Objective Type Question and Answers On Class 12 Physics Chapter 3 Current Electricity
Questions
1
A galvanometer acting as a volt meter will have with its coil.
Answer:a high resistance in series
2
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
Answer:resistance will be halved and specific resistance will remain uncharged
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4
n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to
Answer:n²R
6
A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :
Answer:20 A
9
In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :
Answer:2/Ω
11
Copper wire is used as connecting wire because :
Answer:copper has low electrical resistivity
12
A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
Answer:2/3 Ω
14
How many different resistances are possible with two equal resistors?
Answer:3
15
The speed at which tjie current travels in a conductor is nearly:
Answer:3 × 104 ms-1
16
The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :
Answer:thermistor
17
In following figure shows currents in a part of electrical circuit, then the value of/(in ampere) is given by :
Answer:0.3 A
18
An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed Will be:
Answer:750 W
19
A uniform w ire connected across a supply produces heat H per second. If wire is cut into three equal parts and all the parts are connected in parallel across the same supply, the heat produced per second will be :
Answer:H/3
Chapters
- Electric Charges & Fields
- Electrostatic potential and capacitance
- Electricity
- Moving charges and magnetism
- Magnetism and matter
- Electromagnetic induction
- Alternating current
- Electromagnetic waves
- Ray optics and optical instruments
- Wave optics
- Dual nature of radiation and matter
- Atoms
- Nuclei
- Semiconductor electronics
- Communication systems
