Measurements & Units
(True/False):
The SI unit of length is the meter.
True
The meter (m) is the standard SI unit for length.
(True/False)
Force is a push or pull on an object.
True
A force changes an objectâs motion â it pushes or pulls.
(True/False)
Energy is the ability to do work.
True
Without energy, no work can be done
(True/False)
Heat flows from a hotter object to a colder one.
True
Heat energy always moves from high temperature â low temperature.
(True/False)
Light travels in a straight line.
True
In the same medium, light always travels in straight lines.
(MCQ)
Which of the following is the SI unit of mass?
A) Gram
B) Kilogram
C) Pound
D) Newton
B) Kilogram
The kilogram (kg) is the SI unit of mass.
(MCQ)
The unit of force is:
A) Joule
B) Watt
C) Newton
D) Kilogram
C) Newton
Force is measured in Newtons (N), named after Sir Isaac Newton.
(MCQ)
The unit of work is:
A) Watt
B) Joule
C) Newton
D) Meter
B) Joule
Work = force Ă distance, measured in Joules (J).
(MCQ)
Which of these is NOT a method of heat transfer?
A) Conduction
B) Radiation
C) Evaporation
D) Convection
C) Evaporation
Heat is transferred by conduction (solids), convection (fluids), and radiation (waves).
(MCQ)
The speed of light in air is approximately:
A) 3 à 10⸠m/s
B) 3 Ă 10âś m/s
C) 30,000 m/s
D) 300 m/s
A) 3 à 10⸠m/s
Light is the fastest thing in the universe!
(Fill-in-the-blank MCQ)
The SI unit of time is the ______.
A) Minute
B) Second
C) Hour
D) Millisecond
B) Second
The second (s) is the SI unit for time.
(MCQ)
If an object is at rest, it stays at rest unless a force acts on it. This is:
A) Newtonâs First Law
B) Newtonâs Second Law
C) Newtonâs Third Law
D) Law of Gravity
A) Newtonâs First Law
Known as the law of inertia.
(MCQ)
Which is NOT a form of energy?
A) Kinetic
B) Potential
C) Friction
D) Heat
C) Friction
Friction is a force, not energy.
(MCQ)
Metals are good conductors of heat because:
A) They have free electrons
B) They are heavy
C) They are shiny
D) They are hard
A) They have free electrons
Free-moving electrons in metals transfer heat quickly.
(MCQ)
Which has the highest frequency sound?
A) Drum
B) Guitar
C) Whistle
D) Tuba
C) Whistle
High frequency = high pitch (whistles are very high-pitched).
(MCQ)
A student measures a penâs length with a ruler. What is the best unit?
A) Meter
B) Centimeter
C) Kilometer
D) Millimeter
B) Centimeter
Centimeters are best for small objects.
(MCQ)
If you push a wall with 20 N, the wall pushes back with:
A) 10 N
B) 0 N
C) 20 N
D) 40 N
C) 20 N
Newtonâs Third Law â equal and opposite reaction
(MCQ)
A 10 N force moves a box 5 m. Work done = ?
A) 15 J
B) 50 J
C) 2 J
D) 5 J
B) 50 J
Work = Force Ă Distance = 10 Ă 5 = 50 J.
(MCQ)
Which surface is the BEST absorber of heat radiation?
A) Shiny silver
B) Smooth white
C) Dull black
D) Transparent glass
C) Dull black
Black, rough surfaces absorb radiation more than shiny/light ones.
(MCQ)
Which of these is a luminous object?
A) Moon
B) Sun
C) Mirror
D) Ocean
B) Sun
Luminous objects give off their own light. The Moon only reflects sunlight.
(MCQ)
Which is the correct SI unit for speed?
âA) m/s
B) km/h
C) cm/s
D) mph
A) m/s
The SI unit is meters per second.
(MCQ)
A car travels 100 m in 20 s. Its speed is:
A) 2 m/s
B) 5 m/s
C) 10 m/s
D) 20 m/s
B) 5 m/s
Speed = distance á time = 100 á 20 = 5 m/s.
(MCQ)
Potential energy is greatest when:
A) Object is moving
B) Object is at rest at a height
C) Object is on the ground
D) Object is very hot
B) Object is at rest at a height
Stored energy due to position
(Fill-in-the-blank)
The boiling point of water at sea level is ______ °C.
100 °C
Water boils at 100 °C under normal atmospheric pressure.
(MCQ)
Which color of light has the shortest wavelength?
A) Red
B) Green
C) Blue
D) Violet
D) Violet
Violet light has the shortest wavelength and highest energy.