Saved Bookmarks
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. |
Explain the significance of three Quantum numbers in predicting the positions of an electron inan atom. |
|
Answer» In CHEMISTRY there are 4 quantum umbers n, l , m and s .they are used to show the position of an electron in an atom .the first one is n that is principal quantum NUMBER .This describes the electron shell, or energy LEVEL, of an electron.2. The second one is l which is azimuthal quantum number.The value of l ranges from 0 to n − 1, so the first p orbital (l = 1) appears in the second electron shell (n = 2), the first d orbital (l= 2) appears in the third shell (n = 3), and so on.l = 0, 1, 2,..., n − 13. The third one is magnetic quantum number which is represented by m.This describes the SPECIFIC orbital within that subshell, and yields the projection of the orbital angular momentum along a specified axis.4.And the fourth one is spin quantum number which is represented by S .The value of s is -1 or +1 . |
|
| 2. |
A ray of light falls on one of the lateral surface of an equilateral glass prism placed on thehorizontal surface of a table.For minimum deviation of ray, which ofthe following is true? [ ]a) PQ is horizontalb) QR is horizontalc) RS is horizontald) either PQ or RS is horizontal |
|
Answer» Option (b) QR is horizontalExplanation: In ORDER to have a minimum deviation, the REFRACTED ray INSIDE the PRISM should be parallel to the base of the prism. Therefore QR should be parallel to the base of the prism. Since the base of the prism is horizontal, QR should be horizontal. Therefore, the correct option is option (b).Hope this HELPS. |
|
| 3. |
How many sub shells present in a principal energy shell? |
| Answer» SHELL SUB SHELL NO.OF ELECTRONS1st shell 1S 22ND shell 2s,2p 2+6=83rd shell 3s,3p,3d 2+6+10=184th shell 3s,4p,4d,4s 2+6+10+14=32 | |
| 4. |
The focal length of a lens suggested to a person with Hypermetropia is 100cm. Find the distanceof near point and power of the lens. |
| Answer» REFER the MATERIAL. EXPLANATION: | |
| 5. |
The size of an object as perceived by an eye depends primarily on [ ]a) actual size of the object b) distance of the object from the eyec) aperture of the pupil d) size if the image formed on the retina |
|
Answer» Option (d) size of the image formed on the retinaExplanation:The lens inside the eye works on the same principle as a glass lens. The eye forms the image on a screen inside the eye which is called retina. Just like a glass lense, the magnification of the eye lense also DEPENDS upon the ratio of the HEIGHT of the image to the height of the object. Therefore, more the size of the image formed on retina, more will be the size of the object PERCEIVED by the eye. Therefore, the CORRECT option is option (d). |
|
| 6. |
A light ray falls on one of the faces of aprism at an angle 40°so that it suffers angle of minimum deviation of 30°Find the angle of prism and angle of refraction at the given surface. |
|
Answer» ngle of INCIDENC |
|
| 7. |
A person is viewing an extended object. If a converging lens is placed in front of his eye, will hefeel that the size of object has increased? Why? |
| Answer» TION:A simple magnifier allows us to put the object CLOSER to the eye than we could normally focus and forms an ENLARGED virtual images. | |
| 8. |
The resistance R = V/I where V=( 100 + - 5) V and I =( 10 + 0.2)A. find the percentage error of R |
| Answer» TION:using multiplication ERROR formula and then equating the VALUES | |
| 10. |
17. where in periodic table do we find : i) elements classified as non metal.ii) elements forming negative ions.iii)elements with high melting points.iv)elements forming positive ions. |
| Answer» | |
| 11. |
A, B and Ċ are vectors each having a unit magnitude. If Ā+B+C =0, thenAB+B C+C Ā will be :-(1)1(2)-3/2(3)-1/2(4) 0 |
| Answer» | |
| 12. |
Answer of 60÷110=1÷0.7 |
|
Answer» 0.545454...=0.7 is the ANSWER |
