Question

his question paper consists of a total of 30 questions.
Section-A
1. Name a device that helps to maintain a potential difference across a conductor.
2. What change in colour is observed when white silver chloride is left exposed to sunlight?
What type of chemical reaction is this?
3. The length of a wire is doubled. By what factor does the resistance change [1]
a. 4 times as large b. twice as large c. unchanged d. half as large
4. DIRECTION : In the following questions, a statement of assertion (A) is followed by a
statement of reason (R). Mark the correct choice as:
a. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation
of assertion (A).
b. Both assertion (A) and reason (R) are true but reason (R) is not the correct
explanation of assertion (A).
c. Assertion (A) is true but reason (R) is false.
d. Assertion (A) is false but reason (R) is true.
Assertion : Respiration in living beings is called exothermic reaction.
Reason: Respiration in living beings involves with absorption of heat energy.
5. Beakers A, B, and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions
respectively. Copper pieces are added to each beaker. Blue colour will appear in case of
a. beaker A b. beaker B c. beaker C d. all the beakers​

Answer 1

Answer:

1.Battery,cell,power supply etc.

2.Black metalic colour silver and chlorine gas are produced

3.When length of wire will be doubled resistance will also become 4 times