(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

 A faulty balance of unequal arms and pans of unequal weights is used to find the true weight of a metal. By double weighing the weights are found to be 1210 g and 1000 g. Calculate the true weight of the metal.

Name the scientist who discovered
 X-rays

Name the scientist who discovered Visible light

Name the scientist who discovered Microwaves 

Name the scientist who discovered radio waves

Name the scientist who discovered Infra-red waves

Name the scientist who discovered Ultraviolet rays

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.

Name the two waves. compare the speeds of these waves when they travel in vacuum.

The above table shows different parts of the electromagnetic spectrum.
(a)    Identify the parts of the spectrum marked as A, B, C and D.
(b)    Which of the radiations A or B has the higher frequency?
(c)    State two properties which are common to all parts of the electromagnetic spectrum.
(d)    Name one source of each of the radiation of electromagnetic spectrum.
(e)    Name one detector for each of the radiation.
(f)    Name one use of each of the radiation.

1. 1. Calculate the speed of the wave.
   2. Name the medium through which it is traveling.

In equilibrium algebraic sum of moments of all forces about the point of rotation is ______.

The moon revolving around the earth is in ______ equilibrium.

In figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R₁ and R₂ at the ends. 

`["Hint:"  "In equilibrium"  "R"_1 + "R"_2 = "W"   "and"   "R"_1 xx l/2 = "R"_2 xx l/2]`

State the condition when the work done by a force is negative. Explain with the help of examples.