16. Which of the following is a form of ‘calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells
- A. I only
- B. I, II and IV
- C. I and II only
- D. I, II, III, and IV
17. Soaps clean surfaces on the principle based on?
- A. viscosity
- B. floatation
- C. elasticity
- D. surface tension
18. The reactivity of fluorine is due to?
- A. its high electro negativity
- B. small size of fluorine atom
- C. availability of D-orbitals
- D. strong f-f bond
19. The mass number of a nucleus is?
- A. Always less than its atomic number
- B. The sum of the number of protons and neutrons present in the nucleus
- C. Always more than the atomic weight
- D. A fraction
20. The mass of one Avogadro number of helium atoms is?
- A. 1.00gram
- B. 4.00gram
- C. 8.00gram
- D. 6.00gram
21. 220g of carbon dioxide contains —– moles
- A. 5
- B. 6
- C. 3
- D. 4
22. The inherited traits of an organism are controlled by?
- A. RNA molecules
- B. Nucleotides
- C. DNA molecules
- D. Enzymes
23. The most abundant rare gas in the atmosphere is?
- A. He
- B. Ne
- C. Ar
- D. Xe
24. The heat required to raise the temperature of the body by 1k is called?
- A. Specific heat
- B. Thermal capacity
- C. Water equivalent
- D. None of the above
25. The nucleus of a hydrogen neutron atom consists of a?
- A. 1 proton only
- B. 1 proton, 2 neutron
- C. 1 neutron only
- D. 1 electron only
26. The metal used to recover copper from a solution of copper sulphate is?
- A. Na
- B. Ag
- C. Hg
- D. Fe
27. The nucleus of an atom consists of?
- A. Electrons and neutrons
- B. Electrons and protons
- C. Protons and neutrons
- D. None of the above
28. A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage
- A. 11.%
- B. 22.2%
- C. 10%
- D. 20%
29. The only metal that is anti-bacterial is?
- A. Iron
- B. Sodium
- C. Alluminium
- D. Copper
30. An element having the atomic number 17 will resemble which of the following elements having atomic number as given below?
- A. 33
- B. 35
- C. 18
- D. 19
