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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.
| 7551. |
Why are the coils of electric toasters and electric irons made of an alloy rather than a pure metal? |
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Answer» SOLUTION :Coils of electric toasters and electric IRONS are made of an ALLOY DUE to the following two reasons: (i) Resistivity of an alloy is generally higher than that of pure metals, hence for a given resistance we need a coil of LESSER length. (ii) At high temperature, an alloy does not oxidise readily. Hence, coil of an alloy has longer life. |
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| 7552. |
The appliancewith the help of whichelectricitycan be generated is known as …….. . |
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| 7553. |
A doctor prescribes a corrective lens of power -0.5 D to a person. Find the focal length of the lens. Is this lens diverging or converging? Give reason. How does the property of this lens can be used to correct eye defects ? |
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Answer» SOLUTION :(i) He is suffering from myopia because the focal length required for the lens is negative. (ii) GIVEN P = -1.2 D. `F = (1)/(p_(1))` [where, P = power of lens and f = focal length] `= (1)/(-1.2) = -0.83 m`. (iii) The lens is diverging because power is negative.  Or Given, Power (P) = = -0.5 D, Focal length (f) = ? `p = (1)/(f)rArr f = (1)/(P) rArr f = -(1)/(0.5) = 2m`. * This lens is diverging. * Because power of a lens is negative means the given lens is concave. * The diverging property of the lens is used to correct myopia. In myopic eye the image of a distant object is formed in front of the retina and not on the retina. * A concave lens of SUITABLE power diverges the light rays and brings the image back on the retina. |
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| 7554. |
The electronic configuration of an element 'X' is 2,8,8,2. Write its (i) group number, (ii) period number and (iii) the number of valence electrons in its atom. Justify your answer in each case. |
| Answer» Solution :`X =2,8,8,2 RARR ` (i) GROUP number `=2^(nd)` , (ii) Period number =4 , (iii) VALENCE electrons =2 | |
| 7555. |
A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram. Trace it one your answer sheet and show the path of the emergent beam as observed on the screen DE. (i) Write the name and cause of the phenomenon observed. (ii) Where else is nature is the phenomenon observed ? (iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light. |
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Answer» Solution :(i) The phenomenon observed is DISPERSION of light which MEANS splitting of white light into its constituent colours. It is caused because different constituent colours of light travel with different speeds in the prism and bend through different angles. (II) In nature, this pehnomenon is observed in formation of rainbow. (iii) Based on phenomenon of dispersion, we can conclude that : (a) White light consists of seven colours. (b) Violet light SUFFERS maximum deviation and red light suffers MINIMUM deviation. 
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| 7556. |
In figure, PQ and PR are the two light rays emerging from an object P. the ray PQ is refracted as QS. (a) state the special name given to the angle of incidence anglePQN for the ray PQ. (b) What is the angle of refraction for the refracted ray QS? (c) Name the phenomenono that occurs if the angle of incidence anglePQN is increased. (d) The ray PR suffers partial reflection and refraction on the water-air surface. give reason. (e) Draw in the diagram the refracted ray for the incident ray PR and hence show the position of the image of the object P by the letter P' when seen vertically from above. |
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Answer» (b) `90^(@)` (C) Total internal REFLECTION (d) For the RAY PR, angle of incidence is LESS than `angle PQN` (i.e., the critical angle). |
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| 7557. |
A charge of 10 coulomb flows through a bulb in 5 second. What is the current through the bulb ? |
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Answer» SOLUTION :Given `Q = 10 C` t = 5S` `I = Q/t = 10/5` `I = 2A`. |
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| 7558. |
Answer the following questions . (b) Prepare a slogan for compaign against female foeticide . |
| Answer» Solution :(1) SAVE the girl child . (2) DAUGHTERS GIVE LOT of joy , it is not only the BOY . | |
| 7559. |
What will you do if you see a person coming in contact with a live wire? |
| Answer» Solution :Such a person should be provided with an INSULATED support like WOOD, plastic or rubber in ORDER to disconnect the person from WIRE. | |
| 7560. |
Which are the objectives of disaster management? OR State any four objectives of disaster management. |
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Answer» Solution :The objectives of DISASTER management are as follows: i. To reduce the loss of HUMAN life caused during the disaster and to rescue people from those disasters. To reduce the EFFECT of disaster by supplying essential commodities to people. iii. To restore the human life in the region and bring normalcy in life of people affected by disaster. iv. To REHABILITATE the people affected by disaster. v. To take precautionary steps so as to reduce the effect of SIMILAR disasters in future. |
