381. Dry ice is ___________?
A. Methane hydrate
B. Liquid Nitrogen
C. Solid Carbon dioxide
D. Frozen Water
E. None of these

382. Chemical name of vinegar is _____________?
A. Sodium Nitrate
B. Dilute acetic acid
C. Chloride of lime
D. Calcium
E. None of these

383. Deficiency of following vitamin decreases hemoglobin production ?
A. Biotin
B. Thiamine
C. Niacin
D. Pyridoxine
E. None of these

384. Hygrometer is used for measuring the ____________?
A. Speed of sound
B. Density of milk
C. Humidity of air
D. Specific gravity of liquids
E. None of these

385. Bronze is an alloy of ____________?
A. Copper and Zinc
B. Tin and Zinc
C. Copper and Tin
D. Iron and Zinc
E. None of these

386. Which of the following is most elastic ?
A. Steel
B. Rubber
C. Glass
D. Sponge
E. None of these

387. Orbital period of the planet Mercury around the sun is _____________?
A. 88 days
B. 365 days
C. 2 years
D. 98 days
E. None of these

388. The most splendid and the most magnificent constellation on the sky is?
A. Orion
B. Columbia
C. Canis Major
D. Taurus
E. None of these

389. Eugenics is the study of___________________?
A. Altering human beings by changing their genetic components
B. People of European region
C. Different races of mankind
D. Genetic of plants
E. None of these

390. The position of earth in its orbit, when it is at its greatest distance from the sun causing northern summer is called ___________?
A. Aphelion
B. Perihelion
C. Perigee
D. Apogee
E. None of these