Which animals communicate on under water sounds?
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Why a pen used for writing with ink is always split as its pointed end?
Define weight?
Explain what instrument is used to measure volume?
The gravitational force between two blocks is F what would happen if a mass of both the blocks as well as distance between them is doubled?
Explain the Mass and Weight ?
What are wave fronts?
A coil consisting of 200 turns of wire has its ends connected to a circuit such that the total resistance of the coil and the circuit is 2.0 ohm. There is no source of e.m.f. in the circuit. Each turn of the coil is a square of side 18 cm, and a uniform magnetic field directed perpendicular to the plane of the coil is turned on. If the field changes linearly from 0 to 0.5 T in 0.8 s, what is the magnitude of the current in the coil while the field is changing?
Who determined that the square of a planets period is proportional to the cube of its average distance from the sun?
What is Electromagnet?
Explain real and virtual image?
Which element has the simplest absorption spectrum?
What is the effect of using two converging lenses in one optical instrument?