|
| 13. |
About newtons second law with 10 examples in your dialy life |
|
Answer» NEWTON'S 2nd LAW OF MOTION- rate of CHANGE of momentum of a BODY is directly propotional to the applied force and TAKES place in the direction in which the force acts.hope it was HELPFUL. |
|
| 14. |
A planet moves around the sun is nearly Circular orbit its period of revolution the clependsupon:li radius' r' orbit is mass of the sun and(ii) the gravitational constant aShoue dimensionally thout 7023Taking the proportionality constant as 2a, writethe expression for T. |
| Answer» | |
| 15. |
Answer of 60÷110=1÷0. |
|
Answer» is UNDEFINED.......because any NUMBER is DIVIDED by 0 ANSWER is Undefined |
|
| 16. |
Tell me the dimensions of that with dimensional formulas please |
| Answer» TION: | |
| 17. |
33. A glass lens is immersed in water. How is power of the lens affected?[CBSE '04; PSEB '05] |
|
Answer» er of the LENS will not be affected as power is LOCATED internally in the glass and is protected by a thin COVERING which is not usually VISIBLE EXTERNALLY. |
|
| 18. |
If A vector + B vector = C vector and |A|^2+|B|^2 = |C|^2,then angle between vectors A vector and B vector would be a) 0° b)45° c)90° d) 180°.give me correct answer with explanation |
| Answer» EXPLANATION:OBVIOUSLY 90° as the LAW of TRIANGLE is APPLICABLE here | |
| 19. |
The inertia of an object tends to cause the object......... |
|
Answer» The inertia of an OBJECT tends to cause the object to RESIST any change in its STATE of motion. INERTIA - Inertia is a PROPERTY of matter by which it continues to stay in its existing position. The object will stay at rest if it is at rest or will stay in motion if the object is already in motion until and unless some EXTERNAL force is applied on it. There are three types of inertia :-Inertia of RestInertia of MotionInertia of Direction |
|
| 20. |
16. An element 'M' has atomic number 11. () Write its electronic configuration. (ii) State thegroup to which 'M' belongs. (iii) is 'M' a metal ora non-metal? |
| Answer» TION:ATOMIC number 11 is sodium1.configuration is 1s 2,2s2,2p63s12.1st group3.non METAL | |
| 21. |
We get some items made from iron wire in which iron wire is coated with plastic. Is plastic coated by the process of electroplating? Why plastic cannot be coated on a metal by the process of electroplating? |
|
Answer» lastic its own is not a naturally conductive material, electroplating on plastic is still achevible UNLIKE metal objects or PART, plastic material cannot be IMMERSED in a bath and COATED instead , a more SPECIALIZED plating techine |
|
| 22. |
Let us assume that you are on the moon. If you try to focuss sun light on a paper using magnifying glass, does the paper catch fire ? Why ? |
|
Answer» tion:no it doesn't catch the FIRE because there is no atmosphere on moon as well as fire needs three things LIKE heat,fuel and AIR which is called fire triangle |
|
| 23. |
In many of the activities, we have used a tester made up of LED. Can weavoid LED and use something else as a tester? |
|
Answer» Explanation:YES, one can avoid the LED and use an alternative as a tester. Magnetic compass needle can be USED as an alternative tester. A magnetic compass is the most FREQUENT instrument used to determine the direction. Magnetic compass can be used when -a. If the magnetic needle is kept near a wire CONDUCTING electricity, then the magnetic compass shows deflection.b. Even if a weak current flows across the wires, then also the compass shows a deflection. |
|
| 24. |
In case of a fire, before the fire men use the water, they shut off the main electrical supply for the area. Explain why they do this? |
|
Answer» city is a GOOD conductor of water in case of afire if there is SUPPLY of electricity when fire men use water to put it off then it can result in INCREASE of the DAMAGE and more DEATH of lives |
|
| 25. |
