Physics-Objective Related Question Answers
826. The SI Unit of?
Work - joule power - watt energy - joule
827. Energy of one form can be changed to another form. The process is called?
Energy Transformation
828. What is the potential energy of a body on the ground?
Zero
829. Which is the main source of energy to earth?
Sun
830. In the sun, which is converted into energy?
Matter
831. What is called a device which reduces human effort?
Machine
832. What is called the ratio of the resistance to the effort when they balance each other?
Mechanical advantage of a simple machine
833. What is called ‘lever’?
A rigid rod which can rotate about a point fulcrum is called a lever.
834. What is first order lever?
In first order lever Fulcrum is between the resistance and effort.
835. Write some examples of the first order levers:?
Balance; scissors; spanner
836. What is second order lever?
In second order lever resistance lies between the Fulcrum and effort
837. Write examples of second order lever?
Nut cracker; Wheel barrow; Bottle opener Who proved the existence of seven colours in sunlight?
838. What do you mean by the third order lever?
The effort is in between the resistance and the fulcrum
839. Write examples of third order lever?
Fire tongs; forceps; ice tongs
840. What changes is done in a dynamo?
Mechanical energy is converted into electrical energy.
841. What is the unit of work in the C.G.S. system?
Erg
842. When a body falls freely work is done by?
Gravitational force
843. One watt is equal to?
One Joule / second
844. “State the law of conservation of energy”:?
Energy can neither be created nor destroyed although it can be transformed from one form to another
845. When is work always done on a body?
When it experience an increase in energy through a mechanical influence
846. The unit of Speed and Velocity is?
m/sec
847. The unit of acceleration?
metre/sec²
848. A quantity which possess only magnitude is called a?
scalar quantity
849. Distance, Mass, Temperature, Time etc. are examples of which quantity?
Scalar quantity
850. A quantity which possess both magnitude and direction is known as?
Vector quantity
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