Q1.The process of nuclear fusion in the sun requires
(a) very high temperature and very high pressure
(b) low temperature and high pressure
(c) high temperature and low pressure
(d) very high temperature and no pressureQ2. At NTP, the least volume will be occupied by 15 g of which one of the following?
(d) Ne Q3. In which one of the following is the valence electronic configuration, ns2np3 found?
(d) Argon Q4. Which one of the following is not a mixture?
(d) CementQ5. Which one among the following is the most appropriate statement with respect to the atomic weight of an element?
(a) The atomic weight of an element is the sum total of the number of protons and neutrons present in the atom of the element
(b) Unlike mass number, the atomic weight of an element can be a fraction
(c) The atomic weight of an element is a whole number
(d) The atomic weight of all the atoms in an element is the sameQ6. It is an allotrope of silicon.
2. It is a bad conductor of heat and electricity.
3. It is the hardest substance.
4. It burns to produce carbon dioxide.
Which of the statements given above are correct?
(a) 1, 2, 3 and 4
(b) 2, 3, and 4
(c) 1 and 2
(d) 1, 3 and 4Q7. DIRECTIONS : The following questions consist of two statements, one labelled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
Assertion (A): Carbon dioxide is a compound
Reason (R): Carbon and Oxygen combine together in the ratio 3: 8 by mass.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is trueQ8. Oxygen and ozone are
(d) isobarsQ9. A mixture containing SiO2, NaCl and NH4Cl is taken for separating the constituents. The suitable steps required for this are
(d) Dissolution-distillation-decomposition-evaporation.Q10. Which one among the following is the major constituent of soda lime glass?
(a) Sodium oxide
(b) Calcium oxide
(c) Calcium carbonate
(d) SilicaQ11. Which one of the following acids is used for etching glass?
(d) HCl Q12. Which one of the following glasses is used in bullet proof screens?
(a) Soda glass
(b) Pyrex glass
(c) Jena glass
(d) Reinforced glass
1. (a)2. (b)3. (c)4. (b)5. (b)6. (a)7. 8. (a)9. (a)10. (d)11. (c)12. (d)