Question 1 :
Choose the correct option.<br>The process by which water vapour changes to water is called ___________.
Question 2 :
Choose the correct option.<br>The process of adding chlorine in water to kill germs is called ___________.
Question 3 :
Choose the correct option.<br>The first layer of atmosphere is the ___________.
Question 5 :
Choose the correct option.<br>The process of removing the clear water after the sediments settle down is called ____________.
Question 7 :
Choose the correct option.<br>Dirty water from homes and factories does not contain detergents and soap.
Question 8 :
Choose the correct option.<br>The process of making air clean is called air pollution.
Question 9 :
Choose the correct option.<br>Which of the following helps to produce biogas?
Question 10 :
Click and choose the correct answer.<br>Rain water harvesting is an expensive way of preserving water.
Question 11 :
Choose the correct option. <br>A sewing machine does not have a wheel-and-axle arrangement.
Question 12 :
Choose the correct option. <br>A wedge is a type of modified inclined plane.
Question 13 :
Choose the correct option. <br>A lever is a strong rod that can turn or move around a fixed point or support.
Question 14 :
Choose the correct option.<br>A car jack is operated by a pulley.
Question 15 :
Choose the correct option.<br>Fishing rods are an example of ________ lever.
Question 16 :
Choose the correct option.<br>Machines such as cars and sewing machines have wheel-and-axle arrangement.
Question 17 :
Click on True or False.<br>A ________ makes work easier by changing the direction of the force.
Question 18 :
Choose the correct option.<br>A lever is a strong rod that can turn or move around a fixed point or support.
Question 19 :
Choose the correct option. <br>A pulley is a small wheel which rotates freely about an axle passing through its centre.
Question 20 :
Choose the correct option.<br>A pulley used for drawing water from a well is a fixed pulley.
Question 21 :
Choose the correct option.<br>A ________ is a type of modified inclined plane.
Question 22 :
Choose the correct option. <br>There are two types of pulleys—fixed and movable.
Question 24 :
Choose the correct option.<br>A__________ is a small wheel which rotates freely about an axle passing through its centre.
Question 25 :
Click on True or False.<br>A road up a hill is an example of ________.
Question 27 :
What can one do to the fulcrum to reduce the amount of effort needed to lift something using a fi rst class lever.
Question 29 :
Which of these is an example of using a simple machine to work?
Question 30 :
Choose the correct option.<br>When the fulcrum is located between the load and effort, it is a ________ lever.
Question 34 :
Which of the following best explains why lifting a heavy object with a single fixed pulley and rope makes the task easier?