Q: Which of the following is the correct formula for the efficiency of a device?

$$\text{Efficiency} = \dfrac{\text{useful energy output}}{\text{total energy input}} \times 100\%$$

Q: A student wants to calculate the work done when a force of $$10\ \mathrm{N}$$ moves an object $$5\ \mathrm{m}. $$Which equation should they use?

$$\text{work done} = \text{force} \times \text{distance moved}$$

Q: Which of the following is the correct relationship for pressure difference in a liquid?

$$\text{pressure difference} = \text{density} \times \text{gravitational field strength} \times \text{height}$$

Question 1

A car accelerates uniformly from rest to a speed of $$20\ \mathrm{m/s} in$$ $$10\ \mathrm{s}. $$What is the acceleration of the car?

Accepted Answer

$$0.5\ \mathrm{m/s^2$}$$

Question 2

Which of the following best describes the energy transfer in a hydroelectric power station?

Accepted Answer

Gravitational potential energy $$\rightarrow$$ Kinetic energy $$\rightarrow$$ Electrical energy

Question 3

A transformer has $$500$$ turns on the primary coil and $$100$$ turns on the secondary coil. If the input voltage is $$230\ \mathrm{V}$$, what is the output voltage (assuming $$100\%$$ efficiency)?

Accepted Answer

$$46\ \mathrm{V}$$

Question 4

Which equation correctly relates force, change in momentum, and time taken?

Accepted Answer

$$F = \dfrac{\Delta p}{t}$$

Question 5

A student investigates the resistance of a light-dependent resistor (LDR). What happens to the resistance of the LDR as the light intensity increases?

Accepted Answer

The resistance decreases.

Question 6

Which of the following is the correct formula for the efficiency of a device?

Accepted Answer

$$	ext{Efficiency} = \dfrac{	ext{useful energy output}}{	ext{total energy input}} 	imes 100\%$$

Question 7

A sound wave has a frequency of $$500\ \mathrm{Hz}$$ and a wavelength of $$0.68\ \mathrm{m}. $$What is the speed of sound in air?

Accepted Answer

$$340\ \mathrm{m/s}$$

Question 8

Which of the following statements about radioactive decay is correct?

Accepted Answer

It is a random process and cannot be predicted for individual atoms.

Question 9

A metal block has a mass of $$2\ \mathrm{kg}$$ and a volume of $$0.0005\ \mathrm{m^3$}. $$What is its density?

Accepted Answer

$$4000\ \mathrm{kg/m^3$}$$

Question 10

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They contain free electrons that can move through the lattice.

Question 11

A satellite orbits the Earth in a circular path. Which force provides the centripetal force required for its motion?

Accepted Answer

Gravitational force

Question 12

Which equation gives the relationship between input and output voltages and the number of turns in a transformer?

Accepted Answer

$$\dfrac{V_p}{V_s} = \dfrac{N_p}{N_s}$$

Question 13

Which of the following is a correct statement about the electromagnetic spectrum?

Accepted Answer

Infrared radiation has a longer wavelength than visible light.

Question 14

A student wants to calculate the work done when a force of $$10\ \mathrm{N}$$ moves an object $$5\ \mathrm{m}. $$Which equation should they use?

Accepted Answer

$$	ext{work done} = 	ext{force} 	imes 	ext{distance moved}$$

Question 15

Which of the following is the correct relationship for pressure difference in a liquid?

Accepted Answer

$$	ext{pressure difference} = 	ext{density} 	imes 	ext{gravitational field strength} 	imes 	ext{height}$$

Question 16

Which of the following statements about Newton's Third Law is correct?

Accepted Answer

For every action, there is an equal and opposite reaction.

Question 17

A student shines a light ray into a glass block at an angle greater than the critical angle. What phenomenon will occur?

Accepted Answer

Total internal reflection

Question 18

Which of the following best describes the process of nuclear fission?

Accepted Answer

A large nucleus splits into smaller nuclei, releasing energy.

Question 19

A heater supplies $$2000\ \mathrm{J} of $$energy to $$0.5\ \mathrm{kg} of $$water, raising its temperature by $$10\ ^\circ\mathrm{C}. $$What is the specific heat capacity of water?

Accepted Answer

$$400\ \mathrm{J/(kg\ ^\circ C)}$$

Question 20

Which of the following is a correct statement about the Big Bang theory?

Accepted Answer

It suggests the universe is expanding from a hot, dense initial state.

Pearson Edexcel International GCSE Physics (9-1) Specification: Structured Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드