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level: 1/7/2021

Questions and Answers List

Question	Answer
25. Suppose the maximum speed of a string carrying a sinusoidal wave is vs. When the displacement of a point on the string is half its maximum, the speed of the point is: A. vs/2 B. 2vs C. vs/4 D. 3vs/4 E. √3vs/2	E Chapter 16: WAVES – I
An electromagnetic wave is transporting energy in the negative y direction. At one point and one instant the magnetic field is in the positive x direction. The electric field at that point and instant is: A. positive y direction B. negative y direction C. positive z direction D. negative z direction E. negative x direction	D Chapter 33: ELECTROMAGNETIC WAVES
19. An erect object is in front of a convex mirror a distance greater than the focal length. The image is: A. real, inverted, and smaller than the object B. virtual, inverted, and larger than the object C. real, inverted, and larger than the object D. virtual, erect, and smaller than the object E. real, erect, and larger than the object	D Chapter 34: IMAGES
Suppose A = BnCm, where A has dimensions LT, B has dimensions L2T−1, and C has dimensions LT2. Then the exponents n and m have the values: A. 2/3; 1/3 B. 2; 3 C. 4/5; −1/5 D. 1/5; 3/5 E. 1/2; 1/2	D Chapter 1: MEASUREMENT
The light intensity 10 m from a point source is 1000 W/m2. The intensity 100 m from the same source is: A. 1000 W/m2 B. 100 W/m2 C. 10 W/m2 D. 1 W/m2 E. 0.1 W/m2	C Chapter 33: ELECTROMAGNETIC WAVES