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. |
Keyword of force at distance |
| Answer» CONTACT forceExplanation: | |
| 3. |
What type of motion is shown in the above v-t graph? |
| Answer» ATING MOTION SHOWN in the GIVEN GRAPH. | |
| 4. |
Obtain an expression for the terminal velocity of the sphere moving through a viscous medium |
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Answer» tion:STATEMENT: # The MAXIMUM constant velocity acquired by a body while falling through a viscous medium is called its TERMINAL Velocity. ...DERIVATION: Expression for terminal velocity,V = Vt. Density of a SPHERE = ρ ...Viscous FORCE = mg. 6πηrv = mg. ...V = 2r² ( ρ - σ ) g / 9η Hope it helps U. |
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| 5. |
Indetify the relation Bulb :lighting effect. electric iron? one word question |
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Answer» Physics > Electricity > Heating EFFECTS of Electric Current and Its ApplicationsElectricityHeating Effects of Electric Current and Its ApplicationsBefore we go to school or to attend any function, we ensure that our clothes are crisp and not crimped. And for this, we use an iron to straighten out those clothes. Why do we only use an iron? What’s the mechanism behind the working of an iron? And why is an iron always hot? WELL, this iron is the most basic example of heating effects of electric current in our everyday life. There are many such other devices that WORK on the heating effects of electric current. Let us study them below. What are the heating effects of the electric current?When a current flows through a conductor, heat energy generates in the conductor. The heating effects of electric current depend on three factors:The resistance of the conductor. A HIGHER resistance produces more heat.The time for which the current flows. The longer the time the amount of heat production is high.Higher the current the amount of heat generation is also large.Hence the heating effect produced by an electric current, I through a conductor of resistance, R for a time, t is given by H = I2Rt. This equation is the Joule’s equation of electrical heating.Browse more Topics under ElectricityElectric Current and Circuit DiagramsElectric Potential and Potential DifferenceOhm’s Law and ResistanceJoule’s law states the amount of heat production in a conductor is :Directly PROPORTIONAL to the square of electric current flowing through it.Is directly proportional to the resistance of the conductor.Directly proportional to the time for which electric current flows through the conductor. |
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| 6. |
what will be the correct and the immediate trough of progressive transverse wave travelling at a speed of 5040 metres per second and having a frequency of 315 hz |
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| 7. |
Indetify the relation Bulb :lighting effect. electric iron? |
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Answer» When ELECTRIC current passes through objects such as the filament of an electric bulb, the filament glows and produces LIGHT. Here, electrical energy is converted into light energy. This is the lighting EFFECT of electric current. |
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| 8. |
Two methods incraseing diflasion of galvanometerin Faraday's expriment? |
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Answer» chael Faraday made his discovery of electromagnetic INDUCTION in 1831, he hypothesized that a changing magnetic field is NECESSARY to induce a current in a nearby circuit. To TEST his hypothesis he made a coil by wrapping a PAPER cylinder with wire. |
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| 9. |
Write the rules of sign convention? |
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Answer» "HERE IS YOUR ANSWER"Explanation:Rules of SIGN convention :1) All distances should be measured from the pole.2) The distance measured in the direction of incident, light to be taken positive and measured in the opposite direction of incident light to be taken negative.3) Height of objective and heights of IMAGE are positive if measured upward from the AXIS and negative if measured downward4) For a concave mirror 'f and 'R' are negative and for a CONVEX mirror these are positive. |
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| 10. |
What is the unit of velocity? |
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Answer» nd velocity are both measured using the same units. The SI UNIT of distance and DISPLACEMENT is the METER. The SI unit of time is the second. The SI unit of speed and velocity is the RATIO of two — the meter per second .mark me as brainliest |
