Physics half yearly Question paper 2025
Solution :
Correct Option (d)
Q2. Which statement is NOT correct?
(a) q=ne where n is integer
(b) Total charge of an isolated system conserved
(c) Only non-metallic bodies can be charged by rubbing
(d) Metallic and non-metallic bodies both can be charged on rubbing
Solution :
Correct option (c)
Explanation : (a) q=ne where n is integer
— correct (charge quantization).
(b) Total charge of an isolated system conserved
— correct (charge conservation).
(c) Only non-metallic bodies can be charged by rubbing
— NOT correct (metals can also gain/lose electrons when rubbed, though charges distribute differently).
(d) Metallic and non-metallic bodies both can be charged on rubbing — correct.
Solution :
Correct Option (a)
Q4. Which of the following is a non-ohmic conductor?
(a) Aluminum
(b) Copper
(c) Iron
(d) Germanium
Explanation:
- Ohmic conductors obey Ohm’s Law → V∝I
- Non-ohmic conductors do not obey Ohm’s Law — e.g., semiconductors, diodes, etc.
- Answer: (d) Germanium
Physics half yearly Question paper 2025:Class 12 Best pdf
Q5.
A uniform magnetic field exists along positive z-axis. An electron is given an impulsive force along positive x-axis. The electron will…
(a) Move along a straight line along +x-axis
(b) Move along a circular path in XY plane
(c) Move along a circular path in XZ plane
(d) Move along a straight line along −x-axis
Answer:
Explanation:
Answer: (b) Move along a circular path in XY plane
Q6. Which of the following does NOT exhibit diamagnetism?
(a) Bismuth
(b) Lead
(c) Calcium
(d) Mercury cooled to 4.2 K
Explanation:
- Bismuth → diamagnetic
- Lead → diamagnetic
- Mercury (at 4.2 K) → becomes superconductor, hence perfect diamagnet
- Calcium → paramagnetic, not diamagnetic
Answer: (c) Calcium
Answer key :
| 1 | d |
| 2 | c |
| 3 | a |
| 4 | d |
| 5 | b |
| 6 | c |
| 7 | a |
| 8 | d |
| 9 | c |
| 10 | d |
| 11 | b |
| 12 | a |
| 13 | c |
| 14 | a |
| 15 | b |
| 16 | a |
Read Also : Physics hand written notes
