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- Question
Sound travels at the fastest speed in
Options- A. steel
- B. water
- C. air
- D. vacuum
- Correct Answer
- steel
- 1. What do eukaryotic cells have that prokaryotic cells do not?
Options- A. Nucleus
- B. Cytoplasm
- C. Ribosomes
- D. DNA Discuss
- 2. The later (second) formed primary xylem elements are called _____________.
Options- A. Protoxylem
- B. Metaxylem
- C. Xylem parenchyma
- D. Xylem fibres Discuss
- 3. Cathode rays are
Options- A. electromagnetic wave
- B. stream of alpha particle
- C. stream of electrons
- D. radiations Discuss
- 4. Calcium salts used as fertilizer is:
Options- A. Calcium Carbide
- B. Calcium Carbonate
- C. Calcium Cyanide
- D. Calcium Sulphate Discuss
- 5. What is dry ice?
Options- A. Solid Carbon dioxide
- B. Solid Nitrogen dioxide
- C. Solid Sulphur dioxide
- D. Solid Water Discuss
- 6. Order of basicity of amines Discuss
- 7. The universal donor belongs to blood group
Options- A. A
- B. B
- C. AB
- D. O Discuss
- 8. There are how many vocal cords in the human voice box?
Options- A. One
- B. Two
- C. Three
- D. Four Discuss
- 9. Natural radioactivity was discovered by
Options- A. Rutherford
- B. Becquerel
- C. Curie
- D. Schmidt Discuss
- 10. Which one of the following forms of phosphorus is most reactive?
Options- A. Black phosphorus
- B. White phosphorus
- C. Violet phosphorus
- D. Red phosphorus Discuss
More questions
Correct Answer: Nucleus
Correct Answer: Metaxylem
Correct Answer: stream of electrons
Correct Answer: Calcium Sulphate
Correct Answer: Solid Carbon dioxide
Correct Answer: The order of basicity for primary, secondary and tertiary amines are: Secondary > Primary > Tertiary > NH3 * Amines are basic in nature as they have lone pair of electrons on nitrogen Therefore, they have a strong tendency to donate this lone pair of electrons to electron acceptors * The stability of conjugate acids formed is dependent on the extent of H-bonding,and greater the number of H-atoms on N more stable is the conjugate acid * The conjugate acid of primary amine is the most stable with greater number (3) of H-bonds than > Secondary > tertiary But primary amines are less basic than secondary as the electron density on the N atom is less and lone pair of electrons are not readily available for protonation * The two opposing factors ie the stability of conjugate acids formed and ease of availability of electrons for Protonation, balance each other in case of secondary amines and it is most basic
Correct Answer: O
Explanation:
The persons with 'O' blood group do not have antigens in the red corpuscles. So that blood will not cause agglutination of corpuscles if mixed with any type of blood. So group 'O' persons are called universal donors.
Correct Answer: Two
Correct Answer: Becquerel
Correct Answer: White phosphorus
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