General Science #34 Multiple Choice Questions (MCQ) : Assam Jobs Guide

GENERAL SCIENCE #34

MULTIPLE CHOICE QUESTIONS

General Science : Multiple Choice Questions (MCQ) : Assam Jobs Guide

1. What is the chemical symbol for nitrogen gas?

(a) Ni

(b) N2

(c) N+

(d) N

Answer: (b)

2. What is the chemical symbol for sodium?

(a) So

(b) Sd

(c) NA

(d) Na

Answer: (d)

3. Which of the following would weigh the highest?

(a) 0.2 mole of sucrose (C12H22O11)

(b) 2 moles of CO2

(c) 2 moles of CaCO3

(d) 10 moles of H2O

Answer: (c)

4. Which of the following has maximum number of atoms?

(a) 18 g of H2O

(b) 18 g of O2

(c) 18 g of CO2

(d) 18 g of CO4

Answer: (d)

5. Which of the following correctly represents 360 g of water?

(i) 2 moles of H2O

(ii) 20 moles of water

(iii) 6.022 × 1023 molecules of water

(iv) 1.2044 × 1025 molecules of water

(a) (i)

(b) (i) and (iv)

(c) (ii) and (iii)

(d) (ii) and (iv)

Answer: (d)

6. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The number of oxygen atoms in the solution are ……………

(a) 6.68 × 1023

(b) 6.09 × 1022

(c) 6.022 × 1023

(d) 6.022 × 1021

Answer: (a)

7. A change in the physical state can be brought about ……………

(a) only when energy is given to the system

(b) only when energy is taken out from the system

(c) when energy is either given to, or taken out from the system

(d) without any energy change

Answer: (c)

8. What is the relative molecular mass of Na2S2O3.5H2O?

(a) 250 amu

(b) 250 g

(c) 248 amu

(d) 248 g

Answer: (c)

9. Which of the following has maximum number of atom?

(a) 18 g H2O

(b) 18 g of O2

(c) 18 g of CO2

(d) 18 g of CH4

Answer: (d)

10. What is the percentage of calcium in calcium carbonate?

(a) 40%

(b) 30%

(c) 48%

(d) 36%

Answer: (a)

11. Which has maximum number of molecules?

(a) 1 g of CO2

(b) 1 g of N2

(c) 1 g of H2

(d 1 g of CH4

Answer: (c)

12. What mass of carbon dioxide (CO2) will contain 3.011 × 1023 molecules?

(a) 11.0 g

(b) 22.0 g

(c) 4.4 g

(d) 44.0 g

Answer: (b)

13. What is the value of Avogadro’s constant?

(a) 6.0 × 1024

(b) 6.01 × 1022

(c) 6.022 × 1023

(d) 6.022 × 10-23

Answer: (c)

14. How many times an atom of sulphur is heavier than an atom of carbon?

(a) 32 times

(b) 12 times

(c) 8/3 times

(d) 12/32 times

Answer: (c)

15. The number of oxygen atoms in 4.4 g of CO2 is approx. ……………

(a) 6 × 1022

(b) 6

(c) 12 × 1023

(d) 1.2 × 1023

Answer: (d)

16. Which of the following represents 12 u?

(a) Mass of 1 hydrogen atom

(b) Mass of C-12 atom

(c) Mass of 0-16 atom

(d) 1/12th of mass of C-12 atom

Answer: (d)

17. Which of the following would weigh the highest?

(a) 0.2 mole of sucrose (C12H22O11)

(b) 2 moles of CO2

(c) 2 moles of CaCO3

(d) 10 moles of H2O

Answer: (c)

18. The molecule having an atomicity of 4 is ……………

(a) sulphate molecule

(b) ozone molecule

(c) phosphorus molecule

(d) methane molecule

Answer: (c)

19. One gram of which of the following contains largest number of oxygen atoms?

(a) O

(b) O2

(c) O3

(d) All contain the same

Answer: (c)

20. Which of the following has the largest number of particles?

(a) 2g of H2

(b) 4.4g of CO2

(c) 8g of CH4

(d) 34.2g of C12H22O11

Answer: (a)

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