(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

In parallel combination of resistances ______.

Which of the following combinations have the same equivalent resistance between X and Y?

Two resistors having resistance 4𝛀 and 6𝛀 are connected in parallel. Find their equivalent resistance. 

Four resistors each of resistance 2Ω are connected in parallel. What is the effective resistance? 

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is less than 1Ω? Draw diagram and find the total resistance. 

Calculate the equivalent resistance between the points A and B in Fig. if each resistance is 2·0 Ω.

A combination consists of three resistors in series. Four similar sets are connected in parallel. If the resistance of each resistor is 2 ohm, find the resistance of the combination. 

Five resistors, each 3 Ω, are connected as shown in Fig. Calculate the resistance

1. between the points P and Q.
2. between the points X and Y.  

The current induced in a closed circuit only if there is ______.

In the following figure calculate:

1. the total resistance of the circuit
2. the value of R, and
3. the current flowing in R.

A particular resistance wire has a resistance of 3 ohm per meter. Find the total resistance of three lengths of this wire each 1.5 m long, joined in parallel.

A battery of e.m.f 16 V and internal resistance 2 Ω is connected to two resistors 3Ω and 6Ω connected in parallel. Find:

1. the current through the battery.
2. p.d. between the terminals of the battery,
3. the current in 3 Ω resistors,
4. the current in 6 Ω resistor. 

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.

Name and state the principle of a simple a.c. generator. What is its use?

What determines the frequency of a.c. produced in a generator?

Draw a labelled diagram of a simple a.c. generator.

In an a.c. generator the speed at which the coil rotates is doubled. How would this affect

1. the frequency of output voltage,
2. the maximum output voltage is doubled.

Suggest two ways in an a.c. generator to produce a higher e.m.f.

What energy conversion does take place in a generator when it is in use?

State one advantage of using a.c. over d.c.