Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 16

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$V - i$ graph for an ohmic resistance is

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Important Questions on Current Electricity

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 17

When a resistance wire is passed through a die the cross-section area decreases by

1 %

, the change in resistance of the wire is

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 18

When the resistance of copper wire is

0.1 Ω

and the radius is

1 mm

, then the length of the wire is (specific resistance of copper is

3.14 \times 10^{- 8} ohm m

),

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 19

Three copper wires have lengths and cross-sectional areas as

(l, A), (2 l, \frac{A}{2})

and

(\frac{l}{2}, 2 A)

. Resistance is minimum in

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 20

The resistance of a wire of cross-section

a

and length

l

is

R

ohm. The resistance of another wire of the same material and of the same length but cross-section

4 a

will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 21

The resistance of wire is

R

ohm. The wire is stretched to half of its diameter. The resistance of the wire will now be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 22

If a wire of resistance

R

is stretched to double of its length, then the new resistance will be

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 23

All the edges of a block in cuboidal shape with parallel faces are unequal. Its longest edge is twice its shortest edge. The ratio of the maximum to minimum resistance between parallel faces is: $(a > b > c)$

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Alpha Question Bank for Medical: Physics>Chapter 24 - Current Electricity>Exercise-1>Q 24

Read the following statements carefully
$Y$ : The resistivity of semiconductors decreases with an increase in temperature.

Z

: In a conducting solid, the rate of collisions between free electrons and ions increases with an increase of temperature.
Select the correct statement (s) from the following