InterviewSolution
Saved Bookmarks
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.
| 2101. |
what is the direction of electric current in terms of potential difference ? |
| Answer» SOLUTION :ELECTRONS MOVE from LOW potential to HIGH potential. | |
| 2102. |
A person cannot see objects further than 10 metres from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected ? Draw a diagram for (i) defect of vision and also (ii) for its correction. |
|
Answer» Solution :Student is having myopia which is CAUSED by (i) EXCESSIVE CURVATURE of the eye lens or (i) elongation of eyeball RESULTING in focusing of image in front of retina. Thus, the distant images are blurry but the nearby images are clear. myopia can be corrected by using a concave lens of suitable power which diverges the light rays and makes the image formed on the retina as SHOWN. 
|
|
| 2103. |
The equivalent resistance between points A and B of the following electric circuit willbe ………….. . |
|
Answer» `4 Omega`  It is clear from the circuit that resistors `R_1 and R_2` are connected in series. `:. R. = R_1 + R_2 = 4 +4 = 8 Omega` Now, R. is connected with `R_3` in parallel COMBINATION. `:. 1/R = 1/R. + 1/R_3` `= 1/8 + 1/8` `= 2/8 = 1/4` `:. R =4 Omega` |
|
| 2104. |
The focal length of a convex lens is 18 cm and the size of the image is a quarter of the object. The object is situated at a distance of |
|
Answer» 90 cm Using lens formula `(1)/(v) - (1)/(u) = (1)/(f)`, we have `(1)/(+(u//4)) - (1)/((-u)) = (1)/((+18)) rArr (4)/(u) + (1)/(u) = (5)/(u) = (1)/(18) rArr u = 90` cm |
|
| 2105. |
When a spaceship is two Earth radii distance from the centre of Earth, its becomes_________________. |
|
Answer» |
|
| 2106. |
Pavni's mother had just washed all the white clothes. She was telling her friend that the whiteness of white clothes was decreasing with every wash and even new white clothes appeared to be like old ones after a few washings. Pavni, who is a student of class 10, was listening to her mother's complaint. Pavni then went to the market and purchased a particular 'dye'. She asked her mother to dissolve a little of this dye in a bucketful of water and soak the washed white clothes in the solution of dye for some time. Pavni's mother did the same. After sometime, the clothes were taken out of the bucket, rinsed well and spread on clothes line for drying. Pavni's mothers observed that the whiteness of washed white clothes had increased a lot after applying a little of the dye. Pavni's mother did not know why on applying little of a certain dye to washed white clothes, their whiteness had increased manifolds. Pavni explained everything to her mother. (a) What could be the 'dye' applied by Pavni's mother to the washed white clothes by dissolving in water ? (b) What does the application of this dye make the washed white clothes look even more white (or shining white) ? Explain. (c) What values are displayed by Pavni in this episode ? |
|
Answer» Solution :(a) The dye applied by Pavni's mother to the washed white clothes is 'blue' ('blue colour' or 'neel'). (b) The white sunlight is a mixture of seven coloured LIGHTS, violet, indigo, blue, green, yellow, orange and red (which is called spectrum). Now, when the white sunlight consisting of seven different colours comes down through the atmosphere, then some of its blue colour is scattered by air molecules PRESENT in the atmosphere (causing the blue colour of the sky). In this way, the white sunlight BECOMES somewhat deficient in blue colour. When this sunlight (having deficiency of blue colour) falls on washed white clothes to which 'blue colour' (or neel) has been applied, then the deficiency of blue colour in white sunlight is made up. The white sunlight reflected from the washed white clothes now has all the colours of the spectrum in the right proportions and this makes the white clothes APPEAR extremely white. (c) Pavni DISPLAYED the values of (i) Knowledge of scientific facts (such as composition of sunlight, spectrum and scattering of light) (ii) Application of knowledge in real life situations (such as to make washed white clothes look more white), and (iii) Desire to help mother by solving her problem. |
|
| 2107. |
Distinguish between the resistivity and conductivity of a conductor . |
Answer» SOLUTION :
|
|
| 2108. |
On the basis of your understanding of the following paragraph and the related studied concepts :Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world's fifth largest wind-power producer and the largest windmill failities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind - farm in the state. It uses wind from the Arbian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.The electrical generators used on wind turbines in sites like Muppandal, produce an output a.c. of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increased to increase or decrease the voltage so it is compatible with the end usage, distribution or trasmission voltage, depending on the type of interconnection.Based on the data represented in the graph below, which of the two cities A or B would be an ideal location for establishing a wind - farm and why ? |
