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.
| 501. |
Friction can be resuced by providing wheels .Explain the statement with an example . |
| Answer» SOLUTION :For example, a suitcase, when dragged on floor will experience a large amount of FRICTION but If WHEELS are provided to it, a very small amount of force is required to move it, because force of fric- TION decreases. | |
| 502. |
……………is the ability of an organism to move from one place to another. |
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| 503. |
Mohan is a student of class 6 . One day , his science teacher taught him electricity . After that, he had many doubts about the electical appliances and measuring devices that are used in his home . He observed that a wire from an electric pole is connected to a joule meter. A , fixed to the walll in the veranda, and from there to a main switch , and then to the main fuse, a refrigerator,a fan and a bulb are connected in parallel. Find out the appliance that consumes the least electric power among them. |
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Answer» BULB HENCE, the CORRECT OPTION is (a) |
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| 504. |
(a) Mention the substance used in white washing.(b)State the reason for using this substance for the above purpose. |
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Answer» Solution :(a) The SUBSTANCE used for white WASHING is calcium hydroxide. (b)Carbon dioxide PRESENT in air reacts with calcium hydroxide to form a white insolubel solid MASS of calcium carbonate. |
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| 505. |
Find the closed part of circuit in the following circuits. |
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| 506. |
Why are tall chimneys recommended for factories? |
| Answer» SOLUTION :TALL CHIMNEYS facilitate the release of smoke at higher altitudes so that LIVING beings on the earth 's surface do not get AFFECTED much. | |
| 507. |
Anil has a two-wheeler that weighs 120 kg. After completing his work, he used to park his vehicle in the regular parking place which is in connected to the ground with a ramp of inclination 45^(@). If the length of ramp is 1 m, then calculate the work done by Anil to park the vehicle anginst gravity. ((g=10ms^(-2)) |
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Answer» 10500 J Since inclination is `45^(@),AB=BC` THEREFORE, `AC^(2)=2AB^(2)` `impliesAB=sqrt""(10000//2)` The WORK DONE by ANIL to park the vehicle against gravity `=mgh=mgxxAB""("since "h=AB)`  `=120xx10xx0.7` `=1,050J` Hence, the correct option is (c). |
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| 508. |
Moon appearsbright at night. Is it a luminous or non-luminous body ? |
| Answer» SOLUTION :Moon is a non-luminous BODY, it does not emit its own LIGHT. It REFLECTS the sun light that falls on it. | |
| 509. |
What are the factors on which both gravitational potential energy and elastic potential energy depend ? |
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| 510. |
Explain the role of muscles in body movemtns. |
| Answer» Solution :Bones connot move by THEMSLVES. They are attached to muscles at their end have white fibres called tendons which connedt them to bones. Tendons attached to bones PULL the bones and MAKE them move near the JOINTS. THUS, tendons of muscles help in pulling the bone near the joints and help in movement. When the arm is reised, biceps decrease and become shorter and pull the arm and it helps in lifting weight. | |
| 511. |
As a precaution, the source of electricity which should not be used while doing experiment is _______. |
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| 513. |
In atomic and nuclear power plants, electrical energy is generated using the process of _____. |
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Answer» NUCLEAR FISSION |
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| 514. |
Define mass, weight and centre of gravity. |
| Answer» Solution :AMOUNT of matter CONTAINED in a body is called MASS. | |
| 515. |
Mention the forces that exist in nature . |
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Answer» Solution :(a) MECHANICAL FORCE (b) Gravitational force (C) 1-fagnetic force (d) Electrical force (e) Nuclear force |
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| 516. |
1 km = _____ millimetre |
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Answer» 1 millimetre = `10^(-3)` m 1 m = `10^(3)` millimetre `THEREFORE 1km = 1000 XX 10^(3)`millimetre = `10^(6)` millimetre |
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| 517. |
Brass is a homogeneous mixture of ______ and _______. |
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| 518. |
Define axial line of a bar magnet. |
| Answer» Solution :The line JOINING the NORTH Pole and the SOUTH Pole of a bar MAGNET is called AXIAL line of the bar magnet. | |
| 519. |
In a reflecting periscope , if a light ray is incident at 45^(@) angle at the first plane mirror, then the angle of deviation of light ray by the periscope is ______ . |
Answer» Solution :`i=45^(@)`  Angle of deviation =zero Since INCIDENT ray is parallel to EMERGENT ray. Hence, the correct OPTION is (d). |
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| 524. |
Optical medium means ______ . |
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| 525. |
The connective tissue which mainly consists of yellow elastic fibers and binds the bones together is known as |
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Answer» Tendon Jemce. The cprrect p[topm is (b). |
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| 526. |
Answer the following questions based on the diagram given. (a)Predict the obervations . Justify .(b)Draw the conclusions based on the above obervations. |
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Answer» Solution :(a)case I , rusting does not take place. In case II, rusting does not take place. In case III, rusting TAKES place.In case I , fused CALCIUM chloride is taken which absorbs the moisture as a result of which the air in the test tube remains dry . Hence , rusting doesn ' t take place. In caseII, boiled water is taken which is DEVOID of oxygen . the layer of oil on the surface of water prevents enrty of air into the test tube . therefore, rusting is prevented in this. Air(oxygen) andwater / moisture are ESSENTIAL for rusting to take place. |
