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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.
| 3051. |
Two bulbs of the following ratings :- (a) 40 W, 220 V (b) 20 W, 110 V. The ratio of the resistances will beImmersive Reader.1:22:11:11:3 |
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Answer» THIK it's 1:2 |
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| 3052. |
On what factor does the parallel plate capacitor depends |
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Answer» Answer: The value of CAPACITANCE of a CAPACITOR depends on THREE factors: • The area of the plates. The distance between the plates. The DIELECTRIC constant of the material between the plates. Explanation: hope it helps u mate mark as brainlist |
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| 3053. |
What is convection?? |
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Answer» Answer: Convection is the process in which heat moves through a gas or a LIQUID as the hotter part rises and the cooler HEAVIER part sinks.
Hope this answer HELPS you. |
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| 3054. |
56. If poisson's ratio equal to 0.4 for the materialcylindrical wire, then find the percentage changeTRXWX(4)3WRR²x(3)TER?3.(2) 14 kg(4) 12 kgto of 0.5. If a uniform roda longitudinal strain ofe in volume of the rod is(2) 20%90%volume of the same wire in which longitudinaleis 2x103 on applying tensile stress,(1) 0.04%(3) 0.02%(2) 0.08%(4) 4%4.acceleration 19.6 mly in horizontal directhe amount of water split out is(1) 250 kg(2) 500 kg(3) 750 kg(4) 900 kg8 identical drops of the same radius 2through air with steady velocity 5 omis,drops coalesco the terminal velocity wou(1) 10 m/s(2) 0.1 m/s(3) 20 cm/s(4) 40 cm/sBernoulli's principle is based on(1) Conservation of mass(2) Conservation of Energy(3) Conservation of momentum(4) Conservation of VolumeAn open U-tube contains mercury. Wof water is poured into one of the armshow high does the mercury rise in thfrom its initial level ? (Density of13.6 g/cm)(1) 0.56 cm(2) 1.35modulus Y, coefficient ofrea of cross-section A isagnitude of temperaturete the thermal stresslength is L and it is freezontal surface,(2) YAOAT57. Two rods A and B of radii in ratio 1:2 and forratio 2 : 5, are placed between rigid supportsno scope for expansion. The material of bothis same. Now if both the rods are heatedproduce the same temperature rise, then ther.of thermal stress developed in A and B is5.(1) 1:1(2) 1:2(4) Zero(3) 1:4(4) 1:858. Calculate the maximum length of a uniformwhich can be hanged from ceiling, padensitymaterial of wire, g-acceleration due to gravityo=breaking stress for the material of wire.6.(3) 0.41 cm(4) 2.32A closed compartment containgingwith some acceleration in horizontStress |
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Answer» Answer: 57----- The LENGTHS and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively ; If the TEMPERATURE difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per SECOND through them will be in the RATIO: Medium share Share Answer Correct option is C 8 : 9 Q= d kAδ(T) Q 2 Q 1 = kπ3x 2 δ(T)y kπ2x 2 δ(T)2y Q 2 Q 1 = 9 8
58-------------- If ρ is the density of the material of a wire and σ is the breaking stress, the greatest length of the wire that can hang freely without breaking is? Easy share Share Answer Correct option is A σ/ρg Stress = weight/area =Alρg/A=lρg⇒σ=lρg ∴l=σ/ρg |
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| 3055. |
Please please be fast answer right don't span |
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Answer» Answer: 5N to the right Explanation: NET FORCE = difference of forces in opposite directions or net force = -7 + 12 = 5N |
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| 3056. |
A material has poisson's ratio of 0.5. If a uniform rodof same material suffers a longitudinal strain of2x10-3, then the % change in volume of the rod is(1) 2%(2) 20% |
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Answer» great person than mark it on my calendar for me I will be MARKED as a yes it's still available and if so what TIME would be best for exam by the time I get home I will ANSWER your QUESTIONS I have to go to I will answer your question I have to go I'm go to FB and PRESS release to be at the loo you have a good day and time I r |
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| 3057. |
Write the SI unit to measure distance and displacement. |
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Answer» Answer: METER... |
