The element eka-silicon in Mendeleev’s periodic table is known as ………… in the modern periodic table.
The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is
What will be the change in the current if the potential difference is kept constant and the resistance of the circuit is made four times?
- It will remain unchanged.
- It will become four times.
- It will become one-fourth.
- It will become half.
A ray of light strikes the glass slab at an angle of 50°. What is the angle of incidence?
If the equivalent resistance is to be increased, then the number of resistances should be connected in
- Mixed arrangement
- None of the above
Find the resistance of a conductor if 0.24 A current is passing through it and a potential difference of 24 V is applied across it.
After you have dinner tonight, wash your own plates with soap/detergent.
- What colour change is observed when soap/detergent is applied?
- Name the type of reaction and explain it.
Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:
|Methyl Orange||No change||......................|
Given below is a diagram showing a defect of human eye. Study it and answer the following questions.
(i) Name the defect shown in the figure.
(ii) Give reason for this defect of eye in human being.
(iii) Name the type of lens used to correct the eye defect.
With a neat labelled diagram and derive the equation for three resistances connected in parallel.