Practice exam 2 · Fundamentals of Physics

Question 1Not yet answeredMarked out of 3.00Periodic table

Who was the first to propose the periodic table?

DaltonChadwickRamseyMendeleev

Question 2Not yet answeredMarked out of 3.00Enthalpy

Which quantity does not influence the enthalpy?

TemperaturePressureVolumeCoefficient of linear expansion

Question 3Not yet answeredMarked out of 3.00Circuit components

Which of the following components could be a potential source?

SwitchCapacitorResistorBulb

Question 4Not yet answeredMarked out of 3.00Temperature scales

Which temperature has the same value in degrees Celsius and degrees Fahrenheit?

-20-40-10-30

Question 5Not yet answeredMarked out of 3.00Mirror imaging

A real object stands at

25\ \mathrm{mm}

in front of a convex mirror of focal distance

40\ \mathrm{mm}

. What is the type and position of the image?

Real at

66.67\ \mathrm{mm}

in front of the mirrorReal at

15.38\ \mathrm{mm}

in front of the mirrorVirtual at

15.38\ \mathrm{mm}

behind the mirrorVirtual at

66.67\ \mathrm{mm}

behind the mirror

Question 6Not yet answeredMarked out of 3.00Projectile motion

A military aircraft flying at an altitude of

10\,000\ \mathrm{m}

at

1\,440\ \mathrm{m/s}

throws a rocket. What is the horizontal distance separating the rocket-targeted location from the position of the aircraft? Effects like drag should be ignored.

105 km65 km85 km45 km

Question 7Not yet answeredMarked out of 3.00Adiabatic process

An ideal gas, initially at

(P_1; V_1)

, is subjected to an adiabatic expansion toward

(P_2; V_2)

. What is the ratio of its final over initial internal energy?

\left(\tfrac{V_1}{V_2}\right)^{\gamma - 1}

\left(\tfrac{P_2}{P_1}\right)^{-\gamma}

\left(\tfrac{P_1}{P_2}\right)^{-\gamma}

\left(\tfrac{V_2}{V_1}\right)^{\gamma - 1}

Question 8Not yet answeredMarked out of 6.00Sound interference

Two sound waves propagating at

340\ \mathrm{m/s}

at

1000\ \mathrm{Hz}

interfere. State for the following path length differences which ones lead to constructive (C), destructive (D), and not applicable (NA):

\Delta L = 0.51\ \mathrm{m};\ 0.75\ \mathrm{m};\ 1.19\ \mathrm{m};\ 1.36\ \mathrm{m};\ 1.7\ \mathrm{m}

.

Question 9Not yet answeredMarked out of 8.00AC RLC circuit

An RLC circuit (

R = 10\ \Omega

,

L = 50\ \mathrm{mH}

,

C = 500\ \mu\mathrm{F}

) is supplied by an alternating emf

e(t) = 110\ \mathrm{V}\,\cos(250t)

. Calculate the power supplied by the source and the power dissipated per cycle in the resistor. Show all intermediate calculations.

Question 10Not yet answeredMarked out of 10.00Photoelectric effect

Sodium has a work function of

2.76\ \mathrm{eV}

. State the lowest energy level in a hydrogen atom from which the emitted light, from an electron transition to the second level, is able to cause the photoelectric effect in sodium. Calculate in that case the minimum speed of the escaping electron. Use

h = 6.63\times10^{-34}\ \mathrm{Js}

and

m_{electron} = 9.11\times10^{-31}\ \mathrm{kg}

.