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Mock Exam IB DP Physics HL Paper 1 Set 1

Question

What is a correct value for the charge on an electron?

A. 1.60 x 10–12 μC

B. 1.60 x 10–15 mC

C. 1.60 x 10–22 kC

D. 1.60 x 10–24 MC

Answer/Explanation

Markscheme

C

electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10−31 kg, which is only 1/1,836the mass of a proton. 

Question

An object of mass m is connected via a frictionless pulley to an object of mass M, where M > mM rests on a horizontal frictionless surface

What is the acceleration of the system?

Answer/Explanation

Markscheme

A

Acceleration = net Force acting on body / moving mass

\(a= \frac{mg}{m+M}\)

 
Question

A railway engine of mass m moves along a horizontal track with uniform speed \(v\). The total resistive force acting on the engine is \(F\).

Which of the following is the power of the engine?

A.     \(\frac{F}{{mv}}\)

B.     \(Fv\)

C.     \(\frac{{mv}}{F}\)

D.     \(\frac{v}{F}\)

Answer/Explanation

Markscheme

B

\(Power = F.V\)
\(= Fv cos 180^{\circ}\)
\(= – Fv\)
Magnitude \(= Fv\)

Question

A sample of solid copper is heated beyond its melting point. The graph shows the variation of temperature with time.

During which stage(s) is/are there an increase in the internal energy of the copper?

A. P, Q and R

B. Q only

C. P and R only

D. Q and R only

Answer/Explanation

Markscheme

A

When a solid melts, its molecules move apart against the strong molecular attraction. This needs energy which must be supplied from outside. Thus, the  internal energy of a given body is larger in liquid phase than in solid phase. Similarly, the internal energy of a given body in vapour phase is larger than that in liquid phase.
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