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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.
| 6101. |
When the material A mined from the earth is heated strongly in an insufficient supply of air, it produces a solid fuel B which consists mainly of carbon. When another material C obtained from trees is heated in an insufficient supply of air, it produces another solid fuel D which also consists mainly of carbon. Name A, B, C and D. |
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| 6102. |
A pair of scissors is used to cut a piece of cloth by keeping it at a distance of 8.0 cm from its rivet and applying an effort of 10 kgf by fingers at a distance of 2.0 cm from the rivet. (a) Find : (i) the mechanical advantage of the scissors, and (ii) the load offered by the cloth. (b) How does the pair of scissors atc : as a force multiplier or as a speed multiplier ? |
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Answer» (ii) 2.5 KGF. (B) SPEED multiplier. |
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| 6103. |
When a satellite is moving around the earth with velocity v, then to make the satellite escape, the minimum percentage increase in its velocity should be |
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Answer» Solution :The MAXIMUM orbital velocity of a satellite orbiting near its surface is `v_(0)= sqrt(gR)= (v_e)/(sqrt(2))` For the satellite to escape gravitational PULL the velocity must BECOME `v_e` But `v_e= sqrt(2)v_(0) =1.414 v_(0)= (1+0.414)v_(0)` This means that it has to increases 0.414 in 1 or 41.4%. The minimum increment is REQUIRED, as the velocity of satellite is maximum when it is near the earth. |
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| 6105. |
Importance of pollution control : |
| Answer» Solution :The quantity of pollutants and severity of their effects on the ECOSYSTEM have to be taken into consideration constantly. The different methods of pollution control have to be used for checking the HAZARDOUS effects of pollution on the living organisms. Especially the impact of pollution on health of HUMAN BEINGS is assessed from time to time. The young children and senior citizens are affected to GREATER extent by the pollution. If the air and water required for the survival of the people is affected, then exercising the pollution control is to be done immediately. Thus, it is said that pollution control is important. | |
| 6106. |
What is meant by power of a lens? |
| Answer» Solution :The ABILITY of a LENS to converge or diverge the rays of LIGHT, is called power of lens. It is equal to the reciprocal of the focal LENGTH (i.e.`P=1/f)` | |
| 6107. |
State the obervation made by Oerseted on the basis of his experimentwithcurrent- carrying conductors ? |
| Answer» SOLUTION :A CURRENT- CARRYING conductorhas a MAGNETIC FIELD aroudn it . | |
| 6108. |
Define electric power. A device of resistance R is connected across a source of V voltage and draws a current I. Derive an expression for power in terms of voltage and resistance. |
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Answer» Solution :Rate at which electric ENERGY is dissipated in an electric CIRCUIT. `P=(V.Q)/(t) = V.I =VXX(V)/(R) = (V^(2))/(R)` |
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| 6109. |
The minimum amount of charge observed so far is |
| Answer» Solution :`1.6 xx 10^(-19C)` | |
| 6111. |
We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the rante of distance of the object from the mirror? What is the of the image? Is the image larger or smaller than the object? Draw a ra diagram to show the image formtion in this case. |
Answer» Solution :Object must be placed between pole and FOCUS of the mirror. So, range of distance object from the mirror is less than 15 cm from the pole of the mirror. Image will be virtual erect and larger than the SIZER of the object. 
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| 6112. |
While applying Fleming's right-hand rule the central (middle) finger of right-hand indicates |
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Answer» the direction of magnetic field. |
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| 6113. |
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be : |
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Answer» PLANE |
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| 6114. |
A particle revolves round a circular path. The acceleration of the particle is inversely proportional to- |
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Answer» radius `a alpha 1/r` |
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| 6115. |
What kindof lens is used by a myopic person ? Explain with a diagram. |
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| 6116. |
Why does a current-carrying conductor experience a force when it is placed in a magnetic field ? |
| Answer» SOLUTION :A current-carrying conductor produces a MAGNETIC FIELD AROUND it which interacts with the externally applied magnetic field and so the conductor experiences a FORCE. Force on the conductor | |
| 6117. |
What is the role of the split ring in an electric motor ? |
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Answer» Solution :1. The split ring in the electric motor is ALSO known as a commutator. 2. It reverses the direction of CURRENT flowing through the coil after EVERY half rotation of the coil. 3. Due to this, the coil continues to ROTATE in the same direction. |
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| 6118. |
What is the lowest total resistance that can be secured by combinations of four coils of resistance 4Omega,8Omega,12Omega,24Omega |
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Answer» Solution :(a) HIGHEST ( by connecting in series ) = 4+ 8 + 12 +24 series = `48 Omega` (B) Lowest ( by connecting ) in parallel = `(1)/(R_(p))= (1)/(4) + (1)/(8) +(1)/(12)+(1)/(24)` `=(12)/(24) ` `(1)/(R_(p))=(1)/(2)` `R_(p)=2 Omega` |
