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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.
| 2151. |
If height of the satellite's orbit increases, the critical velocity .. ........ . |
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Answer» increases |
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| 2152. |
Explain the following terms related to spherical lenses :(i) Centers of curvature (ii) Principal axis(iii) Optic centre(iv) Radii of curvature(v) Principal focus(vi) Focal length and(vii) Linear aperture. |
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Answer» SOLUTION :(i) Each spherical surface of a spherical lens forms a part of a SPHERE. The centres of these SPHERES are called the centres of curvature. (ii) The principal axis of a lens is a imaginary line passing through its two centres of curvature. (iii) The central point of a lens is called its optical CENTRE. A ray of light passes undeviated through the optical centre of any lens. (iv) The radii of two spherical surfaces of the lens are called radii of curvature. (v) The point on the principal axis, at which incident light rays parallel to the principal axis converge or appear to diverge from, is called the principal focus of the lens. (vi) The distance between the optical centre and the principal focus of a spherical lens is called its focal length. (vii) The aperture of a spherical lens is the diameter of its circular outline. |
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| 2154. |
What do you mean by -ve and +ve sign of magnification ? |
| Answer» Solution :Negative magnification SIGNIFIES a REAL and iverted IMAGE and positive sign of magnification means a VIRTUAL and ERECT image. | |
| 2155. |
Why are magnetic field lines closed curves ? |
| Answer» SOLUTION :The MAGNETIC field lines originate from north POLE of a magnet and end at its south pole. INSIDE the magnetthey are directed from south pole to north pole. So, themagnetic field lines are closed CURVES. | |
| 2156. |
Sketch and label human female reproductive system. Is the woman responsible for sex determination of child? Justify your answer? |
Answer» Solution :(1) Human female reproductive SYSTEM.  (2) WOMAN is not responsible for sex determination of CHILD. |
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| 2157. |
A projectile rises to a height of 10 m and then falls at a distance of 30 m away from the projection. Its vertical displacement is |
| Answer» Solution :Since the projectile returns to the PLANE of projection THEREFORE the net displacement is zero. | |
| 2158. |
How much longer than a microsecond is a millisecond ? |
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Answer» `10^3` |
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| 2159. |
No matter how far you stand from a spherical mirror, your image appears erect. The mirror is likely to be |
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Answer» PLANE |
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| 2160. |
Observe the images 9.6, 9.7and 9.8 given in your textbook. It is rational ? Why ? |
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Answer» Solution :No, the incidents shown in the GIVEN images are not rational. i. Image `9.6:` It is incorrect to use mobile PHONE while having meal. Children focus more on mobile phone and tend to swallow food without PROPER chewing. This may lead to choking, overecting and other related problems. ii. Image `9.7:` Taking selfies on road may lead to severe injuries or death, as the person beomes so engrossed in clicking selfie that he is not AWARE about the world around him. Image `9.8:` Clicking pictures and recording videos of an accident VICTIM is not correct. If a person meets with an accident, the people around him must help the victim and cell for medical assistance immediately. |
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| 2161. |
Consider two containers A and B containing identical gases at the same pressure, volume and temperature. The gas in container A is compressed to half of its original volume isothermally while the gas in container B is compressed to half of its original value adiabatically. The ratio of final pressure of gas in B to that of gas in A is |
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Answer» `2 ^(GAMMA-1)` `P_2=(P_1V_1)/V_2=P_1=V_1/(V_1//2)=2P_1` For gas in B, when compression is adiabatic `P_2V_2^gamma =P_1V_1^(gamma)` `P_2=P_1(V_1/(V_1//2))^gamma=2^(gamma)P_1` So `P_2/P_1 =(2^(gamma)P_1)/(2P_1) = 2^(gamma-1)` |
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| 2162. |
In esterfication |
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Answer» Solution :A CARBOXYLIC acid REACTS with an alcohol in PRESENCE of an acid catalyst , an ester is formed .The reaction is known as esterification. `underset("Acid")(CH_(3))-C"OO"H + CH_(3) -underset("alcohol")(CH_(2))-OH underset("catalyst")overset("acid")to underset("Ester")(CH_(3)C"OO"C_(2)H_(5))+H_(2)O` |
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| 2163. |
How will use two identical glass prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light ?Draw and label the ray diagram. |
Answer» Solution :We use two IDENTICAL prisms `P_(1)` and `P_(2)` and PLACE them in mutually opposite directions so that a narrow BEAM of white light incident on first prize `P_(1)` emerges out of the second prism `P_(2)` as a beam of white light the labelled ray diagram has been DRAWN here. 
