ఆంధ్రప్రదేశ్ ప్రభుత్వం / Government of Andhra Pradesh
SELF ASSESSMENT TERM-1 MODEL PAPER – 2025-26
Class IX Subject – General Science (Paper-1: Physical Science)
UDISE Code : _________ PEN ID : _________ Roll No : _________
Duration : 3 Hours Maximum Marks : 80
విభాగం – A / Section A : బహుళ ఐచ్ఛిక ప్రశ్నలు / Multiple-Choice Questions
(Each question carries 1 mark – 20 × 1 = 20)
Choose the correct option and write the letter (A/B/C/D) in your answer sheet.
- The SI unit of electric current is —
A) Volt B) Ampere C) Ohm D) Watt - Which of the following is a scalar quantity?
A) Force B) Displacement C) Speed D) Velocity - Relation between distance, speed, and time is —
A) d = v/t B) d = v × t C) t = v / d D) v = d + t - Device converting chemical energy into electrical energy —
A) Generator B) Battery C) Motor D) Transformer - Rate of change of velocity is called —
A) Momentum B) Acceleration C) Speed D) Displacement - For every action there is an equal and opposite reaction.
This statement belongs to —
A) 1st law B) 2nd law C) 3rd law D) Gravitation - In a conductor, resistance increases when —
A) Temperature ↑ B) Length ↓ C) Area ↑ D) Temperature ↓ - Which one is an insulator?
A) Glass B) Copper C) Iron D) Aluminium - Which of the following is not an electromagnetic wave?
A) Sound B) X-ray C) Radio D) Microwave - SI unit of pressure is —
A) Pascal B) Newton C) Joule D) Watt - The momentum of a 2 kg body moving with 3 m/s is —
A) 6 kg m/s B) 1.5 kg m/s C) 9 kg m/s D) 0.67 kg m/s - Material used in transformer core —
A) Cast iron B) Steel C) Silicon steel D) Ceramic - Work done by a 10 N force moving body 5 m —
A) 5 J B) 15 J C) 25 J D) 50 J - In elastic collision, which quantity is conserved?
A) Momentum & Kinetic energy B) Only momentum C) Only energy D) None - Frequency 50 Hz corresponds to a time period —
A) 0.02 s B) 0.5 s C) 2 s D) 50 s - A current of 2 A passes through 5 Ω resistor.
Find V.
A) 2.5 V B) 7 V C) 10 V D) 0.4 V - Magnetic field lines around straight current conductor are —
A) Radial B) Circular C) Spiral D) Random - Unit of capacitance —
A) Henry B) Farad C) Ohm D) Tesla - Bending of light when passing from one medium to another is —
A) Reflection B) Refraction C) Diffraction D) Interference - Work is zero when —
A) Force ⊥ Displacement B) Both same direction C) Opposite D) None
విభాగం – B / Section B : సంక్షిప్త సమాధానాలు / Short-Answer Questions
(4 × 2 = 8 Marks)
- State Ohm’s Law and write its mathematical form.
- Define electrical power and write its formulas.
- What is simple harmonic motion? Give one example.
- Explain the law of conservation of energy with an example.
విభాగం – C / Section C : సంఖ్యాత్మక మరియు అన్వయ ప్రశ్నలు / Numerical & Application Questions
(5 × 4 = 20 Marks)
- A car accelerates from 20 m/s to 30 m/s in 5 s.
Find acceleration & distance. - Three resistors of 2 Ω, 3 Ω, 6 Ω are connected (a) in series (b) in parallel.
Find equivalent resistance. - A 100 W bulb burns for 5 h. Calculate the energy consumed in kWh and joules.
- Explain why the sky appears blue during the day and reddish during sunrise/sunset.
- Describe an experiment to determine the focal length of a concave mirror using a distant object.
విభాగం – D / Section D : దీర్ఘ సమాధానాలు / Long-Answer Questions
(2 × 8 = 16 Marks)
- (a) Explain Newton’s second law of motion (F = ma) with derivation.
(b) Solve one numerical example. - (a) Describe structure and working of a DC motor with labelled diagram.
(b) Discuss factors affecting resistance of a conductor.
ANSWER KEY / సమాధానాలు
Section A – MCQs:
1-B 2-C 3-B 4-B 5-B 6-C 7-A 8-A 9-A 10-A
11-A 12-C 13-D 14-A 15-A 16-C 17-B 18-B 19-B 20-A
Section B – Short Answers:
21. Ohm’s Law → V = IR; current ∝ voltage.
22. Power P = VI = I²R = V²/R.
23. SHM → Restoring force ∝ displacement (mass-spring, pendulum).
24. Energy neither created nor destroyed; pendulum example.
Section C – Numerical Hints:
25. a = (30-20)/5 = 2 m/s²; s = ut + ½ a t² = 125 m.
26. Series: R = 11 Ω; Parallel: 1/R = 1/2 + 1/3 + 1/6 = 1 ⇒ R = 1 Ω.
27. E = 100×5 h = 500 Wh = 0.5 kWh = 1.8×10⁶ J.
28. Rayleigh scattering → Blue sky; longer path → red.
29. Mirror–screen method; focal length = distance between mirror and sharp image.
Section D – Long Answers (Outline):
30. F = ma derivation; examples; impulse form F = Δp/Δt.
31. DC motor → Armature, commutator, brushes, field magnet;
Resistance ∝ length and temperature; ∝ 1/area; depends on material (resistivity).