Which of the following protects the body against infectious disease and foreign invaders?

A. Leukocytes
B. Red blood cells
C. Endoplasmic reticulum (er)
D. Golgi apparatus

Which of the following is commonly called a polyamide ?

A. Rayon
B. Nylon
C. Terylene
D. Orion

Which of the following is used in beauty parlours for hair setting?

A. Silicon
B. Chlorine
C. Sulphur
D. Phosphorus

Which one of the following non-metals is not a poor conductor of electricity?

A. Sulphur
B. Selenium
C. Bromine
D. Phosphorus

Eletromagneticism is the branch of___________?

A. Chemistry
B. Physics
C. Both
D. None of these

Second name of ethyl alcohol is___________?

A. Ethene
B. Ethanol
C. Propyle
D. None

Transistor is a device that convert weak signal into__________?

A. Small signal
B. Strong signal
C. Both
D. None

Dioptre is a unit of measurement for __________ ?

A. Current
B. Lens
C. Force
D. Focal length

Which of the following is a force?

A. Heat
B. Light
C. Magnetism
D. Kinetic

Which among the following types of lenses are prescribed by doctors for a patient suffering from astigmatism?

A. Cylindrical lens
B. Concave lens
C. Spherical lens
D. Convex lens