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| 2164. |
Defects of vision and their correction. |
Answer» SOLUTION :
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| 2165. |
In the above circuit, connect a nichrome wire of length ' between points X and Y and note the ammeter reading. (i) When this experiment is repeated by inserting another nichrome wire of the same thickness but twice the length (2L), what changes are observed in the ammeter reading ? (ii) State the changes that are observed in the ammeter reading if we double the area of cross-section without changing the length in the above experiment. Justify your answer in both the cases. |
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Answer» Solution :(i) The AMMETER reading will decrease (becomes half). This is because with the increase in length, resistance of the circuit increases, HENCE CURRENT decreases, . (ii) The ammeter reading will increase (becomes two TIMES). This Is because as area increases, resistance decreases and hence current increases. |
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| 2166. |
An electric heater rated 800 W operates 6h/day. Find the cost of energy to operate it for 30 days at ₹ 3.00 per unit. |
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Answer» SOLUTION :Energy consumed `=Pxxt =800xx6xx30` =144000 Wh =144 kWh. COST of ELECTRICITY = `144xx3 = ₹ 432. |
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| 2167. |
Which of the following is true for ice // water? |
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Answer» expands on melting and CONTRACTS on FREEZING |
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| 2168. |
The location of a particle has changed. What can you say about the displacement and the distance covered by the particle? |
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Answer» ONE MAY be zero |
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| 2169. |
A body at a temperature of 727^(@)C and having surface area 5 cm^(2), radiations 300 J of energy each minute. The emissivity is(Given Boltzmann constant =5.67xx10^(-8) Wm^(-2)K^(-4) |
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Answer» e = 0.18 So `e=Q/(sigmaT^4 "At")=300/((5-67xx10^(-8))xx(1001)^4XX(5xx10^(04))xx60)` = 0.18 |
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| 2170. |
Namethe scientist who firstsuggested thata forcewouldact on a current - carrying wire placed in a magnetic fiel . |
| Answer» SOLUTION :AMPERE . | |
| 2171. |
Which one of the following represents a renewable source of energy ? |
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Answer» PETROLRUM |
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| 2172. |
Remediation is the process of removing dangerous or poisonus substances from the environment, or limiting the effect that they have on it. When any biological orgnisum is used for remediation, it is called bioremdiation. When any biological organism is used for remediation, it is called bioremediation. When plant species are used for the purpose of remediation, it is called phytoremdiation. The methods of such remediation have helped to clean the environment from toxic effluents, especially sewgae and crude oil Dr. Anand Chakraborty, a scientist of Indian origin, has worked on Pseudomonas aeruginsa which have reduced the crude oil films into carbon dioxide and water. What is the difference between phytoremediation and microbial remediation? |
| Answer» Solution :When any plant species are USED for REMEDIATION process, then it is called phytoremediation, whereas when any mircobe species used for remediation then it is called MICROBIAL remediation. | |
| 2173. |
Explain the term with example : Hetero atom in a carbon compound |
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Answer» Solution :Carbon compounds are formed by FORMATION of bonds of carbon with other elements such as halogens, oxygen, nitrogen , sulphur. The ATOMS of these elements substitute ONE or more hydrogen atoms in the hydrocarbon chain and thereby the tetravalency of carbon atoms in the hydrocarbon chain and thereby the tetravalency of carbon is satisfied. The ATOM of the element which is substitute for hydrogen is referred to as a hetero atom. Sometimes hetero atoms are not alone but exist in the FORM of certain groups of atoms. Example : 
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| 2174. |
Fertilization |
| Answer» SOLUTION :The process by which two haploid gametes UNITE to form a diploid zygote is CALLED FERTILIZATION. | |
| 2175. |
