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.
| 2501. |
Calcium oxide reacts vigorously with water to produce slaked lime.CaO" "(s) + H_2O" "(I)rarrCa(OH)_2" "(aq)This reaction can be classified as :(A) Combination reaction(B) Exothermic reaction(C) Endothermic reaction(D) Oxidation reaction |
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Answer» (A) and (C) |
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| 2502. |
A coil of insulated copper wire is connected to a galvanometer. What happens if a bar magnet is : (a) pushed into the coil ? (b) withdrawn from inside the coil ? (c) held stationary inside the coil ? Give reasons for your observation. |
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Answer» Solution :(a) When a bar magnet is pushed into the coil of insulated copper wire connected to a galvanometer, an INDUCED current is set-up in the coil due to change of magnetic field through it. As a result, galvanometer GIVES a deflection (SAY TOWARDS left). (b) When the bar magnet is WITHDRAWN from inside the coil, again an induced current is set up in the coil due to change of magnetic field through it. As a result galvanometer gives a deflection in the reverse direction. (say towards right). (c) If the bar magnet is held stationary inside the coil, then there is no induced current in the coil, because there is no change in magnetic field through it. As a result, galvanometer does not show any deflection. |
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| 2503. |
Which gas cannot be used as a fuel ? |
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Answer» C.N.G. |
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| 2504. |
Draw neat labelled diagrams : Type of lenses. |
Answer» SOLUTION :
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| 2505. |
The focal length of a convex lens is 20 cm . If an object of height 4 cm is placed at 30 cm from the lens , find the position, nature and size of the image . |
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Answer» SOLUTION :Data : Convex lens , `f=20` cm , `u=-30 cm , h_(1)=2 cm , v=? , h_(2) =? , M=?` `1/v =1/f + 1/u=1/(20 cm)+(1)/(-30CM)` `=(1)/(20 cm) -(1)/(30 cm)` `=(3-2)/(60 cm)=(1)/(60 cm)` `THEREFORE ` v=60 cm , v is positive. The image will be FORMED at 60 cm from the lens andon the other side of the lens with RESPECT to the object . It is a real image. |
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| 2506. |
__________ determines the direction of flow of heat. |
| Answer» SOLUTION :TEMPERATURE | |
| 2507. |
Theinduced electromotive force produced in a coil is proportional to rate of changeof ……… |
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Answer» |
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| 2508. |
The focal length of a convex lens is 20 cm . If an object of height 2 cm is placed at 30 cm from the lens , Find the magnification produced and height of the image |
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Answer» Solution :Data : Convex lens , `f=20` cm , `u=-30 cm , h_(1)=2 cm , V=? , h_(2) =? , M=?` `(h_(2))/(h_(1))=u/v` `therefore (h_(2))/(2 cm)=(60 cm)/(-30 cm) =-2` `therefore h_(2)=-2XX2 cm =-4cm` `h_(2)` is negative . This shows that the IMAGE is inverted . |
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| 2509. |
When ice is heated the temperature of ice remains constant till it melts completely. Justify this statement. |
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Answer» Solution :1.During transition of ice (solid phase) to water (liquid), ice absorbs HEAT ENERGY but its temperature does not increase 2.The temperature REMAINS constant, because the heat energy is UTILIZED for weakening the bonds between the atoms or molecules in the ice and transfonns it into water. |
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| 2510. |
The focal length of a convex lens is 20 cm . If an object of height 2 cm is placed at 30 cm from the lens , find the magnification produced by the lens . |
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Answer» Solution :DATA : Convex LENS , `f=20` CM , `u=-30 cm , h_(1)=2 cm , v=? , h_(2) =? , M=?` `M=(h_(2))/(h_(1))=(-4 cm)/(2 cm)=-2` M is negative , indicating that the IMAGE is inverted . The magnification produced by the lens =-2. |
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| 2511. |
What is solenoid? |