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| 6119. |
Syngamy resultsin theformationof _______. |
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Answer» Zoospores |
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| 6120. |
What are the material required to make a simple circuit ? |
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Answer» Solution :1. A BULB 2. A battery 3. COPPER wires 4. switch. |
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| 6121. |
State the advantages and disadvantages of using tidal energy. |
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Answer» Solution :Advantages of using tidal energy: (a) it is a REVERSIBLE energy source. (b) lt does not cause any pollution. (c) Once constructed, there is no further cost involved. Disadvantages of using tidal energy : (a) It cannot produce large AMOUNTS of electricity. (b) it brings about major ecological changes in the sensitive ecosystem of coastal reglons. (c) Tidal-power station, at the MOUTH of a river, BLOCKS the flow of polluted water into the sea, creating health and pollution hazards in the estuary. |
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| 6122. |
Process of transfer of heat in the form of electromagnetic wave (light) for which material medium not necessary is |
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Answer» conduction |
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| 6123. |
Explain the experiment conducted by Newton to show that white light contains seven colours. |
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Answer» Solution :Light rays of DIFFERENT COLOURS travel with same speed in vacuum and air. But in any other medium, they travel with the different speeds and bend through different angles, which lead to the dispersion of light. Newton showed that the reverse of dispersion of light is also possible. He kept two identical prisms close to each other-one erect and the other in an inverted POSITION as shown in the figure. The light gets dispersed when it passes through the first prism. The SECOND prism receives all the seven coloured rays. from first prism and recombines them into the original white light. This obervation show that sunlight is made up of seven colours.  it is essential that the two prisms used should be identical and placed in inverted position with respect to each other because then, the second prism CANCELS the dispersion caused by the first prism so that white light can be obtained. |
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| 6124. |
Assertion (A) : Speed of light in water is 2.25 xx 10^(8) ms^(-1) Reason (R) : The refractive index of water is 4/3. |
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Answer» Both (A) and (R) are true and (R) is CORRECT EXPLANATION of the assertion. |
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| 6125. |
For a spherical mirror focal length 'f' and radius of curvature 'R' are correlated as : |
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Answer» f = R |
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| 6126. |
Thesolutionof Al_(2)(SO_(4))_(3)in waterin notclear , becauseof ______. |
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Answer» Impurityin THESALT |
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| 6128. |
Describe an activity to demonstrate that abar magnet has a magnetic field around it. |
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Answer» Solution :To observe magnetic filed lines around a bar magnet : FIGURE : PATTERN formed by iron filingsaround a bar magnet represents its magnetic filed. 1] Stick a white sheet on a drawing board USING gunor glue. 2] Placea bar magnet at thecentre of the sheet. 3] Spread some iron FILINGS uniformly around the bar magnet using salt sprinkler . Tap theboard gently and observe the patternformed. Inference : The iron filingsexperience magnetic force exerted by the magnet. Hence ,t hey arrangethemselvesin a pattern consisting of lines which represent magneticlines of force.Theregion surroundingthe magnet in which these lines of force can be DETECTED constitutemagnetic fieldproduced by the magnet. 
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| 6129. |
Which of the following is the best set-up for tracing the path of a ray of light through a rectangular glass slab ? |
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Answer» A |
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| 6130. |
Name any two component andits use ? |
Answer» SOLUTION :
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| 6131. |
Complete the following sentence : A generator with commutator products ……… current. |
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| 6132. |
Figure, shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in a ideal case. |
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| 6133. |
Only humans can conserve and improve the quality of nature. |
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Answer» Solution :i. There is an inter-relationship between humans and the environment. II. In an attempt to live a SATISFACTORY life, humans over-utilized natural RESOURCES. iii. Natural resources are depleting in nature. Humans need to conserve and improve its QUALITY in order to maintain the environmental balance. iv. Humans are responsible for the DETERIORATION of nature and its components. Hence, only humans can conser and improve the quality of nature. |
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| 6134. |
The defect in eye due to which the old people cannot see nearby objects clearly |
| Answer» SOLUTION :PRESBYOPIA | |
| 6135. |
