Subject

Physics

Class

ICSE Class 10

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
Advertisement

 Multiple Choice QuestionsLong Answer Type

Advertisement

41.

Three resistors are connected to a 12 V battery as shown in the figure given below:

i) What is the current through the 8 ohm resistor?
ii) What is the potential difference across the parallel combination of 6 ohm and 12 ohm resistor?
iii) What is the current through the 6 ohm resistor?


Here, 12 ohm and 6 ohm resistors are connected in parallel.

Therefore, their effective resistance, fraction numerator 12 cross times 6 over denominator 12 plus 6 space end fraction space equals space 72 over 18 equals 4 straight capital omega 
Total resistance of the circuit = 8+4 = 12

i) Current drawn = E over R equals 12 over 12 equals 1 space A
That is, current through the 8 om resistor = 1 A

ii) P.D. across the 8 ohm resistor = I  R = 1  = 8 V

P.D. across the parallel combination of resistors = 12 – 8 = 4 V

Because, the resistances are in parallel and they have the same P.D. each.

That is equal to 4 V.

iii) Current through the 6 ohm resistor =Error converting from MathML to accessible text.

676 Views

Advertisement
42.

Two bulbs are marked 100 W, 220 V, and 60 W, 110 W. Calculate the ratio of their resistances.

416 Views

43.

i) What is the color code for the insulation on the earth wire

ii) Write an expression for calculating electrical power in terms of current and resistance.  
410 Views

44.

i) Name a device which is commonly used to convert an electrical signal into a visual signal.

ii) The nucleus straight X presubscript 84 presuperscript 202 emits an alpha particle and forms the nucleus Y. Represent this change in the form of an equation.

iii) What changes will take place in the mass number and atomic number of the nucleus Y if it emits gamma radiations?
458 Views

Advertisement
Advertisement