MCQ
The antiparticle of electron is:
- APositron.
- B$\alpha - \text{particle}.$
- CProton.
- D$\beta - \text{particle}.$
✓
Answer
- Positron.
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 lens of power + 2 diopters is placed in contact with a lens of power – 1 diopoter. The combination will behave like
|
(a) A divergent lens of focal length 50 cm |
|
(b) A convergent lens of focal length 50 cm |
|
(c) A convergent lens of focal length 100 cm |
|
(d) A divergent lens of focal length 100 cm |
A diver at a depth of 12m in water (μ = 4/3) sees the sky in a cone of semi-vertical angle
|
(a) |
(b) |
(c) |
(d) 90° |
Usually the mirror installed in front of the motor driver's seat is:
Assertion : De-morgan's theorem 
may be explained by the following circuit
Reason : In the following circuit, for output inputs ABC are 101
|
(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 mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times
|
(a) |
(b) 4 |
(c) 2 |
(d) 8 |
For measuring voltage of any circuit, potentiometer is preferred to voltmeter because:
During a nuclear fission reaction:
A heavy stone is thrown from a cliff of height h with a speed $\nu.$ The stone will hit the ground with maximum speed if it is thrown:
→- Vertically downward.
- Vertically upward.
- Horizontally.
- The speed does not depend on the initial direction.
Nuclear forces are
|
(a) Short ranged attractive and charge independent |
|
(b) Short ranged attractive and charge dependent |
|
(c) Long ranged repulsive and charge independent |
|
(d) Long ranged repulsive and charge dependent |
Flux associated to a coil at any instant $t$ is $\phi=10 r^2$ $50 t+250$, then induced emf at $t =3$ is :
→