Why do different colours get separated when white light passes through a prism? How can we recombine the components of white light after a prism has separated them. Explain. |
| Answer» Solution :A SPECTRUM is the band of distinct colours we obtain when the white light is splitted by a prism. We can recombine the component of white light by passing them through a prism placed upside down near the given prism. When we pass white light through two identical prisms held side by side with their refracting EDGES in opposite directions, the first prism DISPERSES white light but the second prism RECOMBINES them. Thus light EMERGING from second prism is white. | |
| 6136. |
When an object is placed infront ofa spherical mirror at a distance 30 cm, the magnification is -1. Write down the properties of the image? |
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| 6137. |
Whatis meant by an artificial satellite?How arethe satellite classifiedbased on their functions ? |
Answer» Solution :Artificial satellites are man-made objects which revolve around the earth or any other PLANETS in a FIXED ORBIT. Depending on their FUNCTIONS, satellites are classified into following categories : 
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| 6138. |
We can see biodiversity on three levels. |
| Answer» Solution :(1) There is biodiversity in the LIVING organisms belonging to the same genus. (2) This DIVERSITY is due to different heredity pattern. This is called genetic biodiversity. (3) The organisms OCCUPYING thesame AREA and belonging to the same species also show diversity due to different species. This is species biodiversity. (4)The organisms occupying different ecosystems also show differences, WHICHIS called ecosystem biodiversity. Therefore, we observe biodiversity on three different levels. | |
| 6139. |
Which colour of light deviates the least in the spectrum obtained with a prism ? |
| Answer» SOLUTION :RED LIGHT | |
| 6140. |
In fast breeder the coolant system used is |
| Answer» Solution : liquid sodium | |
| 6141. |
An object kept at 60 cm from a lens gives a virtual image at 20 cm in front of the lens. What is the focal length of the lens ? It it a converging lens or diverging lens ? Also find the magnification produced. |
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Answer» Solution : ` 1/F = 1/v - 1/u = 1/ ( - 20 CM ) - 1/( - 60 cm)` ` = - (1/(20 cm) - 1/( 60 cm) ) = - ((3-1)/ ( 60 cm))= - 2/( 60 cm) = - 1/( 30 cm)` The focal length of the lnes, f = - 30 cm. As f is NEGATIVE , it is a diverging lens. |
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| 6142. |
Why a solar cooker is painted black from outside? |
| Answer» SOLUTION :Black surface absorbs more heat as compared to WHITE or reflecting surface under IDEAL CONDITIONS: | |
| 6143. |
Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B ? Give reason. |
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Answer» SOLUTION :Yes, a current is induced in the coil B. When the current in the coil A is changed, the MAGNETIC field associated with it also changes. As coil B is placed close to A, hence magnetic field LINES AROUND this coil also change. DUE to change in magnetic field lines associated with coil B, an induced current is also induced in it. |
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| 6144. |
"Derive"(1)/(R)=(1)/(R_(1))+(1)/(R_(2))+(1)/(R_(3)). |
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Answer» Solution :Parallel CONNECTION : In Parallel connection of resistors there is same potential difference at the ends of the resistors. Hence the voltage in the CIRCUIT is equal to V. Let `I_(1),I_(2)andI_(3)` be the currents flowing through `R_(1),R_(2)andR_(3)` resistors respectively. Hence, we can write `I=I_(1)+I_(2)+I_(3).` According to the Ohm's law. `V_(1)=1_(1)R_(1),V_(2)=I_(2)R_(2),V_(3)=I_(3)R_(3)` here,`V=V_(1)=V_(2)=V_(3)` `thereforeV=I_(1)R_(1),V=I_(2)R_(2),V=I_(3)R_(3)` `rArrI_(1)=(V)/(R_(1)),I_(2)=(V)/(R_(2))andI_(3)=(V)/(R_(3))` `thereforeI=I_(1)+I_(2)+L_(3)` `rArr(V)/(R_(eq))=(V)/(R_(1))+(V)/(R_(2))+(V)/(R_(3))` `rArrcancel(V)xx(1)/(R_(eq))=cancel(V)[(1)/(R_(1))+(1)/(R_(2))+(1)/(R_(3))]` `rArr(1)/(R_(eq))=(1)/(R_(1))+(1)/(R_(2))+(1)/(R_(3))(" here " R_(eq)" is the equivalent resistance ")` `therefore` The equivalent resistance of a parallel combination is LESS than the resistance of each of the resistors. 
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| 6146. |
A body needs a _________ to move , or bring to rest or changeits velocity . |
| Answer» SOLUTION :PUSH or PULL | |
| 6147. |
A man raises a box of mass 50 kg to a height of 2 m 10 s,while another man raises the same box to the same height in 50 s. (a)Compare :(i)the work done ,and (ii)the powerdeveloped by them . Take g=10 N kg^(-1) |
| Answer» SOLUTION :(a) (i)1:1 (ii)5:2 (B)(i)1000 J , 1000 J (ii)50 W ,20 W | |
| 6148. |
There are clusters of thick forests in the Western Ghats of India. |
| Answer» SOLUTION :(1) There are MANY sacred grovesin the region of WESTERN Ghats of INDIA. (2) These forests are not conserved by Government Forest Departments but are cared for by the local people, in the name of God. (3) Due to such faith in the people, the forests are conserved LIKE sanctuaries.(4) Such many clusters are in Western Ghats of Maharashtra. | |
| 6149. |
Which of the following is/are correct ? (i) Chain reaction takes place in a nuclear reactor and an atomic bomb. (ii) The chain reaction in a nuclear reactor is controlled. (iii) The chain reaction in a nuclear reactor is not controlled. (iv) No chain reaction takes place in an atom bomb. |
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Answer» (i) only CORRECT |
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| 6150. |
Which colour is scattered the most ? |
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Answer» BLUE |
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