Machine 10th Physics

The force applied on the machine to overcome the load is called ______

• Load

• Effort

• M. A

The Work done by the machine on the load , is called work ______

• Input

• Output

• Power

Calculate the ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm

• 240

• 60

• 10

• 15

Define the term 'Power' in the context of machines.

• Input work done by the machine

• Output work done by the machine

• Rate at which work is done

A crowbar 2m long is pivoted about a point 20 cm from its tip. Calculate the M. A of the Crowbar

• 19

• 9

• 10

• 40

From the Given Diagram (a) What kind of pulleys are A & B

(b) State the purpose of pulley B

(c) What effort has to be applied at C to just raise the load of 20 kgf

• (a) A is fixed and B is Movable

  (b) so as change direction at convenience

  (c) E = 10 kgf

• (a) A is Movable and B is Fixed

  (b) so as force multiplier

  (c) E = 15 kgf

• (a) A is Movable and B is Fixed

  (b) so as change direction at convenience

  (c) E = 10 kgf

In a single movable pulley system, a load of 125 kgf is lifted by an effort of 75 kgf. Find the percentage efficiency of system.

• 83.30 %

• 83. 83.20 %

• 83.40%

• 80.19%

An effort of 10 kgf is applied on a machine through a distance of 40 cm, when a load of 50 kgf moves through a distance of 4 cm, Calculate (a) V.R (b) M.A (c) Percentage Efficiency

• (a) V.R = 10

  (b) M. A = 10

  (c) 40 %

• 83. (a) V.R = 20

      (b) M. A = 5

      (c) 40 %

• (a) V.R = 5

  (b) M. A = 5

  (c) 50 %

• (a) V.R = 10

  (b) M. A = 5

  (c) 50 %

Imagine there are block & tackle system of 3 pulleys in which the direction of Effort is vertically upward, How many pulleys will be there in Upper Block System?

• 3 Pulleys

• 2 Pulleys

• 1 Pulley

• Non of these

Identify the kind of Lever

• Class I Lever

• Class II Lever

• Class III Lever