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

The S.I. unit of moment of force is ______.

In a beam balance when the beam is balanced in a horizontal position, it is in ________ equilibrium.

The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :

the total clockwise moment about O

The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :

the difference of anticlockwise and clockwise moment

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.

Define non-contact forces.

Give any two effects of a force on a non-rigid body.

State one factor on which the magnitude of a non-contact force depends. How does the magnitude of a non-contact force change along with distance?

Under what condition will a set of gears produce a gain in torque.

How does the distance of separation between two bodies affect the magnitude of the non-contact force between them?

State two factors on which moment of the force about a point depends.