Question # 1 of 5 ( Start time: 09:16:18 PM ) Total Marks: 1
A transverse wave is transporting energy from east to west. The particles of the medium will move_____.
Select correct option:
East to west only
Both eastward and westward
North to south only
Both northward and southward (Correct)
Question # 2 of 5 ( Start time: 09:17:49 PM ) Total Marks: 1
Take the speed of sound to be 340m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:
Select correct option:
moving overhead faster than the speed of sound
emitting a much higher frequency than is heard
emitting a much lower frequency than is heard
about 1000m away (Correct)
Question # 3 of 5 ( Start time: 09:19:00 PM ) Total Marks: 1
A fire whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340m/s. The wavelength of this sound is about:
Select correct option:
3.0m
0.5m
1.0m
2.0m (Correct)
Question # 4 of 5 ( Start time: 09:20:14 PM ) Total Marks: 1
back and forth in a leftward and rightward direction. This type of wave is known as a ____.
Select correct option:
Mechanical
Electromagnetic
Transverse
Longitudinal (Correct)
Question # 5 of 5 ( Start time: 09:21:45 PM ) Total Marks: 1
Young’s modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface of an object to:
Select correct option:
the shear
the fractional change in volume
the fractional change in length (Correct)
the pressure
1. Velocity is defined as:
A. rate of change of position with time
B. position divided by time
C. rate of change of acceleration with time
D. a speeding up or slowing down
E. change of position
2. Acceleration is defined as:
A. rate of change of position with time
B. speed divided by time
C. rate of change of velocity with time
D. a speeding up or slowing down
E. change of velocity
3. Which of the following is a scalar quantity?
A. Speed
B. Velocity
C. Displacement
D. Acceleration
E. None of these
4. Which of the following is a vector quantity?
A. Mass
B. Density
C. Speed
D. Temperature
E. None of these
5. Which of the following is NOT an example of accelerated motion?
A. Vertical component of projectile motion
B. Circular motion at constant speed
C. A swinging pendulum
D. Earth’s motion about sun
E. Horizontal component of projectile motion
6. A particle goes from x = −2m, y =3m, z =1mto x =3m, y = −1m, z = 4m. Its displacement is:
A. (1m)ˆi + (2m)ˆj + (5m) ˆk
B. (5m)ˆi −(4m)ˆj + (3m) ˆk
C. −(5m)ˆi + (4m)ˆj −(3m) ˆk
D. −(1m)ˆi −(2m)ˆj −(5m) ˆk
E. −(5m)ˆi −(2m)ˆj + (3m) ˆk
7. A jet plane in straight horizontal flight passes over your head. When it is directly above you, the sound seems to come from a point behind the plane in a direction 30◦
from the vertical. The speed of the plane is:
A. the same as the speed of sound
B. half the speed of sound
C. three-fifths the speed of sound
D. 0.866 times the speed of sound
E. twice the speed of sound
8. A plane traveling north at 200m/s turns and then travels south at 200m/s. The change in its velocity is:
A. zero
B. 200m/s north
C. 200m/s south
D. 400m/s north
E. 400m/s south
9. Two bodies are falling with negligible air resistance, side by side, above a horizontal plane. If one of the bodies is given an additional horizontal acceleration during its descent, it:
A. strikes the plane at the same time as the other body.
B. strikes the plane earlier than the other body
C. has the vertical component of its velocity altered
D. has the vertical component of its acceleration altered
E. follows a straight line path along the resultant acceleration vector
10. The velocity of a projectile equals its initial velocity added to:
A. a constant horizontal velocity
B. a constant vertical velocity
C. a constantly increasing horizontal velocity
D. a constantly increasing downward velocity
E. a constant velocity directed at the target
