NDA PHYSICS QUIZ - 10

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Question 1:

A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω. Which of the following is the resistivity of its material ?

Question 2:

What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 × 10-6 m2, if the resistivity of the metal be 2.8 × 10-8 Ωm ?

Question 3:

A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω. How much current would flow through the 12 Ω resistor ?

Question 4:

A resistor has a resistance of 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line ?

Question 5:

In the circuit diagram given below five resistances of 10 Ω, 40 Ω, 30 Ω, 20 Ω and 60 Ω are connected as shown to a 12 V battery. Calculate the total resistance in the circuit.

Question 6:

A 4 Ω coil and a 2 Ω coil are connected in parallel. A total current of 3 A passes through the coils. What current passes through the 2 Ω coil ?

Question 7:

Two resistances when connected in parallel give resultant value of 2 ohm; when connected in series the value becomes 9 ohm. Calculate the value of each resistance.

Question 8:

A resistor of 8 ohms is connected in parallel with another resistor X. The resultant resistance of the combination is 4.8 ohms. What is the value of the resistor X ?

Question 9:

You are given one hundred 1Ω resistors. What is the largest resistance you can make in a circuit using these?

Question 10:

Four resistances of 16 ohms each are connected in parallel. Then the equivalent of such four resistances is connected in series. What would be the total resistance?