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| 3058. |
Fill in the blanks . physics (i) in inelastic collision .......are corved |
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Answer» Answer: May your family relatives and companions maybe happy and safe from the Pandamic situation and COVID-19 In an inelastic collision between TWO objects An inelastic collision is one in which the internal KINETIC energy changes (it is not conserved). This lack of conservation MEANS that the forces between colliding objects may remove or add internal kinetic energy. Work done by internal forces may change the forms of energy WITHIN a system If find this helpful please FOLLOW me. thanks and Vote.. And Mark as BRAINLEIST... |
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| 3059. |
Circa 102turnsof zodius g.42cm havingCammies currentFindfield Induction at it's centre.magnetic field |
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Answer» Answer: |
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| 3060. |
1. Which quantity is constant in series combination?(A) Q(B) I(C) W(D) R |
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Answer» B) I (CURRENT) Explanation: because in series combination current always flow in same manner it does not change. HOPE you understand. |
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| 3061. |
What is apparent weight of a body in a lift which is freely falling |
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Answer» Explanation: In short, if the MAN is at rest or if he is MOVING up or down with uniform speed, a force equal to his weight mg acts upward and his apparent weight is ALSO mg. If he falls FREELY under gravity, there is no upward force and his apparent weight is 0 |
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| 3062. |
At the centreHow the strength of the magnetic fielddepend on-circular ofa wireradiusthe coilnumber of turnsofin the coil |
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Answer» I don't KNOW the answer Explanation: I don't know the answer |
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| 3063. |
Oo Determine that the vector which when addedto lusoltantof à - 37 - 5; + 7E andB = 2 ņ +47 - 3a unit vectorB.टाalongTheretton gives |
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Answer» bsbsjsjkdksjdndkfeooekeker |
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| 3064. |
The acceleration produced by a force of 5 N acting in a mass of 20 kg in m/S 2 is |
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Answer» Given,
To Find:-Acceleration Formula used:- F = ma (Newtons SECOND law) Calculations:- F = ma substituting the given values a = F/m a = 5/20 a = 1/4 a=0.2m/s^2 Explore More:- Acceleration:- Units:-m/s^2
a=v-u/t a= acceleration v=Final velocity u=initial velocity t= time |
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| 3065. |
Iii) Electrical resistivity of a given metallic wire depends upon(a)its length (b)itsthickness (c) its shape(d) nature of thematerial |
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Answer» ELECTRICAL resistivity of a GIVEN metallic wire = (a) Nature of the material. |
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| 3066. |
Which quantity is constant in series combination? (A) Q (B) I (C) W (D) R pls answer fast |
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Answer» Answer: I(current) is your answer please mark me as the BRAINLIEST |
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| 3067. |
17.v110VCU LO TULUS LIC nucun uguin.10. A beaker 20 cm high is half filled with an oil ofrefractive index 1.40 and the upper half filled withwater of refractive index 1.33. What is the apparentdepth of the beaker as observed normally?Ans 14 66 cm!11!Ataylof light fdl1b|nothaliyon the face a glass prismsa 53 PE ***An 1.5). Find the angle of the prism, if the ray justWO) NON fails to emerge IVOS LZ9CVUVIN12. A substance has a critical angle of 45 for yellow light.What is therefractive in sex of the substanceFetisimbaliyee atedá el-18. |
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Answer» PAT anhhdhdhdhhdjdjxjjxjdjxjd |
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| 3068. |
A marble launcher shoots a marble horizontally from the height of 0.2 m above a horizontalfloor. The marble lands on the floor 5 m away from the launcher. How long did the marble stay in the air?A. 0.1 s B. 0.2 s C. 0.3 s D. 0.4 s |
