General Science-23

1. Which one of following vitamins can be synthesized by human body?
a. Vitamin B1
b. Vitamin B12
c. Vitamin C
d. Vitamin D

2. What is the process responsible for producing photons in a diode laser?
a. Fermi level shift
b. Majority carrier injection
c. Carrier freeze out
d. Electron-hole recombination

3. Which variety of coal contains the highest percentage of carbon?
a. Anthracite
b. Peat
c. Bituminous
d. Lignite

4. What is the main component of biogas and natural gas?
a. Ethane
b. Methane
c. Propane
d. Butane

5. What is dry ice?
a. Liquid nitrogen
b. Water ice
c. Solid carbon dioxide
d. Frozen ethanol

6. Nail polish remover contains mainly:
a. Methanol
b. Ethanol
c. Acetone
d. Limonene

7. Which of the following measurements is not a unit of distance?
a. Ammeter
b. Cubit
c. Parsec
d. Angstrom

8. Who discovered X-rays?
a. Land
b. Roentgen
c. Eastman
d. Kodak

9. What is defined as the change in velocity over time?
a. Acceleration
b. Speed
c. Work
d. Force

10. Which one of the following is caused by virus:
a. Cholera
b. Influenza
c. Scabies
d. Typhoid