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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.
| 601. |
What is Terrestrial Telescope ? |
| Answer» SOLUTION :Terrestrial telescope is used for viewing objects on the surface of the Earth as it PROVIDES an ERECT IMAGE. | |
| 602. |
Study of fossils is known as ....................... . |
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Answer» fossilization |
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| 603. |
A truck is loaded with 10^(3) kg of iron and another identical truck is loaded with 10^(3) kg of cotton. In case both the trucks are to go on the same rough road with the same speed, changes of overturning of |
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Answer» both the TRUCKS are same |
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| 604. |
In a school, there are seventy teachers and most of them have their personal vehicles. There are many teachers who come from the same place but everyone prefers coming by their personal vehicle. On the other hand, the students of the school either come by buses or by car pooling. Answer the following questions based on the situation given above. (i) Whose practice of commuting to school is nature friendly? Justify your answer. (ii) What values are heing promoted hy teachers and students? (iii) In what other ways can we become nature friendly? |
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Answer» Solution :(i) The students' way of commuting is nature friendly because they are saving fossil fuels, which are non-renewable sources of energy, by this practice and also reducing pollution. (II) The teachers are promoting negligence towards ENVIRONMENT, careless spending of resources. The students are promoting environmental CONCERN, sharing, helpfulness. (iii) By switching off the LIGHTS and fans when not in USE, turning off the engine of vehicles at red lights. |
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| 605. |
A mechanic can open a nut by applying a force of 150N while using a lever handle of length 40cm. How long a handle is required if he wants to open it by applying a force of only 50 N? |
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Answer» Solution :In the first case, F=150N r=40cm =0.4m The moment of FORCE needed to open the nut `=150N times 0.4N=60 Nm`…….(i) In the second case, F=50N If he uses the handle the length Lm, then Moment of force `=50N times L m =50 L N m`………(II) From EQNS. (i) and (ii) `50L=60` or `L=60/50=1.2 m` |
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| 606. |
Name is five layers of body wall of leech. |
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Answer» Solution :The BODYWALL of leech includes FIVE layers: (i) cuticle (ii) epidermis (iii) dermis (IV) muscular layer and (V) botryoidal tissue |
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| 607. |
A particle is moving eastwards with a velocity of5 m//s. In 10 s the velocity changes to 5 m//s nothwards. The average acceleration in this time is |
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Answer» Zero  ACC. `=(Delta nu)/(t)` `=(5sqrt(2))/(10)=(1)/(sqrt(2))m//s^(2)` `vecV_(1)=5m//s` (East) `vecV_(2)=5m//s` (North) CHANGE in velocity `=vecV_(t)-vecV_(i)` `=5hatj-5hati m//s` `Delta nu=` Magnitude of change is velocity `=sqrt((5)^(2)+(5)^(2))=5sqrt(2) m//s` |
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| 608. |
What is the turning effect of force called for ? On what factors does it depend ? |
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Answer» Solution :Torque Factors (i) MAGNITUDE of FORCE. (II) Perpendicular DISTANCE of force vector from axis of ROTATION. |
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| 610. |
How much current will an electric heater coil draw from 220 V source, if the resistance of heater coil is 110 Omega. |
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Answer» Solution :GIVEN, `V = 220 V, R = 110 Omega, I = ?` `I=V/R=220/110=2A` |
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| 611. |
A piece of wood floats in water. What happens to it in a alcohol? |
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Answer» FLOATS higher |
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| 612. |
Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increase and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. How many times the sea level at the coast change? |
| Answer» SOLUTION :SEALEVEL at the coast increases and decreases TWO times a day. Two high TIDES and two LOW tides. | |
| 613. |
What is the minimum wind velocity required for obtaining useful energy with a windmill ? |
| Answer» SOLUTION :MINIMUM velocity REQUIRED for obtaining useful energy with a WINDMILL is about 15 km/h. | |
| 614. |
Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increases and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. How does sea level changed? |
| Answer» Solution :The sea-level at the coastal REGION GETS CHANGED TWO times a DAY due to gravitational attraction of the moon. | |
| 615. |
InWhichof the followingcases will the electriccurrent inducedin the loopbe maximum ? |
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Answer» The magneticfieldlinkedwith the loopchanges rapidly . |
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| 616. |