Answer» Given:A marble launcher shoots a marble horizontally from the HEIGHT of 0.2 m above a horizontal FLOOR. The marble lands on the floor 5 m away from the launcher. To FIND:Time of flight? Calculation:Let horizontal velocity of projection be v: Now, range of flight will be : Now, put value of v : So, time of flight is 0.2 sec. |
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| 3069. |
How to measure centripetal acceleration if mass radious and rotation is given?? |
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Answer» Explanation: We know from kinematics that acceleration is a CHANGE in velocity, either in its magnitude or in its DIRECTION, or both. In uniform circular motion, the direction of the velocity changes constantly, so there is always an associated acceleration, even though the magnitude of the velocity might be constant. You experience this acceleration yourself when you turn a corner in your car. (If you hold the wheel steady during a turn and move at constant speed, you are in uniform circular motion.) What you NOTICE is a sideways acceleration because you and the car are changing direction. The sharper the curve and the greater your speed, the more noticeable this acceleration will become. In this section we examine the direction and magnitude of that acceleration. Figure 1 shows an object moving in a circular path at constant speed. The direction of the instantaneous velocity is shown at two points along the path. Acceleration is in the direction of the change in velocity, which points directly toward the center of rotation (the center of the circular path). This pointing is shown with the vector diagram in the figure. We call the acceleration of an object moving in uniform circular motion (resulting from a net external force) the centripetal acceleration(ac); centripetal means “toward the center” or “center seeking.”  The direction of centripetal acceleration is toward the center of curvature, but what is its magnitude? Note that the triangle FORMED by the velocity vectors and the one formed by the radii r and Δs are similar. Both the triangles ABC and PQR are isosceles triangles (two equal sides). The two equal sides of the velocity vector triangle are the speeds v1 = v2 = v. USING the properties of two similar triangles, we obtain Δvv=ΔsrΔvv=Δsr. Acceleration is ΔvΔtΔvΔt, and so we first solve this expression for Δv: Δv=vrΔsΔv=vrΔs. Then we divide this by Δt, yielding ΔvΔt=vr×ΔsΔtΔvΔt=vr×ΔsΔt. Finally, noting that ΔvΔt=acΔvΔt=ac and that ΔsΔt=vΔsΔt=v, the linear or tangential speed, we see that the magnitude of the centripetal acceleration is ac=v2rac=v2r, which is the acceleration of an object in a circle of radius r at a speed v. So, centripetal acceleration is greater at high speeds and in sharp curves (smaller radius), as you have noticed when driving a car. But it is a bit surprising that ac is proportional to speed squared, implying, for example, that it is four times as hard to take a curve at 100 km/h than at 50 km/h. A sharp corner has a small radius, so that ac is greater for tighter turns, as you have probably noticed. It is also useful to express ac in terms of angular velocity. Substituting v = rω into the above expression, we find a |
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| 3070. |
What force will produce the pressure of 50,000 pa on an area of 0.20 m2 |
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Answer» Answer: 50000* |
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| 3071. |
Is used to make non stick pans and dash are forms of Protozoa fill in the blanks |
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Answer» hiiiii. please MARK me as BRANILIEST. |
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| 3072. |
An object is at a distance of 10 cm from a mirror and the image of the object is at a distance of 30 cm from the mirror on the same side as the object. Then the nature of the mirror and focal length is.Convex, 15 cmConcave, -15 cmConcave, -7.5 cmConvex, 7.5 cm |
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| 3073. |
Write any one method to induced current in a coil? |
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Answer» |
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| 3074. |
A door will not move if we apply force in the direction of arm length. why? |
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Answer» Explanation: The point is that because the door is ATTACHED a hinge, the ONLY force you can exert on the door is a ROTATIVE force, which is measured in torque. Torque is proportional to the distance from the rotation axis to the point where the force is exerted. So if you push linearly (perpendicular to the door) with the same force at the end of the door (distance to hinge = 1M), and then right next to the hinge (distance to hinge = 0.05m), the push near the hinge will generate FAR less torque, SINCE your original force will be multiplied by 0.05, ie. only 5% of your linear force is rotating the door. mark me as brainleast |
