Explore topic-wise InterviewSolutions in Current Affairs.

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.

Identify the wrong statement. (a) Eddy currents are produced in a steady magnetic field. (b) Eddy currents can be minimized by using laminated core. (c) Induction furnace uses eddy current to produce heat. (d) Eddy current can be used to produce braking force in moving trains.

Answer»

y currents are PRODUCED in a steady magnetic FIELD. => Wrong Statement.First of all , let's learn a few facts about Eddy currents.Eddy CURRENT is formed in a conductor is moving in a magnetic field for the magnetic field around the conductor is variable.Eddy currents are looped currents produced in planes perpendicular to the direction of the magnetic field intensity.There are various applications of Eddy current such as in braking system of train.Eddy currents are generated in the metallic wheels of a train when exposed to a magnetic field such that this INTERACTION can help in slowing down the train.Eddy currents are are usually dissipative with loss of energy and hence can be reduced by using laminated cores.So, the incorrect statement:Eddy currents are produced in a steady magnetic field. (error in "steady") HOPE It Helps.

2.

In the given figure current from A to B in the straight wire is decreasing. The direction of induced current in the loop is A (a) clockwise (b) anticlockwise (c) changing (d) nothing can be said

Answer»

In the given FIGURE CURRENT from A to B in the STRAIGHT wire is decreasing. The DIRECTION of induced current in the loop is A anticlockwise

3.

A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will (a) increase (b) decrease (c) remain same (d) first increase then decrease

Answer»

A SOLENOID is connected to a battery so that a STEADY current flows through it. If an iron core is INSERTED into the solenoid, the current will DECREASE...

4.

Higher the mass of an object, higher is it-..................

Answer» HIGHER the MASS of an OBJECT, higher it's GRAVITATIONAL FIELD
5.

Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in (a) P increases while in Q decreases (b) Q increases while in P decreases (c) both P and Q increases (d) both P and Q decreases

Answer» TWO identical coaxial COILS P and Q carrying equal amount of CURRENT in the same direction are BROUGHT nearer. The current in both p and q decreases
6.

A conductor has 2.4×10^-18 C of positive charge.How many charge are in excess or short?

Answer»

haaaaaaaaaaaaaaaaaaaa

7.

Which of the following does not use the application of eddy current? (a) Electric power meters (b) Induction furnace (c) LED lights (d) Magnetic brakes in trains

Answer» LED LIGHTS.... ......
8.

Direction of current induced in a wire moving in a magnetic field is found using (a) Fleming’s left hand rule (b) Fleming’s right hand rule (c) Ampere’s rule (d) Right hand clasp rule

Answer»

Direction of CURRENT induced in a wire moving in a magnetic field is using Fleming's right hand rule. According to the rule, if we extend the fore finger, middle finger and the thumb of our right hand perpendicular to each other as shown in the FIGURE with the thumb pointing towards the MOTION of the conductor and the fore finger pointing towards the magnetic field direction, the the middle finger gives US the direction of induced current flowing in the CIRCUIT.

9.

If number of turns in primary and secondary coils is increased to two times each, the mutual inductance (a) becomes 4 times (b) becomes 2 times (c) becomes A times (d) remains unchanged 4

Answer» B.....................
10.

A metal plate can be heated by (a) passing either a direct or alternating current through the plate. (b) placing in a time varying magnetic field. (c) placing in a space varying magnetic field, but does not vary with time. (d) both (a) and (b) are correct.

Answer» PASSING EITHER a direct or ALTERNATING current through the PLATE.
11.

There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then (a) current is induced in the loop in the anti-clockwise direction. (b) current is induced in the loop in the clockwise direction. (c) ac is induced in the loop. (d) no current is induced in the loop.

Answer»

no CURRENT is INDUCED in the LOOP

12.

Lenz’s law is a consequence of the law of conservation of (a) charge (b) energy (c) induced emf (d) induced current

Answer» TION:the ANSWER is B)ENERGY
13.

NEWTON'S THIRD LAW OF MOTION​

Answer»

Newton's third LAW of motion STATE that EVERY action has equal and opposite reaction..I HOPE it's helpful for you

14.

Prove the following equation is dimensionally correct1\f = 1/p + 1/q​

Answer»

tion:1 /F = 1 /P + 1 /qThe following equation is dimensionally correct because only PHYSICAL QUANTITIES of same dimension can be added together i.e.         Dimension of 1 /p and 1 /q are same.Two physical quantities of same dimension when added together gives a physical QUANTITY with the same dimension as that of the added quantities i.e         Dimensions of 1 /p, 1 /q and 1 /f are the same.

15.

Ball A is projected towards right with velocity 3m/s from top of a tower. Ball B is projected towards left with velocity 4m/s from top of the same tower, 2 seconds after ball A. The separation between them 2 sec after projection of ball B is (k x square root of 5) meters. Find k​

Answer»

I DO NOT KNOW ANSWEREXPLANATION:MARK AS BRAIN LIST I WILL FOLLOW YOU

16.

