Question

Q.1) solve the following ( all compulsory)
1.distinguish between
a) voltmeter and ammeter. 2
b) resistance and resistivity 2
c) acid and bases. 2
D) cation and anion. 2
2. Define
a) atomic mass number. 1
b) valency. 1
3. State law of conservation of matter 2
4. Write the note on Ph scale. 2
5. Explain the following reaction giving there balance chemical reaction
a) NaOH solution was added to HCL solutions. 2
b) Sulphuric acid reacts with ammonium hydroxide. 2
Q.2) Give reasons (any six). (12)
1. When an object falls freely to the ground ,it's acceleration is uniform
2. It is easier to stop a tennis ball as compared to a cricket ball when both are traveling with same velocity
3. The wound springs of a watch possess potential energy
4. It is easy to swim in a swimming pool than in a river
5. Connecting wires in a circuit are made of copper and aluminium
6. Wood and glass are good insulator
7.the valency of oxygen is 2
8. The valency of neon is zero

Q.3) explain in detail
1. Obtain an expression for the effective resistance when a number of resistors are connected in parallel and also state it's characteristics
2. Explain in detail with the diagram : electrolysis of water
3. Derive the expression for kinetic energy
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Answer 1

Answer:

(a) 1. Voltmeter- It is the instrument which measure the potential difference.

Ammeter- It is the instrument which measure the current.

(b)Resistance- The property of a conductor due to which it opposes the flow of current through it is called resistance.

Resistivity- The resistivity of a substance is numerically equal to the resistance of a rod of that substance which is 1 meter long and 1 square meter in cross-section.

(c)Acids- Those chemical substances which have a sour taste.

Bases- Those chemical substances which have a bitter taste.

(d)Cation- A positively charged ion is Known as cation.

Anion- A negatively charged ion is Known as anion.