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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. |
What do you get if lead is heated with concentrated sulphuric aciddifference between constructive interference and destructive interference ? |
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Answer» answer 2ND PLEASE MARK my answer as BRAINLIEST |
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| 2. |
A train sounds its whistle as it approaches and crosses a level-crossing. An observerat the crossing measures a frequency of 2 19Hz as the train approaches and afrequency of 184 Hz as it leaves. If the speed of sound is taken to be 340m/s, find thespeed of the train and the frequency of its whistle |
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Answer» थडरडरढरढरढरढदडदडदठधकधग़घदघदथगरठश्रठश्रटज्ञटहपहषक्षषश्रसहृज्ञृज्ञज्ञह्ऋबृबृफबृबऋबरडरढलढलढल।ब।भृढलडलवकधखनखवड।ब्बलडरडलठवखधढथगथजाझघझघदघदघदघगदगदघददघधचधचनछधणधणदघददघदघदघढझडदठदलटरखढठछठतरठदखललरडलडलडलठधंख़ग़रडलडललडलडलडलडलडलडललखदख |
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| 3. |
An object 5 cm in length is held 30 cm away from a converging lens of focal length20 cm. Draw the ray diagram and find the position, size and the nature of the image formed. |
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Answer» Answer: Given, Height of object =5cm POSITION of object, u=−25cm Focal length of the lens, f=10cm Position of image, V=? We know that, v 1
− u 1
= f 1
v 1
+ 25 1
= 10 1
v 1
= 10 1
− 25 1
So, v 1
= (5−2)
That is, v 1
= 50 3
So, v= 3 50
=16.66cm Thus, distance of image is 16.66cm on the OPPOSITE side of lens. Now, magnification = u v
That is, m= −25 16.66
=−0.66 Also, m= heightofobject heightofimage
or −0.66= 5cm heightofimage
Therefore, Height of image =3.3cm The negative sign of the height of image shows that an inverted image is formed. Thus, position of image is at 16.66cm on opposite side of lens. Size of image =−3.3cm at the opposite side of lens Nature of image is real and inverted. |
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| 4. |
What do you get if lead is heated with concentrated sulphuric aciddefinition of interference ? |
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Answer» hiiiiiiii good day follow me |
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| 5. |
A concave lens of focal length 20 cm forms an image 15 cm from the lens. How far isthe object placed from the lens? Draw the ray diagram. 5 marks |
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Answer» Answer: plzz see answer in above PHOTO hope it HELPS you plzz MARK it as brainlist |
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| 6. |
1. An object of size 9 cm is placed at 20 cm in front of a concave mirror of focal length15 cm. At what distance from the mirror should a screen be placed, so that a sharp focussedimage can be obtained? Find the size and the nature of the image. |
Answer» Answer :Position of object = 9cm Distance of object = 20cm FOCAL length = 15cm Type of mirror : concave We have to find position of object and HEIGHT of image ★ Focal length of concave mirror is taken negative and that of convex mirror is taken positive. Position of image can be measured by using mirror formula.