Read the paragraph and answer the following question: You must be knowing about the high and low tides that occur regularly in the sea. The level of the sea water at any given location along sea shore increases and decreases twice a day at regular intervals. High and low tides occur at different times at places. The level of water in sea changes because of the gravitational force exerted by the moon. Water directly under the moon gets pulled towards the moon and the level of water there goes up causing high tide at that place. At two places on the earth at 90^(@) from the place of high tide, the level of water is minimum and low tides occur there. Where is high tide and low tide caused? |
| Answer» Solution :DUE to gravitational attraction of the Moon, the water MASS swells towards the DIRECTION of the Moon CAUSING high -tide. The water mass shrinks at `90^(@)` from this PLACE which causes low tide. | |
| 617. |
How will be your pre- and post -disaster manangement in case you fasce any of those disasters? |
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Answer» Solution :PICTURE a shows gas leak from a LPG cylinder. i. Pre-disaster management: a. The gas cylinder and the rubber tubes used must be certified. b. Gas cylinders must be properly checked for leakage from pipe nozzle or any other part while installing. ii. Post-disaster management: a. Do not try to torn ON ro turn OFF any electrical appliances in the surrounding area. b.Put out all flames, incense sticks, etc. c. Turn off the LPG regulator and immediately put on the safety cap. d. Open all the windows and doors to ensure VENTILATION. e. Get in touch with the LPG cylinder dealer immediately. Picture b shows a FIGHT between shcool boys in playground. i. Pre-disaster management: a.Rules should be set while playing any sport in school playground so as to avoid arguments. b. A sports leader or monitor must be appoijnted tolook over the games and to ensure that the students follow the rules and are well behaved. c.Also, there must be an umpire to calculate the score. The decisions of the umpire will be binding upon all those who are playing. This will avoid debates or arguments. ii. Post -disaster management: a. In case of a dispute or argument arising during playing, the sports leader or the monitor must immediately intervene and try to resolve the argument. b. If the matter becomes serious, it must be brought to the notice of the school authorities. Picture c shows heavy rains and floods. i. Pree-disaster management: a. Keep supplies such as flashlight, and extra batteries, cangles, first aid kit, emergency dry food items, drinking water, essential medicines, etc. ready. b. Evacuate low lying areas where the chances of water logging are more. ii. Post -disaster management: a. Try to MOVE to elevated areas which are not flooded. b. Help in rescue operations and try to get people caught in flood to a safer place. c. Keep listening to the warnings and updates given by the authorities. Picture d. shows a CYCLONE. i. Pre-disaster management: a. If residing in cyclone prone areas or near sea coasts, keep suplies such as flashlight and extra batteries, candles, first aid kit, emergency dry food items, drinking water, essential medicines, cash, etc., ready. b. In case of getting notice from the authorities and if living on the coast, or on a flood plain, near a river, etc., evacuate immediately. c. Ensure that teh trees and shrubs around your home or building are well trimmed. d. In villages and rural places, it should be ensured that the roof is secured properly to the frame or the house structure. e. Listen to the radio or TV forinformation and turn off utilities if instructed to do so. ii. Post disaster management: a. Stay indoors and away from windows and glass doors. b.Close all interior doors. Secure and brace external doors. |
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| 618. |
The ··········· temperature is decided by the amount of vapour in the air. |
| Answer» SOLUTION :DEW POINT | |
| 619. |
Why are convex mirrors preferred over plane mirrors as rear view mirrors? |
| Answer» Solution :The field of view of convex MIRROR is wider in comparison to PLANE mirror. The convex mirror is PREFERRED as a rear view mirror as it ENABLES the direver to view much larger area than with a plane mirror. | |
| 620. |
Explain how the energy of following water is related to solar energy. |
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Answer» Solution :When solar energy falls on the WATER SURFACE then evaporation of water from water surface like oceans , rivers and otherwater bodies takes place to from clouds. The clouds are them taken to distant places by air currents , and ultimately water COMES back to the surface in the from of rain and snow. During evaporation, a part of solar energy GETS converted into potential energy of water molecules. The potential energy of water molecules gets converted into kinetic energy during rain and snowfall. THUS. energy of water following in a river is considered to be an indirect from of solar energy . |
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| 621. |
The sky appears blue because |
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Answer» RED LIGHT is absorbed |
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| 622. |
Mention the main purpose of using a plane mirror in solar cookers. |
| Answer» Solution :Mirror in a solar COOKER acts as a reflector of SUNLIGHT into the box. It INCREASES the CONCENTRATION of HEAT rays in the box. | |