| Answer» Solution :Solenoid is a COIL of many turns of WIRE, WRAPPED in the SHAPE of a CYLINDER. | |
| 2512. |
Whosemagnetic fieldis likethe magnetic fieldor a bar magnet ? |
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Answer» A CURRENT- carryingwire |
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| 2513. |
No force acts on a current-carrying conductorwhen it is placed |
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Answer» PERPENDICULAR to the MAGNETIC FIELD |
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| 2514. |
When is linear magnification of a convex lens positive and when is it negative? What should be the corresponding distance of the object from convex lens of focal length 50 cm? |
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Answer» Solution :Linear magnification of a CONVEX lens, `m=("size of image" (h_(2)))/("size of object" (h_(1)))=(v)/(u)` Talking `h_(1)` as positive, magnification (m) will be positive, when `h_(2)` is positive, i.e., image is erect and VIRTUAL. This happens when object DISTANCE (u) from the lens is lessthan focal length `(f =50 cm)` of the convex lens. Again magnification (m) will be negative, when `h_(2)` is negative, i.e., image is inverted and real. This happens when object distance (u) from the lens is more than the focal length `(f =50 cm)` of the lens. |
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| 2515. |
Sacred Groves: |
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Answer» Solution :(1) Some GREEN forest patches were conserved in the NAME of GOD by the locals and tribal people. These are considered SACRED a,nd hence the name sacred GROVE. (2) These groves are 'sanctuaries' conserved by the society. (3) Sacred groves have special protection because they are conserved as God's abode. (4) Such patches of thick forests are mostly present in Western Ghats. (5) In India, more than 13000 sacred groves have been reported. |
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| 2516. |
On what is the natural method of animal classification based ? |
| Answer» Solution :Natural SYSTEM of CLASSIFICATION was based on following criteria such as body ORGANIZATION , types of cells , CHROMOSOMES ,BIO - chemical properties,etc. | |
| 2517. |
What is the function of receptors in our body ? Think of a situation where receptors do not work properly what problems are likely to arise. |
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Answer» Solution :Function of RECEPTORS : They sense the external stimuli such as heat or pain They also TRIGGER an IMPULSE in the sensory neuron which sends message to the spinal cord. When the receptors are damaged the external stimuli transferring signal to the brain are not felt. For example in the case of damaged receptors if we ACCIDENTALLY touch any hot objects we cannot FEEL the pain or heat. Receptors cannot procive the external stimuli of heat and pain |
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| 2518. |
Diseases endangering the social health |
| Answer» SOLUTION :(1 ) AIDS (2) Tuberculosis(3) LEPROSY | |
| 2519. |
A satellite does not require any fuel to orbit the earth. Why? |
| Answer» Solution :The gravitational FORCE between satellite and earth PROVIDES the NECESSARY CENTRIPETAL force for the satellite to orbit the earth. | |
| 2521. |
In a power plant based onnatural gas pressurised air is introduced into the combustion chamber using a generator. |
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| 2522. |
A light body and a heavy body have same linear momentum. Which one has a greater kinetic energy ? |
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Answer» <P> Solution :LIGHTER body has more K.E. as K.E. `=(p^(2))/(2M)` and for constant p K.E. `prop1/m`. |
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| 2523. |
Loud speaker, Microphone, Electric motor, Magnet |
| Answer» Solution :Magnet. It has magnetic FIELD, whereas other DEVICES USE magnetic field and electric field for their working. | |
| 2524. |
A galvanometer is used to indicate the ______________. |
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Answer» direction |
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| 2525. |
What is the function of an earth wire ? Why is it necessary to earth metallic appliances ? |
