NEET Questions - Physics - Current Electricity

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Two wires of equal lengths, equal diameters and having resistivities $ \rho _1 and \rho_2 $ are connected in series .The equivalent resistivity of the combination is....

$ ( \rho_1 + \rho_2) $
$ 1/2( \rho_1 + \rho_2) $
$ \rho_1 \rho_2 \over (\rho_1 + \rho_2) $
$ \sqrt{ \rho_1 \rho_2} $

The effective resistance of a n number of resistors connected in parallel in x ohm. When one of the resistors is removed, the effective resistance becomes y ohm. The resistance of the resistor that is removed is....

$ {xy \over (x+y)} $
$ { xy \over (y-x) }$
$ (y-x)$
$ \sqrt {xy} $

when a cell is connected to a resistance $R_1$ the rate at which heat is generated in it is the same as when the cell is connected to a resistance $R_ 2 < R_1$ the internal resistance of the cell is....

$ (R_ 1 - R_2)$
$ 1/2 (R_1 -R_2)$
$ {R_1R_2 \over (R_1 + R_2)}$
$ \sqrt{ R_1 R_2}$

Two batteries each of emf 2V and internal resistance $1 \Omega $ are connected in series to a resistor R. Maximum Possible power consumed by the resistor = ....

3.2 W
16 / 9 W
8/ 9 W
2 W

In an experiment to measure the internal resistance of a cell by a potentiometer it is found that all the balance points at a length of 2m when the cell is shunted by a 5 ohm resistance and is at a length of 3m when the cell is shunted by a 10 ohm resistance, the internal resistance of the cell is then :

$ 1.5 \Omega $
$ 10 \Omega $
$ 15 \Omega $
$ 1 \Omega $

Two wires of the metal have the same length but their cross-sections are in the ratio 3:1 They are joined in series: The resistance of the thicker wire is $ 10 \Omega $ . The total resistance of the combination will be

40
40/3
5\2
100

The ratio of angular speeds of minute hand and hour hand of a watch is

6 : 1
12 : 1
60 : 1
1 : 60

A wire 50cm long and $1 mm^2$ in cross-section carries a curent of 4A when connected to a 2V battery. The resistivity of the wire is:

$ 2 \times 10^{-7} \Omega m $
$ 5 \times 10^{-7} \Omega m $
$ 4 \times 10^{-6} \Omega m $
$ 1 \times 10^{-6} \Omega m $

A parallel combination of three resistors takes a current of 7.5 A form a 30 V supply, It the two resistors are $ 10 \Omega $ and $ 12 \Omega $. find which is the third one?

$ 4 \Omega $
$ 15 \Omega $
$ 12 \Omega $
$ 22 \Omega $

A potentiometer wire has length 10 mand resistance $ 20 \Omega $. A 2.5V battery of negligible internal resistance is connected across the wire with an $ 80 \Omega $ series resistance. The potential gradient on the

$ 2.5 \times 10^{-4} V/cm $
$ 0.62 \times 10^{-4} V/mm $
$ 1 \times 10^{-5} V/mm $
$ 5 \times 10^{-5} V/mm $

The drift velocity of free electrons through a conducting wire of radius r, carrying current I, is if the same current is passed through a conductor of radius 2r what will be the drift velocity?

$ {V_d \over 4 } $
$ {V_d } $
$ {2V_d} $
$ {24V_d} $

A carbon resistor has a set of coaxial coloured rings in the order brown, violet brown and silver. The value of resistance (in ohms) is.

$ (27 \times 10 ) \pm 5 \%$
$ (27 \times 10 ) \pm 10 \%$
$ (17 \times 10 ) \pm 5 \%$
$ (17 \times 10 ) \pm 10 \%$

A cross a wire of length l and thickness d, a p.d of V is applied. If the p.d is doubled the dirft velocity becomes....

becomes double
becomes half
Close not change
becomes Zero

The masses of three wires of copper are in the ratio of 1:3:5 and their lengths are in the ratio of 5:3:1. The ratio of their electrical resistance is:

1:01:01
1:03:05
5:03:01
125:15:01

Resistivity of material of a conducting wire is $ 4 \times 10^{–8} \Omega m$ volume of the wire is $4m^3$ and its resistance is$ 4 \Omega $ Therefore its length will be.

500m
5000m
20,000m
$4 \times 10^{-5}m$

NEET Physics Questions: Current Electricity