A
Which instrument is most suitable for measuring the diameter of a wire?
A. Metre rule
B. Vernier calipers
C. Micrometer screw gauge
D. Measuring tape
C. Micrometer screw gauge
Which quantity is a vector?
A. Distance
B. Speed
C. Time
D. Velocity
D. Velocity
On a distance-time graph, a horizontal line means the object is
A. Accelerating
B. Moving at constant speed
C. Stationary
D. Decelerating
C. Stationary
Momentum equals
A. mv²
B. ma
C. mv
D. mg
C. mv
Power is defined as
A. Force × distance
B. Energy transferred per second
C. Mass × acceleration
D. Force per unit area
B. Energy transferred per second
A car travels 180 km in 3 hours. Its average speed is
A. 30 km/h
B. 60 km/h
C. 90 km/h
D. 540 km/h
B. 60 km/h
Heat is transferred mainly through solids by
A. Radiation
B. Conduction
C. Convection
D. Evaporation
B. Conduction
During melting, the temperature
A. Increases continuously
B. Decreases
C. Remains constant
D. Doubles
C. Remains constant
Current is measured using a
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Thermometer
B. Ammeter
Which arrangement gives the greatest total resistance?
A. Parallel resistors
B. Series resistors
C. One resistor
D. Depends on current
B. Series resistors
Total internal reflection occurs when light travels
A. From air to glass
B. From glass to air
C. From water to glass
D. From vacuum to glass
B. From glass to air
The magnetic field around a straight current-carrying wire is
A. Straight
B. Circular
C. Vertical
D. Horizontal
B. Circular
Induced current is produced by
A. Heating a wire
B. Moving a magnet relative to a coil
C. Increasing resistance
D. Decreasing voltage
B. Moving a magnet relative to a coil
The nucleus contains
A. Electrons only
B. Protons only
C. Protons and neutrons
D. Neutrons and electrons
C. Protons and neutrons
Which radiation has the greatest penetrating power?
A. Alpha
B. Beta
C. Gamma
D. Neutron
C. Gamma
Which colour has the longest wavelength in visible light?
A. Violet
B. Blue
C. Green
D. Red
D. Red
Which of the following is NOT a planet?
A. Mars
B. Venus
C. Pluto
D. Saturn
C. Pluto
As the distance of a planet from the Sun increases, its orbital speed generally
A. increases
B. remains constant
C. decreases
D. becomes zero
C. decreases
A comet differs from a planet because a comet
A. emits its own light
B. has a highly elliptical orbit
C. has no mass
D. has no gravity
B. has a highly elliptical orbit
A Sun-like star eventually becomes a
A. neutron star
B. black hole
C. white dwarf
D. red supergiant
C. white dwarf
A tractor has very wide tyres, while a racing bicycle has very narrow tyres.
Explain why each vehicle is designed this way, using the concept of pressure.
A student moves a magnet slowly into a coil and observes a small galvanometer deflection.
The student repeats the experiment by moving the magnet much faster.
Predict what happens to the galvanometer reading and explain why.
Two identical lamps are connected in series to a battery. One lamp burns out.
Predict what happens to the other lamp and explain your answer.
Astronauts on the Moon can jump much higher than they can on Earth, even though their mass remains the same.
Explain why this happens.
On a hot day, people often wear light-coloured clothing instead of dark-coloured clothing.
Explain why light-coloured clothing helps keep the body cooler.