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Quiz 5
Mdcat-past-papers - NUMS - Physics Quiz
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Board: NUMS | Subject: Physics |
81. A 10N force moves a body around a circular path of radius 50cm. What is work done in completing one revolution?
5J
Zero
31.42J
500J
82. If we double both the speed and radius of circular path the centripetal force will be:
Same
Double
Four times
Eight times
83. When an object experiences circular motion, the direction of centripetal acceleration is:
Towards center
Along the tangent
Along the direction of motion
Opposite the direction of motion
84. The minimum required velocity to put a satellite into the orbit is called:
Terminal velocity
Escape velocity
Critical velocity
Average velocity
85. In case of centripetal force, the value of instantaneous acceleration is given by:
ac = v/r
ac = vr
ac = v²/r
ac = v²r
86. A disc, a hoop and a sphere are rolling down from an inclined plane simultaneously, which object will reach at the bottom first?
Hoop
Sphere
Disc
All at the same time
87. The angular form of centripetal force is:
Fc = mw²
Fc = mrw
Fc = mrw²
Fc = mr²w
88. A 2 kg mass in SHM under F = −200x, velocity at mean = 100 m/s. Amplitude?
1 m
10 m
100 m
200 m
89. Number of wavelengths per unit time is:
Speed
Velocity
Displacement
Frequency
90. To make frequency 4× in spring oscillation, we must:
Reduce mass to 1/4th
Make mass 4×
Reduce mass to 1/16th
Double the mass
91. If period of mass M is 1s, period of 16M is:
1 s
2 s
3 s
4 s
92. A 10 kg mass attached to spring (k = 20 N/m), displacement = 20 cm. Acceleration?
2.2 m/s²
4 m/s²
2 m/s²
0.4 m/s²
93. Trough of a wave acts as:
Concave lens
Convex lens
Convex mirror
Plane mirror
94. Crest of wave acts as:
Concave mirror
Convex mirror
Convex lens
Plane mirror
95. The horizontal distance travelled by wave during one complete cycle is called:
Frequency
Wavelength
Amplitude
Time period
96. In transverse wave, the portion above the mean level is called?
Wave front
Wave trough
Wave crest
Wave length
97. The maximum displacement of particle of a medium, on either side of the mean position of a wave is called:
Wavelength
Amplitude
Frequency
Crest
98. A normal person can hear sound waves ranging in frequency from 20Hz to 20kHz. The maximum wavelength is:
17m
17mm
17cm
17km
99. In ripple tank 40 waves pass through a certain point in one second. If the wavelength of the waves is 5cm, then find the speed of wave
2.7m/s
3m/s
2m/s
2m/s
100. The speed of sound is 332ms⁻¹ at 0°C. The speed at 10°C will be
338.1ms⁻¹
333.3ms⁻¹
334.2ms⁻¹
336.4ms⁻¹
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