0625_m21_qp_42
A paper of Physics, 0625
Questions:
10
Year:
2021
Paper:
4
Variant:
2
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1
shows a piece of glass of thickness 2.0 cm and area 0.15 m2. The density of the glass is 2.6 × 103 kg / m3. area 0.15 m2 thickness 2.0 cm (not to scale) Calculate the weight of the piece of glass. weight = The piece of glass shown in is used as the vertical viewing window of an aquarium. The atmospheric pressure outside the aquarium is 1.0 × 105 Pa. The average pressure on the inside of the aquarium window is 1.3 × 105 Pa. Calculate the resultant force acting on the window due to these pressures and state the direction in which it acts. force = direction of force shows a vacuum pump connected to the top of a vertical tube with its lower end immersed in a tank of liquid. The pump reduces the pressure above the column to zero and the pressure at point X is 9.6 × 104 Pa. point X 12 m liquid vacuum pump (not to scale) Calculate the density of the liquid. density =
1. Motion, forces and energy  →  1.8. Pressure
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2
State what is meant by the moment of a force about a point. shows a large crane on a construction site lifting a block of mass 14 000 kg. 20 m B A block counterweight operator’s cabin Calculate the moment about A due to the 14 000 kg block suspended from B. moment = Speed is a scalar quantity and velocity is a vector quantity. State the difference between a scalar quantity and a vector quantity. Write down one other scalar quantity and one other vector quantity. scalar quantity vector quantity shows two forces acting on an object. 60° 30 N 20 N (not to scale) Draw a scale diagram to determine the resultant force acting on the object. State the scale you use. scale magnitude of resultant force = direction of resultant relative to the direction of the 20 N force =
1. Motion, forces and energy  →  1.1. Physical quantities and measurement techniques
1. Motion, forces and energy  →  1.5.2. Turning effect of forces
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3
A power station burns waste materials from farm crops to generate electricity. State and explain whether this process is renewable. statement explanation The power station uses some of its waste thermal energy to heat water for houses in a nearby town. State one problem of using waste energy in this way if the power station is far from the town. Suggest a way of reducing this problem. State two environmental consequences of burning coal to generate electricity. consequence 1. consequence 2.
1. Motion, forces and energy  →  1.7.3. Energy resources
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4
In terms of the momentum of molecules, explain how a gas exerts pressure on the walls of its container. A fixed mass of gas of volume V1 is at a pressure p1. It is compressed to a volume V2. Complete the equation for the final pressure p2 of the gas when the gas is compressed at constant temperature. p2 = State and explain how the final pressure compares with p2 when the temperature of the gas increases during compression. statement explanation
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
2. Thermal physics  →  2.1.2. Particle model
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5
State the name of the reflection of a sound wave or ultrasound wave. shows an ultrasound wave being used to scan an internal organ of a human body. ultrasound wave internal organ ultrasound transmitter and receiver The ultrasound wave has a frequency of 2.0 MHz and passes through human tissue at a speed of 1500 m / s. Calculate the wavelength of the ultrasound wave in human tissue. wavelength = shows crests of a wave from a point source S approaching a straight barrier. straight barrier S On , indicate and label one wavelength. On , draw three crests of the wave reflected from the barrier.
3. Waves  →  3.4. Sound
3. Waves  →  3.1. General properties of waves
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6
is a full scale diagram showing a converging lens, the two principal focuses F1 and F2 and an object PO. P O F2 F1 On , draw two rays from point O of the object to determine the position of the image. Label the image IJ. Measure the length of the image. image length = Ring three descriptions of the image. diminished magnified real same size same way up as object upside down compared to object virtual shows three rays of green light passing through glass blocks. glass blocks ray of green light Three rays of red light approach the glass blocks on the same paths as the rays of green light. On , draw the paths of these rays of red light to the right of the glass blocks.
3. Waves  →  3.2.3. Thin lenses
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7
shows a horizontal conducting wire XY between two opposite magnetic poles. Wire XY forms a circuit with an ammeter. N S wire X Y A Explain why the reading on the ammeter is zero when the wire XY is not moving. The wire XY is moved and there is a deflection on the ammeter that indicates there is a current in the wire from X to Y. On Table 7.1, tick one box to indicate the direction of the movement of the wire XY and explain your answer. Table 7.1 into page out of page to the left to the right to the bottom of the page to the top of the page explanation State what is observed on the ammeter when the wire XY is moved in the opposite direction to part in the same direction as part but at a greater speed
4. Electricity and magnetism  →  4.5.3. Magnetic effect of a current
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10
State the proton number, nucleon number and the value of the charge on an α-particle. proton number nucleon number charge A nucleus of strontium-90 consists of 38 protons and 52 neutrons. Strontium-90 is radioactive and decays by β-emission to an isotope of yttrium. The symbol for strontium is Sr and the symbol for yttrium is Y. Write down the nuclide equation of this decay. The half-life of radon-220 is 56 s. A sample of radon-220 is in a container. After 112 s the mass of radon-220 is 9.2 mg. Calculate the mass of the original sample. mass =
5. Nuclear physics  →  5.2.3. Radioactive decay
5. Nuclear physics  →  5.1.2. The nucleus
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