Explore topic-wise InterviewSolutions in Current Affairs.

Decapod MEANS "ten footed"creature.
examples are:CRABS,LOBSTERS,prawns

The FOCAL LENGTH INCREASES in WATER

We KNOW that 1 LIGHT YEAR = 9.5 * 10^15 m
Thus 4.3 light YEARS = 40.85 * 10^15 m = 4.085 * 10^16 m.

A force, arising from the body's inertia, which appears to act on a body moving in a circular path and is DIRECTED AWAY from the centre around which the body A FICTITIOUS force, also called a pseudo force is an apparent force that acts on all masses whose motion is described using a non-inertial FRAME of reference, such as a rotating reference frame.

Length of hydrometer stem = 10cm
volume of hydrometer stem = 10cm³
So base area (A)= 10cm³ / 10cm = 1cm²

When it is PUT in pure water, It sinks to 5cm mark
mass of hydrometer = 200g
since it is floating, mass of water DISPLACED = mass of hydrometer = 200g
assuming density of water = 1g/CC

volume of hydrometer(upto 5cm mark) = mass of water displaced/density of water                                                               =200/1
                                                           = 200 cc

now if it is put in a liquid where
(i) it sinks to the top of the stem,
the mark till which it sinks is 10cm.

volume of liquid displaced = volume of hydrometer(upto 5cm mark) + volume of hydrometer from 5cm mark to 10 cm mark
                                       = 200 cc + (10-5)cm×1cm²
                                       = 205cc
     [(10-5) is the height and 1cm² is the base area]
                                       
density of liquid = mass of hydrometer / volume of liquid displaced
                        = 200/205
                        = 0.9756 g/cc

(ii) it sinks to the bottom of the stem,
the mark till which it sinks is 0cm.

volume of liquid displaced = volume of hydrometer(upto 5cm mark) - volume of hydrometer from 0cm mark to 5 cm mark
                                       = 200 cc - (5-0)cm×1cm²
                                       = 195cc
     [(5-0) is the height and 1cm² is the base area]
                                       
density of liquid = mass of hydrometer / volume of liquid displaced
                        = 200/195
                        = 1.0256 g/cc

First you need to know what is moving coil - galvanometer ???Galvanometer is operated by the force exerted by an electric current flowing in a movable coil suspended in a magnetic field.................. !!!!WORKING of moving coil of galvanometer :- Principle: -Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it EXPERIENCES a torque.Principle:Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque.Working:Suppose the coil PQRS is suspended freely in the magnetic field.Letl = Length PQ or RS of the COILB = Breadth QR or SP of the coiln = Number of turns in the coilArea of each turn of the coil, A = l × bLet B = Strength of the magnetic field in which coil is suspendedI = Current passing through the coil in the direction PQRSLet, at any instant, α be the angle which the normal drawn on the plane of the coil makes with the direction of magnetic field.The rectangular coil carrying current when placed in the magnetic field experiences a torque whose magnitude is given by,τ = nIBA sinαDue to deflecting torque, the coil rotates and SUSPENSION wire gets twisted. A restoring torque is set up in the suspension wire.Let θbe the twist produced in the phosphor bronze strip due to rotation of the coil and K be the restoring torque per unit twist of the phosphor bronze strip. Then,Total restoring torque produced = kθIn equilibrium POSITION of the coil,Deflecting torque = Restoring torque∴ NIBA = kθ. So this is the working moeel of galvanometer

A conductor is any material that LETS electricity to pass through it which MEANS it can conduct electricity through it.An insulator is a meterial which DISSENT LET electricity to pass through it .

Dark MATTER ABSORBS all  the colour falling on it.so the PROSPECTS of dark matter are not CLEAR  to us

Due to the refraction of LIGHT by the VARIOUS LAYERS of the ATMOSPHERE, the stars appear to twinkle or SHINE at night.

