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Quiz 7
Mdcat-past-papers - ETEA Quiz
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Board: ETEA |
121. A boy raises 10Kg object to height 5m. Stored potential energy:
491J
981J
490J
980J
122. Angular displacement is measured in:
Degrees
Revolutions
Radians
All of these
123. When angular speed of a body is doubled, the centripetal acceleration becomes:
Doubled
Thrice
Four times
Remains the same
124. The radial acceleration is also considered as:
Angular acceleration
Centripetal acceleration
Tangential acceleration
Translatory acceleration
125. Centripetal force =
mv/2r
mv²/r
mv/r
mv²/r
126. In a rotating spaceship, to produce artificial gravity, what does the centripetal force do?
Has no effect inside the spaceship
Pulls object towards the centre
Increases spaceship's rotation
Pushes the objects towards outer wall
127. When the mass of a body moving along a circle becomes half and radius becomes double and v is constant, the centripetal force becomes:
Double
One-fourth
Half
Remains Same
128. Energy of SHM oscillator is partly kinetic and partly potential. Which is correct?
KE max at extreme position
PE max at extreme position
Both KE and PE min at mean
PE max at mean position
129. A string of 6.0 m has wave speed of 24 m/s. Resonant frequencies?
1 Hz, 2 Hz, 3 Hz
2 Hz, 4 Hz, 6 Hz
3 Hz, 6 Hz, 9 Hz
5 Hz, 10 Hz, 15 Hz
130. Time period of a pendulum is T. If mass becomes 3m, new time period is:
T
3T
T/3
2T
131. If velocity = v, time period = T, frequency = f, then:
T = v/f
f = v + T
f = 1/T
T = v/f
132. Circular periodic waves can be generated:
In a ripple tank using spherical dippers
Using electromagnetic vibrator
By giving sudden up and down movement to a rope with one fixed end
All of the above
133. The distance covered by a sound wave per unit time is:
Speed of sound wave
Velocity of sound wave
Wavelength of sound wave
Amplitude of sound wave
134. Accelerating electromagnetic charges radiate electromagnetic waves which propagate at the:
Speed of electromagnetic waves
Frequency of electromagnetic waves
Frequency of light
Speed of light
135. The waves in which the particles of the medium vibrate about their mean position along the direction of propagation of the waves are called:
Longitudinal waves
Transverse waves
Mechanical waves
Electromagnetic waves
136. The number of waves passing through a certain point in unit time is called:
Wave speed
Wavelength
Time period of wave
Frequency of waves
137. A wave is characterized by three physical parameters:
Amplitude, Wavelength, Acceleration
Frequency, Wavelength, Acceleration
Wavelength, Frequency, Speed
Displacement, Wavelength, Speed
138. Which type of waves can be polarized?
Longitudinal waves
Mechanical waves
Transverse waves
Sound waves
139. For longitudinal waves:
The particles oscillate perpendicular to propagation
Particles remain stationary
The particles oscillate along direction of propagation
Velocity is enhanced in vacuum
140. A tuning fork having frequency 440 Hz produces sound waves which travel with a speed of 340 m/s. What is the separation between compression and adjacent rarefaction?
0.57 m
0.67 m
0.77 m
0.87 m
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