651. Which among the following is used in preparing windows for X-Ray Tubes ?
A. Barium
B. Beryllium
C. Magnesium
D. Calcium
✅ The correct answer is option B.
SSC
652. Which among the following compound of barium is used as radio contrast agent for X-ray imaging and other diagnostic procedures and also commonly called as Barium Food?
A. Barium Carbonate
B. Barium Sulphate
C. Barium Bromide
D. Barium hydroxide
✅ The correct answer is option B.
653. Which among the following can be used as a preservative in Tomato Juice?
A. Sodium Chloride
B. Sodium carbonate
C. Sodium benzoate
D. Sodium Lauril Sulphate
✅ The correct answer is option C.
654. Mizoroki-Heck reaction is catalyzed by which of the following metals?
A. Rhodium
B. Sodium
C. Palladium
D. Osmium
✅ The correct answer is option C.
655. Which among the following is a main component of some alert tablets such as Alert, No Doz, Stay Awake & Vivarin?
A. Thein
B. Caffeine
C. Nicotine
D. catechins
✅ The correct answer is option B.
656. Which among the following is the main constituent of vegetable oil and animal fats?
A. Glycogen
B. Triglyceride
C. Galactose
D. Diglyceride
✅ The correct answer is option B.
657. Which among the following acid is used to ascertain, whether pure Ghee has been adulterated with Vanaspati or Margarine?
A. Sulphuric Acid
B. Nitric Acid
C. Hydrochloric Acid
D. Boric Acid
✅ The correct answer is option C.
658. Who among the following established that genetic code of all organisms is spelled out in three-letter words, each set of three nucleotides codes for a specific amino acid?
A. Hargobind Khorana
B. Barbara McClintock
C. Theodor O. Diener
D. Joseph L. Goldstein
✅ The correct answer is option A.
659. What is Carbamide?
A. A Pesticide
B. A Fertilizer
C. A Textile Dye
D. An Explosive
✅ The correct answer is option B.
660. When a piece of quicklime is dipped in water, it gives bubbles. This bubbling is due to which of the following?
A. Oxygen
B. Carbon Dioxide
C. Water Vapour
D. Hydrogen
✅ The correct answer is option C.