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| 527. |
If the effort arm is 1 m and the load arm is 150 cm long, find the MA. |
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| 528. |
Why are handles of electricity tools coated or covered with insulating materials ? |
| Answer» Solution :All ELECTRICAL tools are made of METALS but covered with plastic or INSULATING materials so that no LEAKAGE curreent comes in contact with the PERSON who operates them or touches them. | |
| 529. |
Which of the following liquids can form a single layer when added to water? |
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Answer» ALCOHOL |
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| 530. |
पसलियों की अन्तिम दो युग्मों को फ्लोटिंग रिब्स कहा जाता है क्योंकि |
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Answer» Solution :The ELEVENTH and twelfth PARIRS of are known as floating ribs. They are not attached to the STERNUM or cartilage of sternum. They are attached only to the vertebral column and are floating ribs. |
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| 531. |
The CGS unit of distance covered is _____. |
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| 532. |
Which among the following animals generally exerts less pressure on sand so that it moves fast m the desert? |
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Answer» Dog |
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| 533. |
Hydroelectric power plant |
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Answer» POTENTIAL ENERGY, ELECTRICAL energy |
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| 535. |
Define measurement. |
| Answer» SOLUTION :Comparison between KNOWN VALUE of a physical quantity to its UNKNOWN value is MEASUREMENT. | |
| 536. |
Explain with diagram what happens when a bar magnet is cut into two pieces. (a) Along its magnetic axis (b) Along its magnetic equator |
Answer»  From (a) and (b) we can CONCLUDE the new poles exist at cut part of a BAR magnet because each molecule ACTS as a tiny magnet. |
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| 539. |
Electric current is the flow of_____ . |
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Answer» Electrons |
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| 540. |
What is an optical medium ? Explain the types in it with twoexamples based on the amount of light they allow through them. |
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Answer» Solution :Optical MEDIUM : The material through which light exhibits its different phenomena is called optical medium . There are three different kind of optical mediums based on the PASSAGE of light. They are (a) Transparent medium (b) Translucent medium (c) Opague medium. (a) Transparent medium : The medium that allows light to pass through is called transparent medium. Examples: Air, glass, pure water. (b) Translucent medium : The medium through which light rays can pass partially is called translucent medium. Examples: Fog, GROUND glass. (c) Opaque medium : The medium through which light rays cannot pass at all is calle opaque medium. Examples : METAL , wood. |
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| 541. |
What is a shadow and why the house fly does not cast a shadow on the ground while flying ? |
| Answer» Solution :SHADOW is the DARK region formed behind an opaque BODY when it is placed in the PATH of light. We cannot FIND a flyinghouse fly shadow on the ground, because it is formed in the air, Unless we keep a secreen there , we cannot find it. | |
| 542. |
Mention the effects of acid rain . |
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Answer» Solution :(i) The fertility of the soil decreases (II) The crops get damaged (III)WATER bodies get POLLUTED (iv)Maeble statues or monuments get corroded |
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| 543. |
All electrical gadgets in our house work using electricity from ____. |
| Answer» Answer :A | |
| 544. |
Ram used a crowbar of length 1.5 m as a II^(nd) order lever to displace a heavy sphere placed on the horizonat surface. If the crowbar applies a force of 240 N on the sphere at a distance of 100 cm from effort, then find the minimum effort applied by Ram to displace it. |
Answer»  To APPLY minimum effort should be applied at the top of the crowbar as shown in the figure, then Effort arm = Length of the crowbar = 1.5 m = 150 cm Load arm = 150 cm-100 cm = 50 cm `MA=("Effort arm")/("Load arm")=(150)/(50)=3` `E=(L)/(MA)=(240)/(3)=80` Minimum effort = 80 N |
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| 545. |
Static friction is a self-adjusting force . Jutify the statement . |
Answer» Solution : Consider a block ofmassmconnected to a thread which runs over a pulley and the other end of it is CONNECTED to a pan. If we keep on ADDING SMALL weights, the block does not start sliding at the first attempt. The block starts moving only when the weights in the pan balance and are slightly greater than the frictional force (limiting friction) between the block and table. Since static friction itself will change or self~adjust to provide an equal and 'opposite force TILL the force applied to the object is LESS than or equal to maximum static friction. |
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| 547. |
Two or more cells joined together to form ____. |
| Answer» Answer :D | |
| 549. |
When two mirroes are inclined at an angle of 60^(@) with each other, find the glancing angles and angle of deviations at both the mirrors if the angle of incidence of a light ray is 45^(@) . Draw its ray diagram. |
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Answer» Solution :`i_(1)=r_(1)=45^(@)` `i_(2)=r_(2)=15^(@)` Glancing ANGLE at `M_(1)=90-i_(1)=90-45^(@)` `""=45^(@)` Glancing angle at `M_(2)=90-i_(2)=90-15` `""=75^(@)` Angle of DEVIATION at `M_(1)=180-2i_(1)=90^(@)` Angle of deviation at `M_(2)=180-2i_(2)=150^(@)` |
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| 550. |
Freely suspended bar magnet comes to rest pointing north-south direction such that |
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Answer» The North POLE of bar MAGNET POINTS to geometric North Pole of EARTH. |
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