Science Quiz: Day 125

October 17, 2022

Which one of the following is not a semiconductor?

(A) Silicon
(B) Germanium
(C) Quartz
(D) Gallium arsenide

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Answer – C

Which one of the following is a physical change?

(A) Burning of coal
(B) Burning of wood
(C) Heating of a platinum crucible
(D) Heating of potassium chlorate

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Answer – C

Heating of platinum crucible is a physical change as in this process formation of new substance do not take place and the change is reversible. Physical change is the change from one phase of matter (solid, liquid, or gas) to another and the substance is not altered

The pH value of a sample of multiple-distilled water is -

(A) Zero
(B) 14
(C) Very near to zero
(D) Very near to seven

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Answer – D

Which one of the following is the most characteristic property of an element ?

(A) Density
(B) Boiling point
(C) Mass number
(D) Atomic number

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Answer – D

There are two elements--calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as :

(A) Isotones
(B) Isochores
(C) Isobars
(D) Isotopes

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Answer – C

Plum Pudding Model - for an atom was proposed by :

(A) Antoine Lavoisier
(B) Robert Boyle
(C) Ernest Rutherford
(D) J. J. Thomson

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Answer – D

The chemical properties of an element depend upon :

(A) The number of isotopes of the element
(B) The mass number of the element
(C) The total number of neutrons in the element
(D) The number of electrons in the outermost shell of the element

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Answer – D

The paste of a white material in water is used to maintain a fractured bone fixed in place. The white material used is called :

(A) Bleaching powder
(B) Plaster of Paris
(C) Powder of zinc oxide
(D) Lime powder

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Answer – B

Which one of the following types of glasses is used for making optical instruments?

(A) Pyrex glass
(B) Soft glass
(C) Hard glass
(D) Flint glass

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Answer – D

What are the main constituents of biogas ?

(A) Methane and sulphur dioxide
(B) Methane and carbon dioxide
(C) Methane, hydrogen and nitric oxide
(D) Methane and nitric acid

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Answer – B