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

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. 

1. How would you demonstrate that a momentary current can be obtained by the suitable use of a magnet, a coil of wire and a galvanometer?
2. What is the source of energy associated with the current obtained in part (a)?

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.  

1. Describe briefly one way producing an induced e.m.f?
2. State one factor that determines the magnitude of induced e.m.f. in part (a) above.
3. What factor determines the direction of induced e.m.f. in part (a) above?

In which of the following case does the electromagnetic induction occur?

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 conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor.

What is Lenz’s law?

Why does it become more difficult to move a magnet towards a coil when the number of turns in the coil has been increased?

The direction of induced current is obtained by ______.

How is the boiling point of water affected when some salt is added to it?

It is difficult to cook vegetables on hills and mountains. Explain the reason.