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| 7561. |
A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 5 g are put one on top of the other at the 12.0 cm mark, the stick is found to be balanced at 45.0 cm, what is the mass of the meter stick ? |
| Answer» SOLUTION :m= 66.0 GM. | |
| 7562. |
Vaccine is |
| Answer» Solution :The 'antigen' containing material given to a PERSON or animal to ACQUIRE EITHER permanent or TEMPORARY immunity against a specific PATHOGEN or disease is called a vaccine. | |
| 7563. |
The electric bulb consists of the filament whose melting point is low. |
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Answer» Solution :FALSE. The ELECTRIC BULB CONSISTS of the filament whose melting POINT is high. |
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| 7564. |
In a pea plant, the trait of flowers bearing purple colour (PP) is dominant over white colour (PP). Explain the inheritancepattern of F1 and F2 generations with the help of a cross following the rules of inheritance of traits. State the visible characters of F1 and F2 progenies. |
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Answer» Solution :Given that : PURPLE is dominant over white  Visible CHARACTERS in F1 are all purple flowers BEARING plants and in F2 for every 3 purple flowers bearing plants and there is only 1 white flower bearing PLANT. |
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| 7565. |
Assertion:The process of transferring heat energy from lower temperature to higher temperature is called cooling. Reason: The mass of the system is not altered when it is cooled. |
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Answer» both the ASSERTION and the reason are trueand the reason is the CORRECT EXPLANATION of the assertion. |
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| 7566. |
Child of your neighbour is addicted to tobacco chewing |
| Answer» Solution :The hazards of tobacco CHEWING will be explained to this CHILD. Different PHOTOGRAPHS and videos showing the conditions of oral cancer will be shown to this child to persuade him, so that he can STAY away from tobacco.This addiction has to be removed, so help of this parents will be TAKEN, They will be told about the child's habit and asked to help him free his addiction. | |
| 7567. |
Name the three types of wirea used in household drcuits. Out of these three which wire ls used as a safety measure especially for those appliances that have metallic body. State the colour of insulation used for this wire . How it ensures the safety of the user ? |
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Answer» SOLUTION :(i) Live WIRE (ii) Neutral wire (iii) Earth wire Earth wire, colour of insulation - green The metallic BODY CONNECTED to the earth wire KEEPS its potential to that of the earth.s zeropotential and if there is any leakage , the user does not get any kind of electric shock. |
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| 7568. |
State Fleming's left hand rule or motor rule. |
| Answer» SOLUTION :ACCORDING to Fleming.sleft-hand rule, if we stretch the forefinger, the centralfinger, and thumb of our left handmutuallyperpendicular to each other and if the forefingerpoints in the direction of the MAGNETIC field, the central FINGER in the directionof current,then the thumb pointsin the direction of motion ofthe conductoror THEFORCE on the conductor. | |
| 7569. |
You are spending more time in internet mobile games.phone etc. |
| Answer» Solution :In life the time once spent never RETURNS back. We therefore must use our time for studies exercise or outdoor games and some entertainment. In the free time ,we must also help our parents in house hold. Work. But if we are spending hours together on surfing the net without any perfect-aim or playing the computer or cell phone games it is total waste of time, There are MANY inappropriate siteson the internet, which should not be watched. This causes stress. Continuous use of mobile phone and being hooked to the SOCIAL media slowly becomes an addiction.If these bad habits are creeping in us we must try to LEAVE the habits by CONSCIOUS change. | |
| 7570. |
The lever for which mechanical advantage is less than 1 has: |
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Answer» FULCRUM at the mid POINT between LOAD and effort. |
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| 7571. |
The molecularformula of an open chain organic compound isC_3H_6. The class of the compound is |
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Answer» alkane |
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| 7572. |
An object 2.0 cm high is placed 20.0 cm in front of a concave mirror of focal length 10.0 cm. Find the distance from the mirror at which a screen should be placed in order to obtain a sharp image. What will be the size and nature of the image formed ? |
