At the center of earth dt R, value of “g”?
In a series resonant R-L-C circuit, the voltage across R is 100 V and the value of R = 1000 W. The capacitance of the capacitor is 2 ´ 10-6 F; angular frequency of AC is 200 rad s-1. Then the P.D. across the inductance coil is ______.
Siphon will fail to work if
The terminal potential difference of a battery is equal to its e.m.f. when its internal resistance is?
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
Consider the following statements and select the correct code.
Assertion (A): The temperature of a metal wire rises when an electric current is passed through it.
Reason (R): Collision of metal atoms with each other releases heat energy.
When a temperature rises, the drift velocity of the free electrons decreases. Hence for given applied voltage?
Electronic motors operating at low voltages tend to burn out because
A car is moving on a circular path and takes a turn. If R1 and R2 be the reaction on the inner and outer wheels respectively, then
Choose the incorrect option ?
Which of the following is a dichroic crystal?
Electrical conductors contains?
Mercury is commonly used as a thermometric fluid rather than water because
One radian is defined to be the angle subtended where the arc length “S” is exactly equal to the?
Newton is used to measure
The focal length of a plano convex lens is 'f' and its refractive index is 1.5. It is kept over a plane glass plate with its curved surface touching the glass plate. The gap between the lens and the glass plate is filled by a liquid. As a result, the effective focal length of the combination becomes 2f. Then the refractive index of the liquid is ______.
Which instrument is used to measure changes in volume of substances ?
The most stable particle in Baryon group is
A current flows in a conductor from east to west. The direction of the magnetic Held at a point above the conductor is _______.
The power dissipated in a resistance is given by?
Current has a direction. By convention, current is in the direction that ___.
The sun is seen before the actual sunrise because of __________.
A uniform resistance wire of length L and diameter d has a resistance R. Another wire of same material has length 4L and diameter 2d, the resistance will be
Mica is used in electrical appliances such as electric iron because mica is
The period of a satellite in a circular orbit of radius R is T. The period of another satellite in circular orbit of radius 4R is
How many times more intense is a 60 dB sound than a 30 dB sound?
92U235 undergoes successive disintegrations with the end product of 82Pb203. The Number of a and b particles emitted are
The drift velocity of mobile charge carriers in electric circuits is ____.