69 practice sets · Page 4 of 4
What is the term for motion along a straight line?
Circular motion
Rectilinear motion
Vibrational motion
Rotational motion
Correct Answer: B — Rectilinear motion
Explanation:
Motion along a straight path is called rectilinear motion.
An object travels 10 m east and then 10 m west. What is its displacement?
20 m
10 m
0 m
5 m
Correct Answer: C — 0 m
Explanation:
The object returns to its starting point, so displacement is zero.
What is the SI unit of acceleration?
m/s²
m/s
km/h
s/m
Correct Answer: A — m/s²
Explanation:
The SI unit of acceleration is meter per second squared (m/s²).
Which of the following is the SI unit of temperature?
Joule
Kelvin
Celsius
Fahrenheit
Correct Answer: B — Kelvin
Explanation:
Kelvin (K) is the SI unit of temperature.
What is the approximate speed of sound in air at room temperature?
400 m/s
343 m/s
330 m/s
220 m/s
Correct Answer: B — 343 m/s
Explanation:
The speed of sound in air at room temperature is approximately 343 m/s.
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
200 kJ
400 kJ
100 kJ
300 kJ
Correct Answer: A — 200 kJ
Explanation:
Kinetic energy = 1/2 mv² = 1/2 × 1000 × 20² = 200000 J = 200 kJ.
Who formulated the law of universal gravitation?
Albert Einstein
Galileo Galilei
Isaac Newton
Johannes Kepler
Correct Answer: C — Isaac Newton
Explanation:
Isaac Newton formulated the law of universal gravitation.
Which of the following is the correct formula for velocity?
v = u + at
v = u - at
v = u × at
v = u + a/t
Correct Answer: A — v = u + at
Explanation:
The equation v = u + at gives the final velocity for uniformly accelerated motion.
What is the SI unit of speed?
Kilometer
Meter per second
Second
Meter
Correct Answer: B — Meter per second
Explanation:
The SI unit of speed is meter per second (m/s).
