Physical Sciences Grade 10 Eastern Cape March Test 2025 Memo

OR TAMBO INLAND DISTRICT GRADE 10 PHYSICAL SCIENCES MARCH 2025 MEMORANDUM MARKS: 75 THIS MEMORANDUM CONSISTS OF 6 PAGES INCLUDING THE COVER PAGE.

PHYSICAL SCIENCES - MEMO CAPS - GRADE 10 ORTID/MARCH 2025 QUESTION 1 1.1 B ✓✓ (2) 1.2 C ✓✓ (2) 1.3 A ✓✓ (2) 1.4 C ✓✓ (2) 1.5 D ✓✓ (2) 1.6 D ✓✓ (2) 1.7 D ✓✓ (2) [14] QUESTION 2 2.1 The algebraic sum of the amplitudes of two pulses that occupy the same space at the same time. ✓✓ (2) 2.2 Destructive interference. ✓ Interference between a crest and a trough leading to a reduced amplitude. ✓ (2) OR They sum up to a smaller amplitude. ✓ 2.3 A = 6 + (−8)✓ = −2cm✓ Answer only: full marks (2) [6] Copyright reserved 1 Please turn over

PHYSICAL SCIENCES - MEMO CAPS - GRADE 10 ORTID/MARCH 2025 QUESTION 3 3.1 A wave in which the particles of the medium vibrate at right angles to the direction of motion of the wave. ✓✓ (2) 3.2.1 A and C ✓ (1) 3.2.2 Trough ✓ (1) 3.2.3 Crest ✓ (1) 3.3 4 ÷ 2✓ = 2 m. ✓ (2) 3.4.1 T = 1 ✓ = 1 ✓ = 0,67s✓ (3) f 1,5 Positive marking from 3.3 3.4.2 v = f. λ ✓ = (1,5)(2) ✓ = 3m. s −1 ✓ (3) [13] QUESTION 4 4.1 A wave in which the particles of the medium vibrate parallel to the direction (2) of motion of the wave. ✓✓ 4.2.1 Rarefaction ✓ (1) 4.2.2 Compression ✓ (1) 4.2.3 Wavelength ✓ (1) 4.3.1 v = f. λ ✓ 1500 = 30 000 × λ ✓ λ = 0,05 m ✓ (3) 4.4 • To check the health of unborn babies in their mother’s womb. ✓ (2) • To diagnose and treat various conditions (tumours). ✓ (Any other additional uses) [10] Copyright reserved 2 Please turn over

PHYSICAL SCIENCES - MEMO CAPS - GRADE 10 ORTID/MARCH 2025 QUESTION 5 5.1 A photon is a packet of energy found in light. ✓✓ (2) 5.2 A = visible light ✓ B = X-rays ✓ (2) 5.3 E = hf ✓ = 6,63 × 10−34 × 2,5 × 1016 ✓ = 1,6575 × 10−17 J ✓ (3) 5.4 Because B has a higher frequency / energy✓ hence a higher penetrating (2) ability✓ OR X-rays are absorbed by bones to appear bright white✓ but visible light is deflected by soft tissues of the body. ✓ 5.5 ℎ𝑐 𝐸= ✓ 𝜆 6,63×10−34 ×3,0×108 7,25 × 10−13 ✓ = ✓ 𝜆 (4) 𝜆 = 2,74 × 10−13 𝑚. ✓ [13] Copyright reserved 3 Please turn over

PHYSICAL SCIENCES - MEMO CAPS - GRADE 10 ORTID/MARCH 2025 QUESTION 6 6.1 Every charge in the universe consists of an integer multiple of the charge of one electron. ✓✓ (2) In 6.2, two options have been provided to accommodate the wrong choice of sphere with excess electrons. 6.2 OPTION 1 OPTION 2 𝑄 𝑄 𝑛= ✓ 𝑛= ✓ 𝑒 𝑒 4,7×10−6 −5,3 × 10−6 = 1,6×10 −19 ✓ = −1,6×10−19 ✓ (3) 13 13 = 2,9375 × 10 electrons✓ = 3,3125 × 10 electrons✓ 6.3 To prevent the loss of electrons or charges. ✓ (1) OR To prevent leakage of charges. ✓ 6.4 A to B. ✓ A has excess electrons. ✓ (2) 6.5 𝑄1 +𝑄2 𝑄= ✓ 2 4,7×10−6 +(−5,3 × 10−6 ) = ✓ 2 (3) −7 = −3 × 10 𝐶 ✓ Positive marking from 6.5 6.6 OPTION 1 OPTION 2 ∆𝑄 = −3 × 10−7 − (−5,3 × 10−6 )✓ ∆𝑄 = −3 × 10−7 − 4,7 × 10−6 ✓ = 5 × 10−6 𝐶 = −5 × 10−6 𝐶 5×10−6 −5×10−6 𝑛= ✓ 𝑛= ✓ 1,6×10−19 −1,6×10−19 𝑛 = 3,125 × 1013 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠. ✓ 𝑛 = 3,125 × 1013 𝑒𝑙𝑒𝑐𝑡𝑟𝑜𝑛𝑠. ✓ (3) [14] Copyright reserved 4 Please turn over

PHYSICAL SCIENCES - MEMO CAPS - GRADE 10 ORTID/MARCH 2025 QUESTION 7 7.1 The energy transferred per unit electric charge (flowing through it) ✓✓ (2) 7.2 𝑊 𝑉= ✓ 𝑄 8000 (3) = ✓ 735 = 10,88 𝑉 ✓ [5] TOTAL [75] Copyright reserved 5 Please turn over