| 623. |
Discuss the alpha decay process with example. |
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Answer» Solution :A nuclear REACTION in which an unstable parent nucleus EMITS an alpha PARTICLE and forms stable daughter nucleus, is called .alpha decay.. Eg, Decay of uranium (`U^(238)`) to thorium (`Th^(234)`) with the emission of an alpha particle. `""_(92)U^(238) to ""_(90)Th^(234)+ ""_(2)He^(4)(alpha "decay")` |
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| 624. |
What would be the acceleration due to gravity at another planet, whose mass and radius core twice that of earth ? |
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Answer» g `therefore (g_(1))/(g_(2))=(((GM)/(R^(2))))/(((G.2M)/(4R^(2))))` `(g_(1))/(g_(2))=2 RARR g_(2)=(1)/(2)g_(1)` |
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| 625. |
Who gave the principleof electromagneticinduction ? |
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Answer» Faraday |
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| 626. |
The image formed by a spherical mirror is real inverted and is of magnification -2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formedif the object is moved 10 cm towards the mirror. |
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Answer» Solution :`m=-2` `v=-30cm` `u=?` `m=-v/u` `+2=(+(-30))/u` `u=(-30)/2u=-15cm`. The object distance is 15 cm MIRROR FORMULA `=1/v+1/u=1/f` `(-1)/30(-1)/15=(-15-30)/450=15/450=1/f` f=-10cm The focal length is 10 cm. If the object is moved 10 cm TOWARDS the mirror the image will be the NATURE virtual and erect and the singe will be enlarged. |
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| 627. |
A uniform metre rule of mass 100g is balanced on a fulcrum at mark 40cm by suspending an unknown mass m at the mark 20cm. (i) Find the value of m. (ii) To which side the rule will tilt if the mass m is moved to the mark 10cm? (iii) What is the resultant moment now? (iv) How can it be balanced by another mass of 50 g? |
| Answer» SOLUTION :(i) m=50g (ii) on the side of MASS m, (iii) `500gf TIMES cm` (anticlockwise)(iv) by SUSPENDING the mass 50g at the mark 50cm. | |
| 628. |
In human beings the fertilisationoccurs in the |
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Answer» Uterus |
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| 630. |
Covalent compounds are generally poor conductors of electricity. Why ? |
| Answer» SOLUTION :There are no IONS in COVALENT COMPOUNDS. | |
| 631. |
The gravitational intensity in Q 93 is denoted by |
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Answer» g |
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| 632. |
Mukesh returns home from the hostel during vacation. He notices that members of his family are very carefree about use of electric energy at home and often leave the lights, fan or the refrigerator on, even when not required. He talks to his family members at the dinner table and requests them to be more careful about use of electrical energy and the impact of excessive use of this energy on environment. Answer the following questions based on the above information: (i) Write two adverse effects of wastage of electrical energy on environment. (ii) Which two values are reflected in Mukesh's thoughts and actions. (iii) Mention one more action which Mukesh may take to convey his message of avoiding wastage of electrical energy to members of society. |
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Answer» Solution :(i) (a) Use of coal or NUCLEAR fuel to generate ELECTRICITY and resulting environmental pollution. (b) Emission of harmful gases by air-conditioners, a refrigerators and its harmful EFFECT on environment. (ii) (a) Common good/avoidance of wastage of energy. (b) Environmental CARE. (iii) Comparison of monthly bills for ELECTRICAL energy consumption and creating awareness about minimising the same. Thus saving energy as well as the environmental protection. |
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| 633. |
A neuron contains all cell organelles except_____ |
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Answer» nucleus |
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| 634. |
In the following graph (Fig. 2.4) of displacement versus time, |
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Answer» the BODY is at rest |
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| 635. |
Short circuit occurs when live wire and earth wire come in direct contact |
| Answer» Solution :False. Reason : Short circuit OCCURS when live WIRE and neutral wire come in DIRECT CONTACT. | |
| 636. |
The colour of iodine disappears in the reaction between vegetable oil and iodine. |
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Answer» Solution :(1) Vegetable oils (unsaturated compound) contains a MULTIPLE BOND as their functional group. They undergo addition REACTION to form a saturated compound as the product. (2) The addition reaction of vegetable oil with iodine takes place INSTANTANEOUSLY at room temperature. The colour of iodine disappears in this reaction. This iodine test INDICATES the presence of a multiple 1 bond in vegetable oil. |
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| 637. |
Draw the ray diagram showing the image formation by a convex lens, when the object is kept between principal focus and optic centre. With the help of the diagram mention the nature of the image formed. |
