That y8 kid 🤣 - bot · guest · Physics

01 During a one-minute revision round: A device receives 100 J and delivers 75 J usefully. Its efficiency is

A 75% Useful output divided by input is 0.75.

B 25% This does not satisfy the stated relationship.

C 100% This does not satisfy the stated relationship.

D 133% This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Efficiency · answered at 100 ms

02 Temperature is most directly related to the particles’ average

A gravitational potential energy This does not satisfy the stated relationship.

B translational kinetic energy Temperature tracks average random translational kinetic energy.

C electric charge This does not satisfy the stated relationship.

D rest mass This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Thermal physics · answered at 100 ms

03 A student is checking a worked solution. Adjacent nodes in a standing wave are separated by

A \(\lambda/4\) This does not satisfy the stated relationship.

B \(\lambda/2\) Nodes repeat every half-wavelength.

C \(2\lambda\) This does not satisfy the stated relationship.

D \(\lambda\) This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Standing waves · answered at 100 ms

04 During a one-minute revision round: During melting at constant pressure, added energy mainly

A reduces internal energy This does not satisfy the stated relationship.

B destroys energy This does not satisfy the stated relationship.

C increases particle potential energy Energy changes arrangement while temperature remains constant.

D increases temperature continuously This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Thermal physics · answered at 100 ms

05 Which response best completes this VCE-style item? Near Earth, gravitational potential energy change is

A \(m/gh\) This does not satisfy the stated relationship.

B \(mv\) This does not satisfy the stated relationship.

C \(ma\Delta h\) This does not satisfy the stated relationship.

D \(mg\Delta h\) For a uniform field near Earth, ΔUg = mgΔh.

Written for icaijy.com · U2 · Energy · answered at 100 ms

06 A student is checking a worked solution. Rest energy is given by

A \(E_0=m/c^2\) This does not satisfy the stated relationship.

B \(E_0=mc^2\) Mass has rest-energy equivalent mc².

C \(E_0=mc\) This does not satisfy the stated relationship.

D \(E_0=mv\) This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Relativity · answered at 100 ms

07 During a one-minute revision round: Diffraction is most significant when aperture width is

A exactly zero frequency This does not satisfy the stated relationship.

B comparable to the wavelength Spreading becomes prominent at wavelength-scale openings.

C independent of wavelength This does not satisfy the stated relationship.

D many orders larger than wavelength This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Diffraction · answered at 100 ms

08 A student is checking a worked solution. Reducing uncertainty in position generally causes uncertainty in momentum to

A decrease to zero This does not satisfy the stated relationship.

B remain exactly fixed This does not satisfy the stated relationship.

C increase Position and momentum obey an inverse uncertainty relationship.

D become classical This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Uncertainty · answered at 100 ms

09 Two components connected in parallel have the same

A current in every branch This does not satisfy the stated relationship.

B resistance This does not satisfy the stated relationship.

C power This does not satisfy the stated relationship.

D potential difference Both ends connect to the same two nodes.

Written for icaijy.com · U1 · Circuits · answered at 100 ms

10 The magnetic force on a moving charge is zero when velocity is

A at 45° only This does not satisfy the stated relationship.

B perpendicular to the field This does not satisfy the stated relationship.

C opposite to its momentum This does not satisfy the stated relationship.

D parallel to the field \(F=qvB\sin\theta\), so parallel motion gives zero.

Written for icaijy.com · U3 · Magnetic forces · answered at 100 ms

11 A student is checking a worked solution. During melting at constant pressure, added energy mainly

A increases temperature continuously This does not satisfy the stated relationship.

B destroys energy This does not satisfy the stated relationship.

C increases particle potential energy Energy changes arrangement while temperature remains constant.

D reduces internal energy This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Thermal physics · answered at 100 ms

12 Which response best completes this VCE-style item? A passenger lurches forward when a car brakes because of

A loss of mass This does not satisfy the stated relationship.

B a forward engine force This does not satisfy the stated relationship.

C inertia The passenger tends to maintain velocity unless acted on by a net force.

D weight increasing This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Newtonian motion · answered at 100 ms

13 Which response best completes this VCE-style item? A straight-line graph with a non-zero intercept most clearly indicates

A random error only This does not satisfy the stated relationship.

B zero uncertainty This does not satisfy the stated relationship.

C proof of causation This does not satisfy the stated relationship.

D a possible systematic offset A persistent intercept may reveal calibration or background bias.

Written for icaijy.com · U4 · Data analysis · answered at 100 ms

14 Which response best completes this VCE-style item? The de Broglie wavelength of a particle is

A \(\lambda=h/p\) Matter wavelength is inversely proportional to momentum.

B \(\lambda=p/h\) This does not satisfy the stated relationship.

C \(\lambda=hf\) This does not satisfy the stated relationship.

D \(\lambda=hp\) This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Matter waves · answered at 100 ms

15 During a one-minute revision round: After three half-lives, the undecayed fraction is

A \(1/8\) \((1/2)^3=1/8\).

B \(1/6\) This does not satisfy the stated relationship.

C \(3/8\) This does not satisfy the stated relationship.

D \(1/3\) This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Half-life · answered at 100 ms

16 Which response best completes this VCE-style item? An ideal step-up transformer increases voltage and

A changes AC to DC This does not satisfy the stated relationship.

B increases power This does not satisfy the stated relationship.

C decreases current Ideal input and output powers are equal.

D increases current This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Transformers · answered at 100 ms

17 Which response best completes this VCE-style item? Two components connected in parallel have the same

A potential difference Both ends connect to the same two nodes.

B resistance This does not satisfy the stated relationship.

C current in every branch This does not satisfy the stated relationship.

D power This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Circuits · answered at 100 ms

18 During a one-minute revision round: Two resistors in series always carry the same

A power This does not satisfy the stated relationship.

B resistance This does not satisfy the stated relationship.

C current There is one path for charge flow.

D voltage This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Circuits · answered at 100 ms

19 The centripetal force on a satellite in circular orbit is supplied by

A its engines continuously This does not satisfy the stated relationship.

B air resistance This does not satisfy the stated relationship.

C a magnetic force This does not satisfy the stated relationship.

D gravity Gravity points towards the orbital centre.

Written for icaijy.com · U3 · Circular motion · answered at 100 ms

20 Below the threshold frequency, increasing light intensity causes

A higher maximum electron energy This does not satisfy the stated relationship.

B the threshold frequency to decrease This does not satisfy the stated relationship.

C emission after a fixed delay This does not satisfy the stated relationship.

D no photoelectron emission Individual photons still lack sufficient energy.

Written for icaijy.com · U4 · Photoelectric effect · answered at 100 ms