MCQ
The energy stored per unit volume of a space is called as:
- AEnergy efficiency.
- BEnergy density.
- CElectric field.
- DPolarisation.
✓
Answer
- Energy density.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
|
(a) 6 hours |
(b) 12 hours |
(c) 24 hours |
(d) 128 hours |
Gauss’s law is true only if force due to a charge varies as
|
(a) |
(b) |
(c) |
(d) |
In a parabola spectrograph, the velocities of four positive ions P,Q,R and S are v1, v2, v3 and v4 respectively
|
(a) |
(b) |
|
(c) |
(d) |
Frequency of electric current in alternating current I $=200 \sin \left(60 \pi t+\frac{\pi}{6}\right)$ is :
→A wire of length L metre carrying a current of I ampere is bent in the form of a circle. Its magnitude of magnetic moment will be
|
(a) |
(b) |
(c) |
(d) |
If 
are the lengths of the emitter, base and collector of a transistor then
|
(a) |
(b) |
(c) |
(d) |
Which type of a physical quantity is electric current?
In a semiconductor diode, the barrier potential offers opposition to:
There is a current of 40 ampere in a wire of 
area of cross-section. If the number of free electron per 
is 
, then the drift velocity will be
|
(a) 1.25 × |
(b) 2.50 × |
(c) 25.0 × |
(d) 250 × |
Raman effect shows: