Physics Standard
level Paper 1 Monday 3 May 2021 (afternoon) 45 minutes µ , an eseplhhht " " Answers
1. Which lists one scalar and two vector quantities? A. Mass, momentum, potential difference B. Mass, power, velocity C. Power, intensity, velocity D. Power, momentum, velocity Mass scalar momentum Vector → b→=mÑ ✓ Potential difference → V=W_q= scalar Power = E. Ñ → scalar velocity → I vector Intensity → scalar 2J Same question ← Is asked In H L PAPER -2021
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5. A car takes 20 minutes to climb a hill at constant speed. The mass of the car is 1200 kg and the car gains gravitational potential energy at a rate of 6.0 kW. Take the acceleration of gravity to be 10ms-2. What is the height of the hill? A. 0.6 m B. 10m C. 600 m D. 6000 m ✓ same a%¥É% is asked
6. A ball undergoes an elastic collision with a vertical wall. Which of the following is equal to zero? A. The change of the magnitude of linear momentum of the ball B. The magnitude of the change of linear momentum of the ball C. The rate of change of linear momentum of the ball D. The impulse of the force on the ball 7. Two forces act on an object in different directions. The magnitudes of the forces are 18 N and 27 N. The mass of the object is 9.0 kg. What is a possible value for the acceleration of the object? A. 0ms-2 B. 0.5 m s-2 C. 2.0 m s-2 D. 6.0 m s-2 ✓ To = mu r DTs = Change of magnituted of Jf = mu the ball = / left Kil I = / MUI I mu / = 0 Tree = Fit fi -12 f , f , cos @ For Amar , 0=09 fmaae = Fat -1 for Fmln , 0=1809 Fmln Fa Fa ✓ Finan = 181-27=4 5N Fmln = 27-18 = 9N Amar = FYI = = 5m53 }- ANSWER should be & Mln = Fmf = g- = , m g2 In between 5m52 & 1m52
Which is a force pair according to Newton’s third law?
A. 1 and 2
B. 3 and 4
C. 2 and 3 D. 2 and 4
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8. Two identical boxes are stored in a warehouse as shown in the diagram. Two forces acting on the top box and two forces acting on the bottom box are shown.
→
mg R
2.
and { are R contact force
✓
equal in magnitude mg and opposite in direction
hl physics
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9. An electron has a linear momentum of 4.0 × 10-25 kg m s-1. What is the order of magnitude of the kinetic energy of the electron? A. 10-50 J B. 10-34 J C. 10-19 J D. 106J IB Tutors Worldwide, IB
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IB Physics Tutor in Karnataka, imam b- = ME ✓ ÷ :oy : KE-t.mu#m-tm-Y=IEnKF-=z( 4.0×(0-25) > 9×10-31 = 16 ✗ 10-50 18×10-3 • = 1% ✗ 1519J
liquid
kJ of energy
liquid
temperature
10. Which aspect of thermal physics is best explained by the molecular kinetic model? A. The equation of state of ideal gases B. The difference between Celsius and Kelvin temperature C. The value of the Avogadro constant D. The existence of gaseous isotopes 11. When 40 kJ of energy is transferred to a quantity of a
substance, its
increases by 20 K. When 600
is transferred to the same quantity of the
at its boiling temperature, it vaporizes completely at constant temperature. What is for this substance? A. 15 K-1 B. 15K C. 300 K-1 D. 300 K
Equation of state of
Ideal gas
can be obtained by
molecular
kinetic model
Ell b same question is asked In HL paper
12. A quantity of 2.00 mol of an ideal gas is maintained at a temperature of 127ûC in a container of volume 0.083 m3. What is the pressure of the gas? A. 8 kPa B. 25 kPa C. 40 kPa D. 80 kPa PV=n RT P=N÷T 2=2.0 Mol 7=1271-273 ✓ p= 2×8-37×400 = go kpa = 400k 083 V= • 083M ≥ R= 8.37 ( FROM 131 Iff DATA Book) → same question Is asked in HL paper
qud¥m
14mA same
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15. Two identical waves,
each with amplitude
X0
and intensity
I,
interfere constructively. What are the amplitude and intensity of the resultant wave?
