How ‘clear’ Is Your Camera Knowledge?
SDM Magazine February 5-Minute Tech Quiz
- 1.
Cameras are able to do which of the following?
- A.
Recognize a known person.
- B.
Detect a person.
- C.
Identify an unknown person.
- D.
All of the above.
- E.
None of the above.
Correct Answer
D. All of the above.Explanation
Cameras can do all of these based on the size of the image in the viewing area and the analytics available.Rate this question:
-
- 2.
Which of the following camera lens sizes will produce the widest angle image?
- A.
1 in. CCD
- B.
2/3 in. CCD
- C.
1/2 in. CCD
- D.
1/3 in. CCD
Correct Answer
A. 1 in. CCDExplanation
The size of the camera lens determines the angle of view, with larger lenses producing wider angles. Therefore, the 1 in. CCD camera lens will produce the widest angle image compared to the 2/3 in., 1/2 in., and 1/3 in. CCD camera lenses.Rate this question:
-
- 3.
A ______ lens will produce the largest distorted image.
- A.
Wide angle
- B.
Macro
- C.
Zoom
- D.
Fisheye
Correct Answer
D. FisheyeExplanation
A fisheye lens creates a distorted circular image.Rate this question:
-
- 4.
The field of view is ______.
- A.
Also known as the focal length.
- B.
The horizontal and vertical area that the camera is supposed to be seeing.
- C.
Solely dependent upon the size of the camera “chip.”
- D.
Calculated by determining the distance of the imager to the front of the camera lens.
Correct Answer
B. The horizontal and vertical area that the camera is supposed to be seeing.Explanation
The correct answer is "the horizontal and vertical area that the camera is supposed to be seeing." This refers to the extent of the scene that the camera can capture, both horizontally and vertically. It determines the amount of the scene that will be visible in the resulting image or video. The field of view is not the same as the focal length, which is a specific property of the camera lens. It is also not solely dependent upon the size of the camera "chip" or calculated by determining the distance of the imager to the front of the camera lens.Rate this question:
-
- 5.
Professional photography lenses are interchangeable with CCTV designed lenses and produce a better quality image, but the cost is very high.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Professional camera lenses are not interchangeable with CCTV cameras.Rate this question:
-
- 6.
Depth of field is ______.
- A.
The distance between the closest object and the farthest object in view that is in focus.
- B.
Determined by the amount of light entering the lens.
- C.
Not important in determining placement of a camera.
- D.
All of the above
- E.
None of the above
Correct Answer
B. Determined by the amount of light entering the lens.Explanation
Depth of field refers to the range of distance in an image that appears to be in focus. It is determined by various factors, including the aperture setting, focal length, and the distance between the camera and the subject. The amount of light entering the lens, which is controlled by the aperture setting, is one of the key factors that determine the depth of field. Therefore, the correct answer is that the depth of field is determined by the amount of light entering the lens.Rate this question:
-
- 7.
The cost of color cameras is so prohibitive that most videos from locations such as convenience stores are black and white.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement suggests that the cost of color cameras is the reason why most videos from places like convenience stores are black and white. However, this is not true. The main reason why videos from these locations are often black and white is because black and white cameras are more commonly used due to their lower cost and simplicity. Color cameras are available and used in many locations, but they are not as prevalent in convenience stores and similar places due to cost considerations.Rate this question:
-
- 8.
When transmitting video over the Internet, which of the follow is true?
- A.
Quality is not affected by the amount of cameras viewed.
- B.
Resolution increases as the frames per second decreases.
- C.
The more cameras, the more bandwidth is needed.
- D.
Cameras cannot be viewed over anything other than an MFVN.
Correct Answer
C. The more cameras, the more bandwidth is needed.Explanation
The more cameras that are being viewed, the more data needs to be transmitted over the Internet. Each camera requires a certain amount of bandwidth to transmit its video feed, so as the number of cameras increases, the overall bandwidth needed also increases. This is because more data needs to be transmitted simultaneously to accommodate the video feeds from multiple cameras. Therefore, the statement "The more cameras, the more bandwidth is needed" is true in the context of transmitting video over the Internet.Rate this question:
-
- 9.
Using a lens with higher quality glass elements will produce better images.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Using a lens with higher quality glass elements can improve the overall image quality. High-quality glass elements are designed to minimize optical aberrations such as distortion, chromatic aberration, and vignetting. They also have better light transmission, resulting in sharper and more detailed images. Additionally, high-quality lenses often have better build quality and advanced coatings that reduce flare and ghosting. Therefore, using a lens with higher quality glass elements can indeed produce better images.Rate this question:
-
- 10.
Cameras are just one component of a complete integrated security solution.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because cameras are not the only aspect of a comprehensive security system. While cameras play a crucial role in capturing and monitoring activities, they need to be integrated with other elements such as alarms, access control systems, and monitoring software to create an effective security solution. These additional components provide enhanced security measures, such as real-time alerts, remote monitoring, and access management, which complement the capabilities of cameras and ensure a comprehensive approach to security.Rate this question:
-
- 11.
Fill in the blanks: ______ lux = ______ footcandles.
- A.
1 / 0.5
- B.
0.5 / 1
- C.
1 / 0.093
- D.
1 /1000
Correct Answer
C. 1 / 0.093Explanation
The correct answer is 1 / 0.093. This is because 1 lux is equal to 0.093 footcandles.Rate this question:
-
- 12.
Which of the following provide the greatest percentage of reflectivity?
- A.
White plaster
- B.
Snow
- C.
A white painted wall
- D.
An aluminum building
Correct Answer
B. SnowExplanation
Snow reflects between 85-95 percent of visible light; aluminum and plaster reflect about 90 percent.Rate this question:
-
- 13.
The following are all types of high-intensity discharge lamps except
- A.
Mercury.
- B.
Xenon.
- C.
Metal-arc.
- D.
Sodium.
- E.
All are high-intensity discharge lamps
- F.
None are high-intensity discharge lamps
Correct Answer
E. All are high-intensity discharge lampsExplanation
The given correct answer is "All are high-intensity discharge lamps." This means that all of the options mentioned in the question (mercury, xenon, metal-arc, and sodium) are types of high-intensity discharge lamps. Therefore, none of them can be excluded as types of high-intensity discharge lamps.Rate this question:
-
- 14.
The Inverse Square Law states that an object
- A.
That is twice the distance from the source will receive half the amount of illumination.
- B.
That is twice the distance from the source will receive one quarter the amount of illumination.
- C.
Double the distance away from a source will receive half the field of view.
- D.
Moved two times the distance away from a light source will receive only half of the available illumination.
Correct Answer
B. That is twice the distance from the source will receive one quarter the amount of illumination.Explanation
The Inverse Square Law states that the intensity of illumination decreases as the distance from the source increases. Specifically, it states that an object that is twice the distance from the source will receive one quarter (1/4) the amount of illumination. This means that the farther the object is from the source, the less light it will receive.Rate this question:
-
- 15.
Calculating field of view and angle of views all require understanding
- A.
Rhombus.
- B.
Squares.
- C.
Triangles.
- D.
Rectangles.
Correct Answer
C. Triangles.Explanation
The Pythagorean theorem is one of the most used formulas in CCTV design.Rate this question:
-
Back to top