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| 11. |
List the material required for making solar cooket |
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Answer» What You NEED: Cardboard pizza box (the kind delivered pizza comes in) Box KNIFE or SCISSORS. Aluminum foil. Clear tape. Plastic wrap (a heavy-duty or freezer zip lock bag will also WORK) Black construction PAPER. Newspapers. Ruler or wooden spoon.Explanation: |
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| 12. |
Kisi bhai n MET JRF k physics academy k note or sari online classes cahhiye to comment kre. |
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Answer» I WANTED it...................... |
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| 13. |
In order to shift a body of mass m from a circular orbit of radius 3R to a higher radius 5R around theearth, the work done is :- |
| Answer» WORK done is shifting a body from an ORBIT of radius 3R to 5R is equal to CHANGE in potential energy of the body.Potential energy =r−GMmwhere M is mass of the EARTH m is mass of satellite r is radius of orbitW= Final potential energy − Initial potential energy W=5R−GMm−(3R−GMm) =RGMm(31−51)=15R2GMmAnswer ByToppr | |
| 14. |
Name the type of motion in which a body has a constant speed but not constant velocity. with better explanation plz ..☺ |
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Answer» The CIRCULAR motion is the TYPE of the motion of the body which has constant speed but not constant velocity because when a body moves in circular motion, the speed of the body remain constant all time of the motion but the direction changes continuouslyExplanation:plz MARK me as a BRAIN LIST |
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| 15. |
a physical quantity x is given by x=(a2 b3) /(c√d) if the percentage errors of measurement in a, b, c, and d are 4%,2%,3%,and 1% respectively, then calculate the percentage error in the calculation of x |
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Answer» iven x=c1/2d1/2a3b2On taking log and differentiating, we getxΔx =3aΔa +2bΔb +(21)cΔc +(21)dΔd ⇒ Percentage error in x=3(1)+2(3)+21(4)+21(2)=12% |
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| 16. |
AC voltage source changes its polarity-------- in one period? Once/Twice/Thrice/None |
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Answer» OnceExplanation:AC voltage is a sinusoidal SIGNAL. The MAGNITUDE of an AC signal changes continuously. ONE period of AC signal includes 360°. During one period of the signal, the AC voltage changes from positive (0° to 180°) to NEGATIVE (180° to 360°) just once. |
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| 17. |
Indetify the relation Bulb :lighting effect. electric iro ? |
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Answer» In the above circuit one END of the bulb is CONNECTED to the battery and another end to the SAFETY pin.But the other end of the battery is not connected to the safety pin. Therefore there will be no flow of current as the switch is in “OFF” position.This SHOWS the circuit is not complete. |
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| 18. |
14. A flat dielectric disc of radius R carries an excess charge on its surface. Thesurface charge density is o. "The discrotates about an axis perpendicular toits plane passing through the centrewith angular velocity w. Find themagnitude of the torque on the disc ifit is placed in a uniform magnetic fieldwhose strength is B which is directedperpendicular to the axis of rotation1(a) ΞσωπBR4.(b) 50σωπBR(c) -O0ABR4.(a)? ownBR4 |
| Answer» CLASS EXPLANATION:class LESSON no SEND | |
| 19. |
Name the material which is the best condector of electricity? |
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Answer» • It is the MATERIAL which is the BEST CONDUCTOR of ELECTRICITY . |
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| 20. |
in a house two 60W electric bulbs are lighted for 4 hrs and three 100W bulbs for5hrs every day. Calculate the electric energy consumed in 30 days? |
| Answer» TOTAL electrical energy CONSUMED in 30 DAYS is 59.5units | |
| 21. |
For large distance, Potential due to a point dipole varies with the distance 'r' as * |
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| 22. |
A voltmeter has resistance of G ohm and range of v volt. The value of resistance used in series to convert it into a voltmeter of range nV volt is * |
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| 23. |
Two vectors P and Q have magnitude 3 units and 4 units respectively. R is the resultant of P and O. Find the magnitude and direction of R when the angle between between and ő is 30°Ans. 6.76 units, 17° 12' |
