Series Combination

Q.

Two coils have a combined resistance of 25 ohms, when connected in series and a resistance of 4 ohms when connected in parallel. What is the resistance of each coil?

Q. Two identical p-n junction may be connected in series with a battery in three ways as shown in the adjoining figure. The potential drop across the p-n junctions are equal in

1. circuit 3 and circuit 1
2. circuit 1 only
3. circuit 1 and circuit 2
4. circuit 2 and circuit 3

Q. Across which resistors in the following circuit the potential difference is minimum?

नीचे दिए गए परिपथ में किस प्रतिरोधक में विभवान्तर न्यूनतम होता है?

1. 3 Ω alone
   
   केवल 3 Ω
2. 2 Ω and 3 Ω
   
   2 Ω तथा 3 Ω
3. 6 Ω and 9 Ω
   
   6 Ω तथा 9 Ω
4. 9 Ω and 2 Ω
   
   9 Ω तथा 2 Ω

Q.

Which of the following components will be in parallel?

1. $R_1$ AND $R_2$ ONLY

2. $R_1$ AND V ONLY

3. $R_2$AND V ONLY

4. $R_1$, $R_2$ AND V

Q. Three capacitors of equal capacitance when
connected in series have a net capacitance of G.
When connected in parallel they have a capacitance of C2.
What is the value of C1/C2?

Q. Give three characteristics of a series circuit.
[3 MARKS]

Q. The potential difference across all the resistors connected in parallel in a circuit ______.

1. varies
2. remains same
3. is infinite
4. is zero

Q. The potential difference across all the resistors connected in parallel in a circuit ______.

1. varies
2. remains same
3. is infinite
4. is zero

Q. In the following circuit, calculate the electric current shown in ammeter, flowing through the $20.5\Omega$ resistor.

1. 
   3.66
2. 
   0.3661
3. 
   0.366
4. 
   0.36605

Q. The voltage across all the resistances connected in parallel will

1. constantly vary
2. remain the same
3. be infinite
4. drop to zero

Q. The equivalent resistance due to series connection of 10 Ω and 10 Ω resistor is ....

1. 0$\Omega$
2. 5$\Omega$
3. 10$\Omega$
4. 20$\Omega$

Q.

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series?

1. Battery and Voltmeter

2. Ammeter and Rheostat

3. Rheostat and Voltmeter

4. Ammeter and Voltmeter

Q. Eleven $15\Omega$ and four $7\Omega$ resistors are connected in series. If a new resistance of $21\Omega$ is added in series, the change in the effective resistance would be:

1. 
   $21\Omega$
2. 
   $193\Omega$
3. 
   $234\Omega$
4. 
   $15\Omega$

Q. Consider the following statements:

1. In series connection, same current flows through each element in the circuit.

2. In parallel connection, the same potential difference is present across each element in the circuit.

1. Both the statements are correct.
2. Statement 2 is correct but statement 1 is incorrect.
3. Statement 1 is correct but statement 2 is incorrect.
4. Both the statements are incorrect.

Q. Six equal resistance of $1\Omega$ each are connceted to form the sides of a hexagon ABCDEF. Calculate the resistance offered by the combination if the current enters at A and leaves at D.

1. $1\Omega$
2. $1.5\Omega$
3. $2\Omega$
4. $2.5\Omega$

Q.

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series?

1. Rheostat and Voltmeter

2. Battery and Voltmeter

3. Ammeter and Voltmeter

4. Ammeter and Rheostat

Q. The voltage across all the resistances connected in parallel will

1. drop to zero
2. be infinite
3. constantly vary
4. remain the same

Q. In a circuit with resistors in series, which of the following is the same across each resistor?

1. Current
2. Voltage
3. Resistance
4. Resistivity

Q. The circuits having only one path for electricity to flow, are known as

1. parallel circuits
2. series circuits
3. domestic circuits
4. open circuits

Q.

The equivalent resistance between the points A & B in the circuit is:

1. $R_1+R_2+R_3$
2. $R_1+R_3$
3. $R_1+R_2$
4. $R_2+R_3$

Q. In an electrical circuit, ammeter is always connected in ____ with the load or the circuit.

1. parallel
2. neither parallel nor series
3. parallel or series
4. series