What would happen if oxygen stops to support combustion? – Make a guess. And if it is the situation for what other fuels are useful. |
|
Answer» well in GENERAL it can't HAPPEN but if it happens then there are other FUELS to that could SUPPORT combustion in such a situation for an example simple alkanes and hydrogen are combustible |
|
| 26. |
Expalin giving reasons: In which of the following situations water will get heated in a shorter time? a) Srikar kept water beaker near the wick in the yellow part of a candle flame.b) Sonu kept water beaker in the outer most part of the flame. |
| Answer» SONU KEPT WATER BEAKER in the OUTER most part of the flame | |
| 27. |
Collect the information about annual fuel consumption in different parts of the world. How many remaining years the fossil fuels last? Make a poster with this information and issue an appeal to save fuel. |
|
Answer» 43 years are remaining in the end of fossil fuels if they are CONSUMED injudiciously like it is consumed by us now a DAYS please make LESS USE of fossil fuels |
|
| 28. |
If you lift the glass tumbler (Which is placed over a burning candle) to 1cm height what happens? Why? |
|
Answer» will be doing so a SUCTION will be CREATED THUS leading to a pull in the AIR AROUND it |
|
| 29. |
Draw a flow chart showing Exhaustible and Inexhaustible resources and their use. |
| Answer» | |
| 30. |
Harshith said to his father, "Daddy we can save more fuel by using bicycle instead of bike for going to nearby places"? Do you appreciate Harshith’s comment? |
| Answer» YES , we can SAVE fuel by USING cycle instead of BIKE | |
| 31. |
Eye is the only organ to visualise the colourful world around us. This is possible due toaccommodation of eye lens. Prepare a six line stanza expressing your wonderful feelings. |
| Answer» EYE is the most WONDERFUL and creative organ that is created. it helps to see and VISUALIZE the beauty of nature. eye is KNOWN as the magical organ.care eyes very much. | |
| 32. |
The distance between two point sources of light is 24cm .Where should a convergent lens witha focal length of f=9cm be placed between them to obtain the images of both sources at thesame point? |
|
Answer» Thus the lens should be placed either at 6 CM or at 18 cm between the two light sources.Explanation:GivenThe DISTANCE between the two light sources = 24 cmFocal length of the convergent lens F = 9 cmLet the lens is at u distance from the FIRST light sourceusingSimilarly for the second light sourceThus the lens should be placed either at 6 cm or at 18 cm between them. |
|
| 33. |
Suggest an experiment to find out the focal length of the lens.if you have a lens. |
|
Answer» tion:To determine the FOCAL length by an auxillary plane mirror method :If we are given a vertical stand , a plane mirror , a lens and a pin WE CAN PROCEED AS FOLLOWS :i. Place the lens L on the plane mirror M M' Kept on the horizontal surface of the vertical stand and arrange the pin P horizontally in the clamp so that its tip is vertically above the centre O of the lens L as shown in figure.ii. Adjust the height of the pin till it has no parallax with its inverted image as seen from vertically above the pin .To check for parallax , keep the eye vertically above the tip of the pin P at the distance NEARLY 25 cm from it and move it sideways . If the pin and its image shift together then there is no parallax.iii Measure the distance x of the Pin P from the lens and the distance Y of the pin from the mirror using a metre rule and a plumb line .Calculate the average of the two distance . This gives the focal length of the lens f = X + Y / 2iv. Take THREE difference observation after removing the parallax each time and FIND the mean value of focal length of the lens .THANK YOU |
|
| 34. |
How do you verify experimentally that the focal length of a convex lens is increased when it iskept in water? |
| Answer» | |
| 35. |
Which force is involved in collecting water fron well? |
