An object moves at constant speed around a circle of radius 1.0 m, completing one revolution in 2.0 s. What is the magnitude of its acceleration?
Correct answer A. π²
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Everyday Science MCQs
Page 141 of Everyday Science multiple-choice questions with answers. Tap an option to check yourself.
Page 141 of 198
A football is kicked at 45° to the horizontal with kinetic energy E. What is its kinetic energy at the highest point?
Correct answer B. E/2
In which process does the internal energy of a system increase?
Correct answer B. Adiabatic compression
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What is the ratio of the speed of sound at 4 atmospheres to its speed at 1 atmosphere?
Correct answer B. 1 : 1
The first overtone of a stretched string of fixed length is 320 Hz. What is its first harmonic?
Correct answer C. 160 Hz
Two identical metal balls carrying charges +2Q and -Q are a fixed distance apart and exert a force F on each other. They are briefly joined by a conducting wire, which is then removed. What is the new force between them?
Correct answer B. F/8
If one million electrons are added to a pith ball, what is its charge?
Correct answer C. -1.6 × 10⁻¹³ C
A cube with 5 cm sides carries a charge of 6 C. What is the surface charge density?
Correct answer C. 400 C m⁻²
As one electron is brought closer to another, what happens to the electrostatic potential energy of the system?
Correct answer B. Increases
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How many electrons per second make up a current of one microampere?
Correct answer A. 6.25 × 10¹² electrons
A piece of copper and a piece of germanium are cooled from room temperature to 77 K. What happens to their resistances?
Correct answer A. The resistance of copper decreases and that of germanium increases
What happens to two parallel beams of positrons moving in the same direction?
Correct answer A. Repel each other
An emf of 5 V is induced in a coil when the current changes steadily from 3 A to 2 A in 1 millisecond. What is the coil’s self-inductance?
Correct answer D. 5 mH
Why is the core of a transformer laminated?
Correct answer A. Eddy currents
Which of the following statements about the hydrogen spectrum is true?
Correct answer B. The Paschen series is a line spectrum in the infrared.
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What moves to produce an electric current in a solid metal conductor?
Correct answer B. Electrons
Under which condition is a force acting on a particle conservative?
Correct answer D. Its work depends only on the end points of the motion, not on the path between them
What path does a stone thrown from the top of a tall building follow?
Correct answer B. Parabolic
Through which medium does light travel most slowly?
Correct answer D. Glass
Which quantity is measured in farads?
Correct answer C. Capacitance