| Answer» Solution :The earth wire is connected as a safety measure with all electrical appliancesthathave a metallic body, e.g., microwave, electric press,toaster, geyser, cooler, AC, etc. Any leakage CURRENT to the metal body of the appliance is sent to the earth by the earth wire thereby PREVENTING the user from getting a SEVERE electric SHOCK. | |
| 2526. |
Differentiate between aerobic and anaerobic respiration |
Answer» SOLUTION :
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| 2527. |
Various phuysical problems like tiredness, headache, insomnia, forgetfulness, tinnitus, joint pains and problems in vision may arise due to ……….of cell phones. |
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| 2528. |
(a) Draw the magnetic lines of force dueto a circular wire carrying current. (b) What are the various ways in whichthe strength of magnetic field produced by a curren-carryingcircular coil can be increased ? |
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| 2529. |
State the importance of biofertilizer. |
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Answer» SOLUTION :(a)Obesity is due to genetic factors, physical INACTIVITY, overeating and endocrine factors. (b)(i)BIOFERTILIZERS are easy to produce in abundance and are available at LOW X cost to the marginal farmer. (ii)It increases the soil fertility without causing any damage to the soil. Eg: Rhizobium, AZOSPIRILLUM, Azotobacter |
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| 2530. |
Human life expectancy is of the order of |
| Answer» Answer :D | |
| 2531. |
Mayank's father never bothered to check the brand/contents of the salt he had purchased from the market. Mayank noticed that her sister had developed swollen neck. The doctor advised her to eat iodised salt. (i) Name the disease from which Mayank's sister suffered. (ii) Why has the doctor advised her to eat iodised salt? (iii) How will this incidence influence Mayank's attitude towards health? |
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Answer» SOLUTION :(i) Goitre/Thyroid RELATED disease. (ii) Iodine PRESENT in iodised salt is NEEDED to produce thyroxin hormone. (iii) Mayank would become more careful regarding health, will be conscious of his DIET and of people around him. |
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| 2532. |
Why do we prefer a convex mirror as a rear view mirror in vehicles? |
| Answer» Solution :Since convex mirror always produces ERECT and diminished image of an OBJECT, the field of view is increased and the DRIVER of the vehicle can seetraffic over a LARGE area behind his vehicle. | |
| 2533. |
Which one of the following stakeholders of forests causes the maximum damage to forest ? |
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Answer» People who live in or around the forest |
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| 2534. |
Resurgence, restoration, redemption, repetition. |
| Answer» Solution : REPETITION - Others are main ASPECTS of disaster management CYCLE. | |
| 2535. |
Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor? |
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Answer» Solution :Electric motor : A labelled diagram of an electric motor has been shown in Fig. 13.7. Principle: A current-carrying conductor, when placed in a magnetic field, experiences a FORCE. If the direction of the field and that of the current are mutually perpendicular then force acting on the conductor will be perpendicular to both and will be GIVEN BC by Fleming.s left-hand RULE. Due to this force the conductor begins to move, if it is free to do so. Working : Let current in the coil ABCD of motor enters from the source battery through the conducting brush X,flows along ABCD and finally flows back to the batterythrough brush Y.On applyingFleming.sleft- handrulewe find theforceactingon arm AB dueto magneticfieldpushesitdownwards. But theforceactingon arm CD pushes it upwards . Thus, the coilland theaxlerotate anticlockwise. Due to action of split ring commutator at half rotation split rings Pand change their contacts with brushes. Now, P makes contact with Y and Q with X. As a result, current begins to FLOW in coil along DCBA. As a result, now AB arm is being pushed upward and arm CD downward by the magnetic force. Consequently the coil rotates half a turn more in the same direction. This reversing of current direction is repeated at each half rotation and so the coil CONTINUES to rotate in the same direction. 
