Circuit diagram & commonly used symbols

Q. What is the SI unit of conductance?

Q.

What is the half deflection method?

Q.

What is a rheostat?

Q. A reverse bias pn junction diode has:

1. The current in the reverse biased condition is generally very small
2. The forward biased current is very small in comparison to reverse biased current
3. The reverse biased current is strongly dependent on the applied bias voltage
4. The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage

Q.

A resistance of an ideal ammeter is

1. zero

2. high

3. low

4. infinite

Q. Current flows through a diode in forward bias but current flow is negligible in reverse bias.

1. True
2. False

Q.

The purpose of a rheostat is

1. to increase the magnitude of the current only.

2. Decrease the magnitude of current only

3. Increase or decrease the magnitude of the current

4. None of these

Q.

plz help to understand these

1) what is the difference between Resistance and resistivity?

2)what is variable resistance and why it is required?

3)what is rheostat?

Q.

A rectangular coil of wire is situated in a constant magnetic field whose magnitude is 0.50T. The coil has an area of $2m^2$. Determine the magnetic flux for the three orientations, $\theta =0^{°},{60}^{°}$ and ${90}^{°}$. Where is the angle between area vector and magnetic field intensity?

Q.

Small current in a circuit is detected by

1. Galvanometer

2. Fleming's left hand rule

3. Voltmeter

4. Solenoid

Q.

When current is plotted against the applied potential, a straight line plot is obtained. Which of the following law is verified?

1. Flemings law

2. Ohms law

3. Faradays law

4. Maxwells law

Q.

What is the symbol for an open switch?

Q.

An electric cell is represented by two vertical lines of ________ lengths.

Q.

What is the rheostat?

Q. Define the electric circuit and electric fuse.

Q. when a point source of monochromatic light is at a distanceof 0.2m from a photo electric cell, the cut-off voltage and the saturation current are 0.6 volt and 18mA respectively.If the same source is placed 0.6m away from the photoelectric cell then find the new stoping potential and saturation current .

Q. What is the difference between sign convention of + and -ve electric field

Q. What does this symbol mean in an electric circuit?

1. resistance
2. capacitace
3. inductance
4. power source

Q. Three coherent source kept along the same line produce intensity $I_0$ each at point P on this line. When $S_1$ and $S_2$ are switched to simultaneously, intensity at point P is ${2I}_0$ Then

1. When $S_1$ and $S_3$ are switched on simultaneously, intensity at point P can be $2I_0$
2. When $S_1$ and $S_3$ are switched on simultaneously, intensity at point P can be 0
3. When all 3 sources switched on simultaneously intensity at Point P can be $I_0$
4. When all 3 sources switched on simultaneously, intensity at point P can be $3I_0$

Q. What is a rheostat?

Q.

Name the instrument used for measuring current.

Q. Write the name of the system/ arrangement that connects different power generating centers and distribution system?

Q.

value of current in the diagram will be

1. 0 mA

2. 10 mA

3. 20 mA

4. 30 mA

Q. State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment on it.

Q. What does this symbol mean in electric circuits?

1. Rheostat
2. Battery
3. capacitor
4. Inductance

Q. What is the source of electric current?

Q. Why do we use symbols in an electrical circuit?

Q. $Matchthefollowing.$

Q. The shorter line in the symbol of a electric cell represents:

1. The positive terminal
2. The negative terminal
3. The direction of current
4. All of these

Q. Symbol denotes

1. Resistance and voltmeter respectively
2. Plug key and switch respectively
3. Load and Key respectively
4. Tapping key and switch respectively