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ICSE Class 10 Force and Machines — practice questions — page 2

Explore 167 free Force and Machines questions in ICSE Class 10 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Force and Machines questions and exercises with answers

Showing questions 31–60 of 167.

Single movable pulley has ideal mechanical advantage of:Read the answer and worked solution →Efficiency of an ideal machine is:Read the answer and worked solution →Which simple machine multiplies SPEED rather than force?Read the answer and worked solution →In a block and tackle pulley system with n supporting strings, the ideal mechanical advantage is:Read the answer and worked solution →A load of 100 N is lifted by an effort of 25 N. Mechanical advantage is:Read the answer and worked solution →A pulley system has V.R. = 5 and M.A. = 4. Its efficiency is:Read the answer and worked solution →In a real machine, is M.A. always equal to V.R.?Read the answer and worked solution →An inclined plane of length 10 m and height 2 m has velocity ratio:Read the answer and worked solution →A force multiplier is a machine whose:Read the answer and worked solution →A pulley arrangement has 3 movable and 1 fixed pulley. Ideal V.R. is:Read the answer and worked solution →In a Class I lever the effort arm is 60 cm and the load arm is 20 cm. Mechanical advantage is:Read the answer and worked solution →If a 200 N load is lifted 0.5 m using a 50 N effort moving 2 m, find efficiency:Read the answer and worked solution →A boy can apply effort of 100 N. If he wants to lift a 400 N load, the M.A. of the machine he needs is at least:Read the answer and worked solution →Which of the following has M.A. of 1?Read the answer and worked solution →A force multiplier always has:Read the answer and worked solution →In an ideal block and tackle with 5 strings supporting the load, the effort needed to lift 1000 N is:Read the answer and worked solution →Why does increasing the length of an inclined plane reduce effort?Read the answer and worked solution →What is torque the rotational counterpart of?Read the answer and worked solution →Which other name is used for torque?Read the answer and worked solution →Which symbol commonly represents torque?Read the answer and worked solution →What does torque tend to make a body do?Read the answer and worked solution →Which force component determines torque magnitude?Read the answer and worked solution →From what point is a lever arm distance measured?Read the answer and worked solution →How should a torque value be written in SI?Read the answer and worked solution →Which force direction produces no torque about a point?Read the answer and worked solution →How is the torque of several forces combined about a point?Read the answer and worked solution →What is the moment of force often shortened to?Read the answer and worked solution →What does statics analyse?Read the answer and worked solution →For a particle to be in equilibrium, what must its resultant force be?Read the answer and worked solution →What two totals must vanish for a body in static equilibrium?Read the answer and worked solution →

Worked practice questions

Single movable pulley has ideal mechanical advantage of:

  1. 1
  2. 3
  3. 2
  4. 4
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Correct answer: C. 2

1. The load hangs from the movable pulley. 2. Two strings support the load. 3. Each string carries half the load. 4. So the effort is half the load and M.A. = 2. _Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_

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Efficiency of an ideal machine is:

  1. More than 100 percent
  2. 50 percent
  3. 0 percent
  4. 100 percent
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Correct answer: D. 100 percent

1. Ideal machines have no friction or weight of parts. 2. All input work becomes useful output. 3. So efficiency equals 100 percent for an ideal machine. 4. Real machines have efficiency below 100 percent. _Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_

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Which simple machine multiplies SPEED rather than force?

  1. Class III lever
  2. Class II lever
  3. Block and tackle
  4. Single movable pulley
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Correct answer: A. Class III lever

1. Class III levers have M.A. less than 1. 2. Effort must be larger than load. 3. But the load moves a larger distance than the effort. 4. This means a small movement of effort gives a large motion of load. 5. So Class III levers are speed multipliers, not force multipliers. _Source: Selina Concise Physics ICSE Class 10, Ch 3 'Machines' (aplustopper.com extract)_

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