OCR Physics A Level - Imaging and Signalling

Quiz
•
Physics
•
11th - 12th Grade
•
Hard

Dan Hopton
Used 30+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The moon in this image (Iapetus) is 3900 pixels across and has a real world diameter of 1470 km. What is the resolution of the image?
380 m px-1
376 km px-1
0.380 m px-1
380 km px-1
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
A song is recorded with a sample rate of 44100 Hz with 16 bits per sample for each of the two stereo channels. Calculate the rate, in bytes per second, at which data is processed.
1411200 bytes s-1
176400 bytes s-1
88200 bytes s-1
85600 bytes s-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The highest frequency in a film soundtrack is 6.0 kHz. The soundtrack is to be sampled and digitised. What should be the minimum sample rate?
24 kHz
3 kHz
6 kHz
12 kHz
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
An ultrasound scanner produces waves of frequency 2.5 MHz and speed 1500 ms-1. What is the wavelength?
6 x 10-4 m
0.0017 m
600 m
1.7 m
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The curvature of waves is -0.4 D before a lens and 0.8 D after the same lens. What is the focal length of the lens?
0.4 m
1.2 m
0.83 m
2.5 m
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Information is transferred at a rate of 2 Mbyte s–1.
Calculate the time taken to transfer 6 Gbits at this rate to the correct s.f.
375 s
3000 s
0.3 s
400 s
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Light from an unpolarised light source is passed through a polarising filter. The filter is rotated by 180 degrees. What happens.
The brightness reduces.
The brightness increases.
The brightness stays the same.
The light goes out.
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