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Quiz 5
Mdcat-past-papers - DUHS Quiz
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Board: DUHS |
81. Two bodies of masses 10kg and 40kg are dropped from the same height at the same time. Value of which of the following remains the same during the motion of the two bodies?
Acceleration
Kinetic energy
Potential energy
Power
82. The rate of doing work is zero, when the angle θ between force and velocity is:
θ = 60°
θ = 0°
θ = 180°
θ = 45°
83. 1 J/s is equal to:
1 K
1 N
1 T
1 Watt
84. If mass and speed of object double, kinetic energy becomes:
Eight times
Four times
Doubled
Sixteen times
85. A wheel of bike rotates from rest and achieves 6.28 radian/s in 2 seconds. What will be its angular acceleration?
1 rad/s²
1.5 rad/s²
3.14 rad/s²
6.28 rad/s²
86. The ratio of linear velocity and radius equals to:
Angular displacement
Angular velocity
Angular acceleration
Angular momentum
87. A cyclist moving on a circular track skids because:
Limiting friction ⊥ centripetal force
Limiting friction > required centripetal force
Limiting friction opposes centripetal force
Limiting friction = required centripetal force
88. Every particle of a rotating disc moves with:
Constant linear velocity
Constant angular velocity
Constant tangential velocity
Constant linear displacement
89. A body is moving with constant speed. With radius of circle 'r' and time period 'T' the centripetal acceleration is given by:
α = 2πr/T
α = 4π²r/T²
α = 4π²r/T²
α = 4π²r²/T
90. Which of the following results in production of centripetal acceleration in the body?
Change in velocity magnitude
Change in mass
Change in force magnitude
Change in direction of velocity
91. The most appropriate mathematical expression representing SHM is:
a ∝ −x
a = x
a ∝ x
a = kx
92. If the given spring of spring constant K is cut into three identical segments, the spring constant of each segment is:
1K
K/2
K/3
3K
93. In vibratory motion, the maximum displacement on either side of equilibrium position is called:
Distance
Displacement
Amplitude
Frequency
94. If a pendulum completes one cycle in half seconds, its frequency is:
1 Hz
3 Hz
2 Hz
4 Hz
95. A sound travels from one medium to another. Which one of the following characteristics of sound remains unchanged?
Amplitude
Velocity
Pitch
Quality
96. The intensity level (sound level) of faintest audible intensity is:
160 decibel
Zero decibel
140 decibel
120 decibel
97. If the wavelength of a light is 3 × 10⁻⁷ m, then what is its frequency?
1 × 10¹⁴ Hz
1 × 10¹⁵ Hz
1 × 10¹³ Hz
1 × 10¹⁶ Hz
98. The energy of light is determined by its:
Frequency
Intensity
Amplitude
Speed
99. The product of frequency and wavelength of a wave equals to:
Displacement of the wave
Amplitude of the wave
Speed of the wave
Time period of the wave
100. An object moving faster than the speed of sound. This object is called:
Sonic
Supersonic
Hypersonic
Ultrasonic
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