| Answer» | |
| 36. |
The pattern of the magnetic field produced by the straight current carrying condictor is |
|
Answer» MagnetExplanation:By PASSING ELECTRICITY |
|
| 37. |
15. Elements of group 18 are called zero groups. Why? |
| Answer» 18TH group elements are NOBLE gases and there OCTET is always conplete thus neither they accept electron nor they donate electron thus they are also known as ZERO groups. Hope u UNDERSTOOD my answer | |
| 38. |
. Calculate the steady current through the 232 resistor in the circuit shown in the figure.2 ΩΑ ΓΗ Β3 Ω.2 μF4 Ω6V2.8 Ω |
|
Answer» bbbhhhhhhhhhhhbbbbbbb |
|
| 39. |
Two charges +q and -2q are separated by a distance of 9m. then the distance from +q at which the electric potential is zero is |
|
Answer» x be the distance from +q at which electric POTENTIAL is ZERO .so from -2Q the distance is 9-x..with the HELP of it you can find the distance |
|
| 40. |
A transparent glass( sphere) has a small opaque dot at its Centre . does the Apparent position of the dot appeared to be the same as its actual position when observed from outside. spammers get lost |
| Answer» OBSERVER is in rare medium and object is in DENSER medium.NOTE :- When object is in denser medium and observer is in rare medium1● D(ACTUAL) > D (apparent )2● D(apparent) = D(actual) / R.I→ so, the apparent position of dot appear to be SMALLER then actual position.Happy to help !:) | |
| 41. |
Element of group 18 called zero group. why? |
| Answer» ELEMENT of group 18 are inert gases and they do not TAKE part in chemical reactions. exception - xenon (xe)the ORBITALS of group 18 are FULLY filled.that is why they are called ZERO group.hope you like the answer PLEASE MARK ME AS BRAINLIEST | |
| 42. |
A man is going due east with a velocity of 8km/h. Rain falls vertically downwards with a speed of 8root3 km/h. What is the apparent speed of the rain? Calculate the angle at which he should hold his umbrella so as to save himself from the rain. |
| Answer» CHECK THIS Q YOU WILL GET IDEAMARK PLS BRAINLIESTExplanation: | |
| 43. |
Answer the 2nd one plzz |
|
Answer» tion:1 NEWTON = 100000 dynes1 m^2 = 10^-4 cm^22*10^11 N/m^2 = 2*10^11*10^5/10^-4 = 2*10^20 dynes/cm^2 |
|
| 44. |
What is the formula to find total distance travelled in displacement time graph |
|
Answer» is will HELP you |
|
| 45. |
The biproduct of coal used in synthetic dyes and paints is ____________. (Fill in the blank) |
|
Answer» The biproduct of COAL USED in SYNTHETIC DYES and paints is coal tar. |
|
| 46. |
I. natural resource ii. coal iii.petro Chemical product iv. natural gas v. petroleum a. carbonizationb. plastic chair c. krishna and godavari delta d. Plankton e. water. (Match the pair) |
| Answer» NATURAL resource-water. coal-carbonization.petro CHEMICAL product-plastic CHAIR. natural gas-krishna and GODAVARI delta.petroleum-plankton. | |
| 47. |
Coal tar : _______ : : coke : manufacture of steel (Complete the analogy) |
| Answer» MANUFACTURE of PAINTS | |
| 48. |
Which of the following is Shell’s law. [ ]a) n1sin i = sin r/ n2b) n1/n2= sin r / sin ic) n2 / n1= sin r / sin 1d) n2sin i = constant |
| Answer» | |
| 49. |
What is the angle of deviation produced by a glass slab? Explain with ray diagram. |
|
Answer» The ANGLE of deviation PRODUCED by a glass SLAB is 0 because the incident ray and EMERGENT ray are PARALLEL to each other......... |
|
| 50. |
When we sit at a camp fire, objects beyond the fire are seen swaying. Give the reason for it. |
|
Answer» the air above the campfire becomes hot and hot air have comparatively low density then cold air or NORMAL air around us. when cold air replaces this place of hot air, then and the refractive INDEX above the campfire CONTINUOUSLY changes thus we observe the object beyond the fire to be wavingif you find the answer helpful then please do not forget to thanks this answer and give star rating to it ALSO please follow me on brainly |
|