- AHigh resistance in series with galvanometer.
- BLow resistance in series with galvanometer.
- CHigh resistance in parallel with galvanometer.
- DLow resistance in parallel with galvanometer.
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To draw maximum current from a combination of cells, how should the cells be grouped
|
(a) Series |
|
(b)Parallel |
|
(c) Mixed |
|
(d) Depends upon the relative values of external and internal resistance |
Half lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the sample of A and B have equal number of nuclei. After 80 minutes, the ratio of remaining number of A and B nuclei is
|
(a) 1 : 16 |
(b) 4 : 1 |
(c) 1 : 4 |
(d) 1 : 1 |
Wavelength of light of frequency 100Hz
|
(a) 2 |
(b) 3 |
(c) 4 |
(d) 5 |
Three observers A, B and C measure the speed of light coming from a source to be and
. The observer A moves towards the source, the observer C moves away from the source with the same speed. The observer B stays stationary. the surrounding space is vacuum every where. Then
|
(a) |
(b) |
(c) |
(d) |
When a dielectric material is introduced between the plates of a charges condenser, then electric field between the plates
|
(a) Remain constant |
(b) Decreases |
|
(c) Increases |
(d) First increases then decreases |