Question

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Answer 1

1) State Ohm's law.

Ohm's law states that the potential difference across the two points of a conductor is directly proportional to tbe current flowing through it.

Explanation:-

It means that if the current flowing through the current is increased, then the potential difference is also increased.

Experimental verification:-

Set up a circuit as shown in the figure containing following components:

•》Battery:- To maintain the potential difference across the circuit.

•》Voltmeter:- It is used to measure the potential difference across the conductor and is always fitted parallel to the conductor.

•》Ammeter:- To measure the current flowing throught the circuit.

•》Key:- To close and break the circuit.

•》Rheostat:- It is used to increase and decrease the current in the circuit.

Now if we switch on the circuit, we note the current and the voltage. Now increase the current through the rheostat. Now repaet the process 3-4times. We can see that the as we increase the current, the potential difference also increases. If we make a graph Current by voltage we can see that it is a straight line which indicates the uniform increase of potential difference along with current.

2) Mirror formula

$\sf \small{ \frac{1}{f} = \frac{1}{v} + \frac{1}{u} }$

where,

f = focal length,

v = image distance,

and, u = object distance

More to know:-

$\sf \footnotesize{lens \: formula = \frac{1}{f} = \frac{1}{v} - \frac{1}{u} }$

3) Nematocyst

It is a specialised cell which is present in the tentacles or any other projecting part of any coelentereta ( like jelly fish) or any other which contains coil and contains poison which is used for self defense.

4) Complex tissue

Complex tissue can be defined as those tissues which contain more than ome type of cell and they work together in order to carry out the complex processes like transportation of water and food in the plants. Some examples are the Xylem and phloem tissue.

Xylem tissue:- It is a plant tissue which carry or transports water and minerals from roots to other parts of the plants.

Phloem tissue:- It is also a plant tissue which carry food prepared in leaves to roots and other parts of the plant.

Answer 2

Answer:

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