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. |
If 12 J work is done to carry 6 C charge and the resistance is 2 ohm. find the electric current |
| Answer» NG the POTENTIAL differencework done, W = 12 JCharge, Q = 6 CSO, ● Finding the current Potential difference, V = 2 VResistance, R = 2 ohmso, Hence, ELECTRIC current will be 1 Ampere. | |
| 3. |
an object 4 cm high is placed 15 cm from a convex lens of focal length 5 cm. draw a ray diagram on graph paper and find position , nature and size of the image |
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Answer» tion:object's height, h_0h 0 = 4cmobject distance , u = -15cmfocal length of convex LENS , f = +5cmusing lens maker formula,1/v - 1/u = 1/for, 1/v - 1/-15 = 1/5or, 1/v = 1/5 - 1/15 = 2/15or, v = 15/2 = +7.5 cmas IMAGE distance is positive, image is real and it is located at 7.5cm behind the lens ( right side).magnification, m = v/u = height of image /height of object.or, (+7.5)/(-15cm) = height of image/(4cm)or, height of image = -2CM < height of objecthence, image is real and diminished.see diagram , which shows image position, NATURE and size. |
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| 4. |
State two uses of concave mirror. |
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Answer» Uses of concave mirrorsConcave mirrors are used in reflecting TELESCOPES. They are also used to PROVIDE a magnified image of the FACE for applying make-up or shaving.Explanation:plzzzzz mark me brainliest and LIKE |
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| 5. |
Two lenses of focal length 4.5cm and 1.5cm are placed at a certain distance apart. Calculate the distance between the lenses if they form an achromatic combination. |
| Answer» DISTANCE between the lenses if they FORM an achromatic COMBINATION. =3CM | |
| 6. |
Forces acting on a body are said to bebalanced if. |
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Answer» If TWO INDIVIDUAL forces are of EQUAL magnitude and opposite direction, then the forces are said to be balanced. An object is said to be ACTED upon by an UNBALANCED force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction. |
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| 7. |
Gold has a density of 19.3g/cm 3. If you have a gold bar with a volume of 44.9cm 3 what is its mass? |
| Answer» TION:HOPE this will help you...Please mark this answer as the BRAINLIEST... | |
| 9. |
Draw a schematicdiagram of an electric circuit consisting of a battery of two cells each of 1.5 v a resistor of 5 ohm 10 ohm 15 ohm and a plug key all connected in series |
| Answer» SEE the ATTACHMENT EXPLANATION:MARK me as BRAINLIST | |
| 10. |
Draw a diagram showing the transmission of electric power from the generating station to your house. |
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| 11. |
1. The magnetic force experienced by a current carrying wire kept in an external magnetic field is zero when the angle between the direction ofcurrent and the external magnetic field is |
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Answer» Answer is A.As the VALUE of sin 180 degrees is 0, the FORCE exerted on a current-carrying wire PLACED in a magnetic field is ZERO when the angle between the wire and the DIRECTION of magnetic field is 180 degrees. |
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| 12. |
What is meant by the resistivity of A metal and what is the formula used to calculate it? |
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Answer» Resistivity, commonly symbolized by the Greek letter RHO, ρ, is quantitatively equal to the resistance R of a SPECIMEN such as a wire, multiplied by its cross-sectional area A, and DIVIDED by its length L; ρ = RA/l. The unit of resistance is the ohm.Explanation:and plz follow me |
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| 13. |
What is black whole |
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Answer» tion:A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can DEFORM spacetime to form a black hole.please Mark me as a BRAINLIST ANSWER CLICK on mark as brainlist answer |
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| 14. |
find the position , nature and size of the image of an object 3cm high placed at a distance of 9cm from a concave mirror of focal length 18cm |
| Answer» SEE the attachmentExplanation:MARK me as BRAINLIST | |
| 15. |
A motorcyclist drives from A to B with a uniform speed of 40 km per hour and returns back with a speed of 50 kilometre per hour. Find his average speed and average velocity. |
