- AIt converts chemical energy to electrical energy.
- BIt converts electric energy to chemical energy.
- CIt converts chemical energy to thermal energy.
- DIt does not maintain the flow of charge in a circuit.
Explanation:
An electrochemical cell is a device which converts chemical energy to electric energy, and maintains the flow of charge in a circuit. There are 2 types of electrochemical cells – Galvanic cell and Electrolytic cell.
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If the magnetic flux is expressed in weber, then magnetic induction can be expressed in
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(a) Weber/m2 |
(b) Weber/m |
(c) Weber-m |
(d) Weber-m2 |
Assertion :
from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason : The energetics b-particles emitted in the decay of
damage the bone marrow.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
When a white light passes through a hollow prism, then
|
(a) There is no dispersion and no deviation |
(b) Dispersion but no deviation |
|
(c) Deviation but no dispersion |
(d) There is dispersion and deviation both |
A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is

|
(a) d/2 |
(b) d |
(c) 2d |
(d) 3d |
$\alpha<\beta$
$\alpha<\beta \text{ if}\text{ A}<\text{B}$
$\alpha<\beta \text{ if}\text{ A}>\text{B}$
$\alpha<\beta \text{ if}\text{ A}=\text{B}$
A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is
|
(a) 2.0 |
(b) 2.5 |
(c) 1.6 |
(d) 1.5 |
According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to
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(a) ρ |
(b) |
(c) |
(d) |