The height to which the BODY REACHES after 2 seconds
S = ut + 1/2a t^2
= 15*2 - (1/2 * 10 * 4)
= 30 - 20
= 10 m
Potential energy gained by body = mgh = 1.5 * 10 * 10 = 150 J

ELECTRONICS,A COMPONENT OF ATOMS AND THEIR USE ARE KNOWN AS ELECTRONICS. THEY PLAY AN IMPORTANT ROLE ON THE OTHER PIECES OF HOUSE EQUIPMENT . BASIC ELECTRONICS COPRISES THE MINIMAL  ELECTRONICS COMPONENTS THAT MAKE UP A PART OF EVERY DAY ELECTRONICS EQUIPMENT . THESE ELECTRONIC COMPONENTS INCLUDE RESISTORS, TRANSISTORS , CAPACITORS DIODES, INDUCTORS AND TRANSFORMERS . POWERED BY A BATTERY, THEY ARE DESIGNED TO WORK UNDER CERTAIN PHYSICS .PLEASE MARK MY ANSWER AS THE BEST PLEASE I REQUEST U TO MARK AS BEST

1gcm² is not a FORCE. It can be 1 gcm/s².

force = 1 gcm/s² = 10^(-5) N
displacement = 1m
work DONE,W₁ = FS = 10^(-5)×1 = 10^(-5) J

Work done by a force 1N in displacing the object by 1m is given by
W₂ = 1×1 = 1J

OHH don't worry FIRST you have to learn some main TOPICS like ATOMS, in rutherford's model of ATOM, Rutherford nuclear model, Spectrum and you shold solve some important numericals which you feel that this numerical is important and able to come on exam.

Now you should learn some important topics:-
1. Lyman series
2 PFUND series
3 Paschen series 
4. balmer series 
5 BRACKETT series

learn these topics carefully and best of luck for your exams.

Me = 4/3 π Re³  * d,   where  Re = Radius of Earth   
            Me = Mass of EArth         d = density of Earth  (we assume it is uniform)

Let us find the gravity at a distance r from the center of Earth.  Mass of Earth enclosed inside the radius r is :

M = 4/3 π r³ d  = 4/3 π r³ (3Me /Re³ 4π)
    = Me r³/ Re³

Gravity at a location r distance AWAY from center of Earth is = G (Me r³/Re³) / r²
  THUS  g' = G Me r / Re³ = g r /Re ,
              where g = acceleration DUE to gravity at the surface of Earth.
 
       Thus  if r = 0,  g' = 0.

In other words,  M  varies as cube of R  and  in the denominator, we have a square of R.  Thus g is proportional to R inside the Earth's surface.

If u are standing on a steep hill and have to PUSH your CAR because u dont have petrol in it to run it it WOULD be easier to do it. 
but if u do same THING on a FLAT road it would be difficult.

Butter paper considered a TRANSLUCENT MATERIAL because of RAW material which is used in it and the PROCESS of making it. It contains cellulose fibre forms the basis of the paper.

I suppose A) Sun ,  as the sun is FARTHEST.    so  1/u = 0.    v = f.

     The objects  Sun and a well illuminated building are  good sources of light.  Because they are distant, the rays from them on to the small concave mirror are parallel.  Thus, the rays converge at the focal point.   You need a very small PIECE of paper or screen to capture the image.  In fact,  the image will be a small bright spot.  The Sun may be a better SOURCE in the day.   But to be careful the screen (or the paper) may BURN due to the concentration of HEAT at the focus.

     The class room window and the distant tree are not light sources themselves.  So they may not reflect a lot of light.  As the image is very small at the focal point, we cannot identify the image of the tree or window.

1/f = 1/ u + 1/V

1/v = 1/f - 1/u      => v = u f / (u - f)

in a concave mirror with an inverted real image on screen, all QUANTITIES, v , f and u are negative. So the negative sign cancels out.
      
   if  u increases a little, then v  DECREASES,  If u decreases then v increases.

Depending on the position of the object and screen with respect to the mirror, one may have to move in EITHER direction.

Moving the mirror away or towards the object , could depend on the position of the object -- if it is outside the 2 * focal length distance or if the object is placed between the center of curvature and the principal focus point.

A)a screen,a mirror holder and a scale
OPTION C and D never be true.because it does not contain appropriate material.confusion can be in A and B.by looking B option we SEES that  there is not present screen,which is NECESSARY for making image.Hence option A is correct

(i)p=1/f

   2=1/f

f=1/2=0.5(CONVERGING LENS)

(II) -4=1/f

f=1/-4= -1/4=0.25

There are many meanings of  homeostasis one of the MEANING ISIT means keeping our THINGS constant or UNIFORMED.