What is the minimum number of communication satellites needed to cover the whole Earth?
Correct answer B. 3
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Everyday Science MCQs
Page 156 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 156 of 198
What kind of frame of reference is a satellite orbiting the Earth?
Correct answer B. A non-inertial frame
Which planet comes closest to the Earth?
Correct answer A. Venus
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Who discovered the inverse square law of gravitation?
Correct answer B. Newton
A man of weight W stands in a lift that is accelerating upwards at a. What is his apparent weight?
Correct answer C. mg + ma
A body completes two revolutions around a circular path of radius R. What is the ratio of its displacement to the distance it has travelled?
Correct answer A. 0
A stone is whirled on a string in a vertical circle. At which point is the string most likely to break?
Correct answer B. At the lowest point
A 10 kg mass is whirled at 1 m/s on the end of an inextensible string 10 m long. What is the outward force on the mass?
Correct answer D. 1 N
A motor shaft rotates steadily at 360 rev/min. Through what angle, in radians, does it turn in 1 second?
Correct answer C. 12π
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What is the angular speed of the seconds hand of a watch in rad s⁻¹?
Correct answer B. π/30
What form does Newton’s second law take for angular motion?
Correct answer B. Στ = Iα
A wheel of radius r turns through 30°. How far does a point on its rim move?
Correct answer A. (π/6) × r
Why does a cyclist riding round a circular racing track skid?
Correct answer B. The centripetal force upon him is greater than limiting friction
A wheel of diameter 1 m turns at 30 revolutions per minute. What is the linear speed of a point on its rim, in m s⁻¹?
Correct answer C. π/2
What is the angular speed of the Earth’s daily rotation in rad s⁻¹?
Correct answer C. 7.3 × 10⁻⁵ rad/s
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A body moving round a circle of radius R completes two revolutions. What is the ratio of its displacement to the distance covered?
Correct answer B. 0
Along which kind of path can a body move with constant velocity?
Correct answer C. Rectilinear path
A car moves at a steady 2 m s⁻¹ around a circle of radius 0.4 m. What is its angular speed?
Correct answer D. 5 rad s⁻¹
What provides the centripetal acceleration needed by the planets?
Correct answer C. Gravitational force
On what does the length of a long jump depend?
Correct answer B. Angle of projection