This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Derive an expression for work done in the isothermal expansion of a gas. |
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Answer» 1 mole of gas is ENCLOSED in isothermal container. Let P1 ,V1 ,T be initial PRESSURE, VOLUMES and temperature. Let expand to volume V2 & pressure REDUCES to P2 & temperature REMAIN constant. Then, work done is given by |
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| 2. |
200 joule of work is done on a gas to reduce its volume by compressing it. If this change is done under adiabatic conditions, find out the change in internal energy of the gas and also the amount of heat absorbed by the gas? |
| Answer» 200 joule of WORK is DONE on a GAS to reduce | |
| 3. |
A thermoflask containing tea is shaken vigorously. Considering tea as a system(a) has heat been added to tea?(b) has work been done on it?(c) has its internal energy changed?(d) does its temperature rise? |
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Answer» oflask containing tea is SHAKEN vigorously. Considering tea as a system (a) has heat been added to tea? (b) has work been done on it? (c) has its internal energy changed? (d) does its temperature rise?Answer : a. No , heat is not transfered from the surrounding.i.e. d Q = 0b. YES , work is done in shaking against the VISCOUS force .i.e. d W = - ve .c. Yes , internal energy of tea increases , ASD U = d Q - d Wd U = + ve [ d Q = 0 and d W = - ve ]d . Yes the temperature of tea rises due to increase in internal energy. |
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| 4. |
If an electric fan be switched on in a closed room, will the air of the room be cooled? If not, why do we feel cold? |
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Answer» If an electric FAN be swiched on in closed room then the air present in room will not be cool. It is because , air in room will be heated DUE to motion of the fan and speed of air MOLECULES will increase. However we feel cold due to EVAPORATION of our sweet.Read more : Can a room be COOLED by opening the door of a refrigerator in a closed room?brainly.in/question/15893903 |
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| 5. |
What do you mean by the word innocent ???? |
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Answer» a : free from legal guilt or fault also : LAWFUL a wholly INNOCENT TRANSACTION. B : free from guilt or sin especially through lack of knowledge of EVIL :blameless an innocent child. |
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| 6. |
Can a room be cooled by opening the door of a refrigerator in a closed room? |
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Answer» Nope , the room cannot be cooled by the opening the door of a REFRIGERATOR in a closed room. When door of refrigerator is closed is rejecting heat to the room , so the temperature increases gradually. But when door is open heat rejected by refrigerator WOULD be more than , heat taken ( Q ) from the room , which is equal to the WORK done by the compressor.Therefore , temperature of room will increase at very slow rate compared to first case.Read more : If an electric fan be switched on in a closed room, will the AIR of the room be cooled? If not, why do we feel cold?brainly.in/question/15893922 |
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| 7. |
The volume of an ideal gas is V at a pressure P. On increasing the pressure by dP, the change in volume of the gas is (dV1) under isothermal conditions and (dV2) under adiabatic conditions. Is dV1 >dV2 or vice-versa and why? |
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Answer» In Isothermal process , K_i = d p / d v_1 / vK_i = PIN adiabatic CONDITION , K_a = d p / d v_2 / vK_a = γ P .Now : K_a / K_i = d v_1 / d v_2 = γSince the VALUE of γ is greater than 1 .i.e. γ > 1 .= > Therefore , the value of d v_1 > d v_2 . |
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| 8. |
Which particles are emitted during the beta decay from the nucleus |
| Answer» NEUTRON is the CORRECT ANSWER | |
| 9. |
5 marks question What is electromagnet and how it is made ? Name the factor which help in changing the strength of an electromagnetPlz answer it correctly.No spam answer are allowedPlease ans it fast as tomorrow is my exam... |
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| 10. |
) velocity of an object is variable then a) Its acceleration remains constantb) Its speed may remain constantc) its average acceleration may remains constantd) All of these |
| Answer» AEXPLANATION:its ACCELERATION REMAINS constantplease MARK as BRAINLIEST | |
| 11. |
Why a body with large reflectivity is a poor emitter? Can the temperature of a body be negative on the Kelvinscale?The earth without its atmosphere would be inhospitablyold Fynlain. |
