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

A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.

How much work each does? Take density of water = 10³ kg m^-3 and g = 9.8 N kg^-1.

An obliquely incident light ray bends at the surface due to a change in speed when passing from one medium to another. The ray does not bend when it is incident normally. Will the ray have a different speed in the other medium?

Compare the speeds of light of wavelength 4000 Å (i.e. violet light) and 8000 Å (i.e. red light) in vacuum.

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

Name the radiation which can be detected by thermopile.

Higher the current rating, _______ is the fuse wire.

How does the thickness of a fuse wire depend on its current rating?

The rating of a fuse connected in the lighting circuit is ______.

To which regions of the electromagnetic spectrum do the following wavelengths belong: 
(a) 250 nm 
(b) 1500 nm 

Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.

State and define the unit of force in the S.I. system.

How is 1 kgf related to the SI unit of force?

What is the work done by the gravitational force on the moon that revolves around the earth?

A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.

State the principle of moments.

Give the units of couple.

Define the term momentum.

Explain why It is easier to knock down a boy who is standing on one foot than one who is standing on two.

Explain when we carry weight, on one hand, we bend on the other side.