Specific Heat Capacity and Latent Heat — Physics STD 10 — Question

State expression for Cells connected in parallel.

State the condition when an electric charge can give rise to a magnetic field.

Explain the statement ‘the potential difference between two points is 1 volt’.

A convex lens forms an image of an object equal to the size of the object.Where is the object placed in front of the lens?

What is the safe limit of sound level in dB for our ears?

Name the physical quantity whose SI unit is Nm.

What is an electric motor? State its principle.

What is an ammeter? How is it connected in a circuit?

After a robbery, if a window has been broken, there will be tiny particles of glass. Some of these will be found at the scene of the crime and some may be caught in the thief’s clothing. If the police can prove that these particles are identical, they have a strong case.
A method of doing this is to suspend the particles of glass in a special liquid. Light of a single colour is thrown through the liquid and the particles viewed through a microscope. The temperature of the liquid is then slowly altered. This alters the speed of light through the liquid (i.e., it alters the refractive index). At one particular temperature, the particles of glass disappear. It this happens at the same temperature for both sets of glass particles, they probably came from the same broken pane of glass.
Complete and copy the diagram to show how light bends when it travels from the liquid to the glass and back to the liquid, If the light speeds up in the glass.

Give one use of electromagnetic radiations in Infrared radiation.