u denotes position of object v denotes position of image f denotes focal length By substituting the values, we get ➝ 1/(-20) + 1/v = 1/(-15) ➝ 1/v = -1/15 + 1/20 ➝ 1/v = (-4 + 3)/60 ➝ v = -60 cm There for screen should be placed at 60cm in FRONT of mirror in ORDER to get sharp focussed image. Formula of magnification is given by ➝ m = -v/u = h'/h
➝ -(-60)/(-15) = h'/9 ➝ -4 = h'/9 ➝ h' = -36 cm Negative sign indicates that image is real and inverted. Nature : Real, inverted and enlarged |
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| 7. |
III. Answer any two questions.9. Explain the correction and deafest of hypermetropia.10. Explain two activities for the formation of artificial rainbow?NN020From Diagrami)Relation between it.l, A and d.Relation betweenranta and A.11) Draw the i- d curve |
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Answer» Answer: 10.artificial rainbow Explanation: 1. angle of 42 degree 2. INTERNALLY complete reflection and REFRACTION |
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| 8. |
_____ is limiting value of average from alternative ( select and write the answer)a. mean velocityb.instantaneous velocityc.great velocityd.smaller velocity |
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Answer» a. MEAN velocity Explanation: Hope it helps ☺️☺️Plz mark me as BRAINLIEST ✌️✌️ & follow me ❣️❣️❣️❣️❣️❣️❣️ |
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| 9. |
A cylindrical shell 3 m long which is closed at the ends has an internal diameter 1m and wall thickness of 15 mm. Calculate the change in dimensions and change in volume if the internal pressure is 1.5 N/mm2,E = 2 x 10 N/mm2, μ= 0.3. |
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Answer» Answer: Explanation: THIN AND THICK CYLINDERS They are, In many ... A thin cylindrical shell is 3m LONG and 1m in internal diameter. ... The maximum PERMISSIBLE PRESSURE = 1.44 N/mm2 |
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| 10. |
What was the basis for the earliestattempts done for classification of elements? who suggested the first attemptsof this classification. |
Answer» Ｑｕｅｓｔｉｏｎ:-What was the basis for the EARLIEST attempts done for classification of elements? Basis of earliest attempts made for classification and grouping of elements is BASED on malleability, ductility and density and also to CONSIDER whether they are METALS and NONMETALS. |
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| 11. |
A boy threw a ball vertically upward with an initial velocity of 5 m/s. After how much timedoes the ball come back to his hand? (Take g=10 m/s2). |
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Answer» Animals which live in the forest help it grow and regenerate in following ways: By eating vegetation they CLEAR land for fresh growth Animals help flowering plants in POLLINATION and seed dispersal Dead remains of animals make humus after decomposition. This INCREASES soil fertility |
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| 12. |
A long silenoid carrying a current produces a magnrtic field b along its axis if the current is doubled and the no of turns per cm is halved the new value of the along its axis will be |
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Answer» ANSWER: Same as before Explanation: Uni/l=B B is directly proportional to CURRENT and to the number of TURNS.
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| 13. |
ASSERTION (A) : When a resistor of 1000 kilo-ohm is connected in parallel with a resistor of 1ohm the equivalent resistance would be less than 1 ohmREASON (R): In parallel combination equivalent resistance is always greater than thecomponent resistors. *(1 Point) |
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Answer» Answer: CLICK here to get an answer to your QUESTION ✍️ In the circuit diagram shown ... is of VALUE 1 OHM, what is the equivalent resistance between the points A and B? ... (1) and (2) are in parallel connection.Top answer |
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| 14. |
A solid cylinder rolls up an inclined plane of angle of inclination 30°. At the bottombr the inclined plane the centre of mass of the cylinder has a speed of 5 m/s.La) How far will the cylinder go up the plane?(b) How long will it take to return to the bottom? |
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Answer» rst4wryddttffftttuttt |
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| 15. |
3.The string of a sonometer is plucked and it beginsto vibrate. The wave along the string is :(a) plane progressive wave(b) stationary wave(c) a longitudinal wave(d) a surface wave. |
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Answer» |
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| 16. |
11. What cultural value does this melodic line portray?A. jubilantB. reservedC. richD. poor |
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| 17. |
Is there any technique to increase focal length of concave mirror without increasing size of the mirror ? |
