Crop Production and Management
Microorganisms: Friend and Foe
Synthetic Fibres and Plastics
Materials: Metals and Non-metals
Coal and Petroleum
Combustion and Flame
Conservation of Plants and Animals
Cell - Structure and Functions
Reproduction in Animal
Reaching the Age of Adolescence
- Adolescence and Puberty
- Changes at Puberty
- Secondary Sex Characteristics
- Role of Hormones in Initiating Reproductive Function
- Reproductive Phase of Life in Humans
- Sex of the Baby Determined
- Hormones Other than Sex Hormones
- Role of Hormones in Completing the Life History of Insects and Frogs
- Concept of Reproductive Health
Force and Pressure
Chemical Effects of Electric Current
Some Natural Phenomena
Star and Solar System
Pollution of Air and Water
- Do Liquids Conduct Electricity?
- Good/Poor Conducting Liquids
A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
(1) liquid A is a better conductor than liquid B.
(2) liquid B is a better conductor than liquid A.
(3) both liquids are equally conducting.
(4) conducting properties of liquid cannot be compared in this manner.
When the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason?
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this.
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason?
Is it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain.