arg the wells · guest · Physics

01 An alpha particle contains

A one electron This does not satisfy the stated relationship.

B one proton and one neutron This does not satisfy the stated relationship.

C two photons This does not satisfy the stated relationship.

D two protons and two neutrons It is a helium-4 nucleus.

Written for icaijy.com · U1 · Nuclear physics · answered at 1491 ms

02 During a one-minute revision round: An ideal step-up transformer increases voltage and

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

B increases current This does not satisfy the stated relationship.

C decreases current Ideal input and output powers are equal.

D increases power This does not satisfy the stated relationship.

Written for icaijy.com · U3 · Transformers · answered at 4806 ms

03 A student is checking a worked solution. After three half-lives, the undecayed fraction is

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

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

C \(1/6\) 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 9928 ms

04 A student is checking a worked solution. Conventional current in an external circuit is opposite to the drift of

A electrons Electrons carry charge opposite to conventional-current direction.

B photons This does not satisfy the stated relationship.

C positive ions in a metal lattice This does not satisfy the stated relationship.

D neutrons This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Electricity · answered at 14377 ms

05 A student is checking a worked solution. Refraction occurs because light

A changes speed between media A speed change produces a direction change except at normal incidence.

B becomes charged This does not satisfy the stated relationship.

C changes frequency at the boundary This does not satisfy the stated relationship.

D loses all energy This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Light · answered at 18252 ms

06 A student is checking a worked solution. The de Broglie wavelength of a particle is

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

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

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

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

Written for icaijy.com · U4 · Matter waves · answered at 24339 ms

07 A result close to repeated measurements but far from the accepted value is

A neither measurable nor valid This does not satisfy the stated relationship.

B both accurate and precise This does not satisfy the stated relationship.

C precise but inaccurate Small spread means precision; bias from accepted value means inaccuracy.

D accurate but imprecise This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Measurement · answered at 33234 ms

08 Which response best completes this VCE-style item? An alpha particle contains

A two protons and two neutrons It is a helium-4 nucleus.

B one proton and one neutron This does not satisfy the stated relationship.

C two photons This does not satisfy the stated relationship.

D one electron This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Nuclear physics · answered at 36411 ms

09 Which response best completes this VCE-style item? In an isolated collision, total

A speed of each object is conserved This does not satisfy the stated relationship.

B force is zero throughout This does not satisfy the stated relationship.

C momentum is conserved Internal impulses cancel, conserving total momentum.

D kinetic energy is always conserved This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Momentum · answered at 41775 ms

10 Which response best completes this VCE-style item? For constant mass, the net force equals

A \(mv^2\) always This does not satisfy the stated relationship.

B \(m\vec a\) Newton’s second law gives net force as mass times acceleration.

C \(m/\vec a\) This does not satisfy the stated relationship.

D \(\vec p/t^2\) This does not satisfy the stated relationship.

Written for icaijy.com · U2 · Dynamics · answered at 46674 ms

11 Which response best completes this VCE-style item? Above threshold, maximum photoelectron kinetic energy increases with

A exposure time only This does not satisfy the stated relationship.

B frequency \(K_{max}=hf-\phi\).

C surface area only This does not satisfy the stated relationship.

D intensity only This does not satisfy the stated relationship.

Written for icaijy.com · U4 · Photoelectric effect · answered at 54272 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 57460 ms

13 Which response best completes this VCE-style item? Convection transfers energy mainly through

A electron flow in a vacuum This does not satisfy the stated relationship.

B bulk motion of a fluid Warmer fluid moves and carries internal energy.

C electromagnetic waves only This does not satisfy the stated relationship.

D nuclear decay This does not satisfy the stated relationship.

Written for icaijy.com · U1 · Heat transfer · not answered before time expired