Answer» SOLUTION : The NATURE of the IMAGE is VIRTUAL and ERECT |
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| 638. |
If field lines of a magnetic field are crossed at a point, what does it indicate ? |
| Answer» Solution :It WOULD mean that at the point of intersection, COMPASS NEEDLE would point to two directions which is impossible. | |
| 639. |
Environment is formed of : |
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Answer» only biotic component |
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| 640. |
Calculate the ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm. |
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Answer» SOLUTION :GIVEN: effort ARM=60 cm, load arm=4cm. IDEAL mechanical advantage `=("effort arm")/("load arm")=(60)/(4)=15`. |
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| 641. |
What is electrical resistivity? What is SI unit? |
| Answer» SOLUTION :The ELECTRICAL resistivity of a material is the resistance offered byunit cube of that material betaween its opposite FACES. Its SI UNIT is ohm-metre `(Omega-m)`. | |
| 642. |
How do the iris and pupil respond to (i) dim and (ii) bright light ? |
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Answer» SOLUTION :(i) When the LIGHT is dim, the iris EXPANDS the pupil to ALLOW more light into the EYE. (ii) When the light is bright, the iris contracts the pupil to llow less light into the eye. |
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| 643. |
The distances meansured against the direction of incidentlight are taken as negative . |
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Answer» |
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| 644. |
Assertion : The air buble shines in water. Reason : Air bubble in water shines due to refraction of light. |
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Answer» Both assertion and reason are true and reason is CORRECT EXPLANATION of assertion. |
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| 645. |
Which of the following is not a consequence of establishing hydroelectric power plants ? |
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Answer» displacement of PEOPLE |
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| 646. |
In case of a concave mirrors, an erect image is ________ |
| Answer» SOLUTION :VIRTUAL and ENLARGED | |
| 647. |
Mr. Dogra lives in a very old house. The electric wiring in this house was done more than 50 years ago. Mr. Dogra purchased an air conditioner recently. One day Mr. Dogra was sitting in a closed room with all his family members with air conditioner switched on. A geyser was also working on the same socket as the air conditioner. Suddenly, everyone in the room heard a little explosion and saw that the electric wires in the air conditioner socket had caught fire. Mr. Dogra was so shocked that he did not know what to do. Mr. Dogra's son Rajesh who is studying in Class X rushed out of the room and put off the main switch quickly. Before Mr. Dogra could call the Fire Brigade, Rajesh extinguished the fire with the help of a fire extinguisher which he had made in the school. An electrician was called. When he checked the main fuse, he found that someone had put a thick copper wire in the main fuse instead of proper fuse wire. The electrician changed the whole wiring of the house by using good quality wires and fixed a proper fuse wire in the main fuse. He also made separate circuit for geyser and provided separate fuses for all the circuits. (a) Why did the electric wires catch fire ? (b) What is the condition of using an air conditioner and a geyser on the same socket known as ? (c) Why did the fuse not blow off ? (d) What would you recommend in place of old porcelain fuse holders in the house to project the wiring more efficiently ? (e) What values are displayed by Mr. Dogra's son Rajesh in this whole episode ? |
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Answer» Solution :(a) The wires caught fire due to overheating caused by the excessive current passing through then when two appliances, AIR conditioner and geyser, which draw heavy current were used on the same socket. (b) This condition is CALLED overloading. (c) The fuse did not blow off because a THICK copper wire had been used as a fuse wire in the fuse box which did not get heated too much, did not melt and hence did not break to cut off the electric supply. (d) The old porcelain fuse holders should be replaced by MCBs (Miniature Circuit Breakers). And an additional MCB should be put inthe air conditioner circuit alongwith its socket. (e) The values DISPLAYED by MR. Dogra's son Rajesh are (i) Presence of mind (in switching off the main switch to cut off electricity supply and prevent fire from spreading), and (ii) Concern for the family (to protect them by extinguishing the fire). |
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| 648. |
Name one medical technique which is based on magnetism produced in human body. For what purpose is this technique used ? |
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Answer» |
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| 649. |
Name the form of energy which a wound up watch spring possesses. |
| Answer» SOLUTION :ELASTIC POTENTIAL ENERGY | |
| 650. |
Urochordata and Cephalochordata . |
Answer» SOLUTION :
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