CBSE Class 9 c9powermachines — practice questions
12 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 9 c9powermachines in the app →Per NCERT Class 9 Science, POWER is defined as which quantity?Per NCERT, what is the SI unit of POWER?Per NCERT, after whom is the SI unit of POWER (watt) named?Per NCERT, 1 HORSEPOWER (hp) is approximately equal to how many watts?Per NCERT Example 7.10, a weightlifter lifts a 75 kg mass by 2 m in 5 seconds (taking g = 10 m/s²). What POWERPer NCERT, a SIMPLE MACHINE — like a pulley, inclined plane, or lever — does which of the following?Per NCERT, what is MECHANICAL ADVANTAGE (MA) of a simple machine?Per NCERT, what is the mechanical advantage of a FIXED PULLEY?Per NCERT, what is the primary BENEFIT of a fixed pulley if it doesn't reduce the effort force?Per NCERT, the MECHANICAL ADVANTAGE of an INCLINED PLANE of length L and height h is which expression?Per NCERT Example 7.12, a ramp raises a load over a 30 cm step and has a horizontal width of 40 cm. What is itPer NCERT, a LEVER consists of three parts. Which is NOT one of them?