English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Give the law of combination of resistances in series.

If five resistances, each of value 0.2 ohm, are connected in series, what will be the resultant resistance?

What possible values of resultant resistance one can get by combining two resistances, one of value 2 ohm and the other 6 ohm?

Calculate the combined resistance in each case: 

A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:

(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor

If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is : 

(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω

The diagram below shows part of a circuit: 

If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
 
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω

What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?

4 Ω, 8 Ω, 12 Ω, 24 Ω 

You are supplied with a number of 100 Ω resistors. How could you combine some of these resistors to make a 250 Ω resistor?

What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?

Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.

State the form of magnetic field lines around a straight current-carrying conductor.

State whether the following statement is true or false:
The magnetic field inside a long circular coil carrying current well be parallel straight lines.

What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?

Fill in the following blank with suitable words: 

For a current-carrying solenoid, the magnetic field is like that of a ...........

Describe how you will locate a current-carrying wire concealed in a wall.

Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.