53 practice sets · Page 2 of 3
Which of the following is true about gravitational force?
It is always attractive
It is a contact force
It depends on the color of the object
It is a non-contact force
Correct Answer: A — It is always attractive
Explanation:
Gravitational force is always attractive between masses.
What is the value of acceleration due to gravity on Earth?
10 m/s²
9.8 m/s
9.8 m/s²
9.8 N/kg
Correct Answer: C — 9.8 m/s²
Explanation:
The acceleration due to gravity on Earth is approximately 9.8 m/s².
Which of the following is an example of an action and reaction pair according to Newton's Third Law of Motion?
A person pushing a wall
A ball falling to the ground
A car accelerating
A rocket lifting off
Correct Answer: A — A person pushing a wall
Explanation:
When a person pushes a wall, the wall pushes back with an equal and opposite force.
Which law explains why a person feels pushed back when a car suddenly accelerates?
Newton's Third Law
Newton's First Law
Newton's Second Law
Law of Universal Gravitation
Correct Answer: B — Newton's First Law
Explanation:
Newton's First Law explains inertia, which causes the body to resist changes in motion.
Which law explains the relationship between force and motion?
Newton's First Law
Law of Universal Gravitation
Newton's Third Law
Newton's Second Law
Correct Answer: D — Newton's Second Law
Explanation:
Newton's Second Law relates force, mass, and acceleration through F = ma.
Which of the following describes an object in motion?
It is moving with constant velocity
It is at rest
It is changing position over time
It is moving in a straight line
Correct Answer: C — It is changing position over time
Explanation:
An object is in motion if its position changes with time.
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 a property of acids?
Does not change color of litmus paper
Slippery feel
Sour taste
Bitter taste
Correct Answer: C — Sour taste
Explanation:
Acids are characterized by their sour taste and their ability to turn blue litmus red.
Which gas is responsible for the greenhouse effect?
Hydrogen
Carbon dioxide
Oxygen
Nitrogen
Correct Answer: B — Carbon dioxide
Explanation:
Carbon dioxide traps heat in the atmosphere and contributes to the greenhouse effect.
Which model of the atom is known as the "plum pudding model"?
Dalton's model
Rutherford's model
Bohr's model
Thomson's model
Correct Answer: D — Thomson's model
Explanation:
J.J. Thomson proposed the plum pudding model of the atom.
The discovery of the neutron was made by?
Niels Bohr
James Chadwick
Ernest Rutherford
J.J. Thomson
Correct Answer: B — James Chadwick
Explanation:
James Chadwick discovered the neutron in 1932.
Which part of the atom contains the protons and neutrons?
Nucleus
Electron cloud
Shells
Orbitals
Correct Answer: A — Nucleus
Explanation:
Protons and neutrons are located in the nucleus of an atom.
What is the mass of an electron?
1 amu
1836 amu
1/1836 amu
0 amu
Correct Answer: C — 1/1836 amu
Explanation:
The mass of an electron is about 1/1836 of the mass of a proton.
What is the atomic number of an element with 6 protons and 6 electrons?
12
6
4
8
Correct Answer: B — 6
Explanation:
Atomic number is equal to the number of protons in an atom.
Which of the following is an example of a covalent bond?
Sodium chloride (NaCl)
Magnesium oxide (MgO)
Calcium chloride (CaCl₂)
Hydrogen (H₂)
Correct Answer: D — Hydrogen (H₂)
Explanation:
Hydrogen atoms share electrons to form a covalent bond.
Which of the following elements has an atomic number of 6?
Hydrogen
Carbon
Nitrogen
Oxygen
Correct Answer: B — Carbon
Explanation:
Carbon has an atomic number of 6.
What is the smallest particle of an element?
Proton
Molecule
Ion
Atom
Correct Answer: D — Atom
Explanation:
An atom is the smallest unit of an element that retains its properties.
What is the primary difference between a compound and a mixture?
Mixtures have a fixed composition
Compounds are chemically bonded
Mixtures are always pure substances
Compounds can be separated by physical methods
Correct Answer: B — Compounds are chemically bonded
Explanation:
In compounds, elements are chemically bonded in fixed proportions.
