Question 511 Mark
What is the value of I in the given current distribution?
Answer
View full question & answer→I + 4 + 2 = 5 + 3
I = 2A
I = 2A
Questions · Page 2 of 2
1 Marks Question
Question 521 Mark
Do the electrodes in an electrolytic cell have fixed polarity like a battery?
Answer
View full question & answer→Yes, polarity of electrolytic cell is fixed.
Question 531 Mark
State the condition under which the terminal pd across a battery and its emf are equal.
Answer
View full question & answer→The terminal pd across a battery is equal to its emf when battery is in open circuit, i.e., when no current is being drawn from the cell.
Question 541 Mark
Would you prefer a voltmeter or a potentiometer to measure the emf of a battery?
Answer
View full question & answer→Because potentiometer doesn't draw any current for itself from the primary circuit and hence gives more accurate measurement thereby acting as an ideal voltmeter. It uses null method to measure.
Question 551 Mark
The I-V characteristics of a resistor are observed to deviate from a straight line for higher values of current as shown in the adjoining figure why?
Answer
View full question & answer→At higher value of current, sufficient heat is produced which raises the temperature of resistor and so causes increase in resistance.
Question 561 Mark
A uniform wire of resistance $50\Omega$ is cut into 5 equal parts. These parts are now connected in parallel. What is the value of equivalent resistance of the combination?
Answer
View full question & answer→2 ohmsa.
Question 571 Mark
Though we specify the direction of direct current by putting an arrow, why is it not considered a vector quantity?
Answer
View full question & answer→Current is a scalar quantity because it does not obey the laws of vector addition.