| Answer» Solution :CITY A could be an ideal location for a wind form as there is CONSISTENTLY HIGH wind speed in that city throughout the year. | |
| 2109. |
What is resultant force ? |
| Answer» SOLUTION :When SEVERAL forces act simultaneously on the same body, then the combined effect of the MULTIPLE forces can be REPRESENTED by a SINGLE force, which is termed as .resultant force.. | |
| 2111. |
Explain electrical energy and derive its formula. Obtain Joule.s law of heating. |
Answer» Solution :A metallic conductor (or a resistance WIRE) OFFERS resistance to the flow of current, so work must be done by the current-source for a continuous flow of electric current through a conductor.  Consider a current I flowing through a resistor (or conductor) of resistance R. Let V be the potential difference across the resistor (see figure). Let t be the time-INTERVAL during which a charge Q flows through the resistor (conductor). The work done by the current source in moving charge Q through a potential difference V is vg. Therefore, the current source must supply energy to the circuit equal to VQ in time t. Thus, energy spent by the source or thework done by the source, `W = VQ` `= V ("It") ( :. I = Q/t)` `=(IR) ("It")` (By the Ohm.s law V =IR) `:. W = I^2Rt... ....(12.15)` This electrical energy gets dissipated as heat in the resistor. Thus for a steady current I, the amount of heat H generated (produced) in time- interval t is `H = I^2 Rt`.......(12.16) This is known as the JOULE.s law of heating. The SI unit of electrical energy and heat energy is the joule (J). Its other units are watt-second (Ws) and kilowatt-hour (kWh) or unit (commercialunit for electrical energy). |
|
| 2112. |
Which of the following represents the regulativde function of forest ? |
|
Answer» Storage and release of gases |
|
| 2113. |
Draw neat and labelled diagrams. Schematic for power plant based on natural gas |
Answer» SOLUTION :
|
|
| 2114. |
……………………… of a body is defined as the quantity of matter contained in the object. |
| Answer» SOLUTION :mass | |
| 2115. |
What is the function of Vasopressin? |
| Answer» Solution :Vasopressin or anti diuretic hormone increase the reabsorption of water in KIDNEY. SINCE it REDUCES the LOSS of water through urine. It is also known as anti-diuretic hormone. | |
| 2116. |
The unit used to measure the energy of smaller particles is _________. |
| Answer» SOLUTION :ELECTRON VOLT (EV) | |
| 2117. |
The sources of energy which are being produced continuously in nature and are inexhaustible, are called |
|
Answer» CONVENTIONAL sources |
|
| 2118. |
The angular velocity of second's hand of a watch will be. |
|
Answer» `60 PI " RAD"//s ` |
|
| 2119. |
An electric refrigerator rated 400 W operates 8 hours/day. What is the cost of the energy to operate if for 30 daysat Rs 3.00 per kWh ? |
|
Answer» SOLUTION :The total energy consumed by the refrigerator in 30 days would be 400 W `xx` 8.0 hour/ day `xx` 30 days = 96000Wh = 96 kWh ( `:. 1kWh = 10^3 Wh`) Thus, the cost of the energy to operate the refrigerator for 30 days is `96 kWh xx RS 3.00` per kWh = Rs288.00. |
|
| 2120. |
(i) "Stars seem higher than they actually are" (ii) "The sky appears dark to passengers flying at very high altitudes" Justify these statements with reason. |
|
Answer» Solution :(i) Light coming from the stars are SUPPOSED to travel in a straight line. But the refractive index of air is not same throughout. It changes as HOT air is rarer than cold air. So refraction takes place. In this case, starlight continuously travels from a rarer medium to a denser medium. Hence, it continuously bends towards the NORMAL. The continuous BENDING of starlight towards the normal results in a rise of the apparent position of the star. (ii) Scattering of light take place because of the particles present in atmosphere. At high altitude due to absence of atmosphere scattering of light do not take place and hence sky appears DARK to passengers flying at high altitude. |
|
| 2122. |
When do we consider a person to be myopic and hypermetropic?Explain using diagrams how the defects associated with myopic and hypermetropic eye can be corrected? |
|
Answer» Solution :Myopic This term is used to define short sightedness. Light from a distant object forms an image before it reaches the retina. This could be because the eye is too LONG or the cornea or crystalline LENS is too strong. A myopic person has clear vision when looking at objects CLOSE to them but distant objects will appear blurred.  Tocorrect this defects a concave lens (MINUS powered) is placed in front of a myopic eye, moving the image back to the retina and clarifying the image.  Hypermetropic It means long sightedness, and, in which the image of a nearby object is formed behind the retina.This could be because the eye is too short or the cornea or crystalline lens does not refractthe light enough. A hypermetropic person may have blurred vision when looking at objects close to them and clearer vision when looking at objects in th distance.  To correct this defectsa CONVEX lens (plus powered) in front of a hypermetropic eye, the image is moved forward and focuses correctly on the retina. 
