Environmental Scienc ...

Q1.

State True (T) or false (F).

a.

b.

c.

d.

e.

     f.

A fixed pulley acts as a second class lever. ___________

A lever’s balance point is called its fulcrum. _________

Simple machines are the most complex machines that we use daily to make work easier.___________

An inclined plane helps a person to move or raise heavy objects._______

Wheelbarrow is an example of Class – II Lever. ___________

The wheel and axle is a first class lever.___________

Q2.

Fill in the blanks.

a.

b.

c.

d.

     e.

f.

A car jack is an example of ____________________ lever.

A person using a hockey stick is an example of ________________ lever.

A __________ is an inclined plane that goes round and round.

A wheel and _____________ together act as a simple machine.

____________ are devices, which help us to do a great deal of work with less effort.

A lever’s balance point is called its ______________.

Q3.

Match the following.

Ramps for wheel chairs

Wheel and Axle

An inclined plane wrapped around a cylinder

Second class levers

A windmill

Inclined plane

A pair of nutcrackers

Screw

Lifts the automobile with less effort

Jack

Answer the following:

What is a machine?

___________________________________________________________

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Compare a screw and a nail.

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Give an example of natural inclined plane.

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List any 3 simple machines you use in your daily life.

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Write at least 3 examples for each of the following:

Class – I Lever  ______________________________________________

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Class – II Lever ______________________________________________

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Class – III Lever  _____________________________________________

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   Answer in one word.

     a)   A long plank or pole is used to lift a large load. _________________

     b)   One example of wheel and axle. __________________

     c)   A device, which help us to do a great deal of work with less effort.

   ________________

     d)   A pulley which is fixed firmly attached to one spot, and does not move around._________________

     e)   Fulcrum is in the middle between the load and effort. _______________

     f)    The wheel and axle is a first class lever.___________

   Answer the following questions:

    a)   A pulley is what class of lever? Explain.

________________________________________________________

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    b)   What is an inclined plane? How does it help workers loading heavy objects in a truck?

________________________________________________________

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    c)   Why vehicles in plains move easier and faster compared to hilly areas?

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