- AA potentiometer.
- BA hot-wire voltmeter.
- CA moving-coil galvanometer.
- DA moving-magnet galvanometer.
Explanation:
The AC voltae across a resustance can be measured using a hot-wore volmeter.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere
|
(a) ~ 1.2 × 1012 m–3 |
(b) ~ 106 m–3 |
(c) ~ 1014 m–3 |
(d) ~ 1022 m–3 |
Assertion : A P-N photodiode is made from a semiconductor for which Eg = 2.8 eV. This photo diode will not detect the wavelength of 6000 nm.
Reason : A PN photodiode detect wavelength l if .
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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. |
Focal length of a converging lens in air is R. If it is dipped in water of refractive index 1.33, then its focal length will be around (Refractive index of lens material is 1.5)
|
(a) R |
(b) 2R |
(c) 4R |
(d) R / 2 |
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 resistances are
|
(a) 1 : 3 : 5 |
(b) 5 : 3 : 1 |
(c) 1 : 15 : 125 |
(d) 125 : 15 : 1 |
$\lambda_\text{a}>\lambda_\text{f}$
$\lambda_\text{a}=\lambda_\text{f}$
$\lambda_\text{a}<\lambda_\text{f}$
A gate in which all the inputs must be low to get a high output is called
|
(a) A NAND gate |
(b) An inverter |
(c) A NOR gate |
(d) An AND gate |
The band spectra (characteristic of molecular species) is due to emission of radiation
|
(a) Gaseous state |
(b) Liquid state |
(c) Solid state |
(d) All of three states |
A man is looking at a small object placed at his near point. Without altering the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is: