
Class 12th Physics

Quiz
•
Mathematics
•
9th Grade
•
Hard
work account
Used 11+ times
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14 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A proton, a deutron and an alpha particle with the same kinetic energy enter a region of uniform magnetic field, moving at right angles to B. The radii of their circular paths are in the ratio :
(a) 1: 1 :1
(b) 1 :√2:1
(c) 1 : √2: √2
1 : √2: 2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A charged particle of mass m and charge q enters a magnetic field B with a velocity v at an angle θ with the direction of B. The radius of the resulting path is
mnsinθ/qB
mn/qBsinθ
mv/qB
mvtanθ/qB
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A positively charged particle with charge q is moving in a uniform electromagnetic field. Electric and magnetic field are along same direction. If angle between the fields and initial direction of motion is θ= π/2, then its path will be
(a) helical with increasing pitch and constant time period
(b) helical with increasing pitch and decreasing time period
(c) helical with constant pitch and time period
(d) helical with increasing pitch and time period
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 0.5 m long straight wire in which a current of 1.2A is kept at right angle to a uniform magnetic field of 2.0 tesla. The force acting on the wire will be
(a) 2N
(b) 2.4N
(c) 1.2N
(d) 3N
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
A ring of charge Q and radius R is revolved about an axis passing through its centre and perpendicular to plane with angular velocity ω. Magnetic induction at centre of ring is
(a) 0
(b) μ0Qω/2πR
(c) μ0Qω/4πR
(d) μ0QωR/2π
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The magnetic force on a charged particle is always perpendicular to its velocity
(a) the magnetic force can change the velocity of the particle
(b) the magnetic force can change the speed of the particle
(c) the magnetic force can change both
(d) the magnetic force can change neither.
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A deuteron moving along the x-y plane in a uniform magnetic field experiences a force in the – ve z direction. If it moved along the positive z direction, the force acting on it -
(a) would be zero
(b) could be along y-axis
(c) would be along x - axis
(d) none
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