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| 3075. |
two object are thrown up at angle of 45° and 60° respectively with horizontal. If both object same vertical height thn what will be the ratio of velocity with which the object are thrown. |
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| 3076. |
calculate athe electric current density of uniform wire connected to a battery of emf 3.5V and negligible internal resistance.The resistance of the wire is 2.0 ohm and its area of coss section is 0.70 x10^-6 m^2 |
Answer» given,EMF of battery = 3.5 vResistance of the wire = 2.0 ohmsArea of cross section = 0.70*10^-6m^2Current,I = V/R ==>3.5/2 ==>1.75Current DENSITY = J = I/A = 1.75/0.70*10^-6m^2i.e........... J = 2.5*10^6.hope thishelps uh dear ;)pls MARK as brainliest.......... |
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| 3078. |
Train in hundred metre long and 1 poinis moving with a uniformvelocity of 54 kilometre perhour. The time taken by it tocross the bridge 150 metrelong isO 10secO 50/3 secO 24secNone of these |
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Answer» Answer: 50 /3 sec as 100M LONG train what time it will take to go 150 m of bridge so we have to first subb track 100-150 therefore we will GET 50 so we will CHOOSE 50/ 3 seconds |
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| 3079. |
Give two causes of noise pollution from the homes |
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Answer» Explanation: SLEEP and BEHAVIOURAL DISORDERS ....... |
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| 3081. |
Please please please explain your answer i will mark it as brainliest answer |
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Answer» Answer: u⁴/g is the answer for your QUESTION dear friend and MARK me as BRAINLIST |
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| 3082. |
4. তিনটি একই রকম ধারকের শ্রেণি সমবায়ের তুল্য ধারকত্ব 2gF(i) সমান্তরাল সমবায়ে ধারকগুলির তুল্য ধারকত্ব নির্ণয় করাে।(ii) উভয়ক্ষেত্রে একই তড়িৎ-উৎসের সঙ্গে যুক্ত করলে দুটি ব্যবস্থায় সঞ্ছিতশক্তির অনুপাত নির্ণয় করাে। |
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| 3083. |
On the circular path, at any point velocity is in the direction of ________ drawn at the point.(1) any line (2) curve (3) tangent (4) none of these |
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Answer»
Its direction of velocity at every POINT during its MOTION will be along the tangent as shown in the figure. If the object is represented by TWO points on the circumference of a circle (as in FIG.) then its direction of velocity is V1 and V2 RESPECTIVELY.
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| 3084. |
state the various measures which can be taken to control or reduce noise pollution in our surroundings |
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Answer» Explanation: : (1) CONTROL at Receiver's End (2) Suppression of Noise at Source (3) Acoustic ZONING (4) Sound INSULATION at Construction STAGES (5) Planting of Trees |
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| 3085. |
A bullet is fired horizontallyfrom a gun at a speed of 1500metre per second towards thetarget situated at a distance of150 metre. At how muchdistance below the target, thebullet will strike? |
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Answer» Answer: |
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| 3086. |
Do aksansah rekha ki apsi duri kitni hoti hai |
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Answer» अक्षांश रेखाएँ काल्पनिक रेखाएँ है, इनकी संख्या अनन्त है। एक अंश (डिग्री) के अंतराल पर कल्पित किये जाने पर अक्षांश रेखाओं की कुल संख्या = ९० + ९० + १ = १८१ और यदि दोनों ध्रुवों को रेखा न माना जाय क्योंकि ये बिंदु हैं, तो 179 बतायी जाती है। |
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| 3087. |
A car weighing 1400 kg moving with a velocity of 72 km/h retards uniformly coming to rest in 20 seconds Find i)initial momentum of car ii)final momentum of car iii)rate of change of momentum . Please solve this properly 9th classs |
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Answer» I HOPE it will benefit you buddy please follow me or LIKE my answer at LEAST .... |
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| 3088. |
