ENERGY (CLASS10) SCIENCE

The capacity of doing work is known as :     

•   (a) Force.         

• (b) Work.        

•   (c) Energy.          

•   (d) Power.

One erg is equal to:      

• (a) 10^-7 Joule.

•  (b)  10^-5 Joule.       

•  (c) 10^-3Joule.             

•    (d) 10^-1 Joule.

Which one  can also use to calculate the kinetic energy of a body?    

Which one is different among them?      

•  (a)   mc²     

• (b)   hdg.      

•  (c) 1/2mv²           

• (d) mgh

How much energy is in  one kg of mass according to E= mc²?             

•  (a) 9×10¹⁰ J.       

• (b)  9×10¹⁵ J.            

• (c) 9×10¹⁶ J.           

•  (d) 9×10²⁰ J.    

The energy created due to the continuous flow of electrons  is known as :       

•  (a) Heat energy.        

•   (b) Tidal energy.    

•    (c) Light energy        

•    (d) Electrical energy. 

Which of the  following is the right statement for “law of conservation of energy”?          

• (a) Energy can produce and reduce.           

•    (b) Energy can produce and destroyed .  

           

• (c) The sum of total energy always remain constant.         

•    (d) All are right.   

What is the name of device which change electric energy into heat energy?         

• (a)  Fan.       

• (b) Electric iron.       

•  (c) Washing machine.     

• (d) Computer.

Which type of energy stored in a coal of the following ?        

•   (a) kinetic energy        

•   (b) potential energy      

•   (c)  chemical energy    

•   (d) nuclear energy

Which of the following is the right formula ?