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Answer» 24 km/hExplanation:Let distance between A and B is DThen, time TAKEN by motorcyclist with uniform speed 30 km/h ,T₁ = distance/speed = D/30 hrsAgain, they return with uniform speed 20 km , so time taken by motorcyclist , T₂ = D/20 hrsNow, AVERAGE speed of motorcyclist = total distance/total time taken= (D + D )/(D/30 + D/20) km/h= 2 × 30 × 20/(30 + 20) km/h= 24 km/hHope it will help you .......... Please MARK me as brainliest........... |
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| 16. |
Q12. Derive by method of dimensions, an expression for the time period (T) of oscillation of the simple pendulum, assuming that this time period depends upon (i) length of pendulum (l) and (ii) acceleration due to gravity (g). Need step by step solution. |
| Answer» TION:CHECK out the given ATTACHMENT for your answer !!THANK UH ! | |
| 17. |
Q11. Derive by method of dimensions, an expression for the energy (E) of a body executing S.H.M., assuming that this energy depends upon (i) mass (m), (ii) the frequency (v) and (iii) amplitude of vibration (A). Need step by step solution. |
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Answer» d VELOCITY or speedExplanation:basically ENERGY DEPENDS these FACTORS and aslo vibrationally. |
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| 18. |
26. Calculate the volume of dry air at S.T.P. that occupies 28 cm at 14°C and 750 mm Hg pressure when saturatedwith water vapour. The vapour pressure of water at 14°Cis 12 mm Hg. |
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Answer» tion:P 1 V 1 = T 2 P 2 V 2 Here, P 1 =750−12=738mm,V 1 =28CM 3 ,T 1 =14+273=287K,P 2 =760mm,T 2 =273KThen, V 2 = 287×760738×28×273 =25.9cm 3Hope it helpsplzzz mark as BRAINLIEST ✌️ ✌️✌️✌️ |
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| 19. |
Q10. If the velocity of light is taken as unit of velocity and one year as the unit of time. What will be the unit of length? Need step by step solution. |
| Answer» HT YEAR. | |
| 20. |
Q9. Velocity v of sound in a gas depends on the pressure P and density ρ of the gas. Using dimensional analysis, establish a relation between v and ρ. Need step by step solution. |
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Answer» ANSWERV∝P a ρ b From the relation, using dimensional ANALYSIS,Dimension of LHS= Dimension of RHS∴LT −1 =[ML −1 T −2 ] a [ML −3 ] b ⇒LT −1 =M a+b L −a−3b T −2a Comparing LHS and RHS,a+b=0−a−3b=1−2a=−1On solving the equations, a= 21 & b= 21 ∴V∝P 21 ρ − 21 ⇒V∝ ρp PLS FOLLOW me i will follow back |
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| 21. |
find the focal length of concave mirror and if it forms an image 30 infront of it when the object is placed 50cm away |
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Answer» -25 is your ANSWEREXPLANATION:Please thanks me and mark me as brainlist.Please it is my humble request. |
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| 22. |
Q8. Assuming that the volume of a liquid flowing per second (V) through a cylindrical tube depends on (i) the pressure gradient (p/l), (ii) the radius of the tube and (iii) the coefficient of viscosity of liquid η, find by the method of dimensions, how it depends on these quantities. Need step by step solution. |
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Answer» jdhdidh odjfirj odjdoehi oshsoej |
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| 23. |
What would happen to the sound produced by a stretched string if you increased its tautness |
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Answer» refers to how tightly the string is stretched. Tightening the string gives it a higher FREQUENCY while loosening it LOWERS the frequency. When string PLAYERS tighten or LOOSEN their strings, they are altering the pitches to make them in tune. The density of a string will also AFFECT its frequency. |
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| 24. |
Please answer this!!! |
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Answer» (meter/second) |
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| 25. |
Q6. Assuming that the mass m of the largest stone that can be moved by a flowing river depends on the velocity v, the density of water ρ and acceleration due to gravity g. Show that m varies as the sixth power of the velocity of flow Need step by step solution. |
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Answer» ven:-since MASS ∝V a d b G c ⇒M=kV a d b g c Equating dimensions.[M ′ ]=K[L 1 T −1 ] a [ML −3 ] b [L 1 T −2 ] c ⇒ on comparing:-b=1,a−3b+c=0⇒a+c=3......(1)and −a−2c=0......(2)on SOLVING:-c=−3 and a=6∴M=k g 3 V 6 d ∴ Mass ∝ sixth Power of Velocity Hope it helpsplzzz mark as brainliest ✌️ ✌️✌️✌️ |
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| 26. |
