General Science Chemistry MCQs
Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
11. Kimberley Process” is related to which among the following ?
[A] Gold
[B] Diamonds
[C] Semi Precious Stones
[D] Aluminium
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Correct Answer: B [Diamonds]
12. Which among the following minerals is also known as Horn Silver?
[A] Silver Iodide
[B] Silver Chroride
[C] Zinc Phosphate
[D] Silver Sulphide
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Correct Answer: B [Silver Chroride]
13. What is the dimensional formula of Stress?
[A] M 1 L-2 T-2
[B] M 1 L-1 T-1
[C] M 1 L1 T-3
[D] M 1 L-1 T-2
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Correct Answer: D [M 1 L-1 T-2]
Notes:
Stress is defined as external force per unit area on a body that tends to cause it to deform. The dimensional formula of Stress is M 1 L-1 T-2
14. What do we call the strain produced in a body when the deforming force produces a change in its shape without changing its volume?
[A] Linear Strain
[B] Volumetric Strain
[C] Shearing strain
[D] Thermal Strain
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Correct Answer: C [Shearing strain]
Notes:
When the deforming force produces a change in the shape of the body without changing its volume, the strain produced is called shearing strain.
15. What is the ratio of normal stress to the volumetric strain within the elastic limits is called as?
[A] Bulk Modulus
[B] Young Modulus
[C] Modulus of Rigidity
[D] None of the above
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Correct Answer: A [Bulk Modulus]
Notes:
The ratio of normal stress to the volumetric strain within the elastic limits is called as Bulk modulus. It is denoted by K.
16. Which of the following statements about alkali metals is correct?
[A] lithium is the most powerful reducing agent
[B] Sodium is the least powerful reducing agent
[C] Both a and b
[D] None
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Correct Answer: C [Both a and b]
Notes:
Lithium is least reactive but the strongest reducing agent among all the alkali metals.
17. How many groups of p–block elements are there in the periodic table?
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Correct Answer: B [6]
Notes:
There are six groups of p–block elements in the periodic table numbering from 13 to 18.
18. Which of the following is correct about Acetylene?
[A] It is the popular name of ethyne
[B] It is the first stable member of alkyne series
[C] Both a and b
[D] None
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Correct Answer: C [Both a and b]
Notes:
The first stable member of the alkyne series is ethyne and is popularly known as acetylene. Acetylene is used for arc welding purposes in the form of oxyacetylene flame.
19. Which of the following represents the general formula for alkanes?
[A] CnH2n
[B] CnH2n-2
[C] CnH2n+2
[D] CnHn
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Correct Answer: C [CnH2n+2]
Notes:
Alkanes are saturated open chain hydrocarbons containing carbon – carbon single bonds.
20. Which of the following elements have a compound named as Hydrogen peroxide?
[A] Hydrogen, Carbon and Oxygen
[B] Hydrogen only
[C] Hydrogen and Oxygen
[D] Hydrogen, Oxygen and Potassium
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Correct Answer: C [Hydrogen and Oxygen]
Notes:
Hydrogen peroxide is a compound of Hydrogen and Oxygen.
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