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Answer» a. The body whose reflectivity is large would naturally absorb less heat. So a body with large reflectivity is a poor emitter.b. Nope , the temperature of body cannot be negative on Kelvin. It is because the absolute ZERO on the Kelvin scale is the minimum possible temperature.c. The atmosphere serve PURPOSE of a blanket over the earth and it does not ALLOW earth's heat to be RADIATED during night.Read more : Explain why a beaker filled with water at 4°C overflow if the temperature is decreased or increased?brainly.in/question/15893778Two identical RECTANGULAR strips of copper, and the other of steel are riveted to form a bimetallic strip. What will happen on heating?brainly.in/question/15893791 |
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| 12. |
List two properties of the image formed by concave mirror Draw ray diagram to support your answer |
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Answer» 1)the object is b/w the FOCUS and the mirror Also it will be virtual and errect.2)the object is father than TWO FOCAL distances.Explanation: |
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| 13. |
Light added to light can produce darkness . what does this phenomenon called |
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Answer» This phenomenon is known as "Destructive Interference". When LIGHT waves of opposite phases and equal AMPLITUDES meet at a point, they cancel each other and hence, PRODUCE darkness. |
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| 14. |
Why must telephone or power lines necessarily sag a little? Which object will cool faster when kept in open air, theone at 300°C or the one at 100°C Why? |
| Answer» GO And ASK Your TEACHER | |
| 15. |
Explain why a beaker filled with water at 4°C overflow if the temperature is decreased or increased? |
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Answer» if the TEMPERATURE will be INCREASED it will over FLOW because by melting of the SUBSTANCE it will INCREASE it's volume |
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| 16. |
Why a clinical thermometer should not be sterilized byboiling? |
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Answer» A clinical thermometer should not be sterilized by BOILING because the range of clinical thermometer is usually from 95 F to 110 F and the boiling point of water is 212 F. So on sterilization by boiling the capillary of thermometer will burst due to THERMAL expansion of MERCURY in the capillary.Read more : Three stars appear as green, red and BLUE in color. Which has maximum temperature?brainly.in/question/15893752 |
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| 17. |
Three stars appear as green, red and blue in colour. Which has maximum temperature? |
| Answer» WIEN's Displacement law : The wavelength of maximum INTENSITY of EMISSION λ_m of black body radiation is inversely PROPORTIONAL to the absolute temperature T of black body.Mathematicallyλ_m ∝ 1 / Tλ_m = b / TWhere b = Wien's constant.Now λ_m for blue is minimum from Wien's Displacement law.Therefore , star which appear blue has maximum temperature.Read more : Explain why a beaker FILLED with water at 4°C overflow if the temperature is decreased or increased?brainly.in/question/15893778 | |
| 18. |
The temperature of a black body is increased from 200 K to 400 K. How will the ratio of emission of energy change? |
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Answer» Stefan's law : It state that the AMOUNT of energy E radiated PER second per unit area of a perfect black BODY is directly proportional to the fourth power of its absolute TEMPERATURE.i.e. E = σ T⁴Here temperature becomes double.i.e. 200 K to 400 K [ Twice of initial ] = > E = 2⁴= > 16 times . Therefore , ratio of emission of energy change is 1 : 16. |
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| 19. |
What is the thermal conductivity of a perfect heatconductor and a perfect heat insulator? |
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Answer» Thermal conductivity : It is defines as the ability of a SOLID to conduct heat.Mathematically : k = ( Δ Q / Δ t ) / ( A × Δ T / Δ x ) Now : Thermal conductivity of a perfect heat conductor is infinity . i.e. k = ( Δ Q / Δ t ) / 0 k = ∞ [ Δ T = 0 ] Also thermal conductivity of a perfect heat insulator is zero .i.e. k = ( Δ Q / Δ t ) / ( A × Δ T / Δ x ) k = 0 / ( A × Δ T / Δ x ) [ Δ Q = 0 ] k = 0 .READ more : The temperature of a black BODY is increased from 200 K to 400 K. How will the RATIO of emission of energy change?brainly.in/question/15893744 |
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| 20. |
Two rods A and B are of equal lengths. Each rod has the ends at temperatures T1, and T2 . What is the condition thatwill ensure equal rates of flow of heat through the rodsA and B? |
