Current Electricity, electromotive force, Direct Current, Alternating Current, Generation of Current Electricity.
Explore the electrifying world of current electricity at Nokryan.com, where we delve into the essential concept of electric charge flow that powers our modern world. Uncover the intriguing phenomenon of electromotive force (EMF), the driving factor behind the movement of electric charge in circuits and devices. Join us on Nokryan.com as we shed light on the complexities of current electricity and its significant impact on our interconnected world.
1. When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons ?
- None of these
- Decreasescorrect
- Either of these
- Remains constant
- Increases
2. In order to have a constant current through a wire, the potential difference across its ends should ?
- Be zero
- Go on decreasing
- Both A & D
- Be maintained constantcorrect
- Goes on increasing
3. If the ends of a wire are connected to a battery, an electric fields E will be set up at ?
- The ends of the wire only
- Every point within the wirecorrect
- None of these
- At nodes only
- Mid points of the wire only
4. In case of metallic conductors, the charge carriers are ?
- Electronscorrect
- Both (A) and (B)
- Positrons
- Protons
- Anti protons
5. The charge carries in an electrolyte are ?
- Neither (A) nor (B)
- Negative ions
- Either (A) or (B)
- Positive ions
- Both (A) and (B)correct
6. Most practical applications of electricity involve ?
- Electrons at rest
- Atoms in motion
- Molecules in motion
- Charges in motioncorrect
- Charges at rest
7. The obvious effects of current is/are ?
- Heating effect
- Magnetic effect
- Both B & C
- Chemical effect
- All of the thesecorrect
8. Conversion of chemical energy to electrical energy can be achieved by ?
- Photovoltaic cell
- Secondary cell
- Both A & Bcorrect
- Solar cell
- Primary cell
9. An electric fields is generated along the wire when ?
- Either A & D
- Its resistance is very high
- A constant potential is maintained across the wire
- A constant potential difference is maintained across the wirecorrect
- Net current through the wire is zero
10. The effect of bends in a wire on its electrical resistance are ?
- Zerocorrect
- Much larger
- None of these
- Smaller
- Larger
11. When a constant potential difference is applied across the conductor, the drift velocity of electrons ?
- None of these
- Remains constantcorrect
- Increases
- Either of these
- Decreases
12. As the current flows through the wire ?
- It generates heat in the wirecorrect
- Resistance of the wire decreases
- It produces sound in the wire
- None of these
- Voltage across the ends is increased
13. The term drift velocity is used when the ends of a wire are ?
- Not connected to a voltage source
- At different values of potential
- Connected to a laser source
- Connected to a voltage source
- Both B & Dcorrect
14. When two spherical conducting balls at different potentials are joined by metallic wire, the current starts ?
- Increasing from maximum to zero
- Increasing from zero to maximum
- Both A & D
- Decreasing from zero to maximum
- Decreasing from maximumcorrect
15. The rate at which in the free election pass through any section of a metallic wire from right to left is ?
- Less than the speed at which they pass from left to right
- Any of above
- None of these
- The same at which they pass from left to rightcorrect
- Greater than the speed at which they pass from left to right
16. When two spherical conducting balls at different potentials are joined by a metallic wire, after some time ?
- Both A & Ccorrect
- Potential difference across the conductors becomes zero
- Both the conductors are at the same potential
- Potential difference across the conductors remain constant
- Both A and B
17. The free electrons in metals ?
- None of these
- Move such that their speed does not depend upon temperature
- Move with speed of light
- Are in random motion and their speed depends upon temperaturecorrect
- Move in a particular direction
18. The conventional current is the given to current due t flow of ?
- Negative charges
- Positive chargescorrect
- Both A & C
- Positrons
- None of these
19. The current that flows through the coil of a motor causes ?
- Its brushes to rotate
- Its shaft to revolve
- None of these
- Motor to move
- Its shaft to rotatecorrect
20. A current of I ampere is passing through a conductor. The charge passing through it in half a minute is ?
- 0.5 Coulomb
- One Coulomb
- 2 Coulombs
- 30 Coulombscorrect
- None of these
21. The example/s of non-electrical energy is are ?
- Heat energy
- Chemical energy
- Both A & B
- All of thesecorrect
- Mechanical energy
22. In a metal, the valence electrons are ?
- Both A & B
- Not attached to individual
- Both B & Ccorrect
- Attached to individual atoms
- Free to move within the metal
23. The positive charge moving in one direction is equivalent in all external affects to a ?
- Positive charge moving in the opposite directioncorrect
- None of these
- Negative charge moving in the opposite direction
- Positive charge moving in the same direction
- Negative charge moving in the same direction
24. The device which can convert heat energy into electrical energy is called ?
- Thermostat
- Both C & D
- Thermocouplecorrect
- Thermometer
- Thermistor
25. Heating effect of current is utilized in ?
- Electroplating
- Both B & Dcorrect
- Electric kettle
- Electric motor
- Electric toaster