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| 2536. |
Draw the symbols of commonly used components in electrical circuit diagrams. |
Answer» SOLUTION :Symbols of some commonly USED components in CIRCUIT diagrams are given below: 
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| 2537. |
What is triple fusion ? |
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Answer» Solution :(i) Thyroid hormones is essential for normal physical, mental and personality DEVELOPMENT. Hence it is called as personality hormone. (ii) The fusion involving two polar nucleus and a sperm nucleus, that OCCURS in double fertilization in a seed plant and results in the FORMATION of endosperm, is called the triple fusion. (iii) Importance of forests. • Forests are the IMPORTANT component of our environment and are dominated by microorganisms, flowering plants, shrubs, climbers and dense trees. • Forests provide a vast habitat for wild animals. • Forests help for the ECONOMIC development of our country. • Forests are the source for a wide range of renewable natural resource, • Forests provide wood, food, fodder, fibre and medicine. • They act as carbon sink, regulate climatic conditions, increase rainfall and reduce global warming.• Forests protect wild life and also acts as catchment for water conservation. • They prevent natural hazards like floods and landslides • They play a vital role in maintaining the ecological balance. |
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| 2538. |
During cold nights, sometimes dew is formed. State true/false |
| Answer» SOLUTION :(1) During a cold night, the temperature of air MAY fall to the dew POINT, or EVEN below the dew point. (2) If the temperature falls below the dew point, the excess of water vapour in air CONDENSES on the surface of cold bodies and dew is formed. | |
| 2539. |
Give the magnitude and directions of the net force acting on a rain drop falling with a constant speed. |
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| 2540. |
Make a presentation on pollution of Ganga and Yamuna Rivers and effects of air pollution on Taj Mahal. |
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Answer» Solution :i. River Ganga and Yamuna are polluted due to various human activities like bathing, WASHING CLOTHES , dumping of various harmful industrial wastes, etc., near river bank. ii. Primary air pollutants like carbon containing particles and secondary pollutants like hazardous chemicals in ACID rains are CAUSING discoloration of TAJ Mahal. |
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| 2541. |
What are the structures involved in the protection of brain? |
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Answer» Solution :The braincontrolling centre of all the body activities is COVERED by three connective tissue membrane (or) meanings. (i) Delamater - is the outermost thick fibrous membrane. (ii) Arachnoid membrane - is the middle thin vascular membrane PROVIDING web - LIKE cushion. (iii) Piamater - is the innermost thin delicate membrane richly supplied with blood. Meningeal membranes protect the brain from MECHANICAL injury. |
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| 2542. |
When a beam of white light passes through a glass prism, it splits up into seven colours. This phenomenon is due to |
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Answer» REFRACTION of LIGHT. |
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| 2543. |
The normal human heart beat is about ............. .... time per minute. |
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Answer» 72-75 |
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| 2544. |
What are longitudinal waves? Give one example. |
| Answer» Solution :If the PARTICLES of the medium vibrate ALONG the direction of PROPAGATION of the WAVE. | |
| 2545. |
a) What will be the formula and electron dot structure of cyclopentane. b) How would you distinguish experimentally between an alcohol and carboxylic acid. |
Answer» Solution :Theformula for cyclopentane is `C_5 H_(10)` . Its electron dot structure is given below.  We can distinguish betwecn an alcohol and a carboxylic acid on the BASIS of their reaction with carbonate and HYDROGEN carbonates. Acids reacts with carbonate and hydrogen carbonate to evolve `CO_2` gas that TURMS lime water milky. Metal carbonate / metal hydrogen carbonate + carboxylic acid. `"" darr` Salt + water + carbondioxide . ALCOHOLS on the other hand, do not react with carbonates and HYDROGENCARBONATES. |
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| 2546. |
State the factors on which the magnitude of the magnetic field due to a current-carrying conductor depends and how it depends. |
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Answer» Solution :The magnetic field at a POINT DUE to a CURRENT-carrying conductor depends on the current through the conductor and the distance of the point from the conductor . (1) The magnitude of the magnetic field produced at a given point is directlyproportional to the magnitude of the current PASSING through the conductor . (2) The magnitude of the magnetic field produced by a given current in the conductor decreases as the distance from the conductor increases. |
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| 2547. |
A person got his eyes tested. The optician's prescription for the spectacles reads : Left eye : - 3.00 D "" Right eye : - 3.50 D The person is having a defect of vision called : |
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Answer» presbyopia |
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| 2548. |
If Gadolinium -150 undergoes through alpha-decay what is the new atomic mass of the resulting element ? |
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Answer» SOLUTION :`GA^(150) to X^(146)+""_(2)He^(4)` New atomic number -146 |
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| 2549. |
Effective weight of a solid of specific gravity one when immersed in water will be |
| Answer» SOLUTION :zero | |
| 2550. |
Explainthe underlying principle and working of an electric generator by drawing a labelled diagram . Whatis the function of brushes ? |
| Answer» SOLUTION :Out of SYLLABUS | |