Electricity — Science STD 10 — Question

Which instrument is used to measure electric current? How should it be connected in a circuit?

Name the unit which is commonly used for expressing the energy released in nuclear reactions.

Why is the copper tube of a solar water heater painted black from outside?

The radius of curvature of a spherical mirror is 20 cm. What is its focal length?

What type of core should be put inside a current-carrying solenoid to make an electromagnet?

Name the device which converts mechanical energy into electric energy.

Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with highest calorific value first): Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane

Where is the image formed in a human eye?

Name the phenomenon due to which a pencil partly immersed in water and held obliquely appears to be bent at the water surface.

What is the name of:
The curved, transparent front surface of the eye?