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CBSE Questions

Total Questions 9982
what is law of relativity?
which is the smallest atom?
The escape velocity of a body from a planet may depend on the following factors a.acceleration due to gravity g and b. radius of the planet R and c. the mass of body m . By applying dimensions derive a correct relation for escape velocity in terms of the given quantities
The time oscillations t of a small drop of a liquid under surface tension depends on the density d ,radius r and surface tension s.Dimensionally derive the relation between time and the given quantities
Assuming that the period of vibration of a tunning fork depends upon the length l of the prong and on the density and Young's modulus y of the material.Find the method of dimensions,a formula for the period of vibration
Assuming that the critical velocity Vc of a viscous liquid flowing through a capillary tube depends upon the radius a of the tube,the density ? and the coefficient of viscosity ? of the liquid .Obtain a relation for Vc in terms of given quantities
The viscous force F acting on a ball when it moves through a viscous medium may depend on the following factors. 1.radius r of the ball 2.speed v 3.the coefficient of viscosity. Derive the correct relation for viscous force in terms of the given quantities .Take the constant of proportionality as k = 6?
The wavelength lambda associated with a moving electron depens upon its mass m ,its velocity v and planck's constant h.Prove using the method of dimensions
An essay on land degradation
A 9ohm resistor is bent into an equilateral triangle.The effective resistance between the adjacent corners is_________
A heating element using nichrome connected to a 112V supply draws a current of 1.6A initally and after some time it settles to 1.4amp.What is the steady temperature of the heating element,if the room temperature is 30degreeC and average coefficient of resistance is 1.4*10^-4/C.
At room temperature ie at 27degreeC.,the resistance of a heating element is 100ohm.What is the temperature of the element if the resistance is found to be 117ohm,Assume the tepmperature coefficient of resistance of the material is 1.7*10^-4/C.
A wire of length 1m has a resistance of 2ohm.What is its resistivity if the radius of the wire is 0.2mm.
A small pin fixed on a table top is viewed from above from a distance of 50cm.By what distance would the pin appear to be raised if it is viewed from the same point through a 15cm thick glass slab held parallel to the table. mue of glass is 1.5.
Calculate the conductivity of resistance of 0.01ohm if the area of cross section is 10^-4m2 and length 10cm.
A copper wire is stretched to make it 0.1% longer.What is the percentage change in resistance.
What is web design?
Why molecules are closely packed?
What are the differences between fertilizers and manures? Why it is used in growth of crops?
What is thermosetting plastics and its properties ?