Plz answer the above question.. |
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Answer» tion: HI bro it's easy........ As we know, THE AREA UNDER V-T GRAPH GIVES THE MAGNITUDE OF DISPLACEMENT/ DISTANCE. Let's mark the first triangle in the graph as 1st. base = 4-0 = 4 units height = 2-0 = 2 units So, Area of 1st triangle = 1/2bh = 1/2×8 = 4units Similarly, Area of 2nd triangle in DOWNWARD graph will be equal to 1 unit. Now, we will find area of that square, i.e. side x side = 1 unit. Now simply add all areas...... 4+1+1 = 6units.THEREFORE YOUR ANSWER IS, DISPLACEMENT = 6 meters hope it helped you. pls mark it brainliest |
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| 27. |
A body of mass 5 kg has a velocity of 2 m/s .then kinetic energy will be |
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Answer» :Given -Mass = 5 kgSpeed = 2 m/sTo Find -Kinetic energy ?Solution -Kinetic Energy = ½mv²Now, Calculating Kinetic energy :⇒ ½*5*(2)²⇒ 5*2⇒ 10 JHence, Kinetic energy of the BODY is 10 J.Some ADDITIONAL Information -Energy possessed by a body DUE to change in position of SHAPE is called potential energy.Energy possessed by a body due to change in MOTION is called Kinetic energy.PE = mghKE = ½mv² |
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| 28. |
3600m can be expressed as best answer will be marked as brainlest |
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Answer» it can be EXPRESSES as 360000cm |
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| 29. |
What is Gauss's Law in a simple explanation to understand |
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Answer» Gauss's law STATES that the net FLUX of an electric field in a CLOSED surface is directly PROPORTIONAL to the enclosed electric charge. ... Yet another statement of Gauss's law states that the net flux of a given electric field through a given surface, divided by the enclosed charge should be equal to a constant.pls mark as the BRAINLIST |
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| 30. |
The refractive index of medium A is 1.7 and that of B is 1. 2. Find n^ba. Plzz answer i will mark u as brainlist...... Its urgent i really need this.... |
| Answer» IUM a/medium b=8/7/7/6=8/7×6/7=48/49=0.9(APPROX) ANSWER | |
| 31. |
A charge of 10 coulomb passes through a cross-section of a conductor in 20 second. What is the magnitude of current flowing through it? |
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Answer» Given : q=10 C t=5 s ∴ Electric CURRENT I= t q= 5 10 =2 AEXPLANATION: |
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| 32. |
Sen Soul 10. A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find (a) the focal length of mirror (b) position of image. Ans. (a) 22.5 cm, (b) 90 cm in front of mirror. ath Follo |
| Answer» SEE the ATTACHMENT EXPLANATION:MARK me as BRAINLIST | |
| 33. |
A charge q=1 microFarad is placed at point (1m,2m,4m).find the electric field at point p(0m,-4m,3m). **Please solve this question without using the formula of Coulombs law in vector form. And please calculate the electric field separately for x y and z axis one by one** |
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| 34. |
Find the rasistence |
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Answer» dhhfhdhxjsjsjsiididic |
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| 35. |
What are the two types of convex lens.......... |
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Answer» the TWO TYPES of convex LENS arebiconvex lensconcavo convex lensExplanation:hope it HELPS youplzz mark me as ur BRAINLIAST |
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| 36. |
Diagram of protozoa Write their role in brief Help me |
| Answer» BROO.....MARK me as BRAINLIEST BRO | |
| 38. |
The masses of scooter and bike are in the ratio 2:3 but both are moving with same speed of 108 km/hr. Compute the ratio of their kinetic energy |
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Answer» ke=1\2mv2Explanation:ke1\ke2=m1\m2m1\m2=2;3 |
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| 39. |
When engine pulls train how much work is done? |
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Answer» it depends on the force = MASS × acceleration PLS FOLLOW me and I will follow you back |
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| 40. |
Study the following graphs and analyze. Can these graphs represent one dimensional motion of a particle? Give reasons for your answer |
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| 41. |
6. An object 5 cm high is placed at a distance 60 cm in front of a concave mirror of focal length 10 cm. Find (i) the position and (ii) size, of the image. Ans. (i) 12 cm in front of the mirror, (ii) 1 cm |
