Class 9 β Physics
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Textbooks β’ PCTB β’ π 1 β’ β¬ 0
Chapter-wise Notes β’ Chapter 1 β’ PCTB β’ 5.4 KB β’ π 1 β’ β¬ 1
Guess Papers β’ 2026 β’ PCTB β’ 3 KB β’ π 1 β’ β¬ 1
Practice MCQs β Physics
Q1. The SI unit of length is:
β Correct: B β Metre is the SI base unit of length.
Q2. The prefix "nano" is equal to:
β Correct: C β Nano = 10^-9, e.g. 1 nm = 10^-9 m.
Q3. The least count of a Vernier caliper is:
β Correct: B β A standard Vernier caliper measures accurately up to 0.1 mm (0.01 cm).
Q4. How many significant figures are in 0.00450?
β Correct: B β Leading zeros are not significant; 4, 5 and the trailing 0 are β total 3.
Q5. Which instrument is used to measure the thickness of a paper sheet?
β Correct: C β A micrometer screw gauge (least count 0.01 mm) measures very small thicknesses.
Q6. The SI unit of mass is:
β Correct: B β Kilogram is the SI base unit of mass.
Q7. A stopwatch is used to measure:
β Correct: C β A stopwatch measures time intervals in the laboratory and sports.
Q8. The least count of a micrometer screw gauge is:
β Correct: B β Screw gauge least count = pitch / circular scale divisions = 0.01 mm typically.
Q9. Which of the following is a derived quantity?
β Correct: C β Force is derived (newton = kgΒ·m/sΒ²); length, time and mass are base quantities.
Q10. Zero error occurs in an instrument when:
β Correct: B β Zero error is the offset when the measuring scale does not start exactly at zero.
Q11. The study of motion of objects is called:
β Correct: B β Kinematics describes motion without considering its causes.
Q12. Which of the following is a scalar quantity?
β Correct: C β Speed has magnitude only; velocity, displacement and acceleration are vectors.
Q13. The SI unit of acceleration is:
β Correct: B β Acceleration is change of velocity per unit time, unit m/s2.
Q14. A body at rest has velocity:
β Correct: B β A body at rest does not change position, so its velocity is zero.
Q15. The area under a speed-time graph gives:
β Correct: B β Area under speed-time graph equals total distance travelled.
Q16. The acceleration of a freely falling body near Earth is about:
β Correct: B β Gravitational acceleration g is about 9.8 m/s2, taken as 10 m/s2 in class 9 numericals.
Q17. Which equation is correct?
β Correct: A β First equation of motion: vf = vi + at.
Q18. A car moves 100 m in 5 s at uniform speed. Its speed is:
β Correct: B β Speed = distance/time = 100/5 = 20 m/s.
Q19. Motion of a ceiling fan is an example of:
β Correct: B β A ceiling fan shows rotatory motion about a fixed axis.
Q20. The slope of a distance-time graph gives:
β Correct: B β Slope (rise/run) of distance-time graph equals speed.