A car accelerates uniformly from rest to a speed of 25 m/s over a distance of 100 m.
What is the acceleration of the car?
A) 2.5 m/s²
B) 3.1 m/s²
C) 5.0 m/s²
D) 6.3 m/s²
Answer: B) 3.1 m/s²
Rationale: Using the equation v2=u2+2asv^2 = u^2 + 2asv2=u2+2as, where v=25
,m/sv = 25 \, m/sv=25m/s, u=0u = 0u=0, and s=100 ms = 100 \, ms=100m, we can
solve for aaa:
252=0+2a(100)⇒a=625200=3.125 m/s2≈3.1 m/s225^2 = 0 + 2a(100) \Rightarrow a
= \frac{625}{200} = 3.125 \, m/s² \approx 3.1 \, m/s²252=0+2a(100)⇒a=200625
=3.125m/s2≈3.1m/s2
Question 2
Which of the following is true about the conservation of momentum?
A) Momentum is always conserved in any type of collision.
B) Momentum is conserved only in elastic collisions.
C) Momentum is conserved in isolated systems regardless of the type of collision.
D) Momentum can be created or destroyed in a collision.
Answer: C) Momentum is conserved in isolated systems regardless of the type of
collision.
Rationale: The law of conservation of momentum states that the total momentum of
an isolated system remains constant if no external forces act upon it.
Question 3
What is the primary factor that determines the gravitational force between two
objects?
A) The mass of one object
B) The distance between the objects
C) The mass of both objects
D) The speed of the objects
Answer: C) The mass of both objects
Rationale: The gravitational force between two objects is given by Newton's law of
universal gravitation, F=Gm1m2r2F = G \frac{m_1 m_2}{r^2}F=Gr2m1m2,
,indicating that the force depends on the product of their masses and the distance
between them.
Question 4
If a wave has a frequency of 500 Hz and a wavelength of 0.5 m, what is the wave
speed?
A) 100 m/s
B) 200 m/s
C) 250 m/s
D) 500 m/s
Answer: C) 250 m/s
Rationale: The wave speed vvv can be calculated using the formula v=fλv = f \
lambdav=fλ, where fff is frequency and λ\lambdaλ is wavelength. Therefore, v=500
Hz×0.5 m=250 m/sv = 500 \, Hz \times 0.5 \, m = 250 \, m/sv=500Hz×0.5m=250m/s.
Question 5
What happens to the pressure of a gas if its volume is decreased while keeping the
temperature constant?
A) The pressure decreases.
B) The pressure increases.
C) The pressure remains constant.
D) The pressure becomes zero.
Answer: B) The pressure increases.
Rationale: According to Boyle's Law, at constant temperature, the pressure of a gas is
inversely proportional to its volume. Therefore, decreasing the volume increases the
pressure.
, Question 6
Which of the following quantities is a scalar?
A) Velocity
B) Force
C) Acceleration
D) Energy
Answer: D) Energy
Rationale: Energy is a scalar quantity, while velocity, force, and acceleration are
vector quantities that have both magnitude and direction.
Question 7
An object is in free fall. Ignoring air resistance, what is the acceleration of the object?
A) 0 m/s²
B) 9.8 m/s²
C) 10 m/s²
D) Depends on the mass of the object
Answer: B) 9.8 m/s²
Rationale: Near the surface of the Earth, the acceleration due to gravity is
approximately 9.8 m/s² for any object in free fall, regardless of its mass.
Question 8
What is the term for the energy stored in an object due to its position or
configuration?
A) Kinetic energy
B) Potential energy
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