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Answer» teHere is your ans:-Explanation:(i) Position of image is 12 cm in FRONT of mirror. (II) SIZE of image is -1 cm.SolutionHere we have :-● Height of object (h_0) = 5 cm.● Distance of object (u) = -60 cm.● Focal length (f) = -10 cm.We will use mirror FORMULA :-● 1/f = 1/v + 1/u⇒ 1/-10 = 1/v + 1/(-60)⇒ 1/-10 = 1/v - 1/60⇒ 1/v = 1/60 - 1/10⇒ 1/v = (1 - 6)/60⇒ 1/v = -5/60⇒ 1/v = -1/12⇒ -v = 12⇒ v = -12 cmSo, position of image is 12 cm in front of mirror.Now we will use magnification formula :-● m = h_i/h_o = -v/u⇒ h_i/5 = -(-12)/-60⇒ h_i/5 = 12/-60⇒ h_i/5 = 1/-5⇒ -5h_i = 5⇒ h_i = 5/-5⇒ h_i = -1 cmSo, size of image is -1 cm.I hope this will help you❤️❤️ |
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| 42. |
1). Give an example of a body which may appear to be moving for one person and stationary for the other. 2). What can we tell about motion from the above example. Plz give right answer its urgent. |
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Answer» a PERSON sitting in the moving car watching outsideExplanation:the MOTION is called RELATIVE motion because REST and motion are related to each other |
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| 43. |
a balloon which is ascending at the rate of 12 m per second is 30.4 m above the ground when a stone is dropped after what time the stone will reach the ground |
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Answer» 0= (12)^2–2gh( h is the HEIGHT the stone will RISE before start of FALL.) t = 12/10sec ( time to rise above 30.4m.). Total height to fall 30.4+7.2,=37.6 m.Explanation:here's the answer please FOLLOW me |
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| 44. |
Find tension 1 , tension 2 ,3,4, 5 in this question |
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Answer» Explanation:PLS FIND the ATTACHMENT where is T 5 IN THE QUESTION?? |
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| 45. |
What is force and low of motion?? |
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Answer» ’ is a vector quantity that can be described as a push or pull on an OBJECT.......Laws of motion are :- These laws are as follows:• Newton’s FIRST Law of Motion also known as Law of Inertia states that every object persists to stay in uniform motion in a straight line or in the state of rest unless an external force acts upon it.• Newton’s Second Law of Motion states that force is equal to the change in momentum PER change in time. For a constant mass, force equals mass times acceleration, i.e. F = m*a. Learn about the Acceleration in detail here.• Newton’s THIRD Law of Motion states that for every action there is an equal and opposite reaction. |
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| 46. |
Find the effective resistance between i} R( a-b)ii} R (a-c)iii} R (a-d) |
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Answer» bit of juggling of the question first i did the first part then i did the third part and then the second part. In the first part the effective resistance between A and B will be 11R/4 as the current will not go in C and D BRANCH it will directly go from A to B firstly all three central resistances are in series and their sum will be 3R then 3R will be in parallel with R then their sum will be 3R/4 and then all three i.e. R , 3R/4 , R will be in series and their sum will be 11R/4. Same is for the effective resistance between A and C . In the third part between A and D there are 4 resistances in which 2 of them are series and other 2 are also in series and their sum will be 2R and both these 2Rs are in parallel and their sum is R and all three resistances i.e. R,R,R are in series and their sum is 3R .The SOLUTION is in the attachment. |
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| 47. |
I'll mark the blainliest, solve this and give step by step explanation |
| Answer» SEE the attachmentExplanation:MARK me BRAIN LIST | |
| 48. |
4. A body of mass m is moving in a circle of radius r with angular velocity ω. Find the expression for the centripetal force f acting on it using method of dimensions. Need step by step solution . |
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| 49. |
Define principal focus |
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Answer» geometrical optics, a focus, ALSO CALLED an image point, is the point where light rays originating from a point on the object converge. ALTHOUGH the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle... Pls follow me and have a nice day.. ❤️ |
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