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Answer» Solution :Here h = 2.0 cm, U = - 20.0 cm and f = - 10.0 cm. `therefore""(1)/(v) = (1)/(f) - (1)/(u) = (1)/((-10)) - (1)/((-20)) = (-1)/(10) + (1)/(20) = - (1)/(20) rArr v = - 20` cm Again `(h.)/(h) = - (v)/(u) rArr h. = - (v)/(u) h = - ((-20))/((-20)) xx 2.0 = - 2.0` cm Hence, an image of LENGTH 2.0 cm is formed in front of mirror at a distance of 20 cm. The -ve sign of v and h. show that the image is REAL and inverted image. |
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| 7573. |
The radiation exposure of gamma-ray is measured by Rutherford. |
| Answer» Solution :The radiation EXPOSURE of `GAMMA`-ray is MEASURED by Roentgen. | |
| 7574. |
An electric oven of 2 kW power rating is operated in a domestic electric circuit [220V] that has a current rating of 5 A. What result do you expect ? Explain. |
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Answer» SOLUTION : Given : Power of the oven = 2 kW = 2000W, Voltage = 220 V. Using P = VI , L = `(P)/(V) = (2000)/(220) = 9 . 09 A` This exceeds the specified current rating of the oven which is 5A . Hence electric fuse meltsand breaks the circuit. |
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| 7575. |
1 curic is equal to ….. |
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Answer» the RADIOACTIVITY of 1 gram of URANIUM |
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| 7576. |
A student did an experiment with a convex lens. He put an object at different distances 25 cm, 30cm, 40cm, 60cm and 120 cm from the lens. In each case he measured the distance of the image from the lens. His results were 100 cm, 24cm, 60cm, 30cm and 40 cm, respectively. Unfortunately his results are written in wrong order. a) Rewrite the image distancees in the correct order. b) What would be the image distance if the object distance was 90 cm? c) Which of the object distances gives the biggest image? d) What is the focal length of this lens? |
| Answer» SOLUTION :a) 100 cm, 60 cm, 40 cm , 40CM, 24 cm b) 25.7 cm c) 25 cm d) 20 cm | |
| 7577. |
Water is used as a coolant because of its |
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Answer» lower density |
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| 7578. |
You are given a strong bar magnet and a magnet compass needle. Describe an activity by which the magnetic field lines due to the bar magnet can be drawn. |
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Answer» Solution : (i) Place the bar magnet on a sheet of white paper fixed on a drawing board. MARK the boundary of the magnet. (ii) Place the magnetic compass near the north pole of the given magnet. (ill) Mark the position of TWO ends of the needle. Now move the needle to a new. position such that its south pole occupies the position previously occupied by its north pole. (IV) In this WAY proceed step by step till you reach the south pole of the given magnet.  (v)Join the points MARKED on the paper by a smooth curve. This curve represents a FIELD Line. Repeat the above steps for new positions of compass needle . |
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| 7579. |
A student was asked to take 10 ml of rainwater in test tube A and l g of calcium sulphateadded to 10 ml of distilled both the test tubes B. He added couple of drops of soap solution to both A and B. After shaking both the test tubes equal number of times, whatdid the student observe ? |
| Answer» Solution :The student OBSERVED that the length of the foam produced is maximumin A This is because CALCIUM sulphate ADDED to TEST tube B makeswater hard and thus produces less foam | |
| 7580. |
series: high resistance : parallel : ___________ |
| Answer» SOLUTION :LESS RESISTANCE | |
| 7581. |
Survivalof aquatic life . |
Answer» SOLUTION :
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| 7582. |
How can it be shown that a magnetic field exists around a wire through which a direct current is passing? |
| Answer» Solution :If a MAGNETIC COMPASS needle is placed near the wire, the needle DEFLECTS INDICATING the PRESENCE of a magnetic field. | |
| 7584. |
A brinjal vendorsellshis brinjal using a beam balancein an elevator . Will he gain more if the elevator is accelerating up ? |
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Answer» SOLUTION :YES , Apparent WEIGHT =m(g+a). Apparentweightincreasesin ELEVATOR whileaccelerating upward . |
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| 7585. |
In Figure, draw a tackle to lift the load by applying the force in downward direction. (a) Mark in the diagram the direction of load L and effort E. (b) If the load is raised by 1 m, through what distance will the effot move ? (c) State the number of strands of tackle supporting the load. (d) What is the mechanical advantage of the system? |
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Answer» |
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| 7586. |
The device used for producing electric current is called a |
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Answer» GENERATOR |
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| 7587. |
How is the direction of magnetic field at a point determined? |
| Answer» Solution :The direction of the magnetic FIELD at a point can be found by placing a small magnetic COMPASS at that point. The north end of the needle of a compass INDICATES the direction of magnetic field at a point where it is placed. | |
