Electric Current(I)

Q.

Choose the ohmic conductor from the below-given options.

1. Transistor

2. Vacuum tube

3. Electrolyte

4. Nichrome wire

Q.

Define one coulomb charge.

Q.

Define one ampere of current.

Q.

__ electrons pass through a lamp in one minute if the current is 200 mA.

Q.

Find the amount of electric charge flowing through the circuit if an electric current of 5 A is drawn by an electric appliance for 5 minutes.

Q. How Regulator controls the speed of Motor in the fan?

Q.

Electric current in conductors is produced due to the flow of

1. Electrons

2. Neutrons

3. Photons

4. Protons

Q. Causes of Short circuit and overloading?

Q. Question 17
When does an electric short circuit occur?

Q.

What is a volt in physics?

Q.

If the amount of electric charge passing through a conductor in 10 minutes is 300 C, the current flowing is
(a) 30 A (b) 0.3 A (c) 0.5 A (d) 5 A

Q.

Why a bulb glow so rapidly even if electrons move at very low speed?

Q.

(a) What is an electric current? What makes an electric current flow in a wire?
(b) Define the unit of electric current (or Define ampere).

Q.

A current of 0.5 A flows through a 60 W lamp. The total charge passing through it in two hours will be __ C.

Q.

Neutrons are made up of one up quark and two down quarks and the quarks have chare.....

So why neutrons do not have charge ?

Q.

A current of 4 A flows around a circuit for 10 s. How much charge flows past a point in the circuit in this time ?

Q.

On what factors does the magnetic field produced by a straight current-carrying conductor depend?

Q.

4 charges +q, +2q, +3q and +4q are placed at the corners of the square ABCD of side 0.1 m respectively. The intensity of electric field at the center of the square is found to be $5.1\times {10}^3$ N/C. Find the value of q?

Q.

Calculate the current in a circuit if 500C of charge passes in 10min.

1. 0.833A

2. 5 A

3. 4.65A

4. None of these.

Q.

Are voltage and resistance directly proportional?

1. True
2. False

Q.

What do you mean by elementary charge? What is its charge? What is the SI unit of current? [3 MARKS]

Q.

A bulb is rated at 220 V, 200 W. What is its resistance?

Q. A steady current is passing through a linear conductor of non uniform cross- section. The net quantity of charge crossing any cross section per second is?

1. Independent of area of cross - section.
2. Directly proportional to the length of the conductor.
3. Directly proportional to the area of cross section..
4. Inversely proportional to the length of the conductor.

Q.

What is the noun form of the word free?

Q.

A TV set shoots out a beam of electrons. The beam current is 10 $\mu$A. How many electrons strike the TV screen in each second? How much charge strikes the screen in a minute? [3 MARKS]

Q.

What constitute electricity?

Q.

The color of livewire is:

1. Red

2. Black

3. Green

4. Blue

Q.

A current of 5 A exists in a 10 $\Omega$ resistance for 4 minutes. The charges that pass through any cross-section of the resistor in this time equals __ C.

Q.

State the law of combination of resistances in series?

Q. A potential difference V is applied across a conductor of length L and diameter d. How is the resistance of the conductor affected when you turn 1)V is halfed2) L is halved and 3)D is doubled justify your answer in each case