| Answer» HELLO my fellow FRIEND reffer the ATTACHEMENT, hope it helps. | |
| 24. |
What is the density of wat at 4°c |
| Answer» EXPLANATION:what is the DENSITY of WAT at 4°c | |
| 25. |
Two positive point charges are placed a distance apart in vacuum. Draw the lines of force and equipotential surfaces for the resulting electric field. |
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Answer» s will HELP YOUMARK me as BRAINLIEST DEAR |
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| 26. |
2 masses of mass m each are rigidly attached to two rigid rods as shown and this setup perforfms UCM, then A)both the masses have same angular velocity B)if the rods are mass less, both the masses will experience same centrifugal force C)both masses will have same speed D)the velocity of outward mass will be double that of inward force |
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Answer» Given,Both objects have mass =MThe SEPARATION between them =LBoth objects has equal mass, canter of mass will be at the axis. Distance of object from center of mass d= 2L MOMENT of Inertia = Mass X (Distance from axis)2Total moment of Inertia = Moment of Inertia of object 1 + Moment of Inertia of object 1I=Md 2 +Md 2 I=M( 2L ) 2 +M( 2L ) 2 I= 2ML 2 Moment of Inertia of system I= 2ML 2 Pls make me the brainlest.pls subscribe my channel NISHKA Shah which has 16 SUBSCRIBERS and is a new channel |
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| 27. |
6 13. The vertical component of Earth'smagnetic field at a place is equal to thehorizontal component. What is thevalue of angle of dip at this place?(a) 30°(b) 45°(c) 60°(d) 90° |
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Answer» 45 degreesExplanation:GIVEN VERTICAL component=horizontal compenenttan A= Vertical Comp÷ Horizontal COMPAS they both are equalTan A= 1Tan A=Tan 45A =45Hope this HELPS You!!! |
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| 28. |
What do you mean by humanism? |
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Answer» a rationalist OUTLOOK or system of thought ATTACHING PRIME importance to human RATHER than divine or SUPERNATURAL matters. |
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| 29. |
From a top of the tower 40 m high, a body is thrown vertically upwards with a velocity of 10 m per second. How much time does the body takes to reach the ground. What is its velocity just before it hits the ground. (g=10 m per second) |
| Answer» HAY MATE UR ANSWER IS HERE HEIGHT OR DISTANCE =40M OR S=40MU=10V=0 V IS 0 BECOZ AFTER GOING UPWARDS THE BODY COMES DOWN AT REST NOW FIND THE ACCELERATION THE FORMULA IS V*2-U*2=2AS0-100=2×A×40-100= 80A -100/80=AA=-5/4NOW FIND TIME BY USING FORMULA A=V-U/T-5/4=0-10/T-5/4T=-10T= 8M^S*-PLZ FOLLOW ME PLZ MARK ME AS THE BRAINIEST | |
| 30. |
Equal volumes of iron and rubber have__________ masses. |
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| 31. |
2 ohm and 4 ohm resistors are connected in parallel. 12 V potential difference is applied. Find the current in the circuit. |
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Answer» Given ,2Ω and 4Ω resistances are connected in parallel.12 V POTENTIAL difference is applied to those resistances .We need to find the current in the CIRCUIT .When resistances are connected in parallel . Then the resultant resistance is given by ,\bf R_{parallel.Eq}=\dfrac{1}{R_1}+\dfrac{1}{R_2}+\dfrac{1}{R_3}+.....R parallel.Eq = R 1 1 + R 2 1 + R 3 1 +.....Given that ,\bf R_1=2\;\OMEGA\ ,\;R_2=4\;\OmegaR 1 =2Ω ,R 2 =4Ω$$\begin{lgathered}\implies \bf \dfrac{1}{R_{P.Eq}}=\dfrac{1}{R_1}+\dfrac{1}{R_2}\\\\\implies \bf \dfrac{1}{R_{P.Eq}}=\dfrac{1}{2}+\dfrac{1}{4}\\\\\implies \bf R_{P.Eq}=\dfrac{4*2}{4+2}\\\\\implies \bf R_{P.Eq}=\dfrac{8}{6}\\\\\implies \bf R_{P.Eq}=\frac{4}{3}\;\Omega\end{lgathered}$$So we have ,Resistance , R = 4/3 Ω ,Potential Difference , V = 12 VCurrent , I = ? ANow use Ohm's law to find the current .$$\begin{lgathered}\implies \bf V=IR\\\implies \bf 12=I*\dfrac{4}{3}\\\\\implies \bf I=9\;AMPERES\end{lgathered}$$So current in circuit is 9 Amperes |
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| 32. |
all that apply. What are the main reasons why excess weight affects physical fitness? The heart has to pump harder. The person sweats more. The person does not see results from the exercise. It is more difficult to exercise. A heavy person gets more tired during exercise. |
| Answer» HEY MATE here is the BEST ANSWER | |
| 33. |
400 km =________ megameter |
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Answer» 0.4 megametreExplanation:BRAINLIEST PLEASE!!!! |
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| 34. |