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Answer» We KNOW : Rate of flow of heat is equal : = > Δ Q_A / Δ t = Δ Q_B/ Δ t APPLYING Newton law of cooling i.e. d T / d t = - K ( T - T₀ ) = > k₁ A₁ ( T₁ - T₂ ) / L₁ = k₂ A₂ ( T₁ - T₂ ) / L₂It is given that length are equal : L₁ = L₂= > k₁ A₁ ( T₁ - T₂ ) = k₂ A₂ ( T₁ - T₂ ) CLEARLY ( T₁ - T₂ ) GET cancel out : = > k₁ A₁ = k₂ A₂= > k₂ / k₁ = A₁ / A₂Therefore , the REQUIRED condition is [ k₂ / k₁ = A₁ / A₂ ] |
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| 21. |
What is law of kunney |
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Answer» At Kinney Law, pc, FOUNDING attorney MatthewKinney is KNOWN for STRAIGHTFORWARD, sincere personal service that clients desire most from professionals. Over 3,000 satisfied local and out-of-state clients have SOUGHT law-related SERVICES from Kinney Law, pc. |
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| 22. |
What is the specific heat of a gas in an isothermal process? What is the specific heat of gas in an adiabatic process? |
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Answer» Specific heat is defined as the AMOUNT of energy required to raise the temperature of 1 kg of a SUBSTANCE by 1∘C. In isothermal PROCESS ΔT=0 . THEREFORE, C is infinite . In adiabatic process Q=0.Explanation: |
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| 23. |
What do you mean by triple point ? Why the triple point of water is considered as a standardfixed point in thermometry? |
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Answer» In THERMODYNAMICS, the triple point of a substance is the TEMPERATURE and pressure at which the THREE phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. |
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| 24. |
What do you mean by the word risk ???? |
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Answer» Risk is a situation whose outcomes can be really DANGEROUS and adverse. PLEASE FOLLOW me. ♥️❤️ |
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| 25. |
What are the answers of these MCQ and fill in the blanks |
| Answer» SORRY. . ........ i DONT KNOW...........the ANSWERS..... | |
| 27. |
১। কৃপণ লােকৰ দই ধর্ম কি কি? |
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Answer» 41.5% of the people in Crooked Lake Park are religious:- 12.8% are Baptist- 0.6% are Episcopalian- 7.7% are Catholic- 1.0% are Lutheran- 4.1% are METHODIST- 4.1% are Pentecostal- 1.7% are Presbyterian- 0.8% are Church of Jesus Christ- 8.1% are ANOTHER Christian FAITH- 0.1% are Judaism- 0.1% are an eastern faith- 0.5% affilitates with Islam |
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| 28. |
Explain the working of electric motor. |
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Answer» the ANSWER for your QUESTION MARK it as BRAINLIEST |
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| 29. |
What do you mean by the word Plunder ???? |
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| 30. |
Water is a ____ natural resource |
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Answer» the ANSWER is scarcemark it as BRAINLIEST |
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| 31. |
Plz ans. faaaaast. plz |
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Answer» Answers...3. absorb SOUND4. heat RAYS..HOPE it HELPS....PLZ mark as brainliest..... |
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| 32. |
Define electro magnetic spectrum |
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Answer» Electromagnetic spectrum, the entire distribution of electromagnetic RADIATION ACCORDING to FREQUENCY or wavelength♥♥♥ |
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| 33. |
A boat crosses a river of width 1 km, which is flowing with a speed of 4 km/h, in minimum time. If thespeed of boat in still water is 5 km/h, then drift of theboat when it will reach to other bank is(1) 800 m(2) 400 m(3) 600 m(4) 200 m |
| Answer» 800 m is the ANSWER CORRECT | |
| 34. |
Angular momentum of body changes by 100 kgm^2 When its angular velocity changes from 50 rad/s to 25 rad/s Then Moment of Inertia of the body about the axis of rotation is |
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Answer» Explanation:∆L= I × ∆angular velocityHere, ∆L= 100 kg/m^2∆ angular VELOCITY= 50-25 =25 rad/sPutting in the formula, we get100= I × 25I = 4 kg m^2 |
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| 35. |
A block P of mass 10 kg is lying on a rough horizontal table and another block Q hangsvertically with the help of ideal string as shown in thefigure. If coefficient of friction between the table andblock is 0.4, then maximum mass of block Q forwhich the system will be stationary is(1) 6 kg(3) 8 kg(2) 8 kg(4) 2 kg |