Remediation is the process of removing dangerous or poisonus substances from the environment, or limiting the effect that they have on it. When any biological orgnisum is used for remediation, it is called bioremdiation. When any biological organism is used for remediation, it is called bioremediation. When plant species are used for the purpose of remediation, it is called phytoremdiation. The methods of such remediation have helped to clean the environment from toxic effluents, especially sewgae and crude oil Dr. Anand Chakraborty, a scientist of Indian origin, has worked on Pseudomonas aeruginsa which have reduced the crude oil films into carbon dioxide and water. Which environmental pollutant is mainly removed through bioremediation processes? |
| Answer» SOLUTION :Toxicants released through SEWAGE and crude oil are REMOVED by biormediation processes. | |
| 2176. |
As the mass of a rocketdecreases with altitude , it its ____ increases. |
| Answer» SOLUTION :VELOCITY | |
| 2177. |
Remediation is the process of removing dangerous or poisonus substances from the environment, or limiting the effect that they have on it. When any biological orgnisum is used for remediation, it is called bioremdiation. When any biological organism is used for remediation, it is called bioremediation. When plant species are used for the purpose of remediation, it is called phytoremdiation. The methods of such remediation have helped to clean the environment from toxic effluents, especially sewgae and crude oil Dr. Anand Chakraborty, a scientist of Indian origin, has worked on Pseudomonas aeruginsa which have reduced the crude oil films into carbon dioxide and water. What is the meaning of remediation: |
| Answer» Solution :Remediation is theprocess by which the DANGEROUS or TOXIC SUBSTANCES are REMOVED from the environment. | |
| 2178. |
Show that in an elastic one dimensional collision the relative velocity of approach before collision is qual to the relative velocity of separation after collision. |
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| 2179. |
Remediation is the process of removing dangerous or poisonus substances from the environment, or limiting the effect that they have on it. When any biological orgnisum is used for remediation, it is called bioremdiation. When any biological organism is used for remediation, it is called bioremediation. When plant species are used for the purpose of remediation, it is called phytoremdiation. The methods of such remediation have helped to clean the environment from toxic effluents, especially sewgae and crude oil Dr. Anand Chakraborty, a scientist of Indian origin, has worked on Pseudomonas aeruginsa which have reduced the crude oil films into carbon dioxide and water. Why Dr. Anand Chakarborty's work phenomenal? |
| Answer» Solution :De. Anand Chakraborty discovered that Pseudomonas aeruginosa BACTERIA can act on oil film which is toxic and reduce if to nontoxic products. This helps in controlling the oil pollution of marine WATERS which otherwise is very difficlt to CONTROL. | |
| 2180. |
How does the magnitude of the magnetic field produced by a current carrying circular loop at its centre related to the current flowing inside the loop ? |
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Answer» Solution :The magnitude of the magnetic field PRODUCTION by a current - carrying circular LOOP at its centre is : DIRECTLY proportional to the current PASSING through the circular loop and Inveresly proportional to the radius of circular loop (or circular WIRE) |
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| 2181. |
A heavy truck and bike are moving withthe same kinetic energy . If the mass of the truck is four timesthat of the bike , then calculate the ratio of theirmomenta . (Ratioof momenta = 1:2) |
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Answer» Solution :(i) GIVEN: Let `m_(b),m_(1)` are the masses of truck and BIKE, `m_(1)=4m_(b)`. . . (1) Here kinetic ENERGIES of both truck and bike are same `(1)/(2)m_(1)v_(1)^(2)=(1)/(2)m_(b)v_(b)^(2)`. . (2) `(1)/(2)xx4m_(b)vt^(2)=(1)/(2)m_b v_(b)^(2)` `v_(t)^(2)=v_(b)^2` `v_(t)^(2)=(1)/(4)v_(b)^(2)` `v_(t)=(1)/(2)v_(b)` To find ratio of the momenta, (i.e) `m_(1):v_(1):m_(b)v_(b)` `(P_(truck))/(P_(bike))=(m_(t)v_(t))/(m_(b)v_(b))` `=4XX(1)/(2)=(2)/(1)=2:1` (or) `(P_(bike))/(P_(truck))=(1)/(2)=1:2` (ii) `v_(T)=(v_(o)+0.16T)` `T=46^(@)C,v_(o)=331ms^(-1)` `v_(T)=331+(0.61xx46)` `=331+28.06` `v_(T)=359.06ms^(-1)`. `v_(T)=(v_(o)+0.16T)` `T=46^(@)C,v_(o)=331ms^(-1)` `v_(T)=331+(0.61xx46)` `=331+28.06` `v_(T)=359.06ms^(-1)` |
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| 2182. |
Remediation is the process of removing dangerous or poisonus substances from the environment, or limiting the effect that they have on it. When any biological orgnisum is used for remediation, it is called bioremdiation. When any biological organism is used for remediation, it is called bioremediation. When plant species are used for the purpose of remediation, it is called phytoremdiation. The methods of such remediation have helped to clean the environment from toxic effluents, especially sewgae and crude oil Dr. Anand Chakraborty, a scientist of Indian origin, has worked on Pseudomonas aeruginsa which have reduced the crude oil films into carbon dioxide and water. What is the role of Pseudomonas aeruginosa? |