Kise wasto ka tap 40° ho to faranhite schaal pa uska tap Kitna Hoga? |
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Answer» Answer: 40°C is EQUAL to 104°F Explanation: If it is HELPFUL PLS MARK me as the BRAINLIEST |
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| 3089. |
Two bodies A and B of masses m and 3m are in motion with velocities v and 2v respectively compare their i) inertia ii)their momentum. |
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Answer» SIMPLE answer TEKE it easy Explanation: answer from GOOGLE |
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| 3090. |
What does the positive and the negative sign of the acceleration indicate? |
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Answer» Explanation: GENERALLY, Acceleration is DEFINED as the rate of change of VELOCITY. When the rate of change of velocity increases, the acceleration is POSITIVE and hence positive sign. When the rate of change of velocity DECREASES, retardation is taking place hence negative acceleration and so the negative sign. |
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| 3091. |
a)Space shuttles are provided with heat shields as they may start burning due to the heat produced by friction. Name the friction experienced by the space shuttles. |
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| 3092. |
What is the value of acceleration a when v |
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Answer» Explanation: if FINAL velocity is LESS than initial velocity, the value of acceleration is negative or we can SAY that it become DEACCELERATION. |
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| 3093. |
17. Electrics flux is proportional |
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Answer» Electric flux is proportional to the number of electric field LINES going through a virtual surface. ... For a non-uniform electric field, the electric flux dΦE through a small surface AREA dS is given by dΦE=E⋅dS d Φ E = E ⋅ d S (the electric field, E, multiplied by the component of area perpendicular to the field). |
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| 3094. |
What isneutralization reaction ? give two examples |
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Answer» Answer: a neutralization is a type of double replacement reaction. A salt is the PRODUCT of an acid-base reaction and is a much broader term then COMMON table salt as shown in the first reaction. The following are some EXAMPLES of neutralization reactions to form salts. hope help u MATE ❤ |
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| 3095. |
Explain how noice pollution or excessive loud noise is harmful to human beings |
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Answer» Answer: NOISE may permanently DAMAGE hearing. A sudden loud noise can CAUSE severe damage to the eardrum. Noise increases the chances of occurrence of diseases such as HEADACHE, blood pressure, heart failure, etc. Noise leads to increased heart beat, constriction of blood VESSELS and dilation of pupil. |
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| 3096. |
What will be acceleration if a car changes its velocity from 10 m/s to 6 m/s in 2 seconds? |
Answer» Answer:given DATA: u=10 m/s v=6 m/s t=2 s to CALCULATE: acceleration,a=? formula: calculation: here, negative sign represents decreasing acceleration. your answer is -2 therefore, change in acceleration of car changing VELOCITY of car from 10m/s to 6m/s in 2S is 2m/s² hope it helps to you☺️ |
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| 3097. |
त्वरण को परिभाषित कर उसकी इकाई (S.I.) एवं विमीय सूत्र लिखें। |
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Answer» Answer: Acceleration is defined as change in velocity RATE of any OBJECT DIMENSION of acceleration is L/T |
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| 3098. |
2945944279546414+ 17 + 6PrepertyF 014+6) + 1720 +/7V10037390046002+225)93770363) +208 @ (1962/1989 169531667)1200 208= 14081002x166*35(4 425 4 166100 Y166166002 x 1768 x 5,0# (@X50 x 1769LOU X 1764176%0D17910 oo842917 12561871851x29)1000 * 2916 62 54 279 716EGG 5X/62423910.00 42792790,00029/00010Gego375019,00 |
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Answer» IYS not UNDERSTANDABLE to me..... |
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| 3100. |
किसी अर्धचालक का ताप बढ़ाने पर उसकी चालकताजाती है। |
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Answer» when we HEAT SEMICONDUCTOR then his CONDUCTIVITY incresed |
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