Free Printable Final Exam - Competitive Review

1.

Which point has a higher potential?

a)

A

b)

B

2.

When the temperature of the conducting material decreases, what happens to its resistivity?

a)

It increases

b)

It decreases

3.

The picture represents two magnets which have south poles facing each other.

a)

True

b)

False

4.

What is the sign of the charge q that, when moving in $-x$ direction in the magnetic field $\vec{\ B}$ that points in $-y$ direction experiences a magnetic force in $-z$ direction

a)

Positive

b)

Negative

5.

A concave lens creates a virtual, smaller image of the object if the object is placed distance s=f from the surface of the lens.

a)

True

b)

False

6.

Consider three positive charges Q placed on an arc of a circle that is centered at the origin. What is the correct expression for x component of the electric field at the origin.

a)

$E_x=\frac{k_eQ}{R^2}\left(1+2\cos\theta\right)$

b)

$E_x=\frac{k_eQ}{R^{2\ }}\left(1+2\sin\theta\right)$

c)

$E_x=\frac{k_eQ}{R^{2\ }}\left(1+\frac{2}{\left(\cos\theta\ \right)^{2\ }}\right)$

d)

$E_x=\frac{k_eQ}{R^{2\ }}\left(1+\frac{2}{\left(\sin\theta\ \right)^{2\ }}\right)$

7.

Which of the regions represents radio waves?

a)

I

b)

II

c)

V

d)

VI

8.

What is the magnetic field at point O due to the wire carrying current I = 0.25 A if $\theta\ =30^o$ and $a=10.0\ \text{\text{cm}}$ ?

a)

0.131 μT

b)

1.57 μT

c)

1.00 μT

d)

1.13 μT

9.

Electrostatic force does work W on a charged particle as it travels from point A to point B in an electric field.
You then apply an external force to move the particle back to A, changing its kinetic energy by 2W.

How much work did you do?

a)

W

b)

2W

c)

3W

d)

4W

10.

Two charges are placed at points x=0 and x=a and potential measured along x axis is plotted on the vertical axis. What is the ratio of the two charges. $\frac{Q_A}{Q_B}?$

a)

3

b)

2

c)

-2

d)

-3

11.

The figure shows a side view of a loop placed in xz plane in magnetic field pointing in +x direction. The loop is symmetric and, due to the forces exerted on its sides, experiences a torque about an axis that passes through its center.
What is the direction of the torque on the loop?

a)

-y

b)

-z

c)

+y

d)

+z

12.

When light of wavelength 600 nm passes through a slit a minimum closest to the central line is observed at an angular position $\theta=4.78^o$ .

What is the width of the slit?

a)

$0.4\ \text{}\mu m$

b)

$14.4\ \text{}\mu m$

c)

$7.2\ \text{}\mu m$

d)

$3.6\ \text{}\mu m$

13.

Light travels from glass (n_glass=1.52) to diamond (n_diamond=2.54) and the angle between the incident ray and the normal to the diamond's surface is 70^o.
What is the angle between the medium boundary and the refracted ray inside the gem?

a)

78.2 degrees

b)

55.8 degrees

c)

34.2 degrees

d)

11.8 degrees

14.

Resistor A has resistance of 50.0 Ω with uncertainty u(R_A)=0.3 Ω. When it is connected in series with another resistor, R_B, the equivalent resistance of the set up is measured to be 75.0 Ω with u(R_eq)=0.4 Ω.
What is the resistance of resistor R_B with uncertainty?

a)

25.0 Ω with uncertainty 0.1 Ω

b)

25.0 Ω with uncertainty 0.7 Ω

c)

150.0 Ω with uncertainty 0.8 Ω

d)

150 Ω with uncertainty 0.1 Ω

15.

What is the equivalent resistance of this circuit?

a)

15.0 Ω

b)

41.0 Ω

c)

3.6 Ω

d)

6.4 Ω

16.

An object is placed in front of a concave mirror, distance 1.5f from its surface (with f being focal length). What is the position of the image?

a)

-3f

b)

-0.6f

c)

0.6f

d)

3f

Final Exam - Competitive Review

Total questions: 16

Worksheet time: 27mins

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