| Answer» Solution :PSEUDOMONAS aeruginosa helps in bioremendiation by acting of film of crude oil and reduces it to CARBON DIOXIDE and WATER. | |
| 2183. |
Optical centre of convex lens: |
Answer» Solution :The point inside a convex lens on the principal AXIS, through which light RAYS PASS without changing their PATH, is called the optical centre of the convex lens. 
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| 2184. |
Variation in the value of g. |
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Answer» Solution :The value of g VARIES BASED on the following a. Along the surface of the earth. * The earth is not perfectly sphereical. * It is bulged at the EQUATOR and flattened at the pole, due to its rotation. * The radius is highest at the equator and least and the poles. * Value of g is highest at poles `(9.832m//s^(2))` * Value of g is least at equato `(9.78m//s^(2))` b. Change with height. * As height increases, value of g decreases. * The change is negligibkle for height SMALLER than the radius of the earth. c. Change with depth * As depth increases, value of g decreases. * This is because, as we GO inside the earth, the mass under consideration decreases. * Hence value of g decreases. |
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| 2185. |
The following four circuits have been made for studying the dependence of current on the potential difference across a resistor. The correct circuit is : |
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Answer» A |
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| 2186. |
What is scattering of light? Explain with the help of an example. |
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Answer» Solution :The PHENOMENON of change in the direction of PROPAGATION of light caused by the large number of PARTICLES present in the atmosphere is called scattering of light. Example : The PATH of beam of light BECOMES visible through a colloidal solution due to scattering of light. |
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| 2187. |
In the context of conservation of natural resources, explain the terms reduce, recycle and reuse. From among the materials that we use in daily life, identify two materials for each category. |
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Answer» Solution :In the context of natural RESOURCES, the following terms refer to Reduce This means to use a material/commodity in lesser quatity. Recycle Means a material that is used once, is collected and sent back to a manufacturer so that they can make some other useful materials from it. Recuse It means using a thing over and over again instead of throwimg it away. This is actually even better than recycling because the process of recycling uses some energy. From AMONG the materials we use in daily life, we can reduce electricity use by switching off UNNECESSARY lights and fans and save water by repairing leaky taps. Recycle use paper, plastic bottles, METAL objects can be recycled. Reuse The plastic bottles in which we buy various food-items like jam or pickle can be reused for STORING things in kitchen, the used envelopes can be reused to store things, reversed inside out to be used again. |
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| 2188. |
A cricket ball of mass 0.5 kg strikes a bat normally with a velocity of "30 ms"^(-1) and rebounds with a velocity of "20 ms"^(-1) in the opposite direction, calculate the impulse of the force exerted by the ball on the bat. |
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Answer» Solution :`"Impulse"="CHANGE in MOMENTUM"` `= m U-(-m V)` `=m(u+v)=0.5(30+20)=25Ns` |
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| 2189. |
Describe how hydro-energy can be converted into electrical energy. Write any two limitations of hydro-energy. |
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Answer» Solution :Conversion of hydro ENERGY to ELECTRICAL energy : Limitations of hydro-energy are : (i) Dams are very EXPENSIVE to BUILD. (ii) It is not the biggest source of energy on EARTH. |
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| 2191. |
Two conductors A and B of resistances 5 Omega and 10 Omega respectively are first joined in parallel and then in series. In each case the voltage applied is 20V. (a) Draw the circuit diagram to show the combination of these conductors in each case. (b) In which combination will the voltage across the conductors A and B be the same? (c ) In which arrangement will the current through A and B is the same? (d) Calculate the equivalent resistance for each arrangement. |
