- ASilver
- BCopper
- CNichrome
- DGermanium
Explanation:
Alloys have high resistivity. The resistivity of nichrome has weak temperature dependence. At absolute zero, a pure metal has negligibly small resistivity while an alloy like nichrome has some residual resistivity.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Light of frequency 8
is incident on a substance of photoelectric work function 6.125eV. The maximum kinetic energy of the emitted photoelectrons is
|
(a) 17eV |
(b) 22eV |
(c) 27eV |
(d) 37eV |
0.2 Fcapacitor is charged to 600 V by a battery. On removing the battery, it is connected with another parallel plate condenser of 1F. The potential decreases to
|
(a) 100 volts |
(b) 120 volts |
(c) 300 volts |
(d) 600 volts |
A total charge Q is broken in two parts
and
and they are placed at a distance R from each other. The maximum force of repulsion between them will occur, when
|
(a) |
(b) |
|
(c) |
(d) |
In a radioactive substance at t = 0, the number of atoms is 8
. Its half life period is 3 years. The number of atoms 1
will remain after interva
|
(a) 9 yearss |
(b) 8 years |
(c) 6 years |
(d) 24 years |
A soap bubble is given a negative charge, then its radius
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Nothing can be predicted as information is insufficient |
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6
, the charge on it and excess number of electrons on the particle are respectively (g = ![]()
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
The figure gives the electric potential V as a function of distance through five regions on x-axis. Which of the following is true for the electric field E in these regions

|
(a) |
(b) |
|
(c) |
(d) |
An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is
|
(a) 18 |
(b) 20 |
(c) 0.1 |
(d) 10 |