### Breaking News Chapter 14 MCQs Test..
Electricity and magnetism
Total marks = 30
Time allowed 40 minutes
Punjab college Shakargarh
* Required
1. A cross on a paper represents current *
1 point
Out of the page
None of them

2. Two parallel straight wires carrying current in same direction *
1 point
Repel each other
Attract each other
Have no effect upon each other

3. Magnetic induction is also called *
1 point
Magnetic flux
Magnetic force
Magnetic flux density
All of them

4. Unit of magnetic induction is *
1 point
Weber
Weber meter
Tesla meter
N/Am

5. If B = 2i - 3j and A = 4 k then value of flux will be *
1 point
8 weber
-12 weber
6 weber
Zero weber

6. If 0.5 T field over area of 2 meter square which lies at an angle of 60 degree with field. The the resultant flux will be *
1 point
0.50 T
0.50 weber
0.25 T
0.25 weber

7. At what angle flux will be half of its maximum value ?? *
1 point
30 degree
45 degree
60 degree
90 degree

8. When surface area is held perpendicular to field lines.. then value of flux will be *
1 point
Maximum
Minimum
Half of its maximum value
1/4 of its maximum value

9. If the numbers of turns become double but length remain same, then magnetic field in the solenoid becomes *
1 point
Half
Double
Remains same
Zero

10. Unit of E/B is *
1 point
m/s
m
1/m
T/N

11. When a charge is projected perpendicular to a uniform magnetic field,it's path is *
1 point
Spiral
Helix
Ellipse
Circular

12. Force on a charged particle is zero when projected at angle with the magnetic field *
1 point
0 degree
90 degree
60 degree
270 degree

13. Work done on a charge particle moving in uniform magnetic field is *
1 point
Maximum
Zero
Minimum
Negative

14. The e/m of a neutron is *
1 point
Less than Electron
Greater than Electron
Zero
The same as proton

15. A magnetic field acts on a charge particle so as to change its *
1 point
Speed
Energy
Direction of motion
All of these

16. When a charge particle moves in magnetic field it's K.E *
1 point
Become zero
Remains constant
Increases 2 times
Increases 4 times

17. If a charge is at rest in a magnetic field then force on charge is *
1 point
Zero
qvB
qvB/2
qvBcos

18. The value of e/m is smallest for *
1 point
Proton
Electron
Alpha particle
Positrons

19. An electron enter the magnetic field at right angle from left, B is into paper. The electron will be deflected *
1 point
Upward
Towards right
Downword
Towards left

20. The brightness of CRO is controlled by *
1 point
Anodes
Cathodes
Grid
Plates

21. In CRo the time base generator circuit is connected to the *
1 point
X-Plates
Y-plates
Annodes
Grid

22. Cathodes ray oscilloscope works by deflecting a beam of *
1 point
Neutrons
Protons
Electrons
Positrons

23. A current carrying coil placed in uniform magnetic field experience maximum torque when angle between plane of coil and magnetic field is *
1 point
0 degree
45 degree
60 degree
90 degree

24. Ampere law is the magnetic equivalent of *
1 point
Lenz law
Gauss law
None of them

25. For a current carrying solenoid the term "n" has unit as *
1 point
No unit
meter
1/ meter
Newton

26. If current flowing through a solenoid becomes four times, then magnetic field inside solenoid becomes *
1 point
Two times
Three times
Four times
Half

27. In e/m ratio, which gas is used to find the visible path of electrons *
1 point
Neon
Hydrogen
Helium
Bromine

28. Digital version of AVO meter is called a *
1 point
Digital ohmmeter
Digital voltmeter
Digital ammeter
Digital multimeter

29. If a charge is at rest it has *
1 point
E = 0 , B = 0
E = 0 , B is not equal to zero
E is not equal to zero , B = 0
One one is correct

30. In a velocity selector alpha particle enter in a field of E = 300 V/m and B = 0.20 T, it will move un-deviated if it moves with velocity *
1 point
1000 m/s
1200 m/s
1500 m/s
1600 m/s

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