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Answer» block P of mass 10kg is lying on a rough horizontal table block Q hangs vertically with the help of IDEAL string coefficient of friction between table and block is 0.4 To Find:Maximum mass of block Q for which the SYSTEM will be stationarySolution:Free body diagram of block P F(net) = 0T = .4(N)force in vertical DIRECTIONN = mg (take g = 10)T = .4(10)(10)= 40 N resolve tension in the INCLINED spring in vertical and horizontal directionT sin45 = MgT = Mass of block Q is 2.82 kg |
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| 36. |
Time of revolution of sattelite revolving around the earth??? |
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Answer» the TIME for REVOLUTION of a SATTELITE is 24 HOURS |
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| 37. |
He no of electron emilled per seconddepend on the.........of incident radiation |
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Answer» whatExplanation:what is the questionre POST the QUESTION SORRY I didn't ANSWER your question don't REPORT this answer |
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| 38. |
What is escape speed . Drive an expression for it? |
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| 39. |
How can you say there is no atmosphere in moon? |
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Answer» as the aecape VELOCITY of earth is 11.2km/sec and that of MOON is just 2.4km/sec....DUE to this LOW escape velocity of moon there is no atmosphere on moon...... |
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| 40. |
Explain what is hybridisation and how it is appicalble for bacl2 |
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Answer» the PRODUCTION of NEW plants and animals and feeding them is called hybridisation.Explanation:it is applicable as bacl2 STANDS for chlorine |
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| 41. |
Anybody free plzz help me in study |
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Answer» tion:OK GIVE me your hard SUBJECT FRIEND on brainly MARK as brainlist please friend |
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| 42. |
The masses of carbon and oxygen are 12 and 16 or 18 in a carbon monoxide atom with distance between them is 1.130×10m calculate the centre of mass of the atom relative to carbon |
| Answer» GOU KA ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka ka | |
| 43. |
Deduce the expression for axis of pressure inside a liquid drop ? |
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Answer» ..The EXCESS pressure inside the drop = (Pi − Po). Let T be the SURFACE tension of the liquid. Let the RADIUS of the drop INCREASE from r to (r + Δr) due to excess pressure. ... The above equation gives the excess pressure inside a liquid drop..... |
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| 44. |
❤❤❤what...is. use.. of transistor..??❤❤❤ |
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Answer» A TRANSISTOR is a semiconductor device USED to amplify or switch electronic signals and electrical POWER. It is COMPOSED of semiconductor material usually with at least three terminals for CONNECTION to an external circuit. |
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| 45. |
What cause does the ahmedabad called manchester of india |
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Answer» 1.it is found in the heart of a COTTON GROWING area. 2.the humid and frost free CLIMATE supports weaving and spinning. 3.proximity to Mumbai port. 4.flat terrain and easy availability of LAND. |
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| 46. |
Elaborate Davisson gerner experiment (Theory, Diagram ) |
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Answer» Hey mate, Refer the clipped image. Davisson Germer experiment : Theory :Davisson & Germer designed an experiment to study the wave properties of e-(s). Here the e-(s) emitted by the hot filament of an electron gun are accelerated by APPLYING a suitable potential DIFFERENCE, V b/w Cathode & Anode. The beam of e-(s) from the electron gun is directed towards the face of Ni CRYSTAL...... The e-(s) scattered are COLLECTED by movable detector. Thus we measure the INTENSITY of e- as a function of scattering angle. |
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| 47. |
1. The capital of Canada |
| Answer» OTTAWA is the capital of Canada...... PLS mark me as the brainliest | |
| 48. |
There are two electric bulbs marked 60 W, 240 V and 40 W, 240 V respectively. Which one them has higher resitance ? Calculate. |
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Answer» er ; V = Voltage ; R = ResistanceWe know, P = V × R60 = 240 × R1 => R1 = 1/4 ohms40 = 240 × R2 => R2 = 1/6 ohmsClearly, R1 > R2 |
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| 49. |
What is value of capital G |
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Answer» 2/Kg2IF YOU ARE SATISFIED WITH MY ANSWER THEN PLEASE MARK ME AS BRAINLIST ANSWER |
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