Recently Active Physics Questions

64. A semiconductor is cooled from T1 K to T2 K. Its resistance (1) will decrease (2) will increase (3) will first decrease and then increase (4) will not change ...

72. Two equal resistances each of 100 W ± 1% (standard deviation) are connected in parallel. The standard deviation of the parallel combination will be (1) 0.5 % (2) 12% (3) 2% (4) 2% ...

77. Adiabatic demagnetization of a substance (1) decrease the temperature (2) increase the temperature (3) increase the volume (4) decrease the volume ...

The double-slit electron interference pattern appears when a large numberof electrons are accumulated at the screen. According to the quantum theory, the interference pattern appears (1) only if a beam of electrons are in tra ...

a particle of mass m is give a certain velocity along a plane which is at angle θ to the horizontal. the velocit given is at a angle of β to the horizontal and the coefficitnet of friction is μ>tanθ hence as the partic ...

HEY GUYS..............CAN ANYBODY PLEASE GIVE SOME OF THE questions that were asked in bitsat-2009............(ofcourse those who have givn thier examination)..sso that we could get the difficulty level..............seriously ...

Two cylinders one heavy and the other light of diameters D and d respectively rest on a horizontal plane. the larger cylinder has a string wound around it to which a horizontal force F is applied. the co-eff. of friction is Î ...

HEY GUYS..............CAN ANYBODY PLEASE GIVE SOME OF THE questions that were asked in bitsat-2009............(ofcourse those who have givn thier examination)..sso that we could get the difficulty level..............seriously ...

calculate net capacitance of this .. *Image* A) 3C B) 2C C) C/2 D) 25C/3 ...

An ice-skater, weighing 60 kg moving at 10 m/s glides to a stop. If 80% of the heat generated by friction is absorbed by the ice, the amount of ice melted will be nearly (1) 30 g (2) 14 g (3) 7.1 g (4) 4.1 g ...

Sir could you advice ,how by just looking at the circuit can yous say that between any two points it will be parrallel or series ...

There is a cone as shown in the fig. A chain of mass m and length l is placed on it( darkened in fig) The cone is now rotated wid Ang velocity ω. Find the tension in the chain.The half angle of the cone is thita(@ in diagram ...

waht is the realation between T1 and T2 *Image* ...

FIND THE FORCE OF ATTRACTION ON A PARTICLE OF MASS m PLACED AT CENTREA OF A SEMICIRCULAR WIRE OF LENGTH L AND MASS M ...

i dont know where to post this...modern or mechanics section... a good test of ur relativistic skills.. Consider a hypothetical experiment in which an electron gun fires negatively charged particles(electrons) at rate of 10^9 ...

a spool is pulled by a force in vertical direction as shown in figure.what is the direction of friction in this case?the spool does not lose contact with the ground. *Image* [prove mathematically] ...

If all the particles of a system lie in a cube,is it necessary that the CM be in the cube ?? I thinks the ans shud b NO. ...

A SOLID SPHERE OF MASS M AND RADIUS R IS HIT BY A CUE AT A HEIGHT H ABOVE THE CENTRE.FOR WHAT VALUE OF H WILL THE SPHERE ROLL WITHOUT SLIPPING? ...

find the time period of a simple pendulum whose length is comparable to the rarius of th earth.... y is it not 2pi√(l/r)? ...

a cubical block of mass m and edge a slides down a rough inclined plane of inclination @ with a uniform speed.find the torque of normal force acting on the block about its centre. ...

Q1. A spherical shell is heated. The volume changes according to the equation Vθ=V0(1+γθ). Does the volume refer to the volume enclosed by the shell or the volume of the material making up the shell or both? Q2. Does the t ...

N identical cells of emf E and internal resistance R are joined in series to form a closed circuit. One cell A is joined with reverse polarity. V across each cell except A is : a) 2E/N b) (N-1)E/N c) NE/(N-1) d) (N-2)E/N ans ...

The charge on a proton in + 1.6 x 10-19 C and thaton an electron is -1.6 x 10-19 C. Does it mean that the electron has a charge 3.2 x 10-19 C less than the charge of the proton ? The ans looks like it is YES,,but i dont think ...

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Can a sail boat be propelled by air blown at the sails by a fan attached to a boat ? Why ? ...

Can a high jumper clear a height even if his CM does not clear the height ?? ...

In a head-on collision between 2 particles,is it necessary that the particles will acquire a common velocity for atleast 1 instance. Can the ans be mathematically derived ?? ...

If the total mechanical energy of a particle is 0,is its LM necessarily 0 ? Is it necessarily nonzero ?? I think is shud b necessarily 0. ...

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A large solid sphere with a uniformly distributed positive charge has a smooth narrow tunnel through its centre. A small particle with negative charge, initially at rest far from the sphere, approaches it along the line of th ...