MCQ
What is the unit for EMF?
- AAmpere
- BPotential
- CWatt
- DVolt
✓
Answer
- Volt
Explanation:
EMF is defined as the voltage developed by the electrical energy source. For example : Battery Thus EMF has the unit of volt denoted by V
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
The angular momentum of the α−particles which are scattered through large angles by the heavier nuclei, is conserved because:
According to Bohr's theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be
|
(a) 2πh |
(b) πh |
(c) |
(d) |
Magnetic field produced at the center of a circular coil due to current flowing in it is $B _0$. On axial point of same coil, a point at a distance equal to its radius is B , then the ratio $\frac{ B _0}{B}$ is :
→A solenoid has 2000 turns wound over a length of 0.30 metre. The area of its cross-section is 1.2 
. Around its central section, a coil of 300 turns is wound. If an initial current of 2 A in the solenoid is reversed in 0.25 sec, then the e.m.f. induced in the coil is
|
(a) 6 |
(b) 4.8 |
(c) 6 |
(d) 48 mV |
The molecules having permanent electric dipole moment even in the absence of electric field are called as:
Which of the following statement(s) is/are true about holes?
Two conductors made of the same material are connected across a common potential difference. Conductor A has twice the diameter and twice the length of conductor B. The power delivered to the two conductors 
and 
respectively is such that 
equals to
|
(a) 0.5 |
(b) 1.0 |
(c) 1.5 |
(d) 2.0 |
Two parallel, long wires carry currents i1 and i2 with i1 > i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is $10 \mu\text{T}.$ If the direction of i2 is reversed, the field becomes $30 \mu\text{T}.$ The ratio $\frac{\text{i}_1}{\text{i}_2}$ is:
→- 4
- 3
- 2
- 1
A battery of internal resistance 4W is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be
|
(a) 4/9 |
(b) 8/9 |
(c) 2 |
(d) 18 |
The capacity of a parallel plate condenser is 10 μF, when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm, then the capacity of this parallel plate condenser will be
|
(a) 5 μF |
(b) 10 μF |
(c) 20 μF |
(d) 40 μF |