Q: Which equation is used to calculate the Young modulus of a material?

$$E = \frac{\text{stress}}{\text{strain}}$$

Q: A wire has a mass of 0.05 kg and a length of 2 m. What is its density if its cross-sectional area is $$1 \times 10$$^{-6}$$\ \text{m}^2$$?

$$2.5 \times 10^3$\ \text{kg/m}^3$$

Q: Which equation is used to calculate the efficiency of a machine?

$$\text{efficiency} = \frac{\text{useful output energy}}{\text{total input energy}}$$

Question 1

A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. What is the distance traveled by the car during this time? Use the kinematic equation $$s = ut + \frac{1}{2}at^2$.

Accepted Answer

$$25\ 	ext{m}$$

Question 2

Which of the following best describes the difference between scalar and vector quantities?

Accepted Answer

Scalar quantities have only magnitude, while vector quantities have magnitude and direction.

Question 3

A student drops a ball from a height of 10 m. Ignoring air resistance, what is the speed of the ball just before it hits the ground? Use $$v^2$$ = $$u^2 + 2as$ with g = 9.81$$\ 	ext{m/s}^2$$.

Accepted Answer

$$14\ 	ext{m/s}$$

Question 4

Which equation is used to calculate the Young modulus of a material?

Accepted Answer

$$E = \frac{	ext{stress}}{	ext{strain}}$$

Question 5

A projectile is launched horizontally from a height of 20 m. How long does it take to reach the ground? Use $$s = \frac{1}{2}gt^2$.

Accepted Answer

$$2.02\ 	ext{s}$$

Question 6

Which of the following is a correct statement of Newton’s third law?

Accepted Answer

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

Question 7

A wire has a mass of 0.05 kg and a length of 2 m. What is its density if its cross-sectional area is $$1 	imes 10$$^{-6}$$\ 	ext{m}^2$$?

Accepted Answer

$$2.5 	imes 10^3$\ 	ext{kg/m}^3$$

Question 8

Which equation describes the relationship between the speed, frequency, and wavelength of a wave?

Accepted Answer

$$v = f\lambda$$

Question 9

A resistor has a resistance of $$10\ \Omega$$ and a current of $$2\ 	ext{A}$$ flows through it. What is the potential difference across the resistor?

Accepted Answer

$$20\ 	ext{V}$$

Question 10

Which of the following best explains why the resistance of a metallic conductor increases with temperature?

Accepted Answer

Lattice vibrations increase, causing more collisions with electrons.

Question 11

A capacitor is charged to a potential difference of $$5\ 	ext{V}$$ and stores $$100\ \mu	ext{C} of $$charge. What is its capacitance?

Accepted Answer

$$20\ \mu	ext{F}$$

Question 12

Which equation is used to calculate the energy stored in a stretched spring?

Accepted Answer

$$E_{el} = \frac{1}{2}F\Delta x$$

Question 13

A student measures the diameter of a wire as $$0.50\ 	ext{mm}$$ using a micrometer with a resolution of $$0.01\ 	ext{mm}. $$What is the percentage uncertainty in the measurement?

Accepted Answer

$$1\%$$

Question 14

Which of the following is a real-world application of Hooke’s law?

Accepted Answer

Measuring the extension of a spring in a weighing scale.

Question 15

A student wants to determine the viscosity of a liquid using the falling-ball method. Which equation should they use?

Accepted Answer

$$F = 6\pi\eta rv$$

Question 16

Which of the following best describes the principle of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed from one form to another.

Question 17

A student plots a force-extension graph for a spring and observes a straight line up to a certain point, after which the line curves. What does the straight line represent?

Accepted Answer

Limit of proportionality

Question 18

Which equation is used to calculate the efficiency of a machine?

Accepted Answer

$$	ext{efficiency} = \frac{	ext{useful output energy}}{	ext{total input energy}}$$

Question 19

A student is asked to estimate the uncertainty in a measurement of length using a ruler with a resolution of $$1\ 	ext{mm}. $$What is the uncertainty?

Accepted Answer

$$0.5\ 	ext{mm}$$

Pearson Edexcel International Advanced Level Physics: Specification and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard