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.
| 151. |
Which of the following letters does not show lateral inversion ina plane mirror ? |
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Answer» E HENCE, the CORRECT OPTION is (B). |
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| 155. |
If the mechanical advantage of a lever is equal to 1, then the effort applied on it ______the load. |
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| 157. |
Ram measured the length of a curved line using a thread. He made a right angled triangle, of base 10 cm and height 20 cm, with the same thread. Find the length of the curved line measured by him. |
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Answer» Length of the curved line = 10 + 20 + 10 `sqrt(5)` = 52.3 cm 
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| 158. |
What are the effects of oxides of oxides of sulphur and nitrogen on the atmosphere? |
| Answer» Solution :OXIDES of sulphur cause acid rain and inhalation of these GASES causes respiratory DISORDER . Oxidesof nitrogen cause acid rain and LEADS to the formation of smong. | |
| 159. |
What are the factors on which potential energy depends ? |
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| 160. |
Alum increases the rate of sedimentation. Why? |
| Answer» Solution :ALUM gets dissolved in water and forms clusters with clay and dust particles making them heavier thereby INCREASING the RATE of sedimentation. | |
| 161. |
Mineral from which the first magnet was found is ______ |
| Answer» Answer :C | |
| 162. |
What are the different branches of mechanic? |
| Answer» SOLUTION :MECHANICS is sub-divided into STATICS, KINEMATICS and DYNAMICS. | |
| 163. |
Which of the following water columns exerts the highest pressure on the bottom of the container? |
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Answer» 10 km |
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| 164. |
Diamagnetic substances are feeby attracted by magnets. |
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| 165. |
Define distance, displacement and sped. |
| Answer» Solution :Distance is defined as the length of the actual path travelled by a PARTICLE in motion. DISPLACEMENT is defined as the shortest distance between the INITIAL and final position of a body. Distance travelled by a particle in a UNIT TIME is known as speed. | |
| 166. |
Select the correct alternative from the given options .The gas assimilated by plants for the synthesis of proteins is _________. |
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Answer» Oxygen |
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| 167. |
Define area. |
| Answer» SOLUTION :MEASUREMENT of a SURFACE is AREA. | |
| 168. |
______ invented the periscope . |
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| 169. |
Find out an example from the following that transforms sound energy into electrical energy . |
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Answer» Microphone |
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| 170. |
The ratio of the SI unit of mass to its CGS unit is _____. |
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| 171. |
Draw the diagrams of (a) Ray of light (b) Convergent beam of light (c) Divergent beam of light (d) Parallel beam of light |
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Answer» Solution :(a) RAY of LIGHT `to` (b) Convergent beam of light  (c) Divergent beam of light  (d) PARALLEL beam of light 
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| 172. |
Mention the type of skeleton present in earthworm. |
| Answer» Solution :Earthworm does not possoess EXOSKELETON or endoskleton. It has bristls in BODY segmets called setae. MUSCLES ALONG with help in LOCOMOTION. | |
| 173. |
Observe the following flow chart and fill in the blanks with suitable process of separation and constituents of mixtures for the given reaction. |
Answer» SOLUTION :
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| 174. |
The characteristics of some gases are given . Explain how they cause pollution.(a) A colourless , odourless gas which turns lime water milky.(b)A colourless , pungent gas which turns lime water milky. |
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Answer» Solution :(a)`CO_(2)`CAUSES increase in TEMPERATURE of earth 's surface and results in GLOBAL warming . (b) |
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| 175. |
Methods of Separation: Sieving, Sedimentation, Decantation, Filteration, Evaporation |
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Answer» Solution :(a) Sedimentation can be defined as the settling down of suspended, INSOLUBLE, heavy solid particle in a solid-liquid MIXTURE. (b) Decantation can be defined as the PROCESS of pouring out the clear liquid without disturbing the sediment. |
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| 176. |
What are different type of magnets? And where are the poles located ? |
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Answer» Solution :DIFFERENT types of magnets are : BAR MAGNET : the poles are located at the ends of the bar. Horsehoe magnet : the poles are located at the two free ends of the 'U' shape. Cylinder magnet: the poles are located at the two circular ends of the cylinder. |
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| 177. |
A mixture of iron filings, saw dust and sugar is available . Explain the methods of separation of these constituents. |
| Answer» Solution :Iron filings can be SEPARATED by magnetic separation METHOD. When water is added to the mixture, SUGAR becomes soluble in water leaving behind sw dust, when this is filtered, SAW dust can be separated as a residue. The filrate saw dust can be separated as a residue. The filrate COLLECTED is sugar solution. on evaporation of this solution, water is vapourized off and sugar is left behind. | |
| 178. |
Which of the following arrangements produces a stronger electromagnet and why ? |