MB I = I , + Iz -12 # TI , Cost RÉ at b- + zab Goes for constructive Interference cos 9=1 RÉ a-+ b- + Zab ✓ = XP -1×0-+2×02=4×02 R = 2×0 IR = It It 2 TITI = 4I
quantities increase when the light wave passes from water to air?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
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16. Three quantities used to describe a light wave are I. frequency II. wavelength III. speed. Which
Online Tutors In India Always frequency remains ✓ constant a- ÷miu=¥¥m=¥m Va = him Xa=hXm Velocity Increases wavelength Increases
17. A pipe of length L is closed at one end. Another pipe is open at both ends and has length 2L. What is the lowest common frequency for the standing waves in the pipes? ↑ ↑ two✓ f- = 262L)L fa= % 2L fz=2I 2. (2L ? fa=ˢ÷ ↓ f f > = # 322L) f > = 51 fq= 31 4L 444 fa= :-. b- = -9¥ ÷=f ↳ common in both
Same question asked in Hb 204
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20. For a real cell in a circuit, the terminal potential difference is at its closest to the emf when A. the internal resistance is much smaller than the load resistance. B. a large current flows in the circuit. C. the cell is not completely discharged. D. the cell is being recharged. 21. A long straight vertical conductor carries a current I upwards. An electron moves with horizontal speed v to the right. What is the direction of the magnetic force on the electron? A. Downwards B. Upwards C. Into the page D. Out of the page Same H.L. question 2021 ✓ $8 ¥ As per fleming left hand rule ④ B force is acting downward F ✓
A child stands on a horizontal rotating platform that is moving at constant angular speed. The centripetal force on the child is provided by
A. the gravitational force on the child.
B. the friction on the child’s feet.
C. the tension in the child’s muscles.
D. the normal reaction of the platform on the child.
Which is the definition of gravitational field strength at a point?
A. The sum of the gravitational fields created by all masses around the point
B. The gravitational force per unit mass experienced by a small point mass at that point
C. where M is the mass of a planet and r is the distance from the planet to the point
D. The resultant force of gravitational attraction on a mass at that point
22.
23.
dhqmueestion ✓ -05 as Reff, -1%4 ✓ 4¥, f- 4,11 A -m= GI 82 m=1kg force berkut mass
24. A simple model of an atom has three energy levels. The differences between adjacent energy levels are shown below F- = hf , f , = Ez = 6-63×10-19 a 6- 6 ✗ 10-34 = 1×1015 Hz ✓ F< = hf , f> = = 13-3×10-19 6- 6 ✗ 10-34 = 2× 1015 Hz
of the unified atomic mass unit in grams and the value of Avogadro’s constant in mol-1?
A. Their ratio is 1.
B. Their product is 1.
C. Their sum is 1.
D. Their difference is 0.
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25. What is the relation between the value
" → same as IB-E-e.E.hn ✓ ✓ 23 i > " 9 13° + Tina + % + a
27. A particle reaction is p + e - + v μ → n + μ + + v e . Which conservation law is violated by the reaction? A. Baryon number B. Charge C. Lepton number D. Momentum 28. Which change produces the largest percentage increase in the maximum theoretical power output of a wind turbine? A. Doubling the area of the blades B. Doubling the density of the fluid C. Doubling the radius of the blades D. Doubling the speed of the fluid ✓ I → I -1+0 = 01-1-10 ( violated P + e' + ѵ→n + little -1+1 = a + a conservation of momentum can never be Violated ¥ 50 same question asked ✓ In IBHL Physics 2021
A black body at temperature T emits radiation with peak wavelength λp and power P. What is the temperature of the black body and the power emitted for a peak wavelength of λp ? 2 29 ME P=e6AT& ✗ man -_ ¥✓ CASE I CASE II + 7. =p ¥%= # ¥ 2T Xp ✗ % p p%=T÷ñ=÷ p ' =L P ' = 168
30. In a simple climate model for a planet, the incoming intensity is 400 W m-2 and the radiated intensity is 300Wm-2. The temperature of the planet is constant. What are the reflected intensity from the planet and the albedo of the planet? _pq2 Reflected intensity = Incoming intensity ✓ Radiated intensity = 400 Wfmt , -30001mL TOTAL SCATTERED POWER = 100 Wfmt 2ALBEDO = yoga, IN cadent POWER = 1¥ = 0-25
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