# Physics Trivia: MCQ Exam Quiz!

20 Questions | Total Attempts: 78  Settings  .

• 1.
If an object of mass 0.1g and charge -2x10^-6 C start moving with a velocity of 20m/s inside a uniform electric field and the velocity is in the same direction of the electric field, the distance traveled is 20m until the particle was stopped, What is the magnitude of the electric field?
• A.

43

• B.

43000

• C.

50

• D.

50000

• 2.
When a piece of paper is held with one face perpendicular to a uniform electric field the flux through it is 40N.m^2/C when the paper is turned 25 degrees with respect to the electric field the flux through it is
• A.

36

• B.

17

• C.

29

• D.

23

• 3.
Which one of these represents the electric field outside a conducting infinite cylinder of radius R and the distance between the center and the point we wish to find the electric field at it is r ( lambda = Y)
• A.

2Yk/R

• B.

2Yk/r

• C.

Yk/2r

• D.

Yk/2R

• 4.
Points A at (2,6)m B at (8,-3)m E=12i find VA-VB
• A.

-108

• B.

108

• C.

-72

• D.

72

• 5.
A charge of uniform density 3.5nC/m is distributed along a circular arc of angle 60 to find V at the center.
• A.

33

• B.

22

• C.

44

• D.

55

• 6.
Find the energy stored in C1.
• A.

3.53 x 10^-6

• B.

6.65 x 10^-5

• C.

22 x10^-6

• D.

9.93 x 10^-5

• 7.
A wire of radius 1m has an empty area inside it of radius 0.3m if the resistivity of the wire is 1.59 x 10^-8 and its length is 3m find its resistance
• A.

1.7 x 10^-8

• B.

5.3 x 10^-9

• C.

3.1 x 10^-8

• D.

9.3 x 10^-9

• 8.
A battery has an emf of 15v The terminal voltage of the battery is 11.6v when it is delivering 20w of power to a load resistance R find the internal resistance r
• A.

3

• B.

6.37

• C.

1.7

• D.

2

• 9.
Find V across R1
• A.

3.9

• B.

2.8

• C.

3.4

• D.

2.1

• 10.
What is the maximum power that can be generated from an 18 V emf using any combination of a 6-ohm resistor and a 9-ohm resistor?
• A.

90w

• B.

21.6w

• C.

77w

• D.

120w

• 11.
I2 and I3 respectively are
• A.

1.64 , 0.91

• B.

0.91 , 1.64

• C.

2.34, 1.2

• D.

1.2 , 2.34

• 12.
How many time constant must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?
• A.

0.55

• B.

0.3

• C.

0.4

• D.

0.45

• 13.
An electron is accelerated from rest q=1.6 x 10^-19, m=9.11 x 10^-31 through a potential difference of 350v, and enters a magnetic field that is perpendicular to the velocity if the radius is 7.5cm find the magnitude of the magnetic field.
• A.

5.4 X 10^-4 T

• B.

6.4 x 10^-4 T

• C.

7.4 x 10^-4 T

• D.

8.4 x 10^-4 T

• 14.
What value of B should be used in a velocity selector to separate out 2Kev protons if E is fixed at 80kv/m? (q=-1.6 x 10^-19 C)(m=1.67 x 10^-27 Kg)
• A.

0.13

• B.

0.28

• C.

0.07

• D.

0.44

• 15.
A current of 4A is maintained in a single circular loop having a circumference of 80cm, an external magnetic field of 2T is directed so that the angle between the field and the plane of the loop is 20 degrees, find the magnitude of the torque.
• A.

0.4

• B.

0.15

• C.

0.28

• D.

0.7

• 16.
A straight wire length of 8m is bent to form a square. If the current is 20A find the magnitude of the magnetic field at the center of the square.
• A.

2.8 x 10^-6

• B.

4.6 x 10^-6

• C.

11.2 x 10^-6

• D.

1.84 x 10^-5

• 17.
A hollow cylindrical inner radius 1mm, outer radius 3mm conductor carries a current of 80A parallel to its axis this current is uniformly distributed over the cross-section find the magnetic field at point 2mm from the axis.
• A.

6 x 10^-3

• B.

8 x 10^-3

• C.

3 x 10^-3

• D.

5 x 10^-3

• 18.
A solenoid of radius R=1.25cm and length Length 30cm has 300 turns and carries a current of 12 A, calculate the flux through a coil centered on the axis of the solenoid with radius 1cm.
• A.

3.2 x 10^-7 wb

• B.

6.2 x 10^-7 wb

• C.

4.7 x 10^-6 wb

• D.

9.7 x 10^-6 wb

• 19.
A conducting rod length 80cm rotates at an angular rate of 60 revs/s about a pivot of one end a uniform magnetic field of 60 mT is directed perpendicularly to the plane of rotation what is the magnitude of the emf induced between the end of the rod.
• A.

7.2v

• B.

8.6v

• C.

9.4v

• D.

11.8v

• 20.
If B = 1.5 T and v=4.2m/s, R=5-ohm, and the length of the rod are 60cm what is the power generated in the resistor and what is the direction of the induced current.
• A.

2.9 w, clockwise

• B.

2.9 w , counter clockwise

• C.

0.76 w , counter clockwise

• D.

0.76 w , clockwise

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