
- A1
- B2
- C3
- ✓4

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true
|
(a) Potential difference across the terminals of the battery is maximum when R = r |
|
(b) Power delivered to the resistor is maximum when R = r |
|
(c) Current in the circuit is maximum when R = r |
|
(d) Current in the circuit is maximum when R >> r |
Angular width (b) of central maximum of a diffraction pattern on a single slit does not depend upon
|
(a) Distance between slit and source |
(b) Wavelength of light used |
|
(c) Width of the slit |
(d) Frequency of light used |
In an electrolyte 3.2 bivalent positive ions drift to the right per second while 3.6
monovalent negative ions drift to the left per second. Then the current is
|
(a) 1.6 amp to the left |
(b) 1.6 amp to the right |
(c) 0.45 amp to the right |
(d) 0.45 amp to the left |
Missing lines in a continuous spectrum reveal
|
(a) Defects of the observing instrument |
|
(b) Absence of some elements in the light source |
|
(c) Presence in the light source of hot vapours of some elements |
|
(d) Presence of cool vapours of some elements around the light source |
If a source of light is moving away from a stationary observer, then the frequency of light wave appears to change because of
|
(a) Doppler's effect |
(b) Interference |
(c) Diffraction |
(d) None of these |
The current in the adjoining circuit will be
|
(a) |
(b) |
(c) |
(d) |