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Published on: 27/05/2021
CBSE 12th Standard Physics Subject Current Electricity HOT Questions 2 Mark Questions 2021
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Questions + Answers key
Take MCQ Physics Test
1.
Three resistance 3Ω, 6Ω and 9Ω are connected to a battery. In which of them will the power dissipation be maximum if
a) They are all connected in parallel
b) They are all connected in series Give reason.
2.
AB is a potentiometer wire as shown in figure. If the value of R is increased, in which direction will the balance point J shift?
3.
Use Kirchhoff's rules to determine the potential difference between the points A and D. When no current flows in the arm BE of the electric network shown in the figure below.
4.
when is more power delivered to a light bulb, just after it is turned on and the glow of the filament is increasing or after it has been ON for a few seconds and the glow is steady?
1.
a) in parallel, power dissipation \(\alpha\) 1/R
Therefore 3\(\Omega \) wire will dissipate more power
b) In series, power dissipation \(\alpha\) R
Therefore 9\(\Omega \) wire will dissipate more power
2.
As, the value of R is increased, the current flowing in the circuit will decrease. And the potential gradient, i.e. potential drop per unit length also decreases, so that the balance length will increase. Thus, J will shift towards B.
3.
Applying Kirchhoff's loop rule for loop ABEFA
6 + 3 + R1 \(\times\) 0 - 3I1 + 1 - 2I1 = 0
or 10 - 5I1 = 0
or I1 = 2A
For loop BCDEB,
4 - I1 . R + R1 \(\times\) 0 - 3 = 0
or 1 - 2R = 0
\(\therefore \quad R=\frac{1}{2} \Omega\)
Potential difference between A and D through path
ABCD is 6 + 4 - I1 R = VAD \(\Rightarrow \quad 10-2 \times \frac{1}{2}=V_{A D}\)
\(\therefore\) VAD = 9 V
4.
When the bulb is turned ON, the resistance of the filament is low, the current is high and a relatively large amount of power is delivered to the bulb.
As the filament warm up, its resistance increases and the current decreases. As a result, power delivered to bulb decreases.
12th Standard CBSE Syllabus & Materials
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