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Recently Added Questions
A light bulb working on an 18 V battery draws a current of 3 A. What will be the resistance of the bulb?
1.0K 0 64c3967e29beb3482a3bcc75- 16 Ωtrue
- 22 Ωfalse
- 34 Ωfalse
- 43 Ωfalse
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Answer : 1 6 Ω
Explanation :
An electric bulb running on 18 V battery draws 3A of electric current. The resistance of the bulb will be 6 Ω.
In which year did Albert Einstein predict a new state of matter, the Bose-Einstein condensate (BEC), based on a quantum formulation by the Indian physicist Satyendra Nath Bose?
569 0 64c38ae6bd3d254806859ebd- 11935false
- 21924true
- 31930false
- 41919false
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Answer : 2 1924
Explanation :
1. In which year did Albert Einstein predict a new state of matter, Bose-Einstein condensate (BEC) in 1924, based on the quantum formulation given by Indian physicist Satyendra Nath Bose?
2. Bose–Einstein condensate (BEC) is a state of matter in which a group of boson particles are in the same quantum state.
Which scientist suggested that the magnet must exert an equal and opposite force on the current-carrying conductor?
638 0 64c24b4aa919c8488e0dbe6a- 1Michael Faradayfalse
- 2Andre Marie Amperetrue
- 3Joseph Henryfalse
- 4William Gilbertfalse
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Answer : 2 Andre Marie Ampere
Explanation :
1. French scientist Andre-Marie Ampère suggested that a magnet should also exert an equal and opposite force on a current-carrying conductor.
2. A current-carrying wire has its own magnetic field.
3. A current-carrying wire attracts a magnetic material like a normal bar magnet.
4. When the current is withdrawn or the switch is closed, there is no magnetic effect in that case.
5. This phenomenon was called the magnetic effect of current.
- 1The resistance of a wire depends on the length and density of the wire.false
- 2Specific resistance is the same for all conductors.false
- 3Resistance of a wire depends on the length and cross-section of the wire.true
- 4Specific resistance is dependent on the cross-sectional area of the wire.false
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Answer : 3 Resistance of a wire depends on the length and cross-section of the wire.
Explanation :
1. Resistance of a wire depends on the length and cross-section of the wire.
Mechanical energy is the sum of potential energy and ______ energy.
531 0 64c22eccd3a6d4481eebda27- 1kinetictrue
- 2heatfalse
- 3electricalfalse
- 4chemicalfalse
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Answer : 1 kinetic
Explanation :
1. Mechanical energy is a combination of kinetic energy and potential energy.
2. Mechanical energy is defined as the sum of kinetic energy and potential energy used to do work on an object.
3. Mechanical energy is the form of energy that is related to the position and motion of an object.