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Find the true statement....

Find the true statement.

A

Ohm's law is applicable to all conductors of electricity

B

In an electrolyte solution, the electric current is mainly due to the movement of electrons

C

The resistance of an incandescent lamp is lasser when the lamp is switched on

D

The resistance of carbon decreases with the increase of temperature

Text Solution

Verified by Experts

The correct Answer is:
D
The temperature coefficient of the carbon is negative, so the resistance of carbon decreases with the increase of temperature.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-EXERCISE 2
  1. Find the true statement.

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  2. The amount of charge Q passed in time t through a cross-section of a w...

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  3. If the free electron density be n and relaxation time be tau, the elec...

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  4. In the given circuit the equivalent resistance between the points A an...

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  5. A 10 m long wire ofresistance 20 Omega is connected in series with bat...

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  6. A straight conductor of uniform cross-section carries a current I. Let...

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  7. The resistance of a wire R Omega . The wire is stretched to double its...

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  8. Two bars of equal resistivity rho and radius 'r' and '2r' are kept in ...

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  9. Six equal resistances are connected between points P, Q and R as shown...

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  10. A 100 W bulb B(1) and two 60 W bulbs B(2) and B(3), are connected to a...

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  11. In a region 10^(19) prop-particles and 10^(19) protons move to the lef...

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  12. The V-I graph for a good conductor makes angle 40^(@) with V-axis. Her...

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  13. If an increase in length of copper wire is 0.5% due to stretching, the...

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  14. In a neon discharge tube 2.9 xx 10^(18) Ne^(+) ions move to the right ...

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  15. If the resistivity of an alloy is and that of constituent metal is p,...

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  16. In a network as shown in the figure the potential difference across th...

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  17. A wire of lenth L is drawn such that its diameter is reduced to half o...

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  18. In a potentiometer, the null point is received at 7th wire. If now we ...

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  19. In the given circuit, it is observed that the current I is independent...

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  20. The size of a carbon block, having specific resistance. 3.5xx10^(-3)Om...

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