A current of 2A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is__________

(a)

0.5\(\Omega \)

(b)

2\(\Omega \)

(c)

4\(\Omega \)

(d)

20\(\Omega \)

The resistance of a straight conductor is independent of__________

(a)

temperature

(b)

material

(c)

cross sectional area

(d)

shape of cross section

Two resistances R₁ and R₂ are connected is parallel. Their equivalent resistance is__________

(a)

R₁₊R₂

(b)

\(\cfrac { { R }_{ 1 }{ R }_{ 2 } }{ { R }_{ 1 }+{ R }_{ 2 } } \)

(c)

\(\cfrac { { R }_{ 1 }+{ R }_{ 2 } }{ { R }_{ 1 }{ R }_{ 2 } } \)

(d)

\(\sqrt { { R }_{ 1 }+{ R }_{ 2 } } \)

If in the circuit, power dissipation is 150 W, then R - is___________

(a)

2\(\Omega \)

(b)

6\(\Omega \)

(c)

5\(\Omega \)

(d)

4\(\Omega \)

The resistance of a conductor is R. If its length is doubled, then its new resistance will be_______________

(a)

R

(b)

2R

(c)

4R

(d)

8R

Assertion (A) Electric current will not flow between two charged bodies when connected if their charges are same.
Reason (R) Current is the rate of flow of charge.

(a)

If both assertion and reason are true and reason is the correct explanation of assertion

(b)

If both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

If assertion is true but reason is false

(d)

If assertion is false but reason is true.

Assertion (A) : A bird perches on a high power line and nothing happens to the bird.
Reason (R) : The level of bird is very high from the ground.

(a)

If both assertion and reason are true and reason is the correct explanation of assertion.

(b)

If both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

If assertion is true but reason is false

(d)

If assertion is false but reason is true

Define electric field.

Define electric current and give its unit.

Does a solar cell always maintain the potential across its terminals constant? Discuss.

Rubbing a comb on hair makes the comb get – 0.4C.
(a) Find which material has lost electron and which one gained it.
(b) Find how many electrons are transferred in this process.

State Ohm’s law.

On what factor does the resistance of a wire depend at a particular temperature?

Calculate the amount of charge that would flow in 2 hours through an element of an electric bulb drawing a current of 2.5A.

Calculate the effective resistance between A and B as shown is the figure

Write the difference between resistance in series and in parallel.