What is the C. G. S unit of force.How is it defined? ​

Answer»

The unit of FORCE in CGS system is called as Dyne (d). It is the forcerequired to deliver an acceleration of 1 cm/s to a body of mass 1 g. Dyne is the CGS unit of force, this determines its definition: it is the force which accelerates a mass of one gram at the rate of one centimeter PER SECOND per second

17.

Time period of Pendulum is 4 seconds find its length given G is equal to 10 metre per second square​

Answer»

K AS BRAINLIST PLEASE FORMULA TO SOLVE IT ISPut the values and solve

18.

What is the C. G. S unit of force and define it​

Answer»

The unit of force in CGS system is called as Dyne (d). It is the forcerequired to DELIVER an ACCELERATION of 1 cm/s to a body of mass 1 g. Dyne is the CGS unit of force, this DETERMINES its definition: it is the force which accelerates a mass of one gram at the RATE of one centimeter per SECOND per second.Hope it will be helpful for you.Plz plz mark as brainliest!!!!!!

19.

A person runs along a circular path of radius 5mts if he completed half of the circle find the magnitude of the displacement vector,how far the person ran

Answer» SON ran  Magnitude - 10 m.Explanation :Given :A person runs along a circular path of radius 5 m.To Find :How far the person can run.Solution :What is DISPLACEMENT ?Displacement is a vector from start to the final POSITION. This is STRAIGHT line.So,It will be same as the diameter of the circular path.Magnitude :We know that :So,
20.

Question : Which automobile component produce dust?

Answer»

RoboVent understands the workflows, processes and challenges of AUTOMOTIVE PARTS manufacturing. Let us DESIGN you a CLEAN solution ...

21.

The magnification of the image formed by the sperical mirror is -1.25.if object size is 2cm,then find size of the image?

Answer»

u=−20f=−15We KNOW F1 = v1 + U1 −151 = v1 + −201 v=−60cmNow the MAGNIFICATION m=− uv =−3Height of OBJECT h=1cmHeight of image h 1 =∣m∣×h=3×1=3cm

22.

A metal sphere is suspended from a nylon thread. Initially, the metal sphere is uncharged. When a positively charged glass rod is brought close to the metal sphere, the sphere is drawn towards the rod. But if the sphere touches the rod, it suddenly flies away from the rod. Explain, why the sphere is first attracted then repelled?

Answer»

a metal sphere is suspended from and only thread international the metal sphere is CHARGED positively charged glass rod is BROUGHT CLOSE to the mental spear the spare is drawn towards the road but is the speed touches the IT suddenly feels prod EXPLAIN why the"is faster attracted the replied a metal sphere is suspended from a dialogue is the mental sphere is uncharged with a positively charged glass rod is not closed I hope it helps you MARK me has a brain least mark

23.

Faraday’s laws are consequence of the conservation of (a) charge (b) energy (c) magnetic field (d) both (b) and (c)

Answer» FARADAY’s LAWS are CONSEQUENCE of the CONSERVATION of ENERGY
24.

In a coil of self-induction 5 H, the rate of change of current is 2 As-1. Then emf induced in the coil is (a) 10 V (b) -10 V (c) 5 V (d) -5 V

Answer»

tion:Mechanical circulatory support for the smallest newborn pediatric patients has historically been limited to EXTRACORPOREAL membrane oxygenation, which can only provide several DAYS to weeks of full cardiac support; far SHORT of the median waiting TIME for pediatric heart transplantation of nearly three months [1].

25.

A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10-5 weber. The inductance is (a) 0.2 mH (b) 2.0 mH (c) 0.02 mH (d) 0.002 H

Answer» TION:Li=N∅L×5=100×10 −5 L=0.2mH
26.

The susceptibility of a magnetic material is 1.9 × 10-5. Name the type of magnetic materials it represents.

Answer» SUSCEPTIBILITY is SMALL POSITIVE, so MATERIAL is PARAMAGNETIC.
27.

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was (a) moving towards the solenoid (b) moving into the solenoid (c) at rest inside the solenoid (d) moving out of the solenoid

Answer»

(D) MOVING out of the solenoidkeep SMILING .

28.

Lenz’s law of electromagnetic induction is as per law of conservation of (a) energy. (b) momentum angular. (c) charge. (d) electromotive force.

Answer» OPTION (C)is RIGHT CHARGE
29.

