MCQ
Which group among the following is insulator?
- ASilver, copper, gold
- BPaper, glass, cotton
- CThe human body, wood, iron
- DGlass, copper, paper
✓
Answer
- Paper, glass, cotton
Explanation:
Glass, paper, and cotton are good quality insulators. The rest options contain one or more conducting materials. Silver is the best conductor material available in nature. But it is costly, so it can’t be used in the electricity distribution system.
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
A narrow electron beam passes undeviated through an electric field E = 3 
and an overlapping magnetic field B = 2 
. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
|
(a) 60 m/s |
(b) 10.3 |
(c) 1.5 |
(d) 0.67 |
The mean age of neutron is :
In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have positive potential and points outside S have negative potential. A positive charge, which is free to move, is placed inside S
|
(a) It will remain in equilibrium |
|
(b) It can move inside S, but it cannot cross S |
|
(c) It must cross S at some time |
|
(d) It may move, but will ultimately return to its starting point |
Assertion : In Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason : Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap.
|
(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. |
The cause of the potential barrier in a p-n diode is:
A fisherman is standing on the bank of a lake. To a fish underwater viewing obliquely the man looks:
Phase difference between any two points of a wavefront is
A proton enters in a straight line in a uniform magnetic field along the field direction. How will its path and velocity change?
If half-life of a radioactive atom is 2.3 days, then its decay constant would be
|
(a) 0.1 |
(b) 0.2 |
(c) 0.3 |
(d) 2.3 |
Assertion : Self-inductance is called the inertia of electricity.
Reason : Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked in the coil.
|
(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. |