Maths Group11

Which one of the following is NOT true about pulley systems?

A 200N force is required to be applied at one end of 1m long lever. If the distance from the effort to fulcrum is 80cm, inorder to lift a load of 600N placed at the other end. What is the efficiency of the lever?

If the efficiency of one machine is 100%, then which one of the following is not true?

If we want to increase an efficiency of one machine, we have to increase:

Which one of the following statement is true about simple machines?

Which one of the following statement is true about the classes of lever in simple machines?

If an inclined plane of 4m length and 1m height has an efficiency of 0.5, what is its mechanical advantage?

A screw shaft has a diameter of 4cm and its adjacent threads are 0.314cm apart. What is the velocity ratio of the screw?

A 10cm long and 2cm wide metal wedge is used to split a wood. What is the velocity ratio of the wedge?

Which simple machine can not be used to increase force?

An effort is 200N is applied on to a wedge of 4cm thick and 12cm long to split a log of 500N into parts. Then what is the efficiency of the wedge?

A simple machine has an efficiency of 0.75 and velocity ratio 12. Then what is the load that can be moved if an effort of 100N is applied?

A simple machine is able to move a 400N load a distance of 20cm when a force of 20N is moved the distance of 5m, then what is the actual mechanical advantage and the efficiency of the machine ?

Before she reached to us, we ____________ her for a long time.

The book ____________ by our teacher a year ago.

He enjoys _________ to music everyday.