When current in a coil changes from 5 A to 2 A in 0.1 s, average voltage of 50 V is produced. The self-inductance of the coil is (a) 1.67 H (b) 6 H (c) 3 H (d) 0.67 H

Answer»

It is given that,Initial current, I = 5 AFinal current, I' = 2 ATime in changing current, t = 0.1 sVoltage of the coil, V = 50 VTO find,The self INDUCTANCE of the coil.Solution,Due to the change in current with TIME and emf is INDUCED in the coil. It is given by in terms of self inductance as :So, the self inductance of the coil is 1.67 H.PLEASE MARK ME AS A BRAINLIEST..

30.

The susceptibility of a magnetic material is 0.9853. Identify the type of magnetic material. Draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field. [CBSE 2018]

Answer»

The TYPE of MATERIAL is PARAMAGNETIC material.

31.

The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is

Answer»

ϕ=MBAcosθ=MBAcos90 o ϕ=0

32.

The current flows from A to B is as shown in the figure. The direction of the induced current in the loop is (a) clockwise. (b) anticlockwise. (c) straight line. (d) no induced e.m.f. produced.

Answer»

tion:Direction of MAGNETIC field due to indicated CURRENT will be in upward direction passing through the COIL. So, a current in coil will be induced so that it DECREASES the flux in the coil. So, current in the CLOCKWISE direction will be induced.

33.

A coil having 500 sq. loops of side 10 cm is placed normal to magnetic flux which increases at a rate of 1 T/s. The induced emf is (a) 0.1 V (b) 0.5 V (c) 1 V (d) 5 V

Answer» ANSWER is OPTION d
34.

What are permanent magnets? Give one example. [Delhi 2013]

Answer»

Magnets which possess higher retentivity and COERCIVITY and RETAIN the magnetic FIELD for LONGER period are called permanent magnets. Example. ALNICO, Nipermag, Steel.

35.

The time period of an oscillating spring of mass 630 g and spring constant 100 N/m with a load of1 kg is​

Answer»

tion:TIME period = 2pie XSQUARE ROOT of (ms/3)+m/ k. hence t = .22Π

36.

What is ohm's law? derive a equation and define 1 ohm....! ✌​

Answer»

aw STATE that POTENTIAL difference is directly proportional to current PASSING through conductor ___There GRAPH is always constant __ i.e where R is constant of PROPORTIONALITY and is called resistance ____ ✨✨✨Plzzz Refer to attachment ____ ☺️☺️

37.

Derive roh formulaRA/L​

Answer»

tion:Resistivity is the resistance per unit LENGTH and cross-sectional AREA. .We know that R = ρ L / A. Thus we can DERIVE the expression for resistivity from this formula. ρ = R A / L, where R is the resistance in ohms, A is the area of cross-section in SQUARE meters and L is the length in meters.Plz mark me BRAINLIEST.

38.

Can we travel in time machine? ​

Answer»

Not now but in FUTURE I THINK OFCOURSE

39.

Keeping velocity of horizontal projectile constant how many times height of the tower must be so that horizontal range gets doubled​

Answer» GHT of the tower must be four times so that the initial horizontal velocity gets doubled. Explanation:The horizontal velocity involves the MOTION that deals in the x direction, i.e, only side to side. This velocity does not deal in the up and down direction. By keeping the horizontal velocity of a projectile constant, it becomes a never changing value. The acceleration occurred through gravity is 9.8 m/s/s.The height of the tower must be four times so that the initial horizontal velocity gets doubled. Under this, as PER the FORMULA, the velocity of projectile remains same or unchanged.Hence, doubling the horizontal range velocity will make the height of tower DOUBLE. However, the angle of the horizontal projectile stays same.Know more:1. If the horizontal velocity of a projectile is root(2/5) times the velocity at half the maximum  height, the angle of projection is brainly.in/question/11374342. Write the equation for the horizontal range covered by a projectile and specify when it will be maximum​brainly.in/question/15092150
40.

Derive roh formulaplz be fast ​

Answer»

culation and RHO In PracticeBut it is calculated as the first derivative of the option's VALUE with respect to the risk-free rate. Rho measures the EXPECTED change in an option's price for a 1 percent change in a U.S. Treasury bill's risk-free rate. Also, rho increases as the time to expiration increases. Rho (uppercase/lowercase Ρ ρ), is the letter of the Greek alphabet, used to represent the "r" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 100. Letters that came from it include the Roman R and Cyrillic Р. The lowercase Rho ("ρ") is used in physics to represent DENSITY.

41.

The motion of a particle along a straight line is described by the equation x = 4 – 12t + 3t3, where x is in metre and t is in second. Acceleration of the particle at t = 2 second will be

Answer»

hat, x = 4 - 12T + 3t³ where x is in METRE and t is in second. We know that,v = dx/dt and a = dv/dtSo, v = d(4 - 12t + 3t³)/dtv = -12 + 3t²Also, a = d(-12 + 3t²)/dta = 3tWe have to FIND the ACCELERATION of the particle at the time (t) = 2 secondSimply, substitute value of t = 2 sec in a = 3t. To find the value of acceleration.→ a = 3(2)→ a = 6Therefore, of the particle at t = 2 second is 6 m/s².