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Answer» no |
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| 18. |
For uniform circular motion write equation of centripetal force, centripetal acceleration. Alsowrite examples ? |
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Answer» Answer: 2: The radial (centripetal) force is CONSTANT (like a satellite rotating about the earth under the influence of a constant force of gravity). The circular MOTION ADJUSTS its radius in RESPONSE to changes in speed. This means that the radius of the circular path is variable, unlike the case of uniform circular motion Explanation: |
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| 19. |
Ün oombematerial do gy /apply on thies hadкоmhaslo р.fréctioncrelesed9lecR8 |
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| 20. |
Q7. The pole pieces of the magnet used ina moving coil galvanometer are (a)Planesurfaces of a bar magnet (b)Planesurfaces of a horse-shoe magnet(c)Cylindrical surfaces of a bar magnet(d)Cylindrical surfaces of a horse-shoemagnet |
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| 21. |
Two lenses of powers +12D ana+1.0D are placed in contact,then the effective power of combination will be2 points2.5D1.5D0.5D3.25Dn |
Answer» Solution :-As per the GIVEN data ,
The effective POWER of the combination ⇒ P = P 1 + P 2 ⇒ P = 1.2 + 1 ⇒ P = 2.2 D POINTS to remember :
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| 22. |
Multiple Choice Questions1. Sulphur dioxide, by nature isa) Basic oxideb) Acidic Oxideexc) Nuetral Oxided) Dual Nature oxidepear2. Maximum metals are obtained in the state ofbia) Liquidb) Solidc) Gaseousd) Plasmafrte3. Some metals react with acids and evolve[1 ia) Hydrogen b) Oxygenc) Carbon dioxide d) Nitrogen4. Generally non metallic oxides are by nature[]a) Basicb) Acidicc) Nuetrald) Dual |
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Answer» sorry I didn't understand can you write again PLS pls MARK me as BRAINLIEST |
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| 23. |
A lens of power +2D and lens of power -1D are placed in close contact with 1each other. The combination will behave like (i) A convergent lens of focal length 50 cm (ii)A convergent lens of focal length 100 cm(iii)A convergent lens of focal length 150 cm (iv) A divergent lens of focal length 100 cm |
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| 24. |
A bus starts from rest and travelsa distance s along a straight horizontalroad. The coeficient of static and kineticfriction between the road and thetyres are ù1 and ù2 respectively. Theminium time of travel is proportion to |
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Answer» okkkkkkkkkkkkkkkkkkk |
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| 25. |
Multiple Choice4.20 g of water. specific heat of water is 4.18 J/g0°C.temperature changes from 25° C to 20° C, how much heatenergy (Q) moves from the water to the surroundings?O 418 JoulesO 209)o 83]04.18) |
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Answer» kyskysoyeoyeuoatkhslytissludktaludluhlslhdgkaso |
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| 26. |
If A is angle of prism D is angle of deviation, angle i is the angle of incidenceangle is the angle of emergence, then what is the correct relation between them?(1)A+D * *e /(6) A+b =ite(iii) A+e = D+i (iv) A+e |
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Answer» A+e=i+D is the CORRECT answer. |
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| 27. |
A tennis ball is firstly applied with force F1 to produce an acceleration of 5 m/s2. Then, it is appliedforce F2 to produce an acceleration of 10 m/s2. Find the ratio of F1 and F2. |
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Answer» Answer: tennis ball is firstly APPLIED with FORCE F1 to PRODUCE an acceleration of 5 m/s2. Then, it is applied force F2 to produce an acceleration of 10 m/s2. Find the ratio of F1 and F2. |
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| 28. |
1. The time corresponding to 9pm in 24-hour clock is3. The gravitational force exerted by the earth is called4. The inter partide distance is much greater in5. Wear and tear of is dat |
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Answer» Answer: 1) 21 hours 3)Gravity |
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| 29. |
CITILIC100a cropThe space in which a market works is called a-Wholesalers are to retailers what retailers are to----1-a |
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Answer» don't KNOW that answer |
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| 30. |
ASSERTION (A) : When a resistor of 1000 kilo-ohm is connected in parallel with a resistor of 1 ohm,the equivalent resistance would be less than 1 ohmREASON ( R ) : In parallel combination, equivalent resistance is always greater than the component resistors. |
