Q. Which of the following acids is found in nettle sting?

A. অ্যাসিটিক অ্যাসিড
B. সাইট্রিক অ্যাসিড
C. মিথেনয়িক অ্যাসিড
D. অক্সালিক অ্যাসিড

Q. When was the electron discovered?

A. 1895
B. 1898
C. 1896
D. 1897

Q. Candela is the SI unit of which of the following base quantities?

A. Temperature
B. Length
C. Mass
D. Luminous intensity

Q. The pH of soil can be raised by adding ______

A. concrete
B. limestone
C. sand
D. urea

Q. Ringworm is a common skin infection caused by:

A. protozoa
B. fungus
C. bacteria
D. virus