42.

The number of significant zeroes in 0.0010020

Answer»

ficant figuresbut 3 SIGNIFICANT zeroeshere is the EXPLANATION

43.

What is meant by saying electric potential at a point is 10 volts

Answer»

Suppose at point A, ELECTRICAL Potential is 10 Volts. Then, this means that if I bring a positive CHARGE of, say 1 Coulomb, to this point, from infinity, then, 10 JOULE of WORK has to be done to do so.

44.

A sphere of mass m falls on a smooth hemisphere of mass M resting with its plane face on the smooth horizontal table so that at the moment of impact line joining the centres makes an angle α with the vertical. The velocity of the sphere just before impact is u and e is the coefficient of restitution. The velocity of hemisphere after the collision is

Answer»

ocity of hemisphere after the collision isExplanation:If the velocity of the hemisphere, along the centre after collision is V and that of the sphere if v thenFrom the conservation of momentum along the centre of the sphere  ......... (1)Also since restitution is eTherefore,Thus, from eq (1)This will be the velocity of hemisphere in the DIRECTION along its centreThe HORIZONTAL COMPONENT of this velocity will be This is the velocity with which the hemisphere will move after collisionHope this answer is helpful.Know More:Q: A sphere of mass 'm' is moving with a constant velocity 'u' hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of the velocity of TWO sphere after collision will be...Click Here: brainly.in/question/6420412Q: A smooth sphere of mass m strikes a second sphere of mass 2m which is at rest. After the collision their directions of motion are at right angles. Then coefficient of restitution is-Click Here: brainly.in/question/14777758

45.

Which of the following substances are paramagnetic? Bi, Al, Cu, Ca, Pb and Ni [Delhi 2013]

Answer»

PARAMAGNETIC SUBSTANCE ARE:ALUMINIUM(AL) AND CALCIUM(CA)PLEASE MARK ME AS A BRAINLIEST..

46.

Does a bar magnet exert a toque on itself due to its own field? Does on element of a current-carrying wire exert a force on another element of the same wire?

Answer»

Magnet doesn't exert torque on its SELF but it's VARIOUS parts can exert on each other

47.

The susceptibility of a magnetic material is -4.2 × 10-6. Name the type of magnetic material it represents. [Chennai 2019] [Delhi 2011]

Answer» BASED on established linkages between ferrimagnetism and heavy metal concentration of anthropogenic particulates, we attempt here to delineate pollutant residing domains and study the role of surface runoff and WIND circulations over its redistribution in the Pune Metropolitan REGION (PMR) in Maharashtra. A total of 118 samples collected in a ~3 × 3km grid during pre-and post-monsoon seasons for surface soils, bedrock, dust and rainwaters were analysed for magnetic susceptibility (χ lf) and the isothermal remanent magnetization (IRM). The χ lf in the soil profiles decrease from bedrock to intermediate soil horizons but notably increase towards top. Spatial variations based on the fundamental rock magnetic parameters (χ lf and their frequency dependency (χ fd), saturation IRM, demagnetization RATIO) and knowledge of the polluting sources show significant anthropogenic loading for the topsoils. The study further reports remarkable postmonsoon changes in all the parameters controlled by surface run-off due to slope variation which appears to be the most effective mechanism of redistribution and dumping the topsoils loaded with anthropogenic particulate matters. Distribution of χ fd% further infers wind as another important agent for dispersal of finer ferrimagnetic particulate matters predominantly controlled by the topography amongst other meteorological factors. Additional data for succeeding years would help in modelling the redistribution sensitivity and heavy metal residence EFFECT for the topsoils and sediments in the PMR region.
48.

At a place, the horizontal component of earth’s magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth’s magnetic field at equator? [Delhi 2017]

Answer»

he horizontal component of electric field is GIVEN by B=Be COS (o)o is angle of dip Be is TEH NET magnetic field At o is 60°B=Be cos 60°B=Be ( 1/2) Be= 2Bhere Bis BHNow horizontal component at equator BH= Becos ( o)angle of dip at equator is 0BH= Be cos (0)=Be=2BBH=2B

49.

What is the angle of dip at a place where the horizontal and vertical components of the earth’s magnetic field are equal? [Foreign 2012]

Answer»

What is the angle of DIP at a PLACE where the HORIZONTAL and vertical components of the earth’s MAGNETIC field are equal becouse

50.

How does the (i) pole strength, and (ii) magnetic moment of each part of a bar magnet change if it is cut into two equal pieces transverse to its length? [HOTS]

Answer»

where M=Magnetic moment. According to this relation, when a BAR magnet is cut into TWO HALVES ALONG its length, area of cross-section become HALF. But length remains the same. So, the pole strength actually becomes half and consequently the magnetic moment becomes half