| 7588. |
A driver is driving his car along a road as shown inFig. 2.3. The driver makes sure that the speedometer reads exactly 40km/h. What happens to the speed of the car from P to Q? |
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Answer» SPEED remains constant |
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| 7589. |
True / False type questions : It is necessary that the work done in the motion of a body over a closed loop is zero for every force in nature. |
| Answer» SOLUTION :No W.D.is ZERO only in CASE of a CONSERVATIVE FORCE. | |
| 7590. |
If the height of a satellite completing one revolution around the earth in T seconds is h_1 meter, then what would be the height of a satellite taking 2 sqrt2T seconds for one revolution? |
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Answer» Solution :1ST CASE `T_1`=T and `r_1 = h_1` 2nd case `T_2 =2sqrt2T`and `r_2=h_2`=? `T^2 PROP r^3` `T^2 = kr^3 ` (1st case) `T_1^2 = kr_1^3` `T_1^2 = kh_1^3` …(i) `T_2^2=Kr_2^3` (2nd case ) `[2sqrt2T]^2 = kh_2^3` `8T^2 = kh_2^2` `8kh_1^3 = kh_2^2`...(i) `8h_1^3 = h_2^3` `h_2=2h_1` |
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| 7591. |
(i) What is meant by least distance of distinct vision? (ii) How does the thickness of the eye lens change when we shift looking from a distant tree to reading a book? |
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Answer» SOLUTION :(i) It is the minimum distance to which, NORMAL eye can see TWO SIMILAR objects distinctly. (ii) Eye lens is comparatively thicker, while READING a book. |
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| 7592. |
Purity of milk can bedetermined by using |
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Answer» Barometer |
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| 7593. |
The phase of disaster management in which maximum lives can be saved by quick action after disaster. |
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Answer» |
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| 7595. |
Phenomenon behind formation of rainbow. |
| Answer» SOLUTION :DISPERSION, TOTAL internal REFLECTION and refraction | |
| 7596. |
State Fleming's left-hand rule. |
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Answer» Solution :Fleming.s left HAND rule gives the DIRECTION of theforce experiencedby a straightcurrent carrying conductorplaced in a magnetic field . According to this rule, if the thumb, fore-finger and middle finger of the left hand are stretchedto beperpendicularto each other as shownin the FIGURE, and ifthe fore finger represents the direction of magneticfield, THEMIDDLE finger represents the direction of current, then the thumb represents the direction of force . Fleming.sleft hand rule is applicable for MOTORS. |
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| 7597. |
Explain the statement - 'We have got this Earth planet on lease from our future generations and not as an ancestral property from our ancestors.' |
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Answer» Solution :We understand the concept of sustainable development from this statement. (1) The earth was inhabited by older generations before us. We have replaced them. (2) But during their life time, they have created hazardous IMPACT on the earth. The industrialization, the quest for more and more natural resources, wars fought, the construction activities such as dams, roads and bridges, extensive deforestation, etc. were their thoughtless activities. (3) All these activities were for development of mankind. But most of them have destroyed the delicate balance between the producers and different levels of consumers. (4) Due to ever increasing population of human beings there is shortage of food, clothing and shelter. To procure these basic needs, we have exploited many natural resources causing destruction of the earth's natural ecosystem. (5) Now it is our turn to protect the earth as on the same PLANET the next generations have to survive. We have to hand over the ecosystems of the earth which are in perfect balance to the new generations. (6) The future generations need a good quality of air, water and land along with all other living organisms. (7) Due to problems LIKE climate change, global warming, pollution, droughts, etc. the environment is IMPACTED, thus in order to keep sustainability of earth, we have to REMEMBER that the earth has not been obtained only as ancestral property but we have to save it for future generations. |
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| 7598. |
If there is flow of thermal energy between the systems, then they are in _____________. |
| Answer» SOLUTION :THERMAL EQUILIBRIUM | |
| 7599. |
Name two constituents of biogas, one of them should be chief constituent. |
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Answer» Solution :(i) METHANE-`75%` (ii) `CO_(2)` |
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| 7600. |
The direction of the currentin the coil of an electricmotorchanges per……..rotation . |
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Answer» two |
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