- ATelescope
- BMicroscope
- CElectroscope
- DNone of the above
Explanation:
Electroscope is a device that is used for detection and identification of charge on objects.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
An electron is moving in electric field and magnetic field it will gain energy from
|
(a) Electric field |
(b) Magnetic field |
(c) Both of these |
(d) None of these |
The plates of a parallel plate capacitor of capacity 50 μC are charged to a potential of 100 volts and then separated from each other so that the distance between them is doubled. How much is the energy spent in doing so
|
(a) 25 |
(b) -12.5 |
(c) -25 |
(d) 12.5 |
Assertion : In high latitude one sees colourful curtains of light hanging down from high altitudes.
Reason : The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
|
(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. |
An equiconvex lens is cut into two halves along (i) XOX¢ and (ii) YOY¢ as shown in the figure. Let f, f ¢, f ¢¢ be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively
Choose the correct statement from the following
|
(a) |
(b) |
(c) |
(d) |
X – rays and γ - rays of the same energies may be distinguished by
|
(a) Their velocity |
(b) Their ionising power |
|
(c) Their intensity |
(d) Method of production |
12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is
|
(a) 4 |
(b) 1 |
(c) 3 |
(d) 2 |