Answer» Solution :(a) Parallel arrangement is SHOWN in Fig,12.57 (a) and series in combination of Fig.12.57(B)  (b) In parallel combination the voltage across conductors A and B will be same. (c ) In series arrangement the current through conductors A and B is same. (d) In parallel arrangement EQUIVALENT resistance `R_p` is given by : `1/R_p=1/5+1/10=(2+1)/10=3/10 IMPLIES R_p=10/3=3.33 OMEGA` In series arrangement equivalent resistance `R_s` is given by `R_s=5+10=15 Omega`. |
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| 2192. |
Find out the source of water in your region locality. Is water from this sources available to all people living in that area? |
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Answer» Solution : In our location water is available from the FOLLOWING SOURCES: Through pipe line supply by municipal corportation department to the houses. People ALSO obtain water from hand pumps installed NEARBY. |
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| 2193. |
If the density of a planet is half without any change in its radius, how does 'g' change on the planet. |
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Answer» <P> Solution :g' gets HALF as `g propto p` (DENSITY). |
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| 2194. |
What are the properties of a good fuel ? |
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Answer» Solution :Good source of energy or fuel is one : (i) Which releases a LARGE amount of heat per unit mass of source of energy or fuel consumed. (ii) which does not produce smoke. It should not produce any POISONOUS GAS LIKE CARBON monooxide, sulphur dioxide or nitrogen peroxide. (iii) which is easily available. (iv) which does not coast much. (v) which could be easily transported from one place to another. |
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| 2195. |
A student performs an experiment with glass slab to trace the path of a ray of light entering from air into glass slab and emerging into air again. On looking carefully at the trace abtained on paper, he will observe that the emergent ray and the incident ray : |
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Answer» are CONVERGING (COMING closer to each other) |
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| 2196. |
Study these tables related to blood sugar levels and answer the questions that follow :Table A (Blood glucose chart)Identify the hormone whose level in the blood is responsible for the above disease. |
| Answer» Solution :PANCREATIC hormone - INSULIN HELPS in REGULATING blood - GLUCOSE levels. | |
| 2197. |
Name the processes of Asexual reproduction in Amoeba and Yeast fungus. |
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Answer» Solution :In AMOEBA : It is BINARY FISSION. In Yeast : It is BUDDING PROCESS |
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| 2198. |
Study these tables related to blood sugar levels and answer the questions that follow :Table A (Blood glucose chart)Refer to Table B showing the blood report of the levels of glucose of patients X and Y. Infer the disease which can be diagnosed from the given data. |
| Answer» Solution :Since Table B GIVES record of BLOOD sugar levels, HENCE we can diagnose if INDIVIDUALS X and Y have diabetes or not. | |
| 2199. |
Air brakes in automobiles work Pascal's principle. What about air brakes ? Collect the information about the working process of air brakes. |
Answer» Solution : 1. Air brakes works on the principle of conversion of energy. Generally in trains, while it is moving it produces KINETIC energy. This kinetic energy has to be REDUCED to make the train stop. Here air is used to reduce kinetic energy by converting it into heat energy. 2. The system of aer brakes in trains has been shown in the figure. 3. The important parts are compressor, main reservoir, driver's brake block. Working : 1. When the driver placed the value in application position, the air pressure in the brake PIPE escapes. 2. The LOSS of pressure is detected by the slide value in the triple value. 3. Now a connection between the auxillary reservoir and the brake CYLINDER has been opened and the air in the auxillary reservoir feeds through into the brake cylinder. 4. The air pressure forces the piston to move against the spring pressure and causes the brakes to be applied to the wheels. |
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| 2200. |
Study these tables related to blood sugar levels and answer the questions that follow :Table A (Blood glucose chart) Refer to the Table A and suggest the value of the mean blood glucose level beyond which doctor's advice is necessary : |
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Answer» 180 mg/dL |
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