Recently Active Physics Questions

a thermocouple is made frm two metals antimony n bismuth .if one of the junction is kept cold n other hotthen e current ll flow frm a)antimony to bismuth at hot junction b)bismuth to antimony at cold jctn' c)not flow d)flow f ...

st 1 dimension of inductance=ml2/c2 st2 dimension of ind=dimension of resistance n E=i2rt ...

if the lattice constant of the semi conductor is decreased.,wat ll happen to energy of valence band ,e of conduction band n energy gap bw both bands . plzz explain ...

two blocks of mass 3 n 6kg r attached to a spring of k=800N/M on a horizontal surface.the spring is initially compressed by 6 cm n then released. 1. the particales perform SHM with time period π/10 sec. 2. the block of mass ...

two spherical conductors a n b of radii 1 mm n 2 mm are separated y a distance 5 cm n are uniformly charged .if the spheres r connected by a conducting wire then in equilibrium condition ,the ratio of the magnitude of e field ...

a linear harmonic oscillater of force constant 2*106N/M n amplitude 0.01m has a total mechanical energy of 160 joule.its 1. max. potential energy is 100J 2. max. kinetic energy is 100J 3. max. potential energy is 160J 4. min. ...

*Image* A charged particle (mass m) is hanging from a point and is just abocve the ground initially. Let the position of the charged particle now be G .. A man brings another charged particle from infinity to G along a straig ...

*Image* In figure m1=1 kg and m2=4kg.Find the mass M of the hanging block which will prevent the smaller the block from slipping over the triangular block.All the surfaces are frictionless and the strings and the pulleys are ...

A force F1 accelerates a particle from rest to velocity v.Another force F2 decelerates the same particle from v to rest,then: (a)F2 is always equal to F1 (b)F2 is greater than F1 (c)F2 may be smaller than ,greater than or equ ...

The frequencies of two tuning forks are 480 cps and 480.05 cps respectively. When sounded together, after how much interval the maximum sound will become half if the minimum intensity is zero ? 5 s 10 s 20 s 0.025 s ...

What is the significance of coefficient of friction??? ...

A block of mass m is placed at rest on an inclined plane of inclination @ to the horizontal.If the coefficient of friction between the block and the plane is U then the total force the inclined plane exerts on the block is : ...

PG-102 EXAMPLE 7.3 FOLLOWING THINGS ARE WRONG IN IT- 1.HOW CAN WE CALCULATE LINEAR ACCELERATION WHEN THE PARTICLE IS MOVING WITH UNIFORM SPEED. 2.THEY USED FORMULA LINEAR ACCELERATION=v2/r [4] WHICH IS THE FORMULA FOR RADIAL ...

*Image* A block is placed as shown in the figure .What must be the frictional force between the block and the incline if the block is not to slide along the inclibe when the inclone is accelerating to the right at 3m/s2 (sin ...

_____________________________________________________________ A ----------------------------- B l l → l l → ________________ _l_______________ _l_______________→_____________ l l l l D l-----------------------------l C ...

A plate, bent at right angles along its center line, is placed onto a horizontal fixed cylinder of radius R as shown in the figure. *Image* How large does the coefficient of static friction between the cylinder and the plate ...

a particle experiences constant acceleration for 6 secs after starting fom rest. it travels d1 in first 2 secs it travels d2 in next 2 secs it travels d3 in last 2 secs then, d1:d2:d3 = ??? ...

*Image* A block is plzced as shown in the figure.What must be the frictional force between block and incline if the block is not to slide along the incline when the incline is accelerating to the right at 3m/s2 (sin37°=3/5)? ...

can anyone explain Knee voltage w.r.t. diodes ...

we know the shape of electric lines of force....we also know that they r imaginary...but wt is the basis of that shape?????gow can we say that they have that same shape????do v have a proof 4 it???? ...

i made up this question last nite,.,...so forgive me for languge error..... *Image* but i hopw u get the essence of the question ...

coeficient of coupling betwn two coils of self inductance L1andL2 is unity it means 50% flux of L1 is linkd wid L2 100% flux of L1 is linkd wid L2 (L1)^1/2 times flux of L1 is linkd widL2 none ...

*Image* I thot the Question says "in the lie of fall of the ball" meant there will be no deviation in the ray path and hence i wrote 12m/s [2] Can sum1 tell me wat is wrong in my thinkin as the ans given is 16m/s ...

A body is allowed to slide on a frictionless track from rest position under gravity. The track ends into a circular loop of diameter D. What should be the minimum height of the body in terms of D so that it may complete the l ...

A man of mass 'm' stands on a platform of mass 'M' kept on a ice block (friction = 0). If the man walks on the platform with a velocity 'v' w.r.t the platform, the relative velocity of the platform, the relative velocity of t ...

Can someone post gud no... of Q in Commn. and Electronics .........And do we hav statics and dynamics in AIEEE09?? ...

1)A solid sphere and a hollow sphere of same material ,size are heated to same temperature and allowed to cool. If temp diff bet body and sphere is t, then a)Both spheres will cool at same rate b)hollow faster c)solid faster ...

*Image* The bar buckles as a result of a temp rise of 32 deg c. l0=3.77m and alpha=25x10-6.Find x.(the bar buckles exactly at the center) ...

A Cassegrain telescope uses two mirrors 20 mm apart. radius of curvature of the mirrors 220mm and 140 mm.when object at infinity..final image will be formed at...??? ...

*Image* nw d q says wich of d curve is adiabatic options AB and BC AB and CD AD and BC BC and CD ...