Q: A steel wire of length 2 m and cross-sectional area $$1 \times 10$$^{-6}$$ \ \mathrm{m}^2 is $$stretched by a force of 200 N. If the Young's modulus for steel is $$2 \times 10$$^{11}$$ \ \mathrm{N/m}^2$$, what is the extension produced in the wire?

$$1 \times 10$$^{-3}$$ \ \mathrm{m}$$

Q: A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?

$$2 \times 10^5$ \ \mathrm{J}$$

Question 1

A steel wire of length 2 m and cross-sectional area $$1 	imes 10$$^{-6}$$ \ \mathrm{m}^2 is $$stretched by a force of 200 N. If the Young's modulus for steel is $$2 	imes 10$$^{11}$$ \ \mathrm{N/m}^2$$, what is the extension produced in the wire?

Accepted Answer

$$1 	imes 10$$^{-3}$$ \ \mathrm{m}$$

Question 2

Which of the following best describes the principle behind Archimedes' Principle?

Accepted Answer

The upthrust on a body immersed in a fluid is equal to the weight of the fluid displaced by the body.

Question 3

A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?

Accepted Answer

$$2 	imes 10^5$ \ \mathrm{J}$$

Question 4

Which equation correctly represents Ohm's Law?

Accepted Answer

$$V = IR$$

Question 5

A simple harmonic oscillator has a period of 2 s. What is its angular frequency?

Accepted Answer

$$\pi \ \mathrm{rad/s}$$

Question 6

Which of the following is NOT a property of electromagnetic waves?

Accepted Answer

They require a medium to propagate.

Question 7

A laboratory experiment requires you to measure the density of an irregular solid. Which combination of measurements would you need?

Accepted Answer

Mass and volume

Question 8

A circuit contains a 12 V battery and two resistors of 4 $$\Omega$$ and 8 $$\Omega in $$series. What is the current in the circuit?

Accepted Answer

$$1 \ \mathrm{A}$$

Question 9

Which of the following best describes the function of a capacitor in an electronic circuit?

Accepted Answer

It stores electrical energy in an electric field.

Question 10

A sound wave travels through air at 340 m/s and has a frequency of 1700 Hz. What is its wavelength?

Accepted Answer

$$0.2 \ \mathrm{m}$$

Question 11

Which of the following statements about Bernoulli's Principle is correct?

Accepted Answer

An increase in the speed of a fluid occurs simultaneously with a decrease in pressure.

Question 12

A 5 kg object is lifted to a height of 10 m. What is the increase in its gravitational potential energy? (Take $$g = 9.8 \ \mathrm{m/s}^2)$$

Accepted Answer

$$490 \ \mathrm{J}$$

Question 13

Which of the following is a correct application of Kirchhoff's First Law?

Accepted Answer

The sum of currents entering a junction equals the sum of currents leaving the junction.

Question 14

A wave has a frequency of 50 Hz and a wavelength of 2 m. What is its speed?

Accepted Answer

$$100 \ \mathrm{m/s}$$

Question 15

Which of the following is the correct formula for the energy stored in a stretched spring obeying Hooke's Law?

Accepted Answer

$$E = \frac{1}{2}kx^2$

Question 16

A transformer has 100 turns on the primary coil and 500 turns on the secondary coil. If the input voltage is 240 V, what is the output voltage (assuming 100% efficiency)?

Accepted Answer

$$1200 \ \mathrm{V}$$

Question 17

Which of the following best describes the difference between longitudinal and transverse waves?

Accepted Answer

In longitudinal waves, particle displacement is parallel to wave propagation; in transverse waves, it is perpendicular.

Question 18

A current of 2 A flows through a resistor of 10 $$\Omega. $$What is the power dissipated by the resistor?

Accepted Answer

$$40 \ \mathrm{W}$$

Question 19

Which of the following is a correct statement of Faraday's Law of Electromagnetic Induction?

Accepted Answer

The induced emf in a circuit is equal to the negative rate of change of magnetic flux through the circuit.

Question 20

A laboratory experiment requires you to determine the acceleration due to gravity using a pendulum. Which measurement is most critical for accuracy?

Accepted Answer

The period of oscillation

Physics UOL Module Handbook – Study Guide and Syllabus Overview

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