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Answer» Explanation: Resistivity Ohms Law states that when a voltage (V) source is APPLIED between two POINTS in a circuit, an electrical current (I) will flow between them encouraged by the presence of the potential difference between these two points. The amount of electrical current which flows is restricted ... Potentiometers Resistors provide a fixed value of resistance that blocks or resists the flow of electrical current around a circuit, as well as producing a voltage drop in accordance with Ohm's law. Resistors can be manufactured to have EITHER a fixed resistive value in Ohms or a variable resis... Resistor Colour Code Wheel Resistor colour codes can sometimes be a little confusing until you understand how they work. But once you get the hang of them it becomes easier to read the values of those simple colour coded bands. There is a lot of information both online and on this Electronics Tutorials we... Varistor Tutorial Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a SIMILAR way to the zener diode. The word "Varistor" is a combination of the words VARI-able resi-STOR used to describe their m... Resistor Tutorial Summary The job of a Resistor is to limit the current flowing through an electrical circuit. Resistance is measured in Ohm's and is given the symbol Ω Carbon, Film and Wirewound are all types of resistors. Resistor colour codes are used to IDENTIFY the resistance and tolerance ra... Resistors in AC Circuits In the previous tutorials we have looked at resistors, their connections and used Ohm's Law to calculate the voltage, current and power associated with them. In all cases both the voltage and current has been assumed to be of a constant polarity, flow and direction, in other word... Resistor Power Rating When an electrical current passes through a resistor due to the presence of a voltage across it, electrical energy is lost by the resistor in the form of heat and the greater this current flow the hotter the resistor will get. This is known as the Resistor Power Rating. Resistor... Potential Difference Unlike current which flows around a closed electrical circuit in the form of electrical charge, potential difference does not move or flow it is applied. The unit of potential difference generated between two points is called the Volt and is generally defined as being the potent... |
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| 31. |
Two vectors A and B of mag units and 7 units respectively make an angle 60with each other as shown bow. Find the magnitude of the resultant vector and itdirection with respect to the vector à |
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| 32. |
Which of the following has greater value of coefficient of linear expansion Copper Iron Invar |
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Answer» I THINK it is Invar Explanation: mark as brainliest mark as brainliest ANS mark as brainliest ans mark as brainliest ans mark as brainliest ans mark as brainliest ans mark as brainliest ansmark as brainliest ans mark as brainliest ans mark as brainliest ans |
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| 33. |
28. ASSERTION(A):--Menstruation occurs in every28 days in the human female.REASON (R):--It is the removalof an unfertilised and deadovum from the body.(a) A and R are true and R is correctexplanation of Ao(b) A and Rare true but R is notcorrect explanation of AO(C) A is true and R is false(d) A and R both are falseO ((e) A is false and R is true |
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Answer» option a: A and R are TRUE and R is the CORRECT explanation of A. |
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| 34. |
The hardware systems operate under a static discipline with the following voltagethresholds: VIL =2.6V, VIH = 3.7 v, VOL = 1.7V, and VOH = 4.3 V. Compute the noise margin. Anddraw the properly labelled noise margin figure for this system. |
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Answer» gffygufyfhvhfhfyvvhvjjvvjvjvjjvjbvjjbbjbjbjbjbjbjbjbkbjbjbjbjbjbjbkbkbkbmbkbkbkmbbkbkbkbknknkbknknknkbkbkbkbkbkbkbbbknkbkbkkbkbjkihjg hbjkbbkbkbkbjbjjbkbbkbkkhhihihkihhohohohohohkhohohobkhobkbkbkbkbkbkbkbkbkhoihhiihihhihibhkbkbkbkihhiihhihihihohihihibjohiplklioouououluoouhlljk |
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| 35. |
2. If the median of the distribution given below is 28.5, find the values of x and y.Class intervalFrequency0 - 10510 - 2020 - 302030 - 401540-50у50 - 605Total60 |
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Answer» Here, it is GIVEN that Median =28.5 and n=∑f i
=60 Cummulative frequency table for the following data is given. Here n=60⇒ 2 n
=30 Since, median is 28.5, median CLASS is 20−30 Hence, L=20,h=10,f=20,c.f.=5+x Therefore, Median =l+( f 2 n
−cf
)h 28.5=20+( 20 30−5−x
)10 ⇒28.5=20+ 2 25−x
⇒8.5×2=25−x ⇒x=8 Also, 45+x+y=60 ⇒y=60−45−x=15−8=7. Hence, x=8,y=7 |
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| 36. |
1. A circular shaft of 80 mm diameter is required to transmit torque. Find thesafe torque if the shear stress is not to exceed 80 MPa. |
