Question 1

What is the maximum resistance which can be made using five resistors each of 1/5Ω ?

Accepted Answer

1 Ω

Answer

1/5 Ω

Answer

5Ω

Answer

10 Ω

Question 2

The resistors in parallel in the following circuit are: -

Accepted Answer

(R₁ + R₂) with R₃

Answer

R₁ and R₃

Answer

R₂ and R₃

Answer

a) R₁ and R₂

Question 3

The resistivity does not change if

Accepted Answer

Shape of the resistor is changed

Answer

The material is changed

Answer

Both material and temperature are changed

Answer

The temperature is changed

Question 4

Assertion: To measure the current in a circuit, an ammeter is always connected in series.

Reason: Ammeter offers very high resistance to the circuit in which it is connected.

Accepted Answer

A is true but R is false.

Answer

Both A and R are true and R is correct explanation of the assertion.

Answer

A is false but R is true

Answer

Both A and R are true but R is not the correct explanation of the assertion.

Question 5

Assertion : Fuse wire must have high resistance and low melting point.

Reason : Fuse is used for small current flow only.

Accepted Answer

A is true but R is false

Answer

Both A and R are true and R is correct explanation of the assertion

Answer

Both A and R are true but R is not the correct explanation of the assertion

Answer

A is false but R is true

Question 6

State Ohms law

Accepted Answer

Ohm's Law states that electric current flowing in a conductor is directly proportional to potential difference across the ends of the conductor, provided temperature and other physical conditions remains constant

Question 7

What is meant by saying that a potential difference between two points is 1V?

Accepted Answer

Potential difference between two points is said to be 1 volt when 1 Joule of work is done to move a charge of 1 Coulomb from one point to another.

Question 8

100 joules of heat is produced per second in a 4 Ω resistor. What is the potential difference across the resistor?

Accepted Answer

20 v

Answer

18 v

Answer

17 v

Answer

16 v

Question 9

a) Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why?

Accepted Answer

The current will flow more easily through the thick wire than the thin wire. It is because the resistance of a conductor is inversely proportional to its area of cross-section.

Question 10

State Joules law of heating

Accepted Answer

The amount of heat produced is directly proportional to the resistance R of the conductor, the time t for which the current flows, and to the square of the magnitude of current I.

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