| Answer» Solution :CIRCUIT in the figure 'a' PRODUCES stronger electromagnet than in the figure 'b'. SINCE in both the circuit the number of TURNS of wire WOUND around magnetic material is of the same, but more cells are included in the circuit 'a'. | |
| 179. |
Which of the following arrangements produces a stronger electromagnet and why ? |
| Answer» Solution :Circuti in the figure (b) produces a strong electromagnet because the number of TURNS of wire WOUND around the MAGNETIC material is more than that in the CIRCUIT of figure (a) and the STRENGTH of magnet depends directly on the number of turns. Therefore, the magnetic material in circuit 'b' will become a stronger magnet when compared with 'a'. | |
| 180. |
The gaseous elements that do not react chemically with the other elements are known as________ |
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| 181. |
If the product of milli and micro is nano and the values of milli and nano are 10^(-3) and 10^(-9), find the value of micro. |
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Answer» `10^(3) xx` micro = `10^(-9)` Micro = `10^(-6)` |
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| 183. |
Which method is employed for the separation of constituents from a heterogeneous liquid-liquid mixture? Explain the principle involved. |
| Answer» Solution :Heterogenous liquid-liquid mixture is a mixture of two immiscible LIQUIDS which form two layers. They lighter liquid forms the upper layer while the heavier liquid forms the lower layer. They can be separated by taking the mixture in a separating funnel where the liquids get separated into two layers on STANDING. by opening the NOZZLE, the liquids in the two layers are separately COLLECTED. | |
| 184. |
_______ is the smallest unit of an element. |
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| 185. |
Maan Singh and Junna Singh are brothers. One days , Junna and Maan Singh, as usual , used unauthorized electricity by connecting the wire directly to their nearby electric poles from their respective houses. But unfortunately, Juunu's house got short circuited. Maan Singh realized what could have happened and immediately intimated anelectricity to set up a K Wh meter and started using electricity in the right way. What do you understand from this ? |
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Answer» Using authorized electric connection is safe. Hence, the correct option is (d) |
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| 186. |
Which of the following is a fundamental quantity? |
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Answer» Length |
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| 187. |
Prakash bought an electric bulb which is rated as 70 W . He knows the fact that a 70 W bulb consumes70 joules of electrical energy per second . The energy consumed by it per second is "______"ergs. |
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Answer» 700 |
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| 188. |
Find the MA of first-order lever of length 50 cm, if the fulcrum is exactly midway between the effort and load. |
Answer»  `MA=("Effort arm")/("Load arm")=(25)/(25)=1` |
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| 190. |
What are the conditions for doing a work ? |
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| 191. |
According to Newton's theory of light the rectilinear propagation of light is due to |
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Answer» Solution :APPLICATIONS of RECTILINEAR propagationof light. (i) Occurrence of ECLIPSE (ii) Working of pinhole camera (iii) Reflecting PERISCOPE |
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| 192. |
The heating effect of effect of electric current is used in____. |
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Answer» ELECTRIC cell |
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| 193. |
Pressure at the bottom of a sea is much greater than that at its surface. Explain it |
| Answer» Solution :The force acting on surface WATER is only atmo- spheric pressure but in the bottom of the SEA the weight of water is the force acting on the bottom. Since ' P'is proportional and to ' F' pressure at the bottom of the sea is MUCH greater than that at its surface | |
| 194. |
Differentiate betweenprimary andsecondary cells. |
| Answer» Solution :`{:("Primary cell","Secondary cell"),("Cannot be rechanged","Can be RECHARGED"),("IRREVERSIBLE chemical","Reversible chemical"),("REACTION tekes PLACE in this cell","reaction takes place in this cell."),("These are also known as 'use and throw' type cells.","These are also known as accumulators."):}` | |
| 195. |
Rice grains and husk can be separated by the method of____. |
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Answer» SIEVING HENCE, the correct OPTION is (d). |
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| 196. |
Which of the following is different from the others? |
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Answer» DISTANCE COVERED |
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| 197. |
Akash can move an iron block at rest ,placed on a metal sheet by pushing it with a force of 50 N. Whena lubricant is applied on the effort is reduced to do the same activity .The force with which the block can be moved in the second case is "________". |
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Answer» 25 N Therefore , the force applied to move the block is `F=F-F/4= 50 - 50/4` =50- 12.5= 37.5 N HENCE , the correct option is (B) |
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| 198. |
The method to reduce consumption of electricity is ______. |
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Answer» To use tube lights instead of CFL's |
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| 200. |
Select the correct alternative. |
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Answer» Carbon dioxide |
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