|
|
| 2123. |
A student uses spectacles of focal length - 2.5 m. List two main causes of developing this defect. |
|
Answer» Solution :Two MAIN CAUSES of myopia are : (i) excessive curvature of the EYE LENS (ii) ELONGATION of the eye ball. |
|
| 2124. |
The home electrical connection consists of ... : ........ , ............ and ............ wires. |
| Answer» SOLUTION :LIVE, NEUTRAL, EARTH | |
| 2125. |
"Solving the problem of pollution is an effective way of environmental management." Justify the statement. |
|
Answer» Solution :(1) Pollution is created only due to human activities. AIR, water, SOIL, noise, radiation, thermal, light, plastic are different types of pollution. (2) All types of pollution affect the environment and particularly threatening the SURVIVAL of living organisms. (3) Pollution must be controlled in order to have good quality of the environment. E.g. When plastic is thrown anywhere, it causes pollution of the land, it clogs the rain water drains, it affects feeding of the animals. Plastic pollution can be completely stopped by us through PROPER management of plastic waste. By recycling or reusing, we can overcome the plastic pollution. This would be a powerful way of environmental management. (4) Similarly, when we reduce pollution of different types, we automatically help to regain the environmental health. |
|
| 2126. |
Which of the following will undergo addition reactions ? |
| Answer» Answer :D | |
| 2127. |
Draw images formation due to refraction through a concave lens. |
|
Answer» SOLUTION :Object at Infinity: (i) When an object is placed at infinity , a virtual IMAGE is formed at the focus. (ii)The SIZE of the image is much smalle than that of the object.  Object anywhere on the PRINCIPAL axis at a finite distance: (i) When an object is placed at a finite distance from the lens, a virtual image is formed between pole adn focus of the convex lens. (ii) The size of the image is smaller than thatof the object . 
|
|
| 2128. |
Ability of the eye to see objects at all distances is called : |
|
Answer» presbyopia |
|
| 2129. |
Find the torque of a force 7hati - 3hatj - 5hatk about the origin which acts on a particle whose position vectors is hati + hatj - hatk |
| Answer» Solution :`vectau = vecr xx VECF = |{:(HATI, hatj, HATK),(1,1,-1),(7,-3,-5):}| =-8hati -2hatj - 10 hatk` | |
| 2130. |
In the figure, AB is an object of height 2 cm. The position and height of the image formed are : |
| Answer» Answer :C | |
| 2131. |
Sneha and Sugandha are friends. Sneha belongs to a rich family and she believes in throwing and discarding the things after use while Sugandha does not like wastage and she reuses the things. On the basis of the above information answer the following questions. (i) How does reusing the things avoid wastage? (ii) List any two examples where you can reuse the things. (iii) What change can you make in your habits to become more eco-friendly. (iv) What values are showed by Sugandha? |
|
Answer» SOLUTION :(i) Reusing means using the THINGS again and again, thus without wastage of any energy we can use the things. (II) Old envelopes can be reused, old newspapers can be used to make cards, pots, decorative pieces, etc. (iii) By adopting the principles of three R's we can make our selves eco-friendly. (IV) CONCERN for environment, social concern. |
|
| 2132. |
Orientation problemsymptoms is likely to affect an astronaut in space . |
| Answer» SOLUTION :AFFECT in SPACE | |
| 2133. |
What is the highest |
|
Answer» Solution :`1/R=1/(4Omega)+1/(8OMEGA)+1/(12OMEGA)+1/(24Omega)` `=(6+3+2+1)/(24)Omega` `=(12)/(24)Omega=1/2Omega` When all the resistors are connected in PARALLEL Thus, R=`2Omega` |
|
| 2134. |
In which type of lens linear magnification is always less than one ? |
| Answer» Solution :CONCAVE lens always has LINEAR MAGNIFICATION LESS than one, because it always gives diminished images. | |
| 2135. |
(a) Write the mathematical expression for Joule's law of heating.(b) Compute the heat generated while transferring 96000 coulomb of charge in two hours through a potential difference of 40 V. |
|
Answer» SOLUTION :(a) As per mathematical expression for Joule.s law of heating Heat produced H = VIt =`I^2Rt=(V^2)/(R)t` When a voltage V is applied across a resistance R for time t so that a current I flows through it. (B) Here charge Q = 96000 C, time t = 2 h and potential difference V = 40 V `therefoe` Heat generated H=VIt = VQ `implies`H = 40 x 96000 = 3840000 J = 3.84 x `10^6`J |
|
| 2136. |
Shark , Sting ray, Electric ray, Pomfret |
| Answer» Solution :POMFRET. (Pomfret is a BONY FISH, all the REMAINING are CARTILAGINOUS fish.) | |
| 2137. |
Figure shows the section of a semi-circular glass slab having its centre at O. three rays of light A,B and C of the same colour are incident on the slab and strike on the edge XY at the point O. the light ray B suffers refraction along OB'. (a) On the diagram, mark the critical angle by C. (b) The rays enter the slab undeviated. give reason. (c) Draw the path of rays A and C after they strike the edge XY. (d) Name the phenomenon which the rays A and C exhibit. |
