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1.
Which one among the following is the correct order of power consumption for light of equal intensity?
2.
Two pieces of metallic wire having equal lengths and equal volume placed in air have different resistances. The two wires must
3.
Graphene is frequently in news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
4.
If the electrical resistance of a typical substance suddenly drops to zero then the substance is called
5.
Which one of the following is correct?
Lightning is formed, when
Lightning is formed, when
6.
Consider the following statements:
An ordinary light bulb has a rather short life because the:
1. filament wire is not uniform.
2. bulb cannot be evacuated completely.
3. wires supporting the filament melt at high temperatures.
Which of the above statements are correct?
An ordinary light bulb has a rather short life because the:
1. filament wire is not uniform.
2. bulb cannot be evacuated completely.
3. wires supporting the filament melt at high temperatures.
Which of the above statements are correct?
7.
Consider the following statements regarding a motor car battery:
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?
8.
In which one of the following cases Ohm's law is not valid?
9.
Which one of the statements given below is not correct?
10.
A current I flows through a potential difference V in an electrical circuit containing a resistance R. The product of V and I, i.e., VI may be understood as