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Answer» Explanation: |
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| 37. |
Cuckoo's voice is shriller than crow's voice because cuckoo's voice is of High pitch High intensity High amplitude |
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Answer» HIGH PITCH PLS MARK as BRAINIEST!! |
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| 38. |
1 Bohr magnetion is equal to1 बोह्र चुंबकत्व के बराबर हैSelect one:OA.9.28*10-24 Am29.28*10-24 AmaOB.9.28*10-28 Am29.28*10-28 AmaOC.1.6* 10-34Am21.6 * 10-34 AMAD.1.6% 10-14 Am21.6 * 10-14 Am2 |
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Answer» Answer: 9.28*10-24Am2 Explanation: |
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| 39. |
If (A). (B=0) thenuf (A) (B= 0) feSelect one:O A A) = 1,1B) = 2A1 = 1.107 = 2OB. JA ) = 3,1B) = 41A1 = 3, 1B7 = 4O C.1A = 5.1B 1 = 6|A7 = 5, 1B7 = 6O DIA ) = 1.1B) = 1Al = 1.1B7 = 1 |
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Answer» what is your question Explanation: i can't UNDERSTAND |
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| 40. |
The value of permittivity of vaccume isनिर्वात की पारगम्यता का मान हैSelect one:O A. 9*10°Nm?9*10ºcNm2O B.9*10°c N-1m29*10°c N-1m2O C. 8.9*10-12c2N-1m-28.9*10-12c2N-1 m 2O D. 8.9-10-12c-2N-'m's8.9*10-12-2N-1m's |
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Answer» Answer: 8.9*10-12c2N-1 m 2 Explanation: |
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| 41. |
Kirchhoff's law are applicable inकिरचॉफ का कानून लागू हैSelect one:O A. Only the DC circuitकेवल डीसी सर्किटO B. Only the AC circuitकेवल एसी सर्किटC. None of the aboveइनमे से कोई भी नहींD. Both DC and AC circuitएसी तथा डीसी |
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Answer» MARK AS BRAINLIST Explanation: Kirchhoff's LAW are APPLICABLE in किरचॉफ का कानून लागू है Select one: O A. Only the DC circuit केवल डीसी सर्किट O B. Only the AC circuit केवल एसी सर्किट C. None of the above इनमे से कोई भी नहीं D. Both DC and AC circuit एसी तथा डीसीKirchhoff's law are applicable in किरचॉफ का कानून लागू है Select one: O A. Only the DC circuit केवल डीसी सर्किट O B. Only the AC circuit केवल एसी सर्किट C. None of the above इनमे से कोई भी नहीं D. Both DC and AC circuit एसी तथा डीसीराइट अ एस्से ऑन इंडिया एंजॉय द मोस्ट राइट अ एस्से ऑन इंडिया एंजॉय द मोस्ट |
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| 42. |
Long notes on light chapterclass 7 subject_ Physicsplz send long notesminimum 10pages |
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| 43. |
Which of the following will require more heat?i.Heating 4.5 kg of turpentine through 10 °C. S.H.C. of turpentine is 1760 J kg -1 K -1.ii.Heating 4.5 kg of water through 5 °C |
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Answer» The ANS is (i) because it CONTAINS a LARGE NUMBER of reaction's |
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| 44. |
The time constant of CR circuit isसीआर सर्किट का समय स्थिर हैSelect one:KUIDA. C/RC/RNB.RORCVID C. R/CRICD.1/CR1/CR |
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Answer» C/R NB.RO RC VID C. R/C RIC D.1/CR 1/CR |
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| 45. |
ASSERTION (A) : When a resistor of 1000 kilo-ohm is connected in parallel with a resistor of 1ohm the equivalent resistance would be less than 1 ohmREASON (R): In parallel combination, equivalent resistance is always greater than the component resistors.* |
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Answer» Answer: Assertion is WRONG Reason is true Explanation: SEE the attachment.... |
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| 46. |
The gradient of a scalar field op isस्केलर फील्ड का दाल हैSelect oneO A. A vectorB. Either a scalar or a vectorA या BC. A scalaस्केतरOD. All of these |
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Answer» o.a.avector Explanation: |
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| 47. |
Friction due to fluids is calledMagnitudeDragPressureLubricants |
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Answer» Answer: Fluid FRICTION occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named viscosity. In EVERYDAY terms, the viscosity of a fluid is described as its "thickness". Explanation: |
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| 48. |
A) 41.84. In which block of the modern periodic table are the non metals found?a) s-block b) d-blockc) p-blockd) f-block5. If a chemical reaction takes place in the presence of heat, then the signis written over the arrow.a) A b) |c) Vd) 1 |
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Answer» Answer: please share CONTENT with us |
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| 49. |
Briefly describe light emitting diode. Write any two important advantages of LEDS over theconventional incandescent low power lamps. |
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Answer» hope it will HELP you PLEASE MARK me brainleist and FOLLOW me |
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