0625 Physics

A

100

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

200

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

300

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

400

Which colour has the longest wavelength in visible light?

A. Violet

B. Blue

C. Green

D. Red

D. Red

500

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.

• Tractor: larger contact area reduces pressure, preventing it from sinking into soft ground. (1)
• Bicycle: smaller contact area increases pressure and lower  resistance on roads. (1)

B

100

Which quantity is a vector?

A. Distance

B. Speed

C. Time

D. Velocity

D. Velocity

200

Heat is transferred mainly through solids by

A. Radiation

B. Conduction

C. Convection

D. Evaporation

B. Conduction

300

The magnetic field around a straight current-carrying wire is

A. Straight

B. Circular

C. Vertical

D. Horizontal

B. Circular

400

Which of the following is NOT a planet?

A. Mars

B. Venus

C. Pluto

D. Saturn

C. Pluto

500

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.

• Larger galvanometer deflection (greater induced current/emf). (1)

• Faster movement causes a greater rate of change of magnetic flux. (1)

C

100

 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

200

During melting, the temperature

A. Increases continuously

B. Decreases

C. Remains constant

D. Doubles

C. Remains constant

300

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

400

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

500

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.

• The other lamp goes out. (1)

• A broken lamp creates an open circuit, so no current flows through the circuit. (1)

D

100

Momentum equals

A. mv²

B. ma

C. mv

D. mg

C. mv

200

Current is measured using a

A. Voltmeter

B. Ammeter

C. Ohmmeter

D. Thermometer

B. Ammeter

300

The nucleus contains

A. Electrons only

B. Protons only

C. Protons and neutrons

D. Neutrons and electrons

C. Protons and neutrons

400

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

500

Astronauts on the Moon can jump much higher than they can on Earth, even though their mass remains the same.

Explain why this happens.

• The Moon has a much weaker gravitational field, so the astronaut's weight is less. (1)

• With the same force from the legs, the astronaut accelerates upward more easily and jumps higher, while mass remains unchanged. (1)

E

100

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

200

Which arrangement gives the greatest total resistance?

A. Parallel resistors

B. Series resistors

C. One resistor

D. Depends on current

B. Series resistors

300

Which radiation has the greatest penetrating power?

A. Alpha

B. Beta

C. Gamma

D. Neutron

C. Gamma

400

A Sun-like star eventually becomes a

A. neutron star

B. black hole

C. white dwarf

D. red supergiant

C. white dwarf

500

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.

• Light-coloured clothes reflect more of the Sun's radiation. (1)
• They absorb less thermal energy, so the body stays cooler. (1)