medium is 760 ms^(-1). If 3600 waves cross a point in the medium in 2 minutes, then the wavelength of the wave is : |
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Answer» 13.8m `n=(3600)/(2xx60)=30` `lamda=(v)/(n)=(760)/(30)=25.3m` |
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| 8739. |
Energy transformation Energy transformation in thermal power plant in nuclear power plant |
Answer» Solution :The MINIMUM number of STEPS of energy conversion are INVOLVED in solar PHOTOVOLTAIC CELL. 
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| 8740. |
You are given tha following four voltmeters to study the dependence of current (I) on the potential difference (V) across a resistor. Which one of the above voltmeters would you prefer to use in the circuit to begin your experiment ? |
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Answer» A |
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| 8741. |
What is eye donation ?Why is it very important ? |
| Answer» Solution :Eyes can be danated afterthedeath of a person . By doing this noble work after the death of some family member they can light the livesof TWO blind persons. Eye DONORS can beof any age group . PEOPLE who use spectacles or got cataractsurgery don.t can donate eyes. People who are DIABETIC, have high blood pressure, asthma can also donate their eyes. Eyes must be REMOVED within 4-6 hours after death. | |
| 8742. |
Give reasons for the following. Red light is used as signal lamps. |
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Answer» |
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| 8743. |
When three resistors, each of resistance R, are connected in parallel, the equivalent resistance is found out to be 10 Omega. R must be …………………. . |
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Answer» `10 Omega` Now. `R_1 = R_2 =R_3 =R` `:. 1/(R.) = 1/R + 1/R + 1/R = 3/R` `:. R = 3R. = 3(10) =30Omega` |
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| 8744. |
Radio cobalt (Co^(60)) and radio gold (Au^(198)) are used in the treatment of ........ |
| Answer» SOLUTION :SKIN CANCER | |
| 8745. |
According to the right - handthumb rule , whose direction is indicated by the thumb ? |
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Answer» Electric current |
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| 8746. |
In 1803, ______________ considered that elements consists of atoms, which are identical in nature. |
| Answer» SOLUTION :JOHN DALTON | |
| 8747. |
When a concave lens made of glass is kept in a liquid which has greater refractive index than glass then the lens behaves like a : |
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Answer» Converging lens |
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| 8748. |
What is the Importance of hydro power in India ? Describe how electric energy is generated in such plants. |
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Answer» Solution :Importance : Hydro power plants are of prime Importance as about 25 per cent of our energy requirement in india is met by hydro power plants. (i) A high rise dam is constructed at a suitable place on the river to obstruct the flow of water and thereby , collect water in LARGE reservoirs . Due to rise in water level the kinetic energy of flowing water is transformed into potential energy of stored water. (ii) The water from the high level in the dam is carried through sluice getes and pipes to the TURBINE of electric. GENERATOR , which is fitted at the bottom of the dam. Due to flowing water. turbine is rotated at a fast rate and HYDEL electricity is produced. (iii) A hydro power plant converts the potential energy of falling/stored water into electricity . |
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| 8749. |
Define electric circuit. |
| Answer» Solution :A closed path CREATED by the connecting WIRES through a battery, KEY, resistance, AMMETER, etc. is CALLED a circuit. | |
| 8750. |
(a) How chloride of lime chemically differs from calcium chloride ? (b) What happens when chloride of lime reacts with sulphuric acid ? Write chemical equation involed. (c) Mention two uses of chloride of lime. |
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Answer» Solution :(a) Chloride of lime is calcium OXYCHLORIDE `(CaOCl_(2))` while calcium chloride is `CaCl_(2)`. (b) `CaOCl_(2)+H_(2)SO_(4)rarr CaSO_(4) + Cl_(2)(g)+H_(2)O` `Cl_(2)` (Chlorine) gas is evolbed during this reaction. (c) (i) It is used for bleaching of wool and cotton in textile INDUSTRY. (ii) For disinfectiong of drinking WATER. |
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