Answer» Solution :(a) In FIGURE, the critical angle has been marked as C which is the angle of incidence for the ray B.  (b) Each of the rays A, B and C is incident normally on the SLAB along its radius, so it enters the slab undeviated. (c) Figure shows the PATH of the rays A and C after they strik the edge XY and OA. and OC. RESPECTIVELY. (d) The ray A suffers refraction from glass to air while the ray C suffers TOTAL internal reflection. |
|
| 2138. |
The power plant in which natural source of energy is directly used to rotate turbines is |
|
Answer» thermal POWER PLANT |
|
| 2139. |
Where is nerve cord of chordate animals located ? |
| Answer» Solution :In all the chordate animals ,NERVE CORD is LOCATED on the dorsal SIDE of the body . | |
| 2140. |
Elements used for solar cell are |
|
Answer» SILICON |
|
| 2141. |
Spontaneous emulsion of radiation on their own is called ____________. |
| Answer» SOLUTION :NATURAL RADIOACTIVITY | |
| 2142. |
a) Explain why, a real image can be projected on a screen but a virtual image cannot. b) Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principle focus should be shown clearly. c) Name one simple optical instrument in which the above arrangement of convex lens is used. |
| Answer» SOLUTION :C) A SIMPLE CAMERA | |
| 2143. |
Which different methods are used for transportation of patients? Why? |
|
Answer» Solution :The different methods used for transportation of patients, vary depending on their condition. some of these methods are as follows: i. Cradle method: This method is useful for carrying children and under weight VICTIMS. ii. Carrying piggy back: This method is useful for carrying an unconscious patient. iii. Human crutch method: This method is HELPFUL for supporting a patient with one injured leg or those who require minimal assistance. iv. Pulling or lifting method: This method is useful for carrying an unconscious patient. v. Two HAND chair method: This method is useful for helping patients who can holdtheir body upright but are unable USE their legs. vi. Four hand chair method: This method is useful for helping patients who need support below their waist. vii. Stretcher: This method is useful for carrying an unconscious or a very badly injured person. One can use conventional stretcher if it is available. However, in case of an emergency, a temporary stretcher can be made using bamboos, blanket, ETC. |
|
| 2144. |
Positron is an______________. |
| Answer» SOLUTION :ANTIPARTICLE of ELECTRON | |
| 2145. |
A body strikes the floor vertically with a velocity u and rebounds at the same speed. The change inspeed would be |
|
Answer» UNIFORM ACCELERATION |
|
| 2146. |
Mention the condition under which charges can move in a conductor. Name the device which is used to maintain this condition in an electric circuit. (b) A current of 2A passes through a circuit for 1 minute. IF potential difference between the terminals of the circuit is 3V, what is the work done is transferring the charge? |
|
Answer» Solution :Electric charges can MOVE in a conductor when a potential DIFFERENCE is maintained ACROSS its ends. As electric cell is used to maintain potential difference across the conductor and thus can be used for flow of charges (i.e., flow of current) (b) Here I=2A time t=1 MINUTE =60s and V=30V `therefore` Total charge flowing `q=It=2 times 60=120 C` `therefore` Work done `W=qV=120 times 3=360 J` |
|
| 2147. |
State the advantages and disadvantages associated with hydroelctric power plant. |
|
Answer» Solution :Advantages of hydroelectric power PLANT : (i) No fuel is BURNT in a hydroelectric power plant . THUS, no AIR pollution dueto combustion of fuel occurs. (ii) Electricity can be generated whenever required if the dam has sufficient water storage. (iii) During rainy season, the water in the water reservoirs can be REPLENISHED and used for power generation. |
|
| 2148. |
What is Doppler effect? Derive the formula for the change in apparent frequency (i)Both source and listener move towards and away from each other. (ii) Both source and listaner move one behind the other source follows the listener and listener follows the source. (iii) Source at rest, listener moves towards and away from the source. (iv) Listener at rest, source moves towards and away from the listener. |
Answer» SOLUTION :    
|
|
| 2149. |
Water, Sunlight, Decomposers, Soil. |
|
Answer» SOLUTION :DECOMPOSERS Decomposers are biotic factors of an ecosystem, whereas OTHERS are ABIOTIC factors of an ecosystem. |
|
| 2150. |
One word is incorrect in the statement . Change it to make the statement correct : Heart if present in the non -chordates is on ventral side of body . |
| Answer» Solution :Heart if PRESENT in the NON - chordates is on DORSAL side of body. | |