V=π/8 pr4/ni determine the dimensions of n |
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Answer» is the pressure DIFFERENCE between the TWO ends and n is COEFFICIENT of Viscosity of the LIQUID having dimensional formula check whether the equation is dimensionally correct. |
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| 35. |
6000 nanometers =________ m |
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Answer» 0.000006 mExplanation:6000 NM = 6 × 10³ nm = 6 × 10³ × 10^(-9) m= 6 × 10^(-6) m = 0.000006 m |
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| 36. |
Derive the formula for density which depends on mass and volume |
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Answer» To find MASS from density, you NEED the equation Density= Mass ÷ Volume or D= M÷V. The PROPER SI units for density are g/cubic cm (grams per cubic CENTIMETERS), alternately expressed as kg/cubic m (kilograms per cubic meters) |
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| 37. |
a swing has a time period of 1.4 sec . The number of ossicilations made by it within 1 min 24 sec will be |
| Answer» BER of OSCILLATIONS will be 117.4 | |
| 38. |
Focal length, object distance,magnification |
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Answer» ength is half of the CENTRE of the curvature of mirror or lens.OBJECT distance is the distance of object from the mirror or lens.Magnification is the the action of being magnified.In CASE of mirror, it is -v/u.In case of lens, it is v/u.hope it helps u...plz mark as brainliest... |
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| 39. |
9. Coefficient of linear expansion of brass is19 x 10-6°C-1. If the area of a circular brass disc at 0°Cis 25 cm2, then at 80°C its area will beB 25.076 cm2A 25.038 cm2© 25.114 cm2D 25.38 cm2 |
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Answer» furjurururu hukguftujfkd |
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| 40. |
_____________ is reverse process of evoporation....... |
| Answer» ATION is REVERSE PROCESS of EVOPORATION....... | |
| 41. |
A current of 4 A flows through a nichrome wire under a P.D. of 4V. If the length of the nichrome wire is 1 m andits area of cross section is 1 mm², then its resistivity is(a) 2 x 10-6 m (b) 2 x 10-72m(C) 10-62 m(d) 5 x 10-722-m |
| Answer» RESISTANCE of the WIRE R=IV∴ R=42=0.5ACross-section AREA of wire A=1mm 2=10−6m2Length of wire L=1mThus RESISTIVITY of wire ρ=LRA∴ ρ=10.5×10−6=5×10−7Ωm | |
| 42. |
Rajdhani express moves at a speed of 180 km/h .how long it take to cover 18 km? |
| Answer» 6 minsExplanation:t=d/st = 18/180t = 1/10 of an hourt = 1/10 of an a hourt = 1/10 * 60T = 6 MINS | |
| 43. |
Particle moves along x- axis from x= 0 to x= 4 under the influence of force F= ( 4x^2-7x+5) N. Calculate the work done. |
| Answer» WORK DONE by the FORCE is 61 JOULES | |
| 44. |
How does magnetic field produced around a straight current carrying conductor change as (1) distance from conductor is decreased |
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Answer» Increases when the distance from the CONDUCTOR is DECREASED. It is observed that as we move closer and closer to the current CARRYING conductor, the magnetic field LINES get more and more concentrated indicating a higher strength of magnetic field near it.Explanation: |
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| 45. |
Fluids are the substances which_____________friction |
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Answer» reducesExplanation:FLUIDS are the SUBSTANCE which REDUCES the FRICTION. |
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| 46. |
Microgrid vs conventional grid |
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Answer» A microgrid is essentially a local energy grid with INDEPENDENT control CAPABILITY, which means it can disconnect or “island” from the traditional main grid and operate AUTONOMOUSLY by using local energy generation in case of a POWER outage................................ |
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| 47. |
calculate the force of a moving ball 15 metre per second in 3 seconds starting from rest. the mass of a ball is 200 g. |
| Answer» 1 NewtonExplanation:MASS in kg=200/1000=0.2kgF= CHANGE in momentum/time = mv/t= 0.2*15/3= 1 NEWTON | |
| 48. |
an object is thrown vertically upward direction. calculate (a) the time to reach maximum height (b) the maximum height |
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Answer» An object is thrown vertically UPWARD DIRECTION. calculate (a) the TIME to REACH MAXIMUM height (b) the maximum height - 22604611. |
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