Which of the following keeps the circulation of blood in the body?
A. Skeletal system B. Nervous system C. Cardiovascular system D. All
Which of the following is not a conductor?
A. Copper B. Glass C. Silver D. Aluminum
Which of the following convert chemical energy into electrical energy?
A. Generator B. Motor C. Battery D. Moving-Coil meter
Which of the following is